一种制导炸弹MINS／GPS导航系统误差分析与分配

Errors analysis and allocation of MINS/GPS system in guided bomb

研究了对准误差和惯性敏感器主要误差对制导炸弹捷联惯导位置误差的影响,并从捷联惯导位置导航精度要求反推出对准误差和微机械惯性敏感器工具误差的分配原则和方法。分析了微机械陀螺和微机械加速度计的误差模型,并说明在短时间工作过程中均可简化为零偏叠加随机噪声。捷联惯导系统误差模型研究和弹道仿真表明,水平姿态对准误差和惯性敏感器零偏是制导炸弹惯导误差的主要误差源,用GPS辅助的组合导航可对所有主要误差源的误差进行估计并补偿。根据理论分析和仿真结果,以及误差源的误差和系统导航位置误差存在的正比关系,分析了MINS/GPS制导炸弹捷联导航的误差分配原则和方法,并给出了误差分配样例。

The relations between the alignment errors or the major inertial sensor errors and the strapdown inertial navigation system （SINS） position errors of guided bomb were studied, and the allocation principles and methods of the errors were deduced from the SINS precision requirement. The error models of micro-machined gyro and accelerometer were studied and simplified to bias stacking noise in short time. The study of SINS models and the simulation of a bomb trajectory show that the level attitude errors and the inertial sensor errors are principle error sources of guided bomb SINS, and the GPS aided integration navigation can estimate and compensate all principle errors. Based on the theory analysis, the simulation and the proportion relation between principle error sources and SINS position errors, the error allocation principles and methods of the MINS/GPS guided bomb were analyzed, and several error allocation samples were listed in the end.