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FY-3卫星微波成像仪用于大气微波遥感、海洋微波遥感和陆地微波遥感,是气象、海洋和灾害监测的重要遥感手段之一。微波成像仪在轨运行时能否获取有价值的探测资料,得到定量化的应用和真正的业务使用,主要取决于微波成像仪能否进行精确定标。而非线性偏差的大小又直接与微波成像仪定标精度的大小有关。主要分析了影响微波成像仪非线性偏差的因素,以及降低微波成像仪非线性偏差的方法,并给出了微波成像仪各通道真空定标下非线性偏差。
FY-3 Satellite Microwave Imager is used in atmospheric microwave remote sensing, marine microwave remote sensing and terrestrial microwave remote sensing, and is one of the important remote sensing means for meteorological, oceanographic and disaster monitoring. Whether the microwave imager can acquire valuable exploration data during orbit operation and get quantitative application and real business use mainly depends on the accuracy of the microwave imager calibration. The size of the non-linear deviation is directly related to the accuracy of the calibration standard of the microwave imager. This paper mainly analyzes the factors affecting the nonlinear deviation of the microwave imager and the method of reducing the nonlinear deviation of the microwave imager. The nonlinear deviation of each channel of the microwave imager under vacuum calibration is given.