CAJ | 학술논문

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(σ_(100))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.
침대고속채양저통려파적선성맥충향응(FIR)려파기재궤계두동격광타라(MDRLG)신호처리중존재착교대적시연,한제MDRLG재쾌속근종중적응용,기우상관려파기술제출료일충신적신호처리방법.대저일방법적기본이론진행료분석,병기우Labview실현료방진.상관려파후,격광타라수출중적두동신호쇠감료약41dB,환불능체도격광타라응용적요구,가이괄당가일저계적FIR저통려파기거제두동박제후잉여적두동성분화고빈조성.재정태조건하용저삼충신호처리방법분별대격광타라령편진행료측시.상관려파법소측득령편은정성(σ_(100))비50계FIR려파기차료장근삼배,상관려파후재경과22계적FIR저통려파측득적령편은정성비50계FIR저통려파기적측시결과대료불족0.001°/h,연지시간각종4.9ms감소지2.1ms.
The common method to remove the dither signal of the Mechanically Dithered Ring Laser Gyro (MDRLG) at present is to design a Finite Impulse Response (FIR) low pass digital filter. The order and the delay time of the FIR filter will be much high to achieve well performance, which limits the use of the MDRLG in fast tracking inertial navigation system (LINS). A new signal processing method based on correlate filter is proposed. The basic theory is analyzed. The simulation is realized based on Labview. Tests show that dither signal can be attenuated 41dB by this method. The residual dither signal and high frequency noise can be removed by 22-order low pass filter. In room temperature and static state, null drift stability tests are performed. The test results indicate that a hundred second root-mean-square (σ_(100)) of measured null drift value tested with dither stripper is three times of that tested with 50-order FIR low pass filter .The σ_(100) tested with dither stripper plus 22-order FIR low-pass filter is only 0.001°/h larger than that of 50-order FIR low pass filter,but the delay time can be reduced from 4.9ms to 2.1ms.