Gabriel announced for PTO2020

The decision on one of the most important weapon systems for the Finnish Navy has become public today with the surprise announcement that Israeli Aircraft Industries’ Gabriel has been chosen for the PTO 2020-contract. The PTO 2020 will be the main ship-killing weapon of the Navy, being used on the Hamina-class FAC and the Pohjanmaa-class corvettes (Squadron 2020) as well as from truck-mounted batteries ashore. As such, it will replace the current MTO 85M (the RBS15 SFIII, a customised RBS15 MkII). This also effectively kills alls speculation that there would be a joint anti-shipping weapon operated by the Navy and by the Air Force, as there seems to be no air-launched version available for fast jets.

First a short discussion regarding the designations: IAI never mention Gabriel on their homepage, but they do market the Advanced Naval Attack Missile, and most sources agree that this is the Gabriel V. The odd one out is CSIS, which lists two versions of the Gabriel V, of which the ANAM is a shorter-legged and newer version of the original Gabriel V, which instead is designated Advanced Land Attack Missile. Also, the version of Gabriel bought is not publicly confirmed by the Finnish MoD, but there’s few possibilities. My working hypothesis is that while there might be slightly different versions the missile most commonly described by the Gabriel 5 / Advanced Naval Attack Missile designations is in fact the one bought by the Finnish Defence Forces.

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Probable Gabriel V launch from a Sa’ar 5-class corvette during Israeli SINKEX in 2016. Screenshot: IDF exercise video

Looking at the field, it was clear from the get-go that the big dividing line was between the IIR-seeker of the NSM compared to the traditional radar seekers of the rest of the field. Coupled with the stealthy body of the missile, this allows the NSM a completely passive approach. The phrase “they never knew what hit them” has never been truer. However, the world of physics also dictate that IIR-seekers perform worse in adverse weather conditions (snow, rain, fog, …) compared to radar ones, a serious drawback for any weapon designed to operate in the northern parts of the Baltic Sea. While Kongsberg always claimed that the NSM offers true all-weather capability, it has remained impossible to judge the true differences based on open sources. Also, the Finnish Defence Forces is known as being somewhat conservative when adopting new technology, preferring evolution over revolution. This became evident once again with the decision to opt for the tried and tested radar seeker, and notably stealth isn’t as important for a sea-skimming missile were detection ranges are extremely short.

The Gabriel has an interesting history. A month after the end of the Six Day War in 1967 the Israeli (ex-Royal Navy) Z-class destroyer was attacked without warning by three P-15 Termit anti-ship missiles from an Egyptian Project 183R Komar-class vessel sitting inside the harbour of Port Said. While tactical lessons of a WWII-vessel being hit by three missiles fired from inside a port basin might be discussed, it was clear for the IDF that a modern anti-ship missile was needed, and the Navy took over the failed Luz-program of surface-to-surface missile to produce what became the first version of the Gabriel. This proved to be an excellent weapon in the Yom Kippur War of 1973, where the Israeli Navy was the sole service branch to completely sweep the floor with the enemy.

The Gabriel missile was already once on its way out. Here the launcher of INS Mivtach, an ex-Israeli FAC currently a museum ship in Haifa which originally sported the Gabriel but changed to Harpoon from 1984 to its decommissioning in 1996. Source: Own picture

Development of the Gabriel continued, but by the mid-80’s the Harpoon was being introduced in Israeli service, and it looked like it spelled the end of the indigenous weapon. However, in a country famous for resurrections, death should never be taken for granted, and by the early years of the new millennium analysts where starting to question why Israel wasn’t upgrading their stocks to the new RGM-84L standard. Rumours started spreading about a new weapon being development.

The exact specifications of the Gabriel V are shrouded in secrecy, but it seems to be built according to generally the same form factors as the Harpoon. The first relatively confirmed sighting of the new weapon came two years ago, when a SINXEX involved the Israeli Navy firing a Harpoon followed by a new weapon. The stills are blurry to say the least, which seems to indicate a faster launch speed and/or worse camera than used to shoot the corresponding Harpoon launch. Another one of the few publicly available pictures/renders is found in this video, where an unspecified anti-ship missile is available as part of the IAI Skimmer-package for maritime helicopters. An air intake below the missile fuselage is found on the helicopter video but not visible upon launch in the SINKEX, but might be retractable or specific to the air-launched version.

A twin launcher for the original Gabriel with the carachteristic twin X-array of fins. The first generations of the missiel bear nothing but the name in common with the missile now acquired by the Finnish Defence Forces. Source: Own picture

On their homepage, IAI offers a few choice insights into the weapon. It does sport and active radar seeker, and while Israel has no archipelago whatsoever, they are situated close to one of the world’s busiest shipping lanes with the number of civilian and neutral vessels vastly outnumbering those of potential targets at any given time. This means that the missile should feel right at home in the Baltic Sea. The weapon also reportedly “copes with rapidly evolving tactical situation”, which can only mean that it sports a datalink.
It also “penetrates hard-kill defenses”, which likely is a cover phrase for end-phase maneuvering. From the video of the SINKEX the impact point low on the hull is visible, though it is impossible to tell whether the missile shown impacting the tanker is in fact the Harpoon or the Gabriel. On the cutaway it is evident that the weapon has a jet engine.

