Effect Analysis of Orbital and Attitude Parameter Error on TDI-CCD’s Line-shift Frequency and Veer Angle

Unlike other references which usually concentrate on geometric methods, kinetic approach is adopted to analyze the motion of space-born TDI-CCD camera's target, for a convenient analysis of kinetics, a series of coordinates is chosen. The velocity vector of the nadir is expressed in the sensor coordinate after some transformations which are functions of orbital and attitude parameters. For a nadir-pointing satellite, the first-order approximation of attitude parameters in the velocity vector is obtained with the tiny alignment error. From the relations between target's motion and orbital and attitude parameters, it takes little effort to derivate equations of line-shift frequency and veer angle with respect to orbit and attitude parameters, these explicit formulas of line-shift frequency and veer angle facilitate the procedure of analytical decision of error budget, especially in the primary design phase of a space mission. This application is illustrated by some typical LEO mission examples following the analysis.