Satellite-borne SAR high-efficiency multi-beam distance pattern on-orbit test method

The invention relates to a satellite-borne SAR (synthetic aperture radar) high-efficiency multi-beam distance pattern on-orbit test method, which comprises the following steps: (1) in a ground design stage, planning an antenna pattern test mode, and designing a beam position parameter and an imaging parameter group; (2) recording echo data in an antenna pattern test mode; and (3) processing echo data, fitting a power spectrum, calculating a power change relative to a normal wave position, and comparing the power change with ground test data or a theoretical directional diagram. According to the satellite-borne SAR high-efficiency multi-beam distance pattern in-orbit test method, the in-orbit test acceptance time is greatly shortened, the effective service life of a satellite is prolonged, and meanwhile, the manpower and material resource cost of satellite in-orbit test is reduced. 本发明涉及一种星载SAR高效率多波束距离方向图在轨测试方法，包括如下步骤：（1）在地面设计阶段，规划天线方向图测试模式，设计波位参数和成像参数组；（2）录取天线方向图测试模式下的回波数据；（3）处理回波数据，拟合出功率谱，计算出相对法向波位的功率变化，与地面测