平台式惯导系统三点校的常值误差解析

为估计和补偿各种误差源引起的综合校正误差,针对平台式惯导系统综合校正中的三点校,从理论上分析了外界测量信息误差和惯性平台水平误差对陀螺常值漂移综合校正效果的影响,并对受外界测量信息误差影响的三点校过程进行仿真。研究结果表明:"三点校"对陀螺常值漂移的估计误差,与重调时刻的量测误差、惯性平台水平失调角均呈线性关系,提高外界测量信息和惯性平台水平测量精度,是提高三点校精度的关键。

Constant error analysis of gimbaled INS in three-point comprehensive calibration

The influence caused by exoteric information error and platform horizontal error in two-point comprehens-ive calibration was studied in theory. The relation between maximum value of gyro drift error and calibration intervals was derived. It also represented the simulation of three-point calibration affected by exoteric information error. The study result shows that these two kinds of error are both linear with the estimation error of the constant gyro drift. In order to treat it as a high precision approach of calibration, it is important to increase the exoteric information precision and platform horizontal accuracy efficiently.