提高线阵采样式光学遥感器图像空间分辨率的新方法研究

A Study on a New Method for Improving Image Spatial Resolution of Sampled Optical Imager with Single Array

介绍了提高采样式光学遥感器图像空间分辨率的国内外发展现状,以任意两维周期采样理论为基础,探索了一种通过把线阵探测器倾斜θ度而非常规线阵推扫的0°,同时把推扫方向的采样间距缩短为P/m,而非常规线阵推扫的P的新焦平面采样方法。该方法相对于常规线阵推扫采样,可以增加采样密度,提高图像空间分辨率。在原理研究的基础上,设计了一套实验验证系统,通过实验系统对该方法进行了物理及其可行性验证。试验结果表明:如果探测器阵列旋转45°并且推扫方向采样间距减半,相对常规线阵推扫采样,图像的空间分辨率可以提高1.64倍左右。相对于高模式采样技术和超模式采样技术,该方法避开了两排错位排列探测器的难题,因此工程实现上要简单。

The technology status of improving image spatial resolution of sampled optical imager was briefly presented in the paper. On the base of two dimensional sampling theory, a new FPA sampling method, in which the single array was rotated by θ degree, not 0 degree, and the sampling distance along track was reduced to P/m, not P of normal push-broom sampling, was studled. Compared with normal push-broom sampling, the sampling density of the method could be increased, therefore, the spatial resolution could be improved. According to the principle of the new method, a experiment system, which is used to validate the effect of spatial resolution improvement and its engineering feasibility, was designed. If the sampling distance along track is reduced by half and the array was rotated by 45 degree, the results showed, the spatial resolution of the image acquired with the new method could be improved by about 1.64 times compared with normal push-broom sampling. Because the two shifted detectors is avoided, the engineering implementation of this method is relative simpler than that of super-mode sampling and hiper-mode sampiing.