【摘要】 利用无源雷达来对目标检测是目前电子对抗研究的一个热点.该文给出了以调频广播信号为非合作照射源来进行目标探测的传输模型,由此计算出目标回波信号与直达波功率比(信直比)、信杂比和信噪比的强度,然后将三者的强度进行了对比分析,得出了直达波对整个系统性能一直起到主导作用,而对于不同的基线距离,信噪比和信杂比对系统性能影响程度的比重将发生变化,从而为后续的杂波抑制和信号检测提供了理论依据.更多还原

【Abstract】 Target detection by passive radar has attracted the attention of many researchers in the electronic warfare field. In this paper, the mathematical model of target detection regarding the FM signal as the non-cooperative illumination source is given to calculate the power ratio between the target echo signal and direct wave(SIR), the SCR and the SNR, and then to compare and analyze the strengths of them, drawing a conclusion that the direct wave always plays a dominant role in the whole system performance, while for different baselines, the proportions of influence of SNR and SCR on the system performance will change. This provides a theoretical basis for the follow-up clutter suppression and detection.更多还原