The size of the warhead is unclear. RBS15 sports an impressive 200 kg warhead, while Exocet sports a 165 kg one, the Harpoon ER has shifted down from a 220 kg to a 140 kg warhead, with NSM also having a 120 kg one. The question of what kind of destructive firepower is needed for the Navy to effectively stop the Baltic Fleet short in their tracks is an interesting one. In short, 200 kg of explosives going off won’t send a frigate or destroyer-sized target to the bottom of the Baltic Sea. A good example here is the attack on the Iranian 1,100 ton frigate Sahand. which was hit by five 220 kg warheads (including three Harpoons) and cluster bombs, and still floated for hours before fires reached the magazines of the ship. A common theme is that fires might however prove troublesome, as was seen with both the Swift, hit by an Iranian C-802 near Yemen, and the HMS Sheffield hit by a single Exocet in the Falklands war. In both cases the ensuing fires caused significantly more damage than the warheads themselves. In the case of the Sheffield, the warhead seems to have failed to detonate, but the impact put the main firefighting systems out of action, severely hampering the fire-fighting effort.

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Probable Gabriel V in the leftmost picture. Screenshot from IAI marketing video

If I had to take a guess, the warhead size of the Gabriel is likely closer to 120 than 200 kg. However, it can be argued that A) vessels need not be sunk to be effectively put out of action, and B) the majority of the vessels of the Baltic Fleet are relatively small compared to blue water ships such as destroyers. Also, modern warheads do pack a larger punch compared to similarly sized ones dating back to the 80’s. All in all, the choice to downsize from the current warhead size probably wasn’t a major factor in deciding the lethality of the Finnish Navy

One thing that has potentially been seen as an issue for the Gabriel has been the lack of shore-based systems. While the technical difficulties of creating a new launching system by mounting the tubes on a truck aren’t overwhelming, the certification process still will require some additional funding. Apparently this still fit within the given cost/capability brackets, especially as the MoD states that the deciding factors have been “performance vis-à-vis acquisition costs and schedule, lifecycle costs and security of supply, and compatibility with existing infrastructure and defence system”. Notably the maintenance will be done in Finland.

The Gabriel was decidedly something of an underdog, but it is clear that the Navy went into the project with an open mind and looking for the best option instead of just continuing in the tried and tested tracks of the next RBS15. Following the Polish and German export orders for the RBS15, diversifying the anti-ship missiles of the western countries around the Baltic Sea is also a good thing, as this makes it harder for the Baltic Fleet to optimise countermeasures.

INS Haifa (S322) firing an early Gabriel. Source: Nir Maor via Wikimedia Commons

The weapon also has a secondary land-attack capability, although the damage of the comparatively light warhead deals to any kind of hard target isn’t too impressive and the missile comes with a relatively hefty price tag. It could potentially have a role in taking out soft high-value targets, such as the kind of long-range radar systems. This demonstrates another case of a Finnish defence program moving into what the US likes to call ‘cross-domain’. In other words, joint capabilities where the ground, naval, and air domains interact over the boundaries to support each other either through kinetic effect or by providing targeting data for each other. As such, it does provide another part of the Finnish deterrence picture, further strengthening the ability of the Finnish Defence Forces to hit targets at long-ranges (most sources seem to agree upon at least 150 km range).

Imagine the following scenario: an HX-fighter identifies an enemy brigade headquarter being temporarily set up in the terrain close to highway E18, outside of the range of the Army’s long-range multiple rocket launchers. The maritime threat level is however low, and the Navy dispatches two Hamina-class FAC’s which in a few hours travel from their hiding locations near Örö, to take up positions west of Suomenlinna within the air defence umbrella created by the Army’s ground-based SAM systems covering the capital. From there they fire a salvo of PTO 2020’s, which strike the target 150 km east, not necessarily putting it out of action but dealing severe damage to it. While the missiles are still in the air, the Haminas retreat back to the safety of the cluttered archipelago, stopping for a refill of missiles at one of the several smaller ports found along the Finnish coastline. The whole operation is over well within 24 hours from that the fighter first spotted the target. That is cross-domains fires and joint capabilities.

9LV offered for Squadron 2020

1.2 billion Euros. That’s the quoted cost for Finland’s four new Pohjanmaa-class corvettes being built under the Squadron 2020-project. An estimate thrown around is that roughly half of that sum is the ship itself, and the other half is the naval specific items. While Rauma Marine Construction, RMC, has more or less secured the shipbuilding contract, the fight is still on for the “battle system”. This consists of the weapons, sensors, combat management system, and their integration into the vessel, and with a contract likely coming in at over half a billion Euros, it has certainly grabbed the attention of the shortlisted companies.

One of these is Saab (the other two being Atlas Elektronik GmbH and Lockheed Martin Canada Inc), and this means that I find myself together with a small group of Finnish journalists and their photographers in a nondescript conference room at Saab’s facilities in Järfälla just outside of Stockholm. The large site include a number of different production as well as R&D facilities, and everything is designated a protected site by the Swedish authorities, meaning that we have to pay close attention to what we are allowed to take pictures of. The reason is simple.

Things happen quite often, more than you know.

What exactly happens is left open to imagination, but it is clear that it includes both cyber security as well as people physically moving around in the vicinity of the site.

A Trackfire in ‘Western’ configuration with a heavy M2 Browning machine gun an a light FN MAG machine gun. The Finnish ones mount the NSV and PKM for these roles respectively. Source: Own picture

But if Saab isn’t too keen on discussing the details of attempts at intelligence gathering directed against them, they are very keen on discussing Finland. “It’s almost a home market for us”, senior director for Naval Combat Systems Mickael Hansson explains. “We are very proud of that as well” he says and points to the currently installed product base in the Finnish Navy. This covers everything from the Trackfire remote weapon system which the Navy has developed something of a love affair with (it has been bought for all three classes being built or undergoing MLU’s during the last years), via radars, remotely operated vehicles, communication systems, missiles, and on to the 9LV combat management system.

