Point target detection based on Temporal-Spatial Over-Sampling system
基于时－空过采样系统的点目标检测性能分析

In order to improve the ability of scanning imaging system detecting the point target, the temporal-spatial over-sampling point target detection system is proposed and then the target detecting performance of the system is analyzed. Firstly, the problem of the target energy dispersion induced by cross-pixels of single sampling system in target detection and the problem of false alarm induced by the random high intensity noise of detector and the spike of space proton flux are analyzed. Then, the Temporal-Spatial over-sampling system used to scan and detect point target is put forward. Finally, the target detecting performance of single sampling and temporal-spatial over-sampling system for the same optical system is comparatively analyzed based on the image signal to noise ratio. The results show that the over-sampling system can guarantee the demand of detecting signal to noise ratio by centralizing the target energy into a pixel. The target scale can be larger than noise and spike scale by high-resolution fusion and the target scale can be extended to 3?3 pixels, then the false alarm of target detection can be decreased effectively based on the scale.