结合纯方位目标追踪的视线角速率提取方法

LOS rate extraction method based on bearings-only tracking

针对捷联导引头视线角速率提取过程中弹目相对距离和相对距离变化率未知的问题,提出了一种针对地面目标的结合纯方位追踪滤波的视线角速率提取方法。首先使用纯方位目标追踪滤波估计出相对距离和相对速度,然后把估计结果用于视线角速率估计模型以完成发射系视线角速率的估计。基于误差传播规律,仿真分析了导弹的姿态误差、发射系Y向速度误差、高程误差以及捷联导引头体视线角误差对发射系视线角速率估计误差的影响,仿真结果表明弹体俯仰角误差和滚转角误差对视线角速率估计误差的影响最明显。最后使用蒙特卡洛方法对目标机动及非高斯噪声情况下角速率提取精度进行了仿真验证,蒙特卡洛结果表明所提方法的视线方位角速率和高低角速率估计误差均值分别为α-β滤波的13.0%和18.2%;均方根误差均值分别为α-β滤波的18.8%和24.2%。

In response to the challenge of acquiring relative distance and its rate between missile and target in the process of extracting the line of sight(LOS)angle rate using strapdown seeker,a LOS rate extraction method based on bearings-only tracking for engaging ground targets is proposed.Firstly,the relative range and relative velocity are estimated by using the bearings-only target tracking filter,and then the estimated results are employed in the LOS angle rate extraction filtering to estimate the LOS angle rate of the launching system.Based on the error propagation law,the impacts of missile attitude error,Y-direction velocity error,altitude error and strapdown seeker body-LOS angle error on the estimation accuracy of LOS angle rate of the launching system are simulated and analyzed.The simulation results show that the errors in pitch and roll angles of the projectile have the most significant influence on the estimation errors of the LOS angle rate.Finally,the Monte Carlo method is used to verify the accuracy of angle rate extraction under target maneuvering and non-Gaussian noise.Monte Carlo results indicate that the mean estimation errors of the proposed method in terms of LOS rate for azimuthal and elevation angles are 13.0%and 18.2%of the alpha-beta filter,respectively.The mean root-mean-square errors are 18.8%and 24.2%of the alpha-beta filter,respectively.