关键词: 通信技术 , 软件无线电 , 直接序列扩展频谱 , 多普勒频移 , 码起点 , 捕获与跟踪 , 匹配滤波器

Abstract: According to the signal synchronization of LE〇，s direct sequence spread spectrum (DSSS) communication, a method based on software radio platform was described. Using the planar search, code start point and carrier frequency were reached at the same time. In the continuous tracking, using the cor?relative re-conformation of matching filter, with the subdivision of frequency or phase, a multi-frame pro?cessing arithmetic for antトjamming was put forward. This arithmetic provides a good solution for the wide dynamic range of Doppler frequency and the code start point excursion. At the end of this article, test data and its analysis were provided, which can be of reference value for DSSS communication in low SNR envi?ronment ?

Key words: communication technique , software radio , direct sequence spread spectrum , doppler effect , code start point , acquisition and tracking , matching filter