卫星TDICCD相机非沿轨成像仿真方法

Two Imaging Simulation Methods of the Satellite TDICCD Camera in Non-track Direction

传统的TDICCD相机沿轨成像模式只需要调整偏流角和卫星飞行速度决定的积分时间,而TDICCD相机非沿轨成像则需要更加复杂的姿态和积分时间控制。对TDICCD相机非沿轨成像进行仿真,有助于了解其工作原理,并有针对性地研发数据处理方案。文章实现了卫星TDICCD相机对非沿星下点轨迹方向条带目标成像的两种仿真方法。一是“南北方向”成像仿真方法,另一种是“摆扫”成像仿真方法。推导了这两种成像在星下点成像和偏离星下点成像两种条件下TDI积分时间和姿态运动的计算方法。通过多级积分条件下的靶标成像效果和成像范围验证了所述方法的正确性和通用性。

The traditional TDICCD camera only needs to adjust the drift angle and the integration time determined by the satellite's flight speed,while the TDICCD camera needs more complex attitude and integration time control for non-track imaging.The simulation of non-track imaging of the TDICCD camera is helpful for us to understand its working principle and develop a targeted data processing scheme.In this paper,two imaging simulation methods of the satellite TDICCD camera for strip target imaging in the non-track direction are realized.One is the“north-south direction”imaging simulation method and another is the“swing scan”imaging simulation method.The calculation methods of TDI integral time and attitude motion under nadir imaging and off nadir imaging conditions are derived.The correctness and generality of the proposed methods are is verified by the target imaging effect and the imaging range of multi integral levels.