空间扫描相机点目标采样系统设计

摘要

In order to obtain high and stable SNR, the arrangement of pixels, the size of pixels and the oversampling times of sampling system should be properly designed. The mathematical model of the space scanning sensor point target sampling system is presented in this paper. From the model, design variables of the system is obtained, and the sampling results of point target in different design variables are calculated. Based on the analysis of sampling results, the change tendency of the SNR of the point target image with the design pa-rameters is obtained. The design parameters should be selected based on the sampling results of the mathemat-ical model and considering the influence of background energy intensity and fixed noise, so as to get high and stable SNR. In this paper, sampling systems of different pixel arrangements, pixel sizes and sampling times are simulated, the SNRs of different sampling systems are analyzed, and the appropriate design parameters are ob-tained.%为了使点目标图像信噪比高而且稳定，在对空间扫描相机点目标采样系统进行设计时需要对像元的排列方式、像元尺寸大小和扫描时的过采样倍数进行选择。文章建立了空间扫描相机点目标采样系统的数学模型，从数学模型中得到了系统的设计变量，并计算出了不同设计变量下的点目标采样结果。通过对采样结果进行分析，得到了理想情况下点目标图像信噪比随设计参数的变化趋势。需要在数学模型得到的采样结果基础上，综合考虑相机噪声、背景能量强度等因素的影响，对设计参数进行选择，从而得到高而且稳定的图像信噪比。文章对不同的像元排列方式、像元尺寸和过采样倍数的采样系统进行了仿真，对不同采样系统的图像信噪比进行了对比分析，得到了合适的设计参数。