无源相干定位系统中的淹没效应及其消除

Elimination of masking effects in a passive coherent location system

针对无源相干定位系统中的淹没效应进行研究,分析了无源相干定位系统接收信号的组成及处理方法,对PCL系统在远距离、微弱目标回波信号被近处强的回波信号掩盖时的性能进行了研究.提出采用ECCC方法估计目标的位置,通过估计目标强回波的幅度、TDOA和多普勒频率,用自适应对消的方法从接收到的信号中对强回波进行抑制.所陈述的方法通过自适应提升了PCL在距离域上的性能.仿真证明了该方法的有效性.

The authors researched masking effects in a passive coherent location （PCL） system. The composition of the system and its processing methods were analyzed. The PCL system＇scapability was studied when a distant, feeble target echo signal is masked by an adjacent forceful echo signal. The authors put forward a technique for estimating the position of the target by the extended cyclic cross-correlation （ECCC） method. It estimates the target＇s potential echo strength, time difference of arrival （TDOA）, Doppler frequency shift and separates the strong echo from the distant signal by the adaptive cancellation method. The proposed method improves PLC＇s capability in distant domains through adaptive implementation. Results of computer simulations demonstrated the validity of this method.