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建立了频率步进雷达挂飞试验的相对运动模型，该模型能够简化雷达平台与目标间的径向运动的分析复杂度。在该模型下，分析了挂飞试验中雷达平台与目标之间的相对运动的运动特性。通过理论推导，发现当雷达平台做匀速直线运动时，在任意一个雷达相参处理周期内，雷达平台与目标之间的相对运动都可以看作匀速直线运动，并进一步分析讨论了不需要进行二次项补偿即可直接成像的最大平台运动速度。“,”A relative motion model for flight experimentation of stepped frequency radar was built,which can predigest the analysis complexity the radial motion between the radar platform and target. With this model,the motion characteristics of the relative motion between the radar platform and target in flight test were analyzed. It is found by theoretical derivation that,in any one period of radar phase parameter processing,the relative motion between the radar platform and target can be regarded as uniform linear motion when the radar platform moves in uniform linear motion. A max platform moving speed which can realize direct imaging without quadratic term compensation is analyzed and discussed.