Jonas Widerström has got a computer with way cooler games than yours. Source: Own picture

The 9LV is found in the Rauma-class, and soon in the Hamina as well as the system was chosen for the MLU. When asked what he believes were the deciding factors, Jonas Widerström, Saab’s Naval Sales Director Finland, mentions price, harmonisation with the Rauma-class, and above all the robustness of the system. Widerström should know, being a retired naval anti-aircraft officer having served aboard Swedish corvettes he has ample experience of the 9LV. Interestingly enough, the Hamina-class currently sports Atlas Elektronik’s ANCS 2000 but instead of upgrading this the Finnish Defence Forces chose to tear it out and replace it with Saab’s offering. While the Hamina MLU technically isn’t related to the Squadron 2020 CMS contract, it is clear that the MLU-contract means that Saab is the favourite for the larger deal as well. And Saab doesn’t beat around the bush when it comes to this.

We want to win this.

How is Saab then planning on doing this? The talking points comes as no surprise. They include a “comprehensive industrial participation package” and the value of having a harmonised C3I system with not only the Hamina-class but with the Swedish ships of the Swedish-Finnish Naval Task Group (SFNTG) as well. The 9LV is also sporting “pretty advanced” capabilities when it comes to converting between national and international data links and “very good sensor fusion software” with a rapid response time. Saab also points out that they have worked with the ESSM before on the Halifax-class (ironically as part of a team led by Lockheed Martin Canada), a system which “can be, maybe be on the SQ2020”.

To top off the offer Saab is bringing their own sensor suite. This is centered around the Saab Lightweight Integrated Mast (completely unironically abbreviated SLIM) which will be manufactured by Saab and delivered as a complete subassembly to the yard for installation aboard the ship. As a parenthesis, Saab explained that the renders showed this particular SLIM-setup “on another ship” and not on the Pohjanmaa-class. Hmm, I wonder what ship that could be…?

Pontus Djerf – if you need a radar, he’s got something to sell to you. Source: Own picture

The mast sports a number of sensors and communication antennas, the most important of which are the vessels main active sensors: the Sea Giraffe 4A FF (Fixed Face) and a single rotating Sea Giraffe 1X found inside. Keen readers of the blog will remember that Saab originally planned for a setup with a single rotating 4A accompanying the rotating 1X, and while the head of marketing and sales for Surface Radar Solutions Pontus Djerf (another retired commander) maintain that it is an solution that’s “often good enough”, the fixed face version is more future proof and provides additional benefits. As the project has proceeded, this has led Saab to swap out the rotating 4A to the FF. The fixed 1 x 2 meter AESA-arrays cut response times, but it does not replace the need for the 1X. Instead the two complementing radars operate in S- and X-band respectively (in addition any CEROS FCS-systems would bring a Ku-band radar to the ship) which brings a certain amount of redundancy and jamming resistance while also providing radars optimised for slightly different roles. In short, the 4A looks at the larger picture, while the 1X has shorter range but better resolution. Notably both radars sport features borrowed from Saab’s work with artillery location radars and small targets (such as UAV’s), or C-RAM and ELSS respectively.

A wild Giraffe 100 AAA appears! Finland operate a number of older Giraffe-radars, including the Army’s LÄVA short-range air surveillance radar. Source: Own picture

These are all interesting features for the Finnish Defence Forces, because as opposed to blue water fleets, the Finnish Navy is very much a force present on the right flank of the battlefield in any potential conflict. As such, the corvettes will play an important role in the grander picture (‘joint’ is a keyword for both the Squadron 2020 and the HX-programs) when it comes to establishing situational awareness and providing medium-ranged anti-aircraft support around the most populous areas of Finland. To be able to fill the needs of higher command, a serious sensor array of both active and passive systems coupled with an effective combat management system and the datalinks to share this information. Saab seems confident that they have the solution, and that they do so at a balanced cost/performance-ratio. We will have to wait for a few months and see if the Finnish Navy agrees.

Torped 47 – Steel fishes back into Finnish service

On the evening of 18 November 1942, three Finnish motor torpedo boats entered the Soviet port at Moschny Island (Fi. Lavansaari) and fired four torpedoes which sank the Soviet 1,700 ton gun boat Krasnoye Znamya at its moorings, after which they sped away unscathed. The daring raid is the high point in the history of Finnish torpedoes, and five years later torpedoes were effectively banned from Finnish use with the Paris Peace Treaty.

Like the case with guided missiles, the ban would in the end give way to Soviet weapon exports. In this case torpedoes reappeared on the (official) Finnish TOE with the acquisition of two Project 50 ‘Gornostay’ (NATO-designation ‘Riga’-class) frigates in the mid-1960’s, both of which sported heavy torpedoes (533 mm). The local renaissance of the torpedo was however cut short by the fact that the ships themselves weren’t overly successful, and importantly they were too manpower intensive for the small Finnish Navy. In the end, they were retired in 1979 and 1985 respectively.

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Saab’s render of the NLWT in full ‘warpaint’. Picture courtesy of Saab

Now, while the heavy torpedo slowly gave way to the anti-ship missile as the premier weapon in ship-to-ship combat, the lightweight torpedo became the anti-submarine weapon of choice for most navies in the world. In Finland things were a bit different, mainly because of the shallow and constrained waters which dominate the northern shore of the Gulf of Finland. However, things slowly started to change with the introduction of ever more capable diesel-electric submarines and different kinds of midget submarines in the Russian Baltic Fleet. While running towards the enemy at speed and throwing depth charges might have worked against a Project 641 ‘Foxtrot’-class, it was very doubtful whether it would against more modern designs such as the current Project 877/636 ‘Kilo’ or the upcoming Project 677 ‘Lada’.

With these developments under the surface in combination with the Finnish Navy shifting more and more priority from defence against enemy amphibious landings/naval movements to protection of merchant shipping, it was clear that the ASW-capability needed a boost. There simply needed to be more ships capable of performing ASW, and they needed a longer reach to avoid being sunk outside of the range of their own ASW-weapons. Enter the second reintroduction of torpedoes into Finnish service, with the decision that the Hamina-class and the upcoming Pohjanmaa-class (Squadron 2020) would both get light torpedoes.

