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Safran announced on October 19, 2016, that its Sigma 40 shipborne inertial navigation system had passed integration tests with the alignment system associated with the AGM-84 Harpoon missile system. The work was intended for Royal Thai Navy Krabi-class corvettes and KDX-class frigates, under a contract with South Korean shipbuilder DSME and in collaboration with Boeing, which Safran identified as Harpoon’s prime contractor. This was a ship-and-weapon-system integration milestone—not a reported Harpoon launch or live-fire test.
What Safran announced
At Euronaval 2016 in Paris, Safran Electronics & Defense said it had successfully completed tests integrating its Sigma 40 shipborne inertial navigation system with the alignment system for the AGM-84 Harpoon. The planned customer platforms were Royal Thai Navy Krabi-class corvettes and KDX-class frigates. Safran said the work was part of a contract signed with DSME, the South Korean shipbuilder, and that it worked with Boeing on the Harpoon-system integration. Safran’s announcement is the primary public account of the campaign.
Safran described the result as opening the way for its inertial-navigation solutions to be used across Thailand’s warships. That is the company’s stated implication; the release does not provide an independently verified, ship-by-ship installation or acceptance list.
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What “alignment” means in this context
A ship’s inertial navigation system (INS) estimates the vessel’s position, heading and motion using inertial sensors. It can also provide reference information used to stabilize shipboard sensors and weapons. A missile launch system, in turn, needs a properly aligned reference to initialize its launch solution. Integrating the two systems is about ensuring that the relevant ship-navigation and weapon-system components can exchange and use the necessary reference data in the intended configuration.
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That connection matters because small reference, coordinate-frame or timing errors can undermine the usefulness of otherwise sound navigation data. In a real integration, engineers would need to account for matters such as ship and launcher offsets, data formats and update timing. Those are general systems-engineering considerations, not details Safran disclosed about its particular test procedure.
The distinction between the ship’s navigation reference and the missile’s own guidance is essential. Sigma 40 was not described as being installed inside Harpoon, steering it, or replacing its onboard guidance. The U.S. Navy’s NAVAIR overview of Harpoon describes the weapon’s guidance architecture separately: mid-course guidance, radar-altimeter monitoring and active-radar terminal homing. Some later Harpoon Block II descriptions also include GPS-assisted inertial navigation, but Safran’s 2016 announcement does not identify the missile block or configuration involved in the Thai integration work.
What Sigma 40 does
Safran described Sigma 40 as a compact naval INS built around a ring laser gyro (RLG) inertial core. Inertial navigation provides position and motion references without relying continuously on satellite reception, while an RLG measures rotation to help establish the vessel’s orientation and movement. Safran associated the system with ship navigation and the stabilization of sensors and weapons, as well as scalable hardware and software options.
The French-language version of the 2016 release refers to high navigation precision over time, including performance beyond 96 hours, but the English announcement supplies no numerical drift or accuracy specification. Neither release gives a measured Sigma 40 result from the Harpoon integration campaign, so the French description should not be treated as a test metric. Safran’s French release provides that additional product context.
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An INS can remain useful when satellite navigation is unavailable or degraded, but that does not mean it is immune to error: inertial estimates drift over time, and performance depends on the system, alignment, external updates and operating conditions. A successful interface test therefore does not by itself establish a particular navigation accuracy or combat-system performance.
Harpoon and the Thai ships
Harpoon is an all-weather, over-the-horizon anti-ship missile system. The designation AGM-84 refers to the air-launched form; the wider family includes air-, surface- and submarine-launched variants, commonly designated AGM/RGM/UGM-84 according to launch mode. Surface- and submarine-launched versions use a booster, unlike the air-launched version. NAVAIR lists Boeing as the contractor and describes the family’s launch modes and guidance functions. Safran’s release does not identify the Harpoon block or precise launch configuration used in the integration tests.
The named ships point to a Thai naval modernization context involving two different classes: Krabi-class corvettes and KDX-class frigates. DSME’s role was on the shipbuilding-contract side, while Boeing participated as the Harpoon-system prime contractor. The announcement does not identify individual hulls, say how many ships received Sigma 40, or distinguish completed installations from planned ones. It also does not state that all Royal Thai Navy vessels ultimately entered service with this configuration.
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According to Safran, the tests succeeded in integrating Sigma 40 with the Harpoon alignment system for the stated Thai ship program. That is meaningful: it indicates the systems could be made to work together in the tested configuration and reduces an important integration uncertainty for a combat-ship installation.
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But the public announcement is not a test report. It does not disclose test location or method, interface standards, data-bus or software details, measured alignment time, position or heading error, drift, or environmental conditions. Nor does it identify a ship hull, provide an acceptance certificate or give a final operational-acceptance date.
- It does not report a live firing. There is no stated launch, hit, range result or missile trial.
- It does not measure Harpoon performance. Seeker behavior, accuracy, lethality and missile guidance were not reported as test outcomes.
- It does not show that Sigma 40 controls the missile. The announced connection was to the missile system’s alignment function.
- It does not establish fleet-wide deployment. Safran’s broader claim about use across Thai warships is not accompanied by a public installation list.
Later product context
Safran continued to market naval inertial-navigation systems after the 2016 announcement. Its later materials describe newer, ring-laser-gyro and hemispherical-resonator-gyro product families, and claim interchangeability with Sigma 40 in relevant configurations. Those later product statements can help explain the company’s portfolio direction, but they are not specifications for the particular Sigma 40 configuration tested with Harpoon in 2016. See Safran’s naval navigation systems brochure and its 2018 announcement of a new naval INS family for that later context.
Safran also said in 2016 that Sigma 40 was installed on more than 500 warships and had accumulated more than 12 million operational hours. Those are historical company figures tied to the announcement, not current fleet totals or independent evidence about the Thai ships. Safran’s separate Euronaval 2016 material gives the operational-hours claim.
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