An integral time calculation model for agile satellite TDICCD camera

As a key parameter of agile satellite TDICCD camera, the integral time calculation accuracy affects the satellite imaging quality directly. The traditional integral time calculation model is unable to satisfy the accuracy requirement for attitude changes flexibility and integral time changes severely during the satellite imaging. This paper describes an integral time calculation model that improved in aspects of calculation of photography point ground velocity and calculation of height from satellite to photography point. Calculation of height from satellite to photography point adopted digital elevation model (DEM) to correct the ideal value. In addition to, the model added attitude angular velocity's impact to the satellite body coordinate system angular velocity vector to photography point ground velocity calculation. The approach designed implementation scheme of the whole algorithm on OBDH subsystem onboard and took simulation calculation under the embedded environment. The analysis results manifests the approach could meet the requirement of agile satellite camera imaging quality since the difference is within 0.05 microseconds through comparison with STK simulation calculation results.