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Håkan Ekström, Saab’s sales director for underwater systems. Source: Own picture

The choice of torpedoes was revealed early January this year, with the announcement that Saab’s new lightweight torpedo (NLWT) had been chosen. As a matter of fact, the torpedo is so new that it hasn’t got a company name yet. “There is a name in the works”, Saab’s sales director for underwater systems Håkan Ekström discloses. In the meantime, the Swedish Defence Forces has already named the new weapon Torped 47 (sans-o, as that’s how the word is written in Swedish).

That Finland would opt for the NLWT was rather unsurprising, considering that it is highly optimised for the kind of littoral environment that any Finnish submarine hunt would take place in. Compared to ‘blue waters’ (open seas), looking for submarines is vastly different in the Baltic Sea. Detection ranges, and combat ranges for that matter, can easily be much greater than the depth, leaving the combat taking place in what the product manager for torpedoes, Thomas Petersson, described as a “Thin slice of water”. This causes issues for active sonars, as in the oceans anything spotted by them is usually either a submarine or some kind of sealife. In the Baltic Sea, most echoes are simply coming from the seabed, leading to a more difficult discrimination problem. The water also has some interesting behaviors, part of which comes from the many rivers flowing into the sea. These bring fresh water of various temperatures and significant amounts of sediments into the sea, leading to sound waves in some cases experiencing refraction in two directions (see this short and nice primer on how different temperatures messes up submarine hunting). In short together with the cluttered seabed detection becomes difficult, leading to relatively short engagement ranges.

Saab’s answer is the NLWT, which sports a number of niche features which combine to address the problems of subhunting in littoral waters. To begin with the torpedo is wire-guided, meaning that the operator aboard the ship can easily control the torpedo throughout its course. This also allows it to be used like a forward-deployed sensor, in that the operator can use its active sonar to look for targets, at different depths, as the torpedo is happily moving towards the suspected submarine location. The torpedo also has a very low slowest possible speed, allowing it to run very silently, further increasing the effectiveness of its sonars (the torpedo can be fired in both active and passive modes). One crucial difference is that the active sonar is operating at a somewhat higher frequency than usual for light torpedoes, giving it better resolution on the sonar picture as a tradeoff for somewhat shorter viewing range. The torpedo also has a quick launch sequence and rapidly goes into stable running, to ensure that it doesn’t touch the bottom and can handle the earlier mentioned short engagement ranges efficiently.

The earlier Torped 45 being fired of a ship during an ASW exercise. Note the two unshrouded screws, the most obvious external difference compared to the NLWT. Source: Jimmie Adamsson/Försvarsmakten

For the technical specifications, NLWT is made out of aluminium, and sports a pump jet with a single rotating impeller and a stator in place of the earlier Torped 45’s two unshrouded coaxial counter-rotating screws. The battery has also been upgraded, with lithium iron phosphate (LiFePO4) batteries replacing the earlier silver-oxide. This allows the torpedo to stay launch-ready for longer times in the launch tube, which also functions as the plug-and-play storage tube. The launch tube also include pressurised air to eject the torpedo and a spool of the same wire as is found inside the torpedo. If the torpedo moves, the torpedo spools out wire, and if the vessel moves the launch tube spools out wire. This ensures that the wire stays stationary in the water after the first few meters of the torpedo run, making sure that it doesn’t tangle or break. In the case of a wire break the torpedo will either abort or continue in fire-and-forget mode, depending on the mode chosen before launch. After a torpedo has been launched, the whole empty launch tube is switched out to a new tube with a launch ready torpedo inside it. This switch takes around 15-30 minutes for a trained crew and doesn’t require any specific equipment other than a suitable crane to handle the load. As such, it could conceivably be handled at sea (sea state allowing). The used launch tube is then sent back to a naval base to be reloaded. The direct drive DC-motor together with the new batteries provide a range measured in “tens of kilometers”, the exact number being both classified and highly dependent upon the speed of the torpedo.

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The first prototype of the NLWT during tests at Motala. Note orange dummy warhead, wire being retrieved in the bucket aft of the torpedo, and the grey disc on top of the torpedo immediately behind the warhead which marks the location of the proximity fuse. Picture courtesy of Saab

The active sensor provides a detailed enough picture that it can measure the length of the target, and any major features such as the conning tower can be made out. During the run the torpedo maps all return echoes, run validity checks, and reports on valid targets. If allowed it will then intercept the closest valid target inside the search box, and in case of a miss it will re-acquire for another attack. The seeker has been used successfully during live-fire exercises against targets the size of midget submarines, and Saab is confident that it can handle these kinds of targets as well as regular submarines. An interesting feature is the anti-ship capability, and though the small warhead (Saab declines to give the size, but notes that most light torpedoes carry a warhead weighing “about 50 kilograms”) won’t sink any major surface units, it does punch above its weight in that it has a dedicated ASuW-attack mode going beneath the vessel and using an upwards-looking proximity fuse to detonate under the keel. The combined effect of the gas-bubble which removes the water that carries that part of the vessel combined with the impact of water rushing back to fill the hole is enough to literally break ships in two when employed by larger torpedoes, and while the NLWT won’t repeat that, it will most likely send any corvette limping back to base with the hull distorted and propulsion shafts out of alignment.

Part of this performance comes from the Swedish requirement to be able to use the torpedo from both surface ships, submarines, coastal launchers, and aircrafts/helicopters. For the submarines, the light torpedo plays an important role as a self-defence weapon, as well as for hunting other submarines. For the Hamina-class, they will sport a single fixed twin launcher on the rear deck, allowing enough space for the RIB-launch to remain in its current position. Looking at the future, the contract with Saab also include an option for the four Pohjanmaa-class corvettes, and everything points towards this option being exercised within the next year or so when the acquisition of weapons for the corvette program starts to take place.

