A Two-region Push-broom Imaging Method for Remote Sensing Moving Object Detection
Aiming at the problems of high cost,poor temporal and spatial synchronization and low detection accuracy in the detection of ground moving targets by spaceborne dual array cameras,a push-broom imaging method of dual-region linear array camera based on single array CMOS is proposed.CMOS time delayed and integration(TDI)technology is used to window at a fixed position interval to realize dual-region push-broom imaging.For the two-channel data,sequential mode image acquisition is performed to form two independent and complete long strip images.The motion characteristics of high-speed moving targets are detected and analyzed by establishing the time and position functions of the dual-region linear TDI camera.Based on the principle of satellite push-broom earth imaging,a TDI push-broom imaging experimental device is designed and built to detect the velocity of high-speed moving targets.The experimental results show that when the resolution of CMOS pixel is 4 096×3 072,the field of view angle is 16°0′34″,the line frequency is 998 Hz,and the window interval is 3 056 rows,the absolute velocity error is less than 0.445％,and the image motion velocity error is 2.323 pixel/s,which ensures spatiotemporal synchronization,improves the detection accuracy,and verifies the feasibility of the method.
Space remote sensingSpaceborne cameraPush-broom imagingMoving object detection
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