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为提高地面激光瞄准系统对运动目标的瞄准精度,研究了目标的运动特性,并对不同提前量算法的计算精度进行分析。从航天器和天体的运动规律出发,建立一种基于双行根数(TLE)星历表的地平坐标系下的航天器轨道动力学模型,研究了航天器在地平坐标系下斜距、角度、角速度、角加速度的变化规律;根据理论轨道数据,分析了激光瞄准系统的一、二阶瞄准提前量的变化规律;针对实际非时间连续系统,分别用后向差分法和中心差分法对提前量进行误差分析。研究结果表明,目标的角速度、角加速度及急动度等高阶项均对瞄准提前量有直接影响,中心差分提前量算法更具优势。
In order to improve the aiming accuracy of the laser target aiming at the moving target, the motion characteristics of the target are studied, and the calculation accuracy of the different advanced algorithms is analyzed. Based on the laws of motion of the spacecraft and celestial bodies, a spacecraft orbit dynamics model based on two-line root-mean-square (TLE) ephemeris was established. The spacecraft orbit dynamics under the horizontal coordinate system , Angular velocity and angular acceleration. According to the theoretical orbit data, the variation law of the first and second order aiming advance of the laser aiming system is analyzed. For the actual non-time continuous system, the backward difference method and the center difference method The amount of error analysis. The results show that all the higher-order items, such as the angular velocity, angular acceleration and jerkiness of the target, have a direct impact on the aiming advance, and the center differential advance algorithm has more advantages.