为了提高临近空间高超声速滑翔目标在地心地固(ECEF)坐标系下地理位置的跟踪精度,基于目标的三自由度弹道方程对其轨迹进行分析,提出将轨迹投影到高度,经度,纬度三个坐标方向,在高度方向的轨迹衰减震荡,将加速度描述为零均值的正弦衰减震荡自相关随机过程,构造了一个位置滤波器,在经度和纬度方向的轨迹线性偏移,将角度的变化率描述为零均值的指数自相关随机过程,构造了两个角度子滤波器,将三个滤波器并行运行以实现目标的三维跟踪,仿真表明该算法具有较好的跟踪精度。

In order to improve the tracking accuracy of geographic location in ECEF coordinate system, the trajectory characteristic of the target is analyzed based on the three-degree-of-freedom equations. The trajectory is proposed to be projected to three coordinate directions. The height decays and oscillates, so the acceleration is proposed to be described as a sinusoidal attenuation oscillation autocorrelation stochastic process with zero mean and a position filter is constructed. The latitude and longitude deflect linearly, so the change rates of angles are proposed to be described as exponential autocorrelation stochastic processes with zero mean and two angle filters are constructed. Those three filters are conducted in parallel to achieve the 3D tracking. Simulation shows the algorithm has a good tracking accuracy.

V249.1