The current Finnish contract for the torpedoes include the systems for the Hamina-class and an undisclosed number of torpedoes, as well as training at the torpedo research and development center in Motala. This is also where we are shown the first prototype of the weapon, which is just about to finish its part of the development program. The production of the units themselves, and prototype number two which is currently in production, takes place in Linköping. Deliveries to both Finland and Sweden will start in 2023, and FNS Tornio, the first of the Hamina-class to undergo MLU, will be ready to go to sea with the launchers fitted already next year. Notable is that the Swedish Defence Materiel Administration, FMV, is closely involved in the project and is the launch customer that has contracted Saab to develop a new torpedo. However, the Finnish contract with Saab does not include any research and developments, but is purely for production and supply (including torpedoes, hardware needed for their operation, documentation, and training). However, at the same time the Finnish Defence Forces Logistics Command, PVLOGL, has signed an agreement with the FMV regarding cooperation and loans of Torped 45 to cover the period 2019 to 2023 when the Finnish Navy will have torpedo capable ships but no torpedoes.

‘Borrowing’ something that is literally worth millions of Euros sounded a bit suspicious to me, so I decided to contact FMV to confirm that it wasn’t just a case of Saab spelling ‘leasing’ wrong. However, FMV confirmed that it is indeed the case that the Finnish Defence Forces gets to borrow a non-disclosed number of torpedoes for free, as long as they are used and maintained according to official documentation. The aim of this agreement is that Finland will be able to operate with the Torped 45 aboard FNS Tornio already next autumn. Part of why this generosity is bestowed upon the Finnish Navy is no doubt that torpedoes occupy a rather unique role amongst modern munitions in that after launch they can be retrieved (the training warhead sports a flotation device in the form a inflatable ‘balloon’), and after the wire has been respooled and the battery recharged they are good to go again. As such, this is quite different compared to e.g. borrowing artillery rounds.

However, another angle is without doubt the value for Sweden of having Finland as an operator of the same system. Not only will this offer benefits when jointly performing ASW missions as part of the Swedish-Finnish Naval Task Group (the SFNTG), but a second cooperation deal signed at the same time between FMV and PVLOGL concern the future of the NLWT. Under this the two nations will cooperate around the acquisition and continued development of the torpedo system. By creating these kinds of synergies the costs for operating and keeping the system up to date will hopefully be lower for both users, and the agreement also open up the doors for increased cooperation around the ASW-mission as a whole.

The first draft of the text and pictures, with the exception of those parts based on information given by FMV, has been provided to Saab for screening to ensure that no classified, export controlled, or company confidential information is included.

RBS15 – on the road to the Next Generation

“Psychedelic” is the word I hear someone standing next to me use to describe the room. I agree. We are standing inside what is roughly a 13 m long cube, with all the surfaces being covered with soft blue spikes of different sizes. The room is completely void of echoes, and they say that if you stand here alone, you will eventually hear your heart beating. Loudly. The only objects standing out is a large frame mounted halfway up one wall, and a pattern of blank discs mounted opposite the frame, these being the flight motion simulator and the antenna wall respectively.  We are in the anechoic chamber at ELSI, and I almost expect GLaDOS to start talking to us.

ELSI, or the Electrical Warfare Simulator, is at the hearth of Saab’s anti-ship missile program. The seeker-head of the RBS15 missile is mounted on the flight motion simulator, which moves the seeker in 3-axises as it ‘flies’. On the other end of the room the antennas sends out signals corresponding to what the seeker would see at any given moment during its course. This includes not only target signatures, environmental effects, and countermeasures in the form of false targets and active jammers. All this, coupled with the seekers simulated position and real-world direction, are then used to create the model, which is fed to the antenna wall’s signal generator which creates artificial radar returns for the seeker head. As noted, it is very much a case of the actual hardware being in the loop during testing.

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RBS15, sporting a 200 kilogram warhead to dissuade enemy ships from getting within 200 kilometers of your waters. Source: Own picture

The story of ELSI goes back to the early 90’s, when the board decided upon the investment, partly to ensure that Saab would be able to expand their share of the export market in an age of shrinking defence budgets. 1994 the site was running its first tests, and four years later it was operating at the desired level, a host of teething problems having been fixed.

Finland is no stranger to the RBS15, having operated the first generation of the missile from ship and shorebased batteries under the local designation MTO-85 since the late eighties. As such, a Finnish delegation visited ELSI early on in 1999, with the latest Finnish threat pictures. The purpose was to run a comprehensive round of tests with the MTO-85 seeker, which then provided the basis for an upgrade program launched at Saab. The upgraded seeker was then run through the same set of tests the following year. The tests can’t have gone too bad, as two years later the upgraded RBS15 SFIII, a customised RBS15 MkII, was introduced in Finnish service as the MTO 85M.

Now the RBS15 is a hot topic again for Finland. The anti-ship missile is one of the candidates for the PTO2020-program, the current acquisition to replace the MTO 85M on the Hamina-class following their ongoing MLU and in the truckmounted batteries, as well as becoming the main surface-to-surface weapon for the new Pohjanmaa-class corvettes (Squadron 2020). And Saab is confident that the RBS15 will be a prime candidate this time as well.

