基于SVM-UPF的雷达弱小目标检测前跟踪算法

针对低信噪比条件下雷达弱小目标的检测与跟踪,提出了基于支持向量机和无迹粒子滤波的检测前跟踪算法。该算法采用无迹卡尔曼滤波生成粒子滤波的重要性密度函数,提高了粒子的使用效率,在此基础上将支持向量机引入到粒子重采样步骤中,通过构建状态的后验概率密度函数来获得多样性的新粒子,有效解决了粒子贫化问题,仿真结果表明,该算法提高了目标的检测概率和跟踪精度。

Track-before-Detect Algorithm for Radar Weak Target Based on Support Vector Machines Unscented Particle Filter

An improved Track-Before-Detect (TBD)algorithm based on support vector machines and unscented particle filter is proposed for weak target detection and tracking in low Signal to Noise Radio (SNR)environment. The improved algorithm uses the Unscented Kalman filter to generate the important proposal distribution which can match the true posterior distribution more closely. On this basis,the article introduces support vector machines into particle resampling. By building the posterior probability density model of the states,diversiform particles can be gained. And the impoverishment problem is solved effectively by these diversiform particles. The simulation results show that the improved algorithm can improve probability of detection and tracking accuracy.