改进的斜投影极化滤波方法

摘要

针对脉冲体制雷达抗干扰的需求,综合利用卡尔曼滤波技术、斜投影极化滤波技术和时域对消技术,研究了一种改进的斜投影极化抗干扰方法.首先利用卡尔曼滤波技术估计干扰的极化状态参数,在目标极化状态未知的情况下求得斜投影算子,再利用求得的斜投影算子提取出干扰信号,然后利用时域对消技术将原始信号减去干扰信号即得到纯净的目标信号.仿真结果表明,卡尔曼滤波技术可快速准确地估计出干扰极化参数,改进的斜投影极化滤波方法可大幅度抑制干扰,并保持了目标信号的幅度和相位不变性.%In order to meet the anti-jamming requirement of pulse radar,an improved oblique projecting polarization anti-jamming method is studied by the full use of Kalman filtering technique, oblique projecting polarization filtering technique and time-domain cancellation technique.Firstly,jamming signal' s polarization parameters is estimated by Kalman filtering technique, and oblique projection operator is calculated while target's polarization parameters are unknown; secondly, using the calculated oblique projection operator,jamming signal from extracted;finally,pure targets'signal is obtained by subtracting original signal.Simulation results show that Kalman filtering technique can estimate jamming signal's polarization parameters quickly and accurately; so the improved oblique projecting polarization filtering method can suppress jamming greatly and maintain target signal's amplitude and phase.