Saab has two distinct versions on the table. Noting that the baseline version was nearing the end of its life, Saab embarked on an ambitious upgrade program. While the step from MkI to MkII was an upgrade, the Mk3 was a radical redesign resulting in what was basically a completely new missile. Following a four-year test program it was adopted by the German Navy, and shortly after that by the Poles. The Swedish Navy is still soldiering on with the MkII, and would have been happy to adopt the Mk3. However, the Swedish Air Force had other thoughts, and had a requirement for the weapon to be lighter to allow four missiles to be carried simultaneously by the upcoming 39E Gripen. The result was the RBS15 ‘Next Generation’ (still lacking an official designation, though Mk4 wouldn’t come as a surprise), which is an upgraded Mk3 with a lighter launch weight, longer range, and generally improved performance. The weapon is contracted for introduction into Swedish service for both the Navy and the Air Force during the next decade, and Saab doesn’t mince words: “It is the most capable and advanced anti-ship missile on the market”, as was explained to us during a briefing.

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The new launch tubes for the RBS15 Mk3 are seemingly of a more complex shape than the older ones, but under the surface ease of manufacture actually means they are cheaper. Source: Own picture

The new launchers are a chapter for themselves, with the original box-like launcher having been replaced by octagonal tubes. The reason behind this is cost-savings, as the original box held the missile tilted 45° to one side, meaning that the railings holding the missile inside the box have very demanding tolerances. The newer launch tube instead holds the missile level, which is somewhat more forgiving on the structures. But it in turn leads to new questions. “The Visby-class will fit the NG, but we have already cut square holes in the side for the MkII, so in that case we will use the old launcher,” a technical sales support engineer explained. “The missile itself doesn’t really care, it can handle both positions.”

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The humble MSU (Missile switching unit) is the only major piece of hardware except the launch container that is needed aboard a vessel to be able to fire RBS15. Source: Own picture

What then is so special about the RBS15? From a Finnish standpoint, the Baltic Sea as the design environment of choice is interesting. The often poor weather combined with a cluttered archipelago and lots of civilian traffic makes for a challenging battlefield, and Saab is one of very few companies designing their anti-ship missiles from the outset for littoral waters as opposed to the open sea. This is also where ELSI comes into play. allowing for advanced simulations of the performance of the seeker, something which plays a key role in evaluating parameters such as ECCM and target discrimination. The weapon is also capable of performing the land-attack role against ‘soft’ targets, though it is not optimised for the role in the same way as ‘true’ land-attack cruise missiles.

The ships we are firing against are not that keen on being hit.

The flight path of the missile is guided through a number of pre-set 3D waypoints, and the missile then navigates using both GPS and inertial navigation to make sure it hits all waypoints on time. Timing is key for features such as simultaneous time-on-target, a default feature for the RBS15, and as such the missile will throttle up and down in flight as needed to hit all waypoints on the exact time given. The exact height of the sea-skimming part of the trajectory also varies according to sea state, with larger waves naturally forcing the missile to fly at higher altitude. And in case the missile misses its target, it will swing around and do a reattack. If no target is found at all, it will eventually head off to a pre-set destruction point, which can be altered by the operator to make sure the missile doesn’t fly off and self-destruct over the nearest town.

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Saab’s technology demonstrator 39-7 displaying the capability to carry two RBS15 under each wing, giving a four-ship of Gripen E an almost unrivalled firepower against enemy shipping. A full salvo will be devastating against enemy warships, but also comes at a hefty price. Picture courtesy of Saab Ab

For PTO2020, Saab hasn’t offered a specific variant, but instead opened the shop and described the Mk3 available today and the NG available tomorrow. The systems will also be interoperable, with NG launchers able to fire Mk3 and Mk3 launchers able (after a software update) to launch NG missiles. Customisation, as has been the case with the earlier Finnish versions, is also an option, but Saab notes that less and less countries are willing to pay the premium of having a customised missile. From a Finnish perspective, the supply chain is interesting. Diehl in Germany handles final assembly, with Saab building many major subassemblies and handling much of the development work and testing in Linköping. However, a new location on the map is Saab’s brand new technology centre, the STC, in Tampere, which is heavily involved in the electronic warfare side of the technology for the RBS15 NG.

The first draft of the text and pictures has been provided to Saab for screening to ensure that no classified, export controlled, or company confidential information is included.

Ballistic Missile Defence for Pohjanmaa?

As was noted earlier Finland has requested the export of quad-packed ESSM surface-to-air missiles for fitting in the Mk 41 vertical launch system (VLS). In itself the request was rather unsurprising, but I did find it odd that the Navy was asking about the canister designed for the Mk 41 and not the dedicated Mk 56 ESSM VLS.

Operation Iraqi Freedom is the multi-national coalition effort to liberate the Iraqi people, eliminate IraqÕs weapons of mass destruction, and end the regime of Saddam Hussein.
Mk 41 Strike length launchers in action, as the destroyer USS Donald Cook (DDG 75) fires a TLAM cruise missile against Iraqi targets in 2003. Source: US Navy via Wikimedia Commons

This week a key part of the answer was revealed, as the DCSA report for the Mk 41’s themselves was released. The Finnish request is for four 8-cell Mk 41, of the full-long ‘Strike length’ version. This is the same as carried by US Navy (and Japanese) destroyers and cruisers, as well as by a number of NATO frigates. The options for the strike length launcher include a large variety of US-built surface-to-air missiles, as well as the TLAM (Tomahawk) long-range cruise missile and the VL-ASROC anti-submarine weapon (a rocket which carries a parachute-retarded anti-submarine torpedo out to a considerable range). The downside is the size. To fit the large missiles, the cells are 7.6 m long. The logical choice if one want to fit Mk 41 solely for use with ESSM’s into a corvette is the 5.2 m Self-defense module. In between the two is the 6.7 m Tactical length cells, which add the SM-2 long-range SAM and the ASROC, but is unable to fit the TLAM or the SM-6/SM-3/SM-2 Blk IV (SM-2 with a booster). The SM-2 Blk IV and SM-3 are able to target ballistic missiles, while the SM-6 is a longer-range missile against airborne targets.

