机载武器极区传递对准算法

Airborne weapon transfer alignment algorithm in polar regions

针对高纬度地区经线收敛导致以真北向作为航向参考的导航算法失效的问题,并结合战机在极区内具备正常导航和作战能力的需求,提出了基于格网导航力学编排的极区传递对准算法。首先以格林威治子午线作为航向参考,在此基础上定义了格网导航坐标系同时给出了格网导航力学编排及其误差方程,解决了极区内相对经线定向定位困难的问题。其次在格网导航坐标系下设计了主子惯导信息的"速度+姿态"匹配传递对准算法,估计和校正弹载子惯导的误差。仿真结果表明,该算法可避免载机进行费时的方位机动,仅需一次简单的摇翼机动就可令弹载惯导5 s内方位对准精度达到5',为战机在极区内仍具有导弹攻击能力提供了工程应用参考。

A new transfer alignment algorithm was presented for normal navigating and campaigning of military aircraft in polar regions. The rapid convergence of the Earth＇s meridians makes it difficult to establish true heading at high latitudes. To solve the problem, a grid technique was employed, and the grid mechanization equations and error equations were derived by using the technique. A velocity plus position matching Kalman filter was designed to estimate and correct the slave inertial navigation system＇s velocity, attitude and inertial sensor errors. Simulation results show that the algorithm could achieve 5＇ alignment accuracy in less than 5 s by only requiring a brief wing-rock maneuver without time-consuming heading changes, and provide a combat capability for military aircraft in polar regions.