RESOURCESAT-1 LISS-4 MX bands onground co-registration by in-flight calibration and attitude refinement

摘要

RESOURCESAT-1 satellite was launched in October of 2003. Since then it has been consistently providing high quality 5 m monochromatic and multispectral images of same resolution. LISS-4 MX sensor has complex acquisition geometry. It operates in three spectral bands imaged by 3 CCD arrays, which are separated by a finite time in imaging along the satellite track direction. Individual band data is acquired at different times while the satellite is driven by a pre-determined yaw profile. In addition, the odd– even pixels are too shifted by a small fixed delay in time. A unique challenge in LISS-4MXLevel-2 data processing sub-system is to autonomously rectify and additionally co-register the three bands data because of the influence of orbit and attitude in the time gap in the imaging sequence. In this paper, authors bring out details of in-flight calibration arrived for LISS-4 MX sensor. It addresses parameterization of co-registration problem by doing sensitivity analysis of the geometric model parameters to achieve coregistration among all bands. This approach can also be used for other sensor system having similar imaging geometry to achieve improved image co-registration among bands.