基于分数迟延估计的外辐射源雷达杂波相消算法

External illuminator based continuous wave radar clutter canceling algorithm using arrival time estimation by fractional interpolation

在利用外辐射源构成的收发分置连续波雷达系统中,直达波及多径杂波严重地影响了雷达对运动目标的探测性能.针对这一问题,通过对直达波及多径反射杂波的到达时间进行分数插值估计,提出了一种连续波雷达杂波相消算法.该算法利用参考接收通道的输出信号作多时延的分数内插估计来进行自适应杂波对消.基于实测数据的处理结果表明所提算法能获得平均45dB的检测增益,有效地改善了系统对运动目标的检测性能.

The detecting performance of the external illuminator base bistatistic continuous wave radar system is greatly influenced by the direct signal and the multipath reflected clutter received by the main receiving channel. This paper presents an effective external illuminator based bistatistic continuous wave radar clutter canceling algorithm to overcome the problem. The presented algorithm employs the auxiliary receiving channel reference signal to adaptively cancel the direct signal and multipath reflected clutter by using the fractional interpolated arrival time interval of such clutters. Experimental results on real collected data show the method improves the detecting performance for a moving target by offering an average detection gain of about 45 dB.