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TTI - Royal Thai Navy Selects Mk 31 AHRS

TTI (Europe) : 13 September, 2007  (Application Story)
Royal Thai Navy Chooses SG Brown Attitude and Heading Reference System
The Royal Thai Navy has taken delivery of an S G Brown Mk31 AHRS (Attitude and Heading Reference System) from TSS International Ltd. The new system will replace an ageing Sperry Mk 29 mechanical AHRS aboard the Witthayakon fast attack craft. The Sperry Mk 29 is in widespread use with navies around the world but is no longer supported by its manufacturer and is consequently very expensive to maintain. The Thai Navy consequently needed to replace it with a modern AHRS that could still interface with the gunnery fire control, Exocet missile launch and Navigation Systems aboard the 30 year-old boat. If this had not been possible, the service life of the vessel would have been significantly reduced.

The S G Brown Mk 31 AHRS supplied to the Royal Thai Navy was manufactured at the TSS International Ltd factory in Watford, UK. It incorporates a high performance ring laser gyro and provides inertial measurement and heading reference with very fast follow-up and will be interfaced to the vessel's gunnery fire control and navigation systems. The full S G Brown system delivered included the AHRS inertial measurement unit, a control display unit, a re-transmission unit, an uninterruptable power supply and repeaters.

For the Thai Navy, the re-transmission unit (RTU) was possibly one of the most important features of the Mk 31 AHRS. This is because S G Brown engineers are possibly unique in their ability to adapt their product to the needs of the customer. They were able to design and manufacture interfaces between the modern Mk31 AHRS and the older and diverse analogue systems in existence aboard the vessel at only marginal additional cost. If this had not been possible the Thai Navy would have been faced with the prospect of either replacing many of the older systems or, if this was not practical, scrapping the boat altogether.

The S G Brown Mk31 chosen by the Royal Thai Navy can be used to replace almost any type of mechanical AHRS. The company has over 25 years experience in providing interface solutions for naval equipment and this enables its systems be interfaced with a wide range of on-board equipment. The Mk 31 can be tailored to provide motion data and gyro-headings to electronic systems of almost any age and manufacture. Electronic charts, radars and fire control can all draw their essential data from the S G Brown AHRS which is accurate to 6 arc mins for heading, and 1.5 arc mins for roll and pitch. The use of solid-state ring laser gyro technology is also known to be an attractive feature for the operators of combat vessels as it combines reliability and low running costs with a fast settling time.
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