为提高机载光电吊舱进行目标定位的精度,研究吊舱的设备测量误差对目标定位精度的影响,推导了目标定位方程,并建立了目标定位的扩展卡尔曼滤波(EKF)模型。通过在Matlab/Simulink中进行仿真,定量分析了吊舱的测距误差、高低角和方位角误差对目标定位精度的影响。结果表明定位误差可以在2s的时间收敛到5m,提高了定位精度和收敛速度;分析测量误差对定位精度的影响,可为吊舱的精度分配或改进提供理论依据。

In order to improve precision of target geolocation of airborne electro-optical pod and study the effects of pod measurement errors on target geolocation, the equation of target geolocation was derived. Extended Kalman filter model of target locating was established and simulated in Matlab/Simulink. The effects of ranging error, elevation angle error and azimuth angle error on target location accuracy were analyzed quantitatively. The simulation results showed that the target location error could be weakened to 5 m in 2 s and the positioning accuracy and convergence speed were improved. Analysis of the influence of measurement errors on positioning accuracy could also provide theoretical basis for accuracy allocation or improvement of instruments of airborne pod.