２１世纪是人类全面进入信息电子化的时代，随着人类探知领域和空间的拓展使得人们需要获得的电子信息种类日益增加，要求信息传递的速度加快和信息的处理能力增强，因而要求与此相对应的信息技术中的三大核心技术信息采集技术———传感技术、信息传递技术———通讯技术和信 The 21st century is a time when mankind fully enters into the era of electronic information. With the expansion of man’s exploration field and space, the types of electronic information that people need to obtain are increasing day by day. As the speed of information transmission and the enhancement of information processing capability are required, Corresponding information technology in the three core technology information collection technology --- Sensing technology, information transmission technology --- Communication Technology and Communication