基于遗忘因子RLS算法的自适应直达波对消技术

在以民用广播、电视及CDMA等信号为照射源的无源雷达系统中,由于发射信号为连续波信号,直达波和多径信号对雷达回波的干扰很强,影响了目标的检测。为此采用RLS自适应对消处理技术来抑制直达波干扰,针对RLS自适应算法的性能分析,提出了改进RLS自适应处理算法,收到了良好的滤波效果。最后在以广播信号为照射源的实验系统中,根据实际采集的数据进行仿真论证,验证了该方法的可行性。

Adaptive Canceling Technique of Direct Arrival Signal Based on the Forgetting Factor RLS Algorithm

In the passive radarsystem using a FM、TVand CDMA as radiant point,the radar echois greatly restrained by the direct arrival signaland multipath signal due to the continuous-wave signal,which influences the target detection performance. The recursive least square（ RLS） adaptive processing method is adopted to restrain the effects ofthese clutters. The capabilities of RLS are analyzed,animproved RLS adaptive processing algorithm is given,and the efficacy of the method is demonstrated. Finally,an experimental system is discussed by regarding FM broadcast transmitter asnon-cooperative illuminator. Simulation results by real collected data show that the application of these methodsenables better performance in target detection.