摘要
本文针对低轨卫星直接序列扩展频谱 (DSSS)通信中的信号同步问题 ,提出了基于软件无线电平台的处理方法。采用了二维联合搜索的快速算法 ,同时捕获扩频信号的载频和码起点。在持续跟踪中 ,利用匹配滤波器的相关重构 ,并采用频率、相位细分和多帧叠加处理的抗噪算法 ,较好地解决了大动态范围多普勒频移的跟踪难题 ,同时也对码起点的持续漂移进行了良好的同步处理。最后 ,给出了试验数据和分析、改进 。
According to the signal synchronization of LEO’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 correlative re-conformation of matching filter, with the subdivision of frequency or phase, a multi-frame processing arithmetic for anti-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 environment.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2004年第5期641-645,共5页
Acta Armamentarii
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
马起点
捕获与跟踪
匹配滤波器
communication technique, software radio, direct sequence spread spectrum, doppler effect, code start point, acquisition and tracking, matching filter
