雷达微弱目标探测的改进检测前跟踪算法

A Modified Track-before-Detect Algorithm for Radar Weak Target

针对基于Hough变换的检测前跟踪(TBD)算法存在大量虚假航迹,无法有效得到真实目标航迹的缺点,提出了一种基于修正Hough变换和粒子滤波相结合的TBD算法。该算法首先利用修正Hough变换估计目标航迹,得到目标可能存在的范围;再将该范围作为粒子滤波的先验信息,利用粒子滤波计算的权重构造似然比检测目标,进一步剔除虚假航迹,宣布检测结果的同时给出目标真实航迹。仿真实验表明,该算法能实现对雷达微弱目标的精确检测和跟踪。

A novel track-before-deflect （TBD） algorithm based on Modified Hough Transform （MHT） and Particle Filter （PF） is proposed to solve the shortcomings that the real target trajectories cannot be obtained for many false trajectories existing in the TBD algorithm based on Hough Transform. Firstly, possible trajectories are initiated by the MHT to obtain the region of location of the target, then this region as the prior knowledge is provided to the PF and the likelihood function is established for target detection by the weights which are calculated by the PF, at last the false trajectories are eliminated and the real target trajectories are given with detection results. Simulation results show the presented algorithm can implement accurate tracking and detection weak target.