基于天文辅助的弹载双惯组空中传递对准方案

CNS-Aided Transfer Alignment Scheme for Missile-Borne Double SIMU

提出一种基于天文辅助的弹载双惯组空中传递对准方案。针对弹道导弹大部分时间飞行在大气层外的特点,引入天文导航系统对主INS进行辅助,使得主INS能长时间保持在较高精度;在充分考虑弹体挠曲变形的情况下,建立了双惯组空中传递对准模型。根据模型中各状态量的可观测程度分析结果,得到原有传递对准模型的降阶模型。采用"姿态+速度"匹配算法,估算和补偿了子INS导航参数误差以及器件误差。仿真结果表明,提出的对准方案不仅能长时间保证主INS精度,还可以有效改善子INS的对准精度。

A CNS-aided transfer alignment scheme for missile-borne double SIMU is proposed. For the ballistic missile flies above the atmosphere most of the time,CNS is introduced to assist master INS, so that master INS can maintain high accuracy for a long time. Taking the flexure deformation into consid-eration, a high precise transfer alignment mathematic model for double SIMU is established. According to the observability degree analysis results of each state in the model, a reduced-dimension model is got. Based on the proposed transfer alignment model, attitude ＋ velocity matching method is employed to es-timate and compensate the errors of slave INS navigation parameters and inertial equipments. Simulation results demonstrate that,the proposed transfer alignment scheme can not only guarantee the high accuracy of master INS,but also improve the alignment precision of slave INS.