同步轨道星-空双站SAR构型下(卫星作为发射端、浮空器作为接收端)，为了应用空时自适应处理(Space Time Adaptive Processing, STAP)方法更好地抑制杂波，进行地面慢速运动目标检测，有必要分析杂波特性。该文从地面运动目标检测角度出发，建立了同步轨道星-空双站 SAR 杂波特性的理论模型，分析了杂波的角度-多普勒轨迹的距离依赖性特点，仿真实验证明了模型建立和理论分析的正确性。该文的理论模型和分析结论揭示了同步轨道星-空双SAR这一新模式下的杂波特性，为该模式下地面运动目标检测方法的选择和研究奠定了理论基础。%Considering the geometry of geosynchronous satellite-air bistatic Synthetic Aperture Radar (SAR) where the geosynchronous satellite is the transmitter and the aerostat is the receiver, to suppress clutter and detect a slow-moving target using Space-Time Adaptive Processing (STAP), it is necessary to analyze the clutter characteristics. From the viewpoint of a ground moving target indication, a theoretical model of the clutter characteristics considering the geometry of geosynchronous satellite-space bistatic SAR is analyzed and established in this study; in particular, the range-dependence characteristics of the angle-Doppler curve of the clutter is analyzed. Finally, the simulation verifies the correctness of the analysis. The theoretical model described and the conclusion presented in this paper indicate the clutter characteristics of the new geosynchronous satellite-air bistatic SAR mode and provide a theoretical basis for the selection and research of a ground moving target indication method for use in this mode.
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