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Concept render showing the key combat systems of the vessel. Note the placement of the surface-to-air missiles. Source: Finnish MoD

Now, as late as last week I said in a discussion that it is not possible to fit the Strike length cells on the Pohjanmaa-class, as they are too long for a corvette. In all renders so far the VLS cells have been fitted in front of the superstructure, on deck level. Considering the low draft of the Pohjanmaa-class corvettes, just over 3 meters, it is doubtful whether the cells can be fitted within the confines of the bow. However, if the single cell is mounted along the centreline as opposed to across it, and if it gets a stepped platform a’la Type 26, it just might be doable (or a reshuffle with the Mk 41’s moving into the superstructure and the SSM’s moving to the foredeck/mission bay/further forward/aft/somewhere else).

So why would the Navy be interested in a cell that is two sizes larger than the missile they are planning on pairing it with? The answer is likely that they want to keep all options open. While I very much doubt that the ASROC would fit Finnish doctrine, the TLAM could open up new possibilities. However, if the Defence Forces want more cruise missiles, buying more of whatever will replace the JASSM on the winner of the HX-program is likely the better option (or alternatively buying a long-range weapon for the M270 MLRS). However, the possibility to provide some measure of protection against ballistic missiles might be of interest. While it certainly would be a major undertaking, the vessels will be in service for a long time and “fitted for but not with” is a time-honored tradition when it comes to naval shipbuilding. It should be noted that all kinds of ballistic missile defences are politically highly sensitive. Analysts have noted the similarities to the acquisition of the multirole F/A-18 Hornet back in the day, where even if the fighters were capable of flying ground attack missions, political considerations meant that the capability was only taken into use at a later stage, with the MLU2 mid-life upgrade.

The strike length cells also open up the possibility to fit some interesting anti-ship missiles in the future, as both the LRASM and the JSM are currently being tested in configurations suitable for launch from the Mk 41. Being able to swap out a number of SAM’s for more anti-ship missiles might be an interesting option at some point down the road (or at least interesting enough that the Navy doesn’t want to close the door just yet).

I will admit that the latest development have taken me by surprise. However, it does seem like the Navy is serious about fitting the vessels with systems that will allow them to field firepower to rival some significantly larger vessels. The question is whether the budget will live up to the ambitions?

No Finnish Harpoon/ESSM-order (at least for now)

As the headline says, yesterday’s big news from the naval sector is not that Finland has ordered the Harpoon and/or the Evolved Sea Sparrow Missile (ESSM). In fact, what has happened is that the US offers for two major Finnish naval programs have become open knowledge. This happened as the US Defense Security Cooperation Agency has requested clearance for the sale of 112 RGM-84Q-4 Harpoon Block II+ ER anti-ship missiles (of which twelve are of the older RGM-84L-4 Harpoon Block II version which will be upgraded) and 68 ESSM missiles. These kinds of pre-clearances are not uncommon, and allow for a rapid deal following a (potential) procurement decision by a foreign customer (thanks to Aaron Mehta for providing insights about US export).

One of the latest renders, showing the refined corvette concept. Source: Finnish Defence Forces / Insinööriupseeriliitto

The background is two ongoing Finnish projects: the Pohjanmaa-class multirole corvettes and the PTO 2020 heavy surface-to-surface missile. The PTO 2020 will be found aboard the Pohjanmaa-class as well as replacing the current MTO 85M (roughly a RBS 15 Mk II) on the Hamina-class as part of their MLU as well as in truck-mounted batteries. As the MLU for the Hamina is very much underway already, the winner of the PTO 2020 will be announced during the first half of this year. I am still standing by my opinion that the RBS 15 Mk 3+ and the NSM are the two frontrunners, and would be somewhat surprised if Harpoon won the trophy (and even more so if the Exocet MM40 Block 3 did, though everything is possible).

The Pohjanmaa-class is still in the design stage, with the main contract(s) to be signed this year, and the building phase to start next year. The armament shown on renders include two quadruple mounts of PTO 2020 amidships, the new lightweight torpedo from Saab, the BAE/Bofors 57 mm Mk II deck-gun, and a battery of vertical launch system-cells (VLS). The two main VLS-systems on the market are the French Sylver and the US Mk 41 (a modernized version called Mk 57 is also available, and mounted on the Zumwalt-class). Both are available in different lengths, with the shortest Sylver, the A43 (an earlier A35 concept seems to have been dropped), being around 4.3 m long (or rather, high), and the shortest Mk 41 being 5.2 m long. The 8-cell module of the Sylver is also smaller and lighter than the corresponding 8-cell Mk 41 module, in part because the silos themselves are a few centimeters smaller. For a full run-through of the differences, see this post by the UK Armed Forces Commentary-blog, where the differences are discussed with a keen eye to the pros and cons for the British Type 26 Frigate.

An ESSM leaving a Mk 41 cell. Source: US Navy via Wikimedia Commons

Now, while some vessels, such as the current Finnish Hamina-class and the upcoming British Type 26, feature dedicated cells to their main air-defence assets, the VLS on the Pohjanmaa will likely be home to the ships main air defence weapons. This becomes evident as the ESSM offer is for the weapon quad-packed in Mk 25 modules, designed to fit the Mk 41-system. If the ESSM would be chosen, the Pohjanmaa-class would be by far the smallest vessel to feature the system. The decision to offer the Mk 41 is interesting, as there is a dedicated Mk 56 ESSM VLS-system if the sole use would be for the ESSM.

The ESSM is certainly a competent weapon, and shows what the Navy is aiming for. 8-16 cells with quad packs would provide for 32-64 medium-ranged missiles, a huge boost compared to the current 8 short-range Umkhontos found on the Hamina. While the Mk 41 is too big for the Hamina, the Mk 56 mean that half a dozen ESSM’s could potentially be fitted as part of the MLU if the Navy choose to go down that (unlikely) route. More interesting is that the ESSM could be fired from the Army’s NASAMS surface-to-air batteries, letting the Navy and Army use the same missile stock. The upcoming ESSM Block 2 will feature an active seeker based on that of the AMRAAM, and is potentially the version offered to the Pohjanmaa.

