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自1957年第一颗人造卫星发射到现在,苏联共发射了2,000多颗卫星;美国共发射1,000多颗卫星;其他国家共发射约100颗卫星,总共已发射了3,000多颗卫星。在这众多的卫星中,目前尚在工作的,美国卫星约有200颗,苏联约有100多颗,其他国家的卫星只有10颗左右。这些卫星多半是军用卫星,但也有相当一部分是民用卫星。无论是军用卫星,还是民用卫星都主要使用光电传感器搜集信息,然后通过传输方式回收信息,利用各种处理设备加工处理信息,最后提供使用。光电传感器及其相应的一系列技术在遥感领域中一直处在至关重要的地位,发展很快。其发展趋势大致如下:
Since the first satellite was launched in 1957, the Soviet Union has launched more than 2,000 satellites; the United States has fired more than 1,000 satellites; other countries have fired about 100 satellites and fired over 3,000 satellites in total. Among the many satellites currently in operation, there are about 200 U.S. satellites, about 100 Soviet satellites and about 10 satellites in other countries. Most of these satellites are military satellites, but a considerable part of them are civilian satellites. Whether military satellites or civilian satellites are mainly used photoelectric sensors to collect information, and then recovered by transmission of information, using a variety of processing equipment processing information, and finally provide the use. Photoelectric sensors and their corresponding series of technologies have always played a crucial role in the field of remote sensing and have developed rapidly. Its development trend is as follows: