Distributed Ground Sensor Detection Systems, Spread Spectrum Communications Technology

This research work mainly includes two parts. Firstly it presents how to complete the transmission of the digital signal in the RGS. Secondly it deals with how to design a point-to-point Direct Sequence Spread Spectrum System(DS-SS).At first the dissertation tells us why the Spread Spectrum Communication System is used, in which it includes the characteristics of the Spread Spectrum Communication System. After that the fundamental of Spread Spectrum Communication System, especial for the Direct Sequence Spread Spectrum System is given, such as spread spectrum, modulation, synchronization, PN code and so on.In addition, the structure of point-to-point DS-SS and some basic parameters are given.Finally the dissertation presents the design of hardware and software of the system, where Zilog Z87200 and AT 89C51 are chosen as basic chips. Because of its flexibility and powerful function, the system is suitable for constituting a WLAN.