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Vertical Reference Unit with Closed-Loop Fiber Optic Gyros, Servo Accelerometers and integrated Strapdown Processor

With iVRU-FCAI a vertical reference unit / IMU is provided for applications which require high accuracy and simple using.


  •  Three rate gyros and three accelerometers (+/- 1'000 deg/s, 2 or 5 or 10 or 20 g)
  • < 0.03 deg/hr bias stability (const. temp) and 1 deg/hr over temperature range (OTR)
  • high shock resistance due to FOG technology
  • CAN / RS232 / RS422 interfaces (options)
  • Sync Input / Trigger Output available
  • Integrated L1 GPS receiver as option (or external GPS engine)
  • Odometer interface as option
  • Navigation and Guidance

iVRU-FCAI is a triaxial system with three orthogonal mounted rugged fiber optic gyroscopes, three ultra ruggedised servo accelerometers and an integrated powerful micro-processor with 24/32 bit sensor data digitalisation to provide digital data transmission (CAN, RS232, RS422) and extended internal error modelling. As a further optionan internal GPS / magnetometer can be provided as well as a speed sensor interface to achieve higher performance also in difficult environment. Interfaces for platform stabilisation are available on request.

With iVRU-FCAI-E an export version is available with lower rate range - for the standard unit with 1'000 deg/s rate range an export license is require if the unit shall be used outside the EU.

With iVRU-FQ a version with lower is available.