外辐射源雷达系统具有隐蔽性好、反隐身能力及简单可靠等优点，近年来受到更多的重视。但在实际应用中直达波、多径信号及同频等杂波信号严重削弱了该体制雷达的探测性能，限制了其应用。该文分析了基于数字阵列体制下以调频广播信号为照射源的无源雷达，提出了空域自适应处理方法来抑制杂波信号，检测到杂波抑制前系统无法检测到的目标。从处理结果来看空域自适应处理方法有效抑制了杂波信号，大大改善了外辐射源雷达的探测性能。%The passive radar has many advantages like good invisibility, anti-stealth capability, simple and relia-ble, and so on, which attracts more and more attentions in recent years. However, in practical application, the de-tecting capability of the radar system is weakened seriously by clutter signals like the direct wave signal, multipath signal and the signal with same frequency, and its application is limited. A passive radar based on digital array sys-tem, which takes FM broadcasting signals as illumination source is analyzed, and an adaptive spacial processing method is presented to reject the clutter signal and detect the targets which can not be detected before rejecting clut-ter. Seen from the processing results, using the adaptive spacial processing method can effectively reject clutter sig-nal and improve detecting capability of the passive radar greatly.
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