空间目标监视雷达通常采用有源雷达，为了充分发挥无源雷达在空间目标监视中的本身优势，该文分析了利用卫星信号作为机会源的外辐射源雷达探测空间目标的可行性。首先，从可探测时间、直达波抑制等角度分析了利用卫星信号的外辐射源雷达能够较好地探测低轨目标。同时，仿真分析了卫星信号外辐射源雷达 Ku 和 L 波段空间目标双站横截面积(Radar Cross Section, RCS)，为空间目标前向散射能量的选择提供基础。最后，研究了系统增益、积累时间、辐射源选择等系统关键参数，从关键参数的分析可以看出，利用同步卫星电视的外辐射源雷达系统规模相对较小。分析结果可以大大促进卫星外辐射源雷达探测空间目标的发展。%Space target surveillance generally uses active radars. To take full advantage of passive radars, the idea of using spaceborne illuminators of opportunity for space target detection is presented in this paper. Analysis of the detectable time and direct wave suppression shows that passive radar using spaceborne illuminators of opportunity can effectively detect a Low-Earth-Orbit (LEO) target. Meanwhile, Ku and L band bi-static radar cross section of passive radars that use spaceborne illuminators of opportunity are presented by simulation, providing the basis of choosing space target forward scatter. Finally the key parameters, mainly system gain, accumulation time and radiation source selection are studied. Results show that system size using satellite TV signals as illuminators of opportunity is relatively small. These encouraging results should stimulate the development of passive radar detection of space targets using spaceborne illuminators of opportunity.
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