基于RLS算法实现激光陀螺抖动信号剥除

为了减小陀螺输出数据的时延,以满足机械抖动激光陀螺在快速跟踪中的应用,基于递归最小二乘(RLS)自适应滤波技术实现了激光陀螺抖动信号的剥除。首先对RLS自适应对消去抖算法进行了理论分析,其次通过通用串行总线接口将A/D采集的抖动反馈信号和激光陀螺计数脉冲信号传至上位机,最后基于MATLAB编写了RLS自适应程序,实现了激光陀螺抖动信号的剥除。剥除后的陀螺信号再经过11阶的有限脉冲响应滤波器和陀螺输出直接经过31阶的滤波器剩余的脉冲数基本相当,而时间延迟却明显减小。结果表明,该算法具有较快的收敛速度且能够有效去除激光陀螺计数脉冲中的抖动成分。

Dither signal removal of ring laser gyro based on RLS

In order to reduce the data delay in the ring laser gyro (RLG) and adopt it in the fast tracking application, the small delay dither signal removal method was proposed based on recursive least-squares(RLS) adaptive filter. Firstly, the theory of RLS adaptive noise cancelling was described. Secondly, the hardware was designed through which the dither feedback signal after A/D transfer and RLG readout signal could be sent to computer via universal serial bus (USB) interface. Finally, the RLS adaptive software was programmed to remove the dither signal based on MATLAB. The residual count of deprived signal filtered by an 11-order finite impulse response(FIR) filter is corresponding with that of original RLG readout signal filtered by a 31-order FIR filter, but the latency is smaller. Experiments show this algorithm has a faster convergence speed and the dither signal can be removed effectively.