为了实现对弹丸GPS信号的快速捕获,分别采用星历和射击诸元实时计算卫星和弹丸的相对位置和相对速度,并通过坐标转换统一到WGS-84坐标系下,根据矢量点积的概念求解出卫星和弹丸相对运动产生的多普勒频移,实现极高速载体的快速定位。误差分析表明,即使在最恶劣的情况下,多普勒频移的预估误差也不超过500Hz,在捕获误差范围内。

To quickly capture the GPS signal of projectile, Using the star calendar and fringe date to calculation the relative position and relative speed of the satellite and projectile, and then transitioning them into the same coordinate of WGS-84, according to the concept of vector dot product to estimate the Doppler frequency shift, realized rapid positioning of hypervelocity carrier. Error analysis demonstrates that the estimated error can be restricted to 500 Hz even in the worst cases, which within the scope of capture.