环形激光陀螺随机误差测试中的计数误差

Countering error in random error test of ring laser gyro

详细讨论了环形激光陀螺(RLG)误差测试中的计数误差。首先提出了在角度随机游走为主要误差源的情况下,RLG的离散输出模型。在假设累积角度量化误差为白噪声的前提下推导了方差(或Allan方差)分析中的量化误差模型。接着指出白噪声假设并不总能成立,特别是对于由计数器只能计整数引致的量化误差(特称为“计数误差”),由于量化间隔很大,这一假设通常不能成立。最后,给出了一种白噪声假设不能成立时的处理方法及仿真数据分析结果。

The countering error in the test of ring laser gyro （RLG） is discussed in detail. The discrete output model of the RLG is put forward when random walk is the main error source, and the quantization error model in the variance （or Allan variance） method is deduced on the hypothesis that the quantization error can be treated as white noise. But the hypothesis is not always valid especially for the countering error induced by the RLG counter with only integer outputs where the quantization level is rather large. A method dealing with the data where the hypothesis is not valid is exposed at the end of this paper with some simulation data.