On the basis of this,the authors propose a rudimentary frame of the spread spectrum radio train location system,and compare it with the other train location methods in CBTC system.

This paper generalizes the principle and character of spectrum communication, comparing two connecting procedure between the wireless and wiring communication data net, analyzing the engineering examples involve in how to apply the wireless spread spectrum communication technique to combine such three nets as datas, sounds and images into one net for sending.

Through the way of contract with the parts of an area Internet,and it expound the advantage of wireless spread spectrum technology.

The specific application of spread spectrum radio communication to DA system for county level in south of the Changjiang river is introduced, as an example of spread spectrum radio communication system for Yushui district which is the first test in Jiangxi province, including contriving scheme, establishing relay station, installation and debugging.

The theory and main characteristics of wireless spread-spectrum technology are analyzed,and based on it,a wireless local area network(WLAN) of GPS real-time supervisory system for roller compaction is established,which not only implements the bidirectional data communication between general control center and each mobile remote,but also achieves resource share among each node of the WLAN.