Standard four periodical rectangular patterns with typical spatial frequency and radiometrictemperature were generated according to signal transfer equation.
该方法从红外成像系统信号传递方程出发，模拟生成不同空间频率、辐射温度的标准四周期矩形样条；
2
FY-2 calibration in Lab calibration in orbit radiometric calibration infrared brightness temperature radiance.