星载降水测量雷达有源定标技术研究

Research on active calibration of spaceborne precipitation radar

针对降水测量雷达的定标需求,提出基于四个有源雷达定标器的多站有源定标方法,给出定标器布设方式,并设计有源定标时序。分析定标过程中的误差源及其对定标精度的影响,仿真验证表明,四站有源定标的波束匹配偏差定标精度优于0.01°,系统定标精度优于1dB。方法在满足高精度定标的同时,能够实现在降水观测模式下对雷达性能的评估,降低天地定标试验的复杂度。

In this paper,an active calibration method using four active radar calibrators is presented based on the calibration requirements of the precipitation radar.The layout of the active radar calibrators is given,and the timing of the active calibration is designed.The sources of errors in the calibration process and its influence on the calibration accuracy are analyzed.The simulation results show that the calibration accuracy of the radar beam matching is better than 0.01°,and the calibration accuracy is better than 1 dB.While satisfying high-precision calibration requirements,this method can evaluate the performance of the radar in the precipitation observation mode,and reduce the complexity of the calibration experiment.