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为实现面阵相机对沿轨方向长条带区域一定重叠率的推凝视成像,设计了高分辨CMOS传感器的钟摆式搜索成像模型.通过长条带逐层区域划分和成像重叠率渐近变化构建,计算了钟摆式搜索成像参量和卫星实时推凝指向姿态,并利用多次小幅逼近的PD控制器分析了搜索成像姿态控制精度与成像像移失配量.利用高分CMOS原理样机和小卫星姿控仿真平台对P5型曲面LED靶标系统进行地面等比缩放的长条带钟摆式搜索成像仿真试验.结果表明:帧间重叠率大于85%的钟摆式搜索成像比全凝视成像区域扩大了4倍;控制周期为10 Hz时,其姿态控制精度优于0.05°,姿态稳定度优于0.003°/s,搜索成像对应的图像传递函数能够达到0.141 1.
In order to realize the push-on-gaze imaging of the area strip camera with a certain overlapping rate along the track, a pendulum-based search imaging model of the high-resolution CMOS sensor is designed.According to the strip-by-strip area and the asymptotic change of the image overlap rate, , The pendulum-type search imaging parameters and the satellite real-time push-and-roll pointing attitude were calculated, and the control precision of the imaging attitude and the imaging mismatch of imaging were analyzed by using PD controllers with small approximation.Using high-precision CMOS prototype and small satellite Attitude control simulation platform is used to simulate the long-strip pendulum-type search imaging with P5 curved LED target system. The results show that the pendulum-type search imaging with the inter-frame overlapping rate larger than 85% expands by 4 When the control period is 10 Hz, the attitude control accuracy is better than 0.05 ° and the attitude stability is better than 0.003 ° / s. The image transfer function corresponding to search imaging can reach 0.141 1.