Application of SAW Devices in Expanded Frequency Spectrum Communications

摘要

Expanded frequency spectrum communications, hereafter referred to as 'expandedcommunications' is a very important technology in modern communications. It features good resistance to interference and good security capabilities. In the area of rangefinding, it is able to improve the rangefinding accuracy because rangefinding accuracy is related to th expanded band. In use, it offers code portion multiple addresses; multiple users can use a channel jointly. SAW devices have many applications in a communications system. This paper is intended chiefly to describe the application of the SAW-MSK signal modulator/generator and the SAW convoluter in an expended communications system, and to report on several actual results. In today's world, there are many forms of expanded communication. MSK (minimum frequency drift key control) signals are one kind of binary digit modulating signal whose excellent functions have attracted attention. This is because, in comparison with the frequency used PSK signals, they not only possess the features of a constant amplitude and continuous phase, but they also have a relatively concentrated energy spectrum. Radiated power outside the band rolls down quickly, and the crossover interference between the frequency channels is small. Chinese translations, Reprints. (RRH)