严格逆向过程的捷联惯导快速回溯对准

回溯对准是利用高性能计算机反复进行正向和逆向导航解算来实现惯导系统的初始对准。对捷联惯导系统回溯参数辨识对准技术进行了研究，首次将严格逆向过程用在常规回溯对准中，其逆向过程不采用常规的近似解算，而是严格由正向过程的终点递推至起点，这可有效缩短惯导姿态失准角的估计时间，从而可相应提高捷联惯导在相同对准精度下的对准速度。最后，利用光纤陀螺捷联惯导系统进行了离线对准试验。结果表明，该对准方法的对准时间比常规回溯对准法缩短了1/3以上，证明了该对准方法的正确性、可行性。

Fast Backtracking Scheme for Alignment with Strict Reverse Process Based on SINS

The backtracking alignment can realize the initial alignment of strapdown inertia navigation system(SINS) through the high-performance computer which repeatedly proceeds the forward and backward navigation calculating. The backtracking parameter identification alignment method of SINS is investigated in this paper, and the process of strict reverse navigation is applied in regular backtracking alignment method on first. In the method, the calculating based on reverse process is not approximated. The reverse process is strict process derived from the end to the beginning, and can decrease the estimated time of attitudes misalignment angle. So it can advance the speed of SINS in the same accuracy. Through offline alignment test of FOG SINS, finally the alignment method in this paper is a third faster than regular method, and it is proved correct and feasible.