遥感卫星利用星载遥感器获取地球及其环境的多种波段的电磁波信息,并将这些信息发送给地面接收站。地面接收站对这些信息处理和判读后,就可得到各类目标的特征、分布和状态等资料。遥感卫星不仅可用于军用监测、侦察、预警,而且可广泛用于勘测和研究地球环境和资源,其相关图像资料有广阔的市场。分辨率是卫星遥感的主要技术指标。一般卫星遥感器对地物的几何分辨能力,也可理解为遥感图像上能分辨地面两个点目标的最少距离。长期以来,高分辨率遥感卫星的图像控制在美国、前苏联/俄罗斯等国家的军事部门手中,禁止商业应用。冷战结束后,为了商业利益,俄罗斯和美国开始在市场上销售经过解密的侦察卫星图像。1992年,美国国会通过了土地遥感政策法规,明确了商业遥感图像对国家安全的重要性,并授权美国商业部,对私人企业运营空间遥感系统核发执照。1994年,美国总统克林顿发布了 Remote sensing satellites use spaceborne telemetry to acquire electromagnetic wave information in multiple bands of the Earth and its environment and send it to ground receiving stations. Ground receiving stations on the handling of these information and interpretation, you can get the characteristics of various targets, distribution and status information. Remote sensing satellites can not only be used for military monitoring, reconnaissance and early warning, but also widely used for surveying and studying the earth’s environment and resources, and have a vast market for related image data. Resolution is the main technical indicator of satellite remote sensing. Geometrical satellite remote sensing geomagnetism resolution ability can also be understood as the remote sensing image can distinguish the minimum distance between two points on the ground. For a long time, the image control of high-resolution remote sensing satellites was banned in commercial applications in the military departments of the United States, the former Soviet Union / Russia and other countries. After the Cold War ended, Russia and the United States began to market decrypted reconnaissance satellite images for commercial gain. In 1992, the United States Congress passed land remote sensing policies and regulations, which clearly defined the importance of commercial remote sensing images for national security and authorized the U.S. Department of Commerce to issue licenses for the operation of remote sensing systems for private enterprises. In 1994, U.S. President Clinton released