高分辨率光学遥感卫星反射点源像点提取方法

像点提取精度是高分辨光学遥感卫星几何定标精度的关键因素之一。本文提出一种基于轻小型、自动化反射点源的像点提取方法，以参数化高斯模型拟合获取点源影像的像点坐标。在轨试验结果初步表明，反射点源法所提取的像点坐标的共线误差小于0.001像素，比例常量的相对标准偏差优于5‰，与质心法等常用方法提取的点源像点坐标相比较，精度优于0.05像素。反射点源不仅能够实现高精度的像点提取，而且还能够实现高分辨率光学遥感卫星的高精度几何定标与像质评价，对提高我国航天遥感立体测绘精度具有重要意义。

Pixel extraction of reflected point source image for high spatial resolution optical remote sensing satellite

Pixel extraction accuracy is one of the key factors for geometric calibration accuracy of high resolution optical remote sensing satellites. A pixel extraction method is presented based on the light and small, automated reflected point source, which obtained pixel coordinates of point source image by parameterized Gaussian model fitting. The preliminary results show that the collinear error of pixel coordinates extracted by the reflected point source method is less than 0.001 pixels. The relative standard deviation of the proportional constant is also less than 5‰. And pixel coordinates extraction accuracy of point source image is less than 0.05 pixels comparing with common methods such as centroid method. The reflected point source can not only achieve high-precision pixel extraction, but also realize high-precision geometric calibration and image quality evaluation of high resolution optical remote sensing satellites, which is of great significance for improving the accuracy of China's space remote sensing stereo mapping.