光纤陀螺时滞环节的实时补偿技术

Real-time Compensation Technology of Time Delay Unit of Fiber Optic Gyro

光纤陀螺已广泛应用于光电跟瞄设备的稳定回路,但其内部信号处理和传输延迟所造成的时滞环节却对稳定回路可实现的带宽设置了约束条件。在比较了有限记忆滤波、卡尔曼滤波和最小二乘法三种补偿方法基础上,采用最小二乘法对光纤陀螺的测量输出进行预测用以补偿其时滞环节。针对光纤陀螺测量要求和时滞特性,分析了影响补偿精度的因素,试验了不同的最小二乘法拟合多项式次数的补偿结果。实验结果表明,采用5点4次外推2点的最小二乘法即能在200Hz的频率范围内,使光纤陀螺的时滞环节得到较好的补偿。

Fiber Optic Gyro （FOG） has been widely applied in stabilization loop of electro-optical tracking and pointing system, but the time delay unit caused by signal processing and transfer delay in FOG constraints the bandwidth of stabilization loop. On the basis of comparisons among limited memory filter, Kalman filter and least square method, least square method is adopted to forecast the measurement output of FOG, which compensates its time delay unit. In light of the measurement requirement of FOG and characteristics of time delay, factors affecting compensation accuracy are analyzed, and the degree of polynomial fitting of different least square method is tested. The result shows that the time delay unit of FOG can be well compensated by using the least square method of five-point and four-degree extrapolating two points in the frequency range below 200 Hz.