高分辨率CMOS相机沿轨长条带钟摆式搜索成像设计

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.

Design of Pendulum Type Searching Imaging Along the Track Long-strip with High Resolution CMOS Camera

In order to realize the push-staring imaging with a certain overlap rate of the long-strip region along the track of plane array camera,a pendulum type searching imaging model was designed with a high resolution CMOS sensor.Based on the region division of the long-strip layer by layer and the construction of gradual change of imaging overlapping rate,the real-time push-staring pointing gesture of the statellite and the matching parameters of pendulum type searching imaging were calculated.Besides,a PD (Proportional and Derivative) controller with multiple small approaching was used to analyze the gesture control precision of searching imaging and image shift mismatch quantity.Finally,a ground geometric scaling simulation experiment of the long-strip pendulum type searching imaging of the system of P5 surface LED(Light Emitting Diode) targets was carried out through the CMOS(Complementary Metal Oxide Semiconductor) principle prototype and the small satellite gesture control simulation platform.The results show that,the area of pendulum type searching imaging is larger about four times than that of the staring imaging when the inter frame overlap ratio is more than 85％.The gesture control accuracy is better than 0.05°,the gesture stability is better than 0.003°/s and the corresponding transfer function can reach up to 0.141 1 when the control frequency is 10 Hz.