IMAGE QUALITY ESTIMATION FOR SATELLITE OPTICAL INSTRUMENT USING CALIBRATION SITE IN VIETNAM

Optical instrument on Earth observation satellite performs the conversion from incoming radiance to digital image. Practically, there is always distortion or noise infringed on the output image. On the other hand, the instrument is suffering from degradation due to hard operating environment and aging. Therefore measurement and correction of optical image quality parameters must be done by ground station in order to maintain the reliable and accurate remote sensing products. This paper describes the methodology to evaluate the Modulation Transfer Function (MTF) and Signal to Noise Ratio (SNR) of received images to control the image quality of the optical satellite. MTF and SNR of VNREDSat-1 satellite are verified using on-ground calibration sites in Vietnam. The output provides important figures for next-step instrument calibration process.