Lock-In Amplifier Technology in Laser Gyroscope North Finder of Constant Rate Biasing

Bin Wang, Wei Zhang, Zhanqing Wang and Peihao Zhu

Mathematical Problems in Engineering, 2013, vol. 2013, 1-11

Abstract:

This paper presents a new type of strapdown north finder. A simplified configuration is proposed, including three parts: a pendulous force-feedback accelerometer, a ring laser gyroscope, and a single-axis rotating platform. The dynamic northfinding scheme of continuous rotation is adopted to eliminate the lock-in region of the laser gyroscope and to modulate the weak attitude signals; meanwhile the complex leveling process is avoided in this proposed configuration. To suppress the drift noises of the accelerometer and gyroscope, two digital lock-in amplifiers are used to extract the weak attitude signals. Simulation results show that the north finder can determine the heading angle in 72 s, when the rotating rate is /s with the maximum heading error less than 1.0′; meanwhile the horizontal attitude angles as well as the constant drift noises of the inertial components could also be obtained.

Date: 2013
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Persistent link: https://EconPapers.repec.org/RePEc:hin:jnlmpe:856803

DOI: 10.1155/2013/856803

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