Novel Medium-accuracy MEMS INS "AIST-320" - Building Comfort Enviroment for Sensors

Oleg Mezentsev, Evgeny Frolov, Mihail Klimkin, and Alexander Mezentsev

Abstract:	The paper presents results of design, production and testing of a novel medium-accuracy MEMS INS AIST- 320. The system is build around a newly developed Coriolis vibratory gyro AIST-100. The structure of the gyro, schematics of the excitation and pick-off loops are presented. Special aspects of the gyro manufacturing, such as dynamic frame balancing, feedback loops and gyro natural frequency tuning, are also discussed. The INS has several key features – a thermo-stabilization and vibration isolation subsystems, that are usually used in traditional inertial systems, are implemented to give significant system accuracy improvements: the gyro bias in-run stability is better than 10 deg/hour with low noise. The sensors are all put into a sensor module that is kept heated to a constant working temperature (within 0.1°C) leaving a margin for heat sinking at maximum allowable outside temperature of 50°C. Another key feature of this subsystem is the ability of forsage or speed-up heating. Such mode consumes more power but provides a possibility of heating a sensor module from -40°C to an operating point, the temperature that guarantees the accuracy specification, in just above 5 minutes. The vibration isolation subsystem is mainly build to create a comfort vibration environment for vibratory gyros AIST-100. The vibration subsystem is made with natural frequency near 125 Hz, when the AIST-100 natural frequency is near 500 Hz. This subsystem is made of steel and rubber and is nearly equally rigid and stable in all three input axes. The test results are given for a range of input temperatures and rotation rates in a form of Allan variance analysis. Due to modular electronics configuration used in the system, this INS is perfectly suited for all kinds of GNSS integration from loose to deep-coupling – interface module can easily and quickly be adjusted to customer needs. The INS AIST-320 and vibratory gyro AIST-100 are low-cost, reliable, medium-accuracy, easy to manufacture and assemble units designed for massproduction.
Published in:	Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007) September 25 - 28, 2007 Fort Worth Convention Center Fort Worth, TX
Pages:	1335 - 1344
Cite this article:	Mezentsev, Oleg, Frolov, Evgeny, Klimkin, Mihail, Mezentsev, Alexander, "Novel Medium-accuracy MEMS INS "AIST-320" - Building Comfort Enviroment for Sensors," Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007), Fort Worth, TX, September 2007, pp. 1335-1344.
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