Interestingly, the AMRAAM-ER is a AMRAAM married to the engine of the ESSM, and no, I don’t know what exactly is the difference between an AMRAAM seeker married to an ESSM engine and an ESSM engine married to an AMRAAM seeker.

I am still inclined to believe that the Sylver might be the Navy’s preferred VLS due to the smaller footprint. However, as with the PTO 2020, we will just have to wait and see.

Saab Bound for Naval Grand Slam?

As the modernisation of the Finnish Navy’s surface fleet continues, Saab has managed to secure two key contracts. Earlier, it was announced that Saab would provide the new anti-submarine torpedoes set to be fielded by both the modernised Hamina-class FAC as well as the new Pohjanmaa-class corvettes (Squadron 2020). In many ways this was the low hanging fruit for Saab. Not only is development of their new torpedo well underway with Sweden as the launch customer, it is also based on proved technology in the form of the earlier Torped 45, making it possible to operate the older version from the installed tubes until the new Torped 47 is ready. Perhaps crucially, it is one of few weapons of its class designed with an eye to use in littoral and brackish waters, key features of the operating environment of the Finnish Navy.

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Leadship of the class, FNS Hamina (’80’) two years ago. Note forward 57 mm main gun, roof-mounted CEROS 200, and 12.7 mm NSV heavy machine gun behind bridge. Source: Merivoimat FB

This week Saab landed a bigger fish, as it was announced that they will provide the combat management system, fire-control system, integrated communication systems, as well as optronic sensors for the Hamina MLU. The odd bird out is the fact that the order include the CEROS 200 optronic sensor, which is already fitted to the vessels. Either these are worn out to the extent that buying newer is cheaper from a maintenance point of view, or there have been internal upgrades of the CEROS 200 since the original deliveries almost twenty years ago that have not been reflected in the name of the product, but are extensive enough to warrant buying complete units and not simply giving the CEROS its own MLU.

Another interesting inclusion is the Trackfire remote weapon station, with the Hamina now being the third class in the Finnish Navy to receive the RWS. The use of the Trackfire on the Hamina isn’t specified, but the wording in the press release does seem to indicate a single system per ship. As such, while it is possible that two stations per vessel will replace the port and starboard manually operated 12.7 mm NSV heavy machine guns mounted amidships, the likelier scenario is that they will take the place of  the main armament. There has been talk (so far unconfirmed?) that the main 57 mm guns (Bofors Mk 3) of the Hamina vessels will be removed as weight saving measures and transferred to the four Pohjanmaa-class vessels, and this would fit right in. While the Trackfire is usually seen fitted with a heavy machine gun as the main armament, it is capable of holding “lightweight medium calibre cannons”, i.e. weapons up to and including low-pressure 30 mm ones. This is not an unheard of solution, with e.g. the Israeli Typhoon RWS being used with a number of the different Bushmaster-series of cannons as the main or secondary gun on a number of different naval vessels out there. A 30 mm Bushmaster, the Mk 44, is already found in Finnish service on the CV 9030 IFV, but before anyone gets too enthusiastic it should be noted that this uses a longer high-pressure round, so there is no synergy to be had. Instead, something like the M230LF, based on the chain gun found on the Apache helicopter, is the more likely candidate.

Dropping down in calibre from 57 to 30 mm is not necessarily a bad thing, as the main use of the weapon will likely be air defence and intercepting light craft. Modern 30 mm rounds will do quite some damage against soft targets such as warships as well, though naturally you won’t win a gun fight against a large vessel sporting a 3 or 5 inch gun anytime soon (to be fair, if you find your FAC up against a destroyer at gun range something has likely gone very wrong already at an earlier stage of the battle).

Jehu-class landing craft with a Trackfire RWS on top of the superstructure. For the landing crafts the usual mount is either a 12.7 mm NSV or a 40 mm GMG, with a 7.62 mm PKM as a co-axial weapon. Source: Merivoimat FB

At the heart of the Hamina order is the 9LV, an open architecture system which allows integration of different sub-systems, sensors, and weapons into a single integrated package. As such, different building blocks can be integrated into CMS systems from other manufacturers, or other manufacturers’ subsystems can be integrated into the 9LV CMS. That Saab gets this kind of a complete deal including both the CMS, FCS, integrated communication systems, and part of the weaponry is significant, especially when looking towards the soon to be decided contract for a main systems integrator for the Pohjanmaa-class, a job which will likely be of significantly higher value than the Hamina MLU.

The main implications is that this makes Saab the front-runner for the Pohjanmaa-class CMS. Earlier the Rauma-class FAC received the 9LV during its MLU, and now on the Hamina 9LV is replacing Atlas Elektronik’s ANCS 2000-system. While the requirements for the CMS of the Hamina and the Pohjanmaa are not completely identical, there certainly is something to be said when the former replaces one of the shortlisted CMS’s with the another one, instead of simply upgrading it. It should also be remembered that several subsystems, including most weapons, will be the same for both vessels.

Yet another noteworthy development is that Saab recently announced a new fixed face version of their Sea Giraffe, in the form of the Sea Giraffe 4A FF. I have earlier questioned whether Saab’s twin rotating mast solution would satisfy the requirements of the Navy, and it seems clear that the 4A FF is a possible solution for the Pohjanmaa’s main long-distance sensor. As Saab is also well positioned to secure the order for the new PTO2020 surface-to-surface missile, they just might be on track to secure all major Finnish naval contracts they are bidding for.

FNS Pori (’83’), the newest of the four Hamina-class vessels, underway. Source: Merivoimat FB