组网测速雷达覆盖地域较广,火箭飞行初始段,只有局域雷达网捕获目标,没有足够速度量测,无法独立解算弹道.本文利用测速雷达精度较低的角度量测,以交会方法先获得初步的目标位置估计作为伪定位量测,利用无迹卡尔曼滤波(UKF)将其与高精度速度量测融合对弹道进行估计.蒙特卡罗仿真表明,该方法可以弥补角度量测的精度,获得满足精度要求的弹道估计.%In the rocket propulsion stage, only a few Doppler radars can track the target due to Doppler radar networks generally cover a very large area. We could not get the accurate trajectory estimate with insufficient velocity measurements.In this paper, we propose a trajectory estimation approach based on measurements fusion. The proposed method gets a rough trajectory estimate using Doppler radar angle-measurements.The initial trajectory estimate obtained by bearing measurement intersection is taken as the pseudo-measurement.Then,the pseudo-measurements are fused with velocity measurements via unscented Kalman filter (UKF). The Monte Carlo simulation results show that the proposed approach can compensate the accuracy of bearing-only measurement, and improve the track estimation.
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