围绕单采样和过采样扫描探测体制下的点目标定量检测性能, 基于亚像元的采样模型, 建立了一定分辨率条件下探测不同高度、尺寸目标的成像链路仿真模型, 从目标信号采集能力、背景及杂波水平影响、检测能力和测量特性四个方面对比分析了相同瞬时视场的单采样、过采样以及两倍瞬时视场的过采样三种规格采样体制的目标检测性能.分析结果表明:相同瞬时视场的过采样比单采样更有利于目标信号的采集, 检测能力更强, 两倍瞬时视场的过采样对目标信号有抑制作用, 不利于低信杂比情况下的目标探测；两种规格的过采样对背景信号及杂波均有抑制作用；两种规格的过采样对目标辐射强度都有明显的过采集误差, 必须进行修正.

This paper focuses on quantitative detection performance for point target with single-sampling and over-sampling systems. An imaging chain simulation model based on the sampling model of sub-pixel is presented, which depicts detection for targets with various heights and sizes under given resolution conditions. Single-sampling and over-sampling with the same IFOV, over-sampling of two times IFOV were taken into account. Performance of the three sampling systems was compared and analyzed from the following four aspects: target signal’s acquisition capability, background signal and clutter level, detectability and measurement characteristics. Results show that over-sampling of the same IFOV is conductive to the acquisition of the target signal and has better detectability, while that of two times IFOV suppresses target signal and goes against detecting target with low SCR. The over-sampling has inhibitory effect on background signal and clutter while collects apparently superfluous radiation intensity that has to be corrected.