中文说明：基于粒子滤波的雷达检测前跟踪算法，建立新的目标模型和观测模型，提出了线性扩展目标。能够检测1db的弱小目标。
English Description：
Based on the particle filter tracking algorithm before detection, a new target model and observation model are established, and a linear extended target is proposed. It can detect 1 dB dim target.