星载遥感相机像移分析

随着航天遥感技术的不断发展,遥感相机对地分辨率不断提高。在空间遥感成像过程中,由于成像载体与地面目标之间存在相对运动,导致目标图像在成像介质上产生像移,使遥感图像模糊不清,所以像移补偿成为提高成像质量和相机分辨率不可缺少的环节。通过建立计算遥感像移的数学模型,对各种因素产生的像移影响进行定量分析。结果表明:对星载遥感相机进行像移补偿时,可以忽略由于卫星姿态改变等随机因素产生的像移,而主要补偿因卫星沿轨道运动和地球自转造成的像移。最后,通过对实例的仿真验算,提出了一套针对星载遥感相机的机械式像移补偿方案。

Analysis of image motion of satellite remote sensing camera

With the development of aerospace remote sensing technology, the ground resolution of remote sensing camera enhances continuously. Since there is relative motion between camera and ground target when taking pictures, the target' image recorded in recording media is moved and blurred. In order to enhance the imaging quality and resolution of the camera, the image motion had to be compensated for. Through establishment of the mathematical model for computing the remote sensing image motion, image motions due to various factors were quantitatively analyzed. It is shown that, when image motion of satellite camera is compensated for, which due to the random change of satellite altitude can be ignored, but those resulted from satellite moving along its orbit and the Earth rotation must be compensated for. Finally, through simulation verification of an example, an image motion compensation scheme with mechanical method for satellite remote sensing camera is work out.