一种海杂波中的波形捷变目标跟踪算法

Algorithm for tracking target with waveform agile in sea clutter

为了减小强海杂波环境下雷达对单个目标的跟踪误差,提高雷达跟踪精度和稳定性,提出了一种波形捷变目标跟踪算法。假设目标处于由复合高斯模型海杂波引起的低信杂比(SCR)环境中,其观测模型为线性,在目标跟踪过程中,首先发射线性调频(LFM)信号以估计目标区域杂波统计特性,再利用子空间映射方法对杂波进行抑制;然后根据杂波统计特性,以最小化均方跟踪误差(MSE)为准则,动态设计雷达下一次所要发射的相位调制(PM)波形,以提高目标区域SCR,从而提高雷达对目标的跟踪性能。仿真实例表明:该算法能有效减小雷达均方跟踪误差。

To decrease the error of radar tracking a single target in the heavy sea clutter environment, improve the radar tracking accuracy and stability, an algorithm for tracking a target with waveform agile was proposed. Assuming the target moves in a sea clutter environment with low signal clutter ra- tio （SCR） caused by the compound Gauss model, its observation model is linear. In the target tra- cking process, it transmits a linear frequency modulation （LFM） waveform to estimate the clutter sta- tistics in the target area, and then suppresses the clutter with a subspace mapping method. According to the clutter statistics, a phase modulation （PM） waveform to be transmitted next by radar is adop- tively designed based on the criterion of the minimal mean square error （MSE） of target tracking so as to improve SCR in the target area and the tracking performance of radar. A simulation example shows that this algorithm can effectively decrease the MSE of radar tracking.