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针对高速采样低通滤波的线性脉冲响应(FIR)滤波器在机械抖动激光陀螺(MDRLG)信号处理中存在着较大的时延,限制MDRLG在快速跟踪中的应用,基于相关滤波技术提出了一种新的信号处理方法。对这一方法的基本理论进行了分析,并基于Labview实现了仿真。相关滤波后,激光陀螺输出中的抖动信号衰减了约41dB,还不能达到激光陀螺应用的要求,可以适当加一低阶的FIR低通滤波器去除抖动剥除后剩余的抖动成分和高频噪声。在静态条件下用这三种信号处理方法分别对激光陀螺零偏进行了测试。相关滤波法所测得零偏稳定性(1σ00)比50阶FIR滤波器差了将近三倍,相关滤波后再经过22阶的FIR低通滤波测得的零偏稳定性比50阶FIR低通滤波器的测试结果大了不足0.001°/h,延迟时间却从4.9ms减小至2.1ms。
Linear impulse response (FIR) filter for low-pass filter with high-speed sampling has a large delay in the signal processing of mechanical dithering laser gyro (MDRLG), which limits the application of MDRLG in fast tracking. Based on the correlation filtering technique, New signal processing methods. The basic theory of this method is analyzed and the simulation is realized based on Labview. After filtering, the dithering signal in the output of the laser gyro is attenuated by about 41dB, which still can not meet the requirements of the laser gyro application. A low-order FIR low-pass filter can be added to remove the jitter components and the high frequency noise . Under static conditions, the laser gyro zero bias was tested with these three signal processing methods respectively. The bias stability (1σ00) measured by the relevant filtering method is nearly three times worse than that of the 50-order FIR filter. The correlation between the zero-offset stability of the filter after the 22-order FIR low-pass filtering and the 50-order FIR low pass The test result of the filter is less than 0.001 ° / h, while the delay time is reduced from 4.9ms to 2.1ms.