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敏捷卫星成像过程中姿态变化灵活,积分时间变化剧烈,传统卫星积分时间计算模型已无法满足精度要求。因此,提出一种改进的积分时间计算模型,在星地斜距计算和摄影点地速计算两方面作了改进。星地斜距计算时利用地表数字高程模型修正理论的斜距值,摄影点地速计算中增加姿态角速度对卫星本体坐标系角速度矢量的影响,并设计了整个算法在星上数管分系统中的实现方案。最后在星载嵌入式环境下进行了仿真计算,并与地面仿真计算结果进行了比对分析。两者比对偏差在0.01‰以内,可以满足相机成像质量要求。
Agile satellite imaging process changes in attitude flexibility, dramatic changes in integration time, the traditional satellite integral time calculation model has been unable to meet the accuracy requirements. Therefore, an improved integral time calculation model is proposed, which is improved in the calculation of the satellite slant distance and the calculation of the ground speed of the photographing point. In the calculation of celestial slant distance, the slope value of the theory is corrected by the surface digital elevation model. The influence of attitude angular velocity on the angular velocity vector of the satellite body coordinate system is increased in the calculation of the ground speed of the photographing point. In addition, The realization of the program. Finally, the simulation is carried out in spaceborne embedded environment, and compared with the ground simulation results. The deviation between the two within 0.01 ‰, to meet the camera imaging quality requirements.