摘要
研究了用于低轨卫星通信的直接序列扩频系统的码捕获技术。首先,分析了低轨卫星通信中影响码捕获的主要因素,在此基础上,综述了码捕获技术的研究发展过程,针对当前码捕获技术用于LEO卫星通信时存在的两个主要问题,即抗载波频偏能力有限和对码频频偏考虑不足,就三种典型的码捕获技术进行了研究,最后指出了码捕获技术的研究方向。
It is studied that the code acquisition technology of direct sequence spread spectrum system in LEO satellite communication. Firstly, the main factors affecting code acquisition used in LEO satellite communication are analyzed. On the basis of this, it is summarized that the studying developments of code acquisition techniques. For two main problems of code acquisition technologies used in LEO satellite communication, which are limited ability of adapting to cartier frequency offset and code frequency offset, three typical code acquisition technologies are studied. Finally, the research direction for code acquisition is given.
出处
《无线通信技术》
2008年第1期24-28,33,共6页
Wireless Communication Technology
关键词
直接序列扩频
码捕获
载波频偏
码频频偏
频率扫描
direct sequence spread spectrum
code acquisition
cartier frequency offset
code frequency offset
frequency-scanning
