惯导系统摇摆扰动基座对准技术

Research for INS Alignment on a Swaying Base

摇摆扰动基座上惯导系统初始对准扰动干扰信号强度较大,有用量测信号强度小,系统信噪比弱,对准过程滤波收敛慢。为提高惯导系统在摇摆扰动基座上的对准精度及对准快速性,设计了基于马尔科夫递推滤波参数估计的对准方案,通过开路粗对准及闭路精对准,实现游移方位惯导系统在扰动基座上的平台调平、航向确定及陀螺漂移测定,试验结果表明,所设计的方案达到了较好的效果。

When Inertial Navigation System carries through alignment process on a swaying base, the disturbance signal is stronger than the useful signal and the system＇s S/N ratio is very low, so the convergence time of alignment process is long. In order to improve the alignment accuracy and reduce the alignment time, this paper brings forward a new approach based on parameters estimation by means of Markov recursive filter. The wander azimuth INS platform realizes adjustment of level axis, confirmation of heading direction and detection of gyro drift through open-loop coarse alignment and closed-loop fine alignment. The test results show that a high-precision alignment and a reduced alignment time have been obtained by means of this new method.