On-orbit radiometric calibration of high spatial resolution satellite optical sensor based on sub-pixel targets

Radiometric calibration is one of the key technologies for quantitative application of optical remote sensing satellite data. A calibration approach of high resolution satellite optical sensor is presented using sub-pixel targets. The reflected point sources is used as the detection reference, and the ground synchronization measurement is mainly used. The atmospheric transmittance and at-sensor radiance is calculated by simplified radiometric transfer code. The method can also effectively isolate the response of remote sensing image created by the sub-pixel targets from the response produced by sky path radiance, ground-atmospheric coupled radiance and background radiance according to the multi-energy sub-pixel targets setting and in-flight point spread function estimation.