Study On Imaging Simulation For Remote-sensing Satellite With Dual-camera Combined Imaging System

Along with the rapid growth of remote sensing satellite and the high space-resolution demand,some remote sensing satellites carry two identical cameras to improve the swath and re-visit period performance.Therefore,the study on combined imaging system is of great important and value.Based on the dual-camera combined imaging satellite,this paper first studies drift angle adjustment,integration time control and FOV(Field-Of-View)imaging,then the imaging degradation source of dual-camera combined imaging satellite are explored.The major work of this paper includes:A simulation method of drift-angle adjustment analysis is proposed.The cause and adjustment geometrical relationships are studied.Drift angle adjustment model of the satellite in different attitude conditions are established.An analysis method for drift angle adjustment error as well as the impact on imaging quality is proposed,and simulation verification is performed.The simulation result and the application in space project show that the proposed method could accurately analyze the satellite drift angle adjustment parameters.Simulation method of integration time control is studied.The geometrical analysis model for TDICCD remote-sensing satellite of different attitude conditions is studied.The analysis method for integration time simulation is proposed and verified by simulation.The application in space project shows that the method could analyze the satellite integration time parameters accurately for different attitudes.A field of view imaging quality simulation analysis method is proposed.Aiming to optimize the FOV consideration coverage of routine control and simulation method,the physical imaging process is studied and a FOV imaging quality evaluation method is proposed,and simulation verification is performed.Results show this method could perform differential analysis of the entire field of view accurately.Based on modeling and simulation of dual-camera combined imaging system,engineering constraints are proposed.This paper proposed a geometrical analysis model,and the model is validated based on the full-view simulation method at different attitude maneuver angles according to actual satellite imaging scenarios.The result shows that the dual-camera combined imaging system has good performance in sub-satellite imaging during rolling maneuver,but big drift angle residual error is induced while imaging at big pitch maneuver.This residual error could influence the imaging quality of CCD alignment direction,and the direction perpendicular to CCD will also be influenced because of coupling effect.