针对FY-3A/VIRR传感器定标精度有限、且场地定标机会有限的问题,介绍了利用高精度的TERRA/MODIS 31通道对FY-3A/VIRR 红外4通道进行绝对交叉定标的方法。 选用2013年1月、3月和9月的卫星数据进行了交叉定标计算,并对交叉定标结果进行验证。结果表明,VIRR利用交叉定标系数计算的通道亮温与MODIS匹配 点处的实测结果具有很好的一致性,绝大多数的亮温偏差在1 K以内。对不同月份交叉定标结果进行的验证表明,交叉定标系数具有普遍适用性。

Considering the limited calibration accuracy of FY-3A/VIRR sensor, and limited opportunities for calibration, the cross-calibration method of infrared channel of VIRR with high-precision MODIS of the onboard polar-orbit satellite TERRA is introduced. The cross-calibration is implemented by using the satellite data in January, March and September of 2013. The results show that the brightness temperature of VIRR calculated by using cross-calibration coefficients is nearly equal to the observed value of MODIS, and the vast majority of brightness temperature bias is less than 1 K. The validation results showed that cross-calibration coefficients has universality.