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论述了用于星载微波辐射计（ＳＭＲ）性能测试的地面定标系统，该系统由定标负载、定标接收机、转台、微波屏蔽暗室、微机及附件组成。利用微机对地面定标系统转台转速和ＳＭＲ一些参数（如积分时间、中放增益等）进行控制，并对测量定标数据进行实时采样、处理和显示。通过地面定标试验，能够得到ＳＭＲ的定标精度、灵敏度、接收非线性和增益不稳定度等主要定标性能参数，为ＳＭＲ的研制和应用提供了必要的理论和工程依据。
The ground calibration system for spaceborne microwave radiometer (SMR) performance testing is discussed. The system consists of calibration load, calibration receiver, turntable, microwave shielding chamber, microcomputer and accessories. The microcomputer is used to control the rotating speed and SMR parameters (such as integration time, medium gain, etc.) of the ground calibration system, and real-time sampling, processing and displaying the measurement calibration data. Through the calibration experiments on the ground, the main calibration performance parameters such as calibration accuracy, sensitivity, receive nonlinearity and gain instability can be obtained, which provides the necessary theoretical and engineering basis for the research and application of SMR.