斜采样技术的混叠分析及分辨率计算

 斜采样技术通过将线阵探测器倾斜一定的角度并调节积分时间的方法,利用较低成本实现了探测器的亚像元成像.本文对单线阵斜采样及超模式斜采样方式的混叠及分辨率进行了研究.通过对采样方式在频域对偶网格的分析,建立了斜采样成像系统与混叠的关系,在有效分辨率的意义下,确定了混叠与噪声最小的最佳倒易晶胞,将错位的频谱恢复到了正确的位置,提高了分辨率.实验结果表明,通过最佳倒易晶胞去除混叠的斜采样技术有效地提高了线阵采样式光学遥感器图像分辨率.

The Aliasing Analysis and Resolution Calculation of Tilting Sampling System

The tilting sampling which rotates the single array with a degree and reduces the sampling distance can get a better resolution with less hardware cost.This paper introduces titling model and the supertilting model sampling.Then the resolution under different sampling systems is discussed.Based on reciprocal cell in the frequency domain,the relation model of aliasing and tilting sampling is built.The effective resolution based optimal reciprocal cell is calculated to get the set of spectrum with less aliasing and noise.Experimental results indicate that tilting sampling mode with optimal reciprocal cell improves the resolution effectively.