四频差动激光陀螺三种误差模型对寻北精度的影响

分析了四频差动激光陀螺漂移信号的特性,将陀螺输出的漂移误差信号分为常值漂移误差和随时间变化的一次项、二次项漂移误差,并据此建立陀螺漂移误差模型,分别对陀螺漂移进行零次拟合、一次拟合及二次拟合.针对这些模型结合寻北推导了误差的补偿算法,并通过寻北实验精度比较,验证了不同误差模型的补偿效果.实验结果表明,就本文实验所用陀螺,含二次项误差的模型寻北精度较高,使寻北精度从零次拟合模型的1密位降低到0.5密位.

Effect of three error models on north-seeking precision for differential laser gyro with four frequencies

The paper analyzed the characteristics of drift-error signals of four-frequency differential laser gyro, and divided the signal into time-invariable drift, time-variable one-order and time-variable two-order drift errors. Based on this, three error models were established, which made zero-order, first-order and second-order fitting for the gyro's drift. The compensatory algorithms for the model's errors were derived in connection with north-seeking, and the north-seeking experiments were carried out to testify and compare their precisions. The result shows that the third model can acquire higher precision when using the above gyro to seek north, improving from 1 mil by zero-order fitting model to 0.5 mil by second-order fitting model.