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Volume 42 Issue 9
Sep.  2016
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Journal of Beijing University of Aeronautics and Astronautics  > 2016  >  42(9): 1836-1842.
PAN Xiong, HUANG Yuqiong, ZHANG Shaobo, et al. Simulation and analysis of data frequency mixing errors in IMU based on FOG[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(9): 1836-1842. doi: 10.13700/j.bh.1001-5965.2015.0544(in Chinese)
Citation: PAN Xiong, HUANG Yuqiong, ZHANG Shaobo, et al. Simulation and analysis of data frequency mixing errors in IMU based on FOG[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(9): 1836-1842. doi: 10.13700/j.bh.1001-5965.2015.0544(in Chinese)
shu

Simulation and analysis of data frequency mixing errors in IMU based on FOG

doi: 10.13700/j.bh.1001-5965.2015.0544

  • School of Instrumentation Science and Opto-electronics Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

  • Received Date: 24 Aug 2015
  • Publish Date: 20 Sep 2016
    Abstract
  • The asynchronous resampling of fiber optic gyroscope (FOG) output data by navigation computer can cause frequency mixing errors. Based on the characteristics of FOG signal detection, a simulation model was established using the update rate of FOG closed-loop output and the resampling frequency of inertial measurement unit (IMU) as parameters, the sinusoidal noise frequency of vehicle as a variable, and the decrease of signal direct current (DC) amplitude error received by navigation computer as the target. The frequency mixing errors and delay characteristics of interpolation and decimation scheme and sliding filter scheme were analyzed. A variable sliding window length scheme was proposed and the sensitivity of error response spectrum to sliding window length was suppressed. The simulation results show that the maximum error of the variable sliding window length scheme is reduced from 0.056 85 to 0.009 737 compared with the sliding filter scheme with sliding window length's deviation from the optimal value of 4%. Besides, the proposed scheme can better accommodate the engineering requirement of timing pulse frequency dithering or switch.

     

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