摘要
在伽利略系统中编码技术日益重要。文章在将混沌扩频技术应用到伽利略系统中后,对系统的信道特性进行了探讨,特别是利用混沌扩频的优秀随机性和正交性对系统进行了信道仿真。仿真结果表明信道衰减小于-40dB,满足CDMA2000协议规范,从而简化了传统CDMA系统PN码产生的复杂性,统一了信号源和信道编码的混沌序列的使用。这种将混沌扩频CDMA技术代替传统PN序列的方法在伽利略系统中的应用具有实用性和可行性。
The coding technology in Galileo system is more and more important. In this study, the spreading-spectrum technology was applied to Galileo system; the channel characteristics were discussed and simulated with the excellent stochastic and orthogonal performances. Simulation results indicated that the attenuation of channel was less than -40 dB, which had reached the specification of CDMA2000，thereby, it had simplified the complexity of Pseudo-Noise（PN） code generation, and had unified the usage of chaos sequence in the source signal and channel coding. The way of PN sequence replaced by chaos spreading-spectrum technology applied in Galileo system is feasible and practical.
出处
《信息与电子工程》
2010年第2期128-133,共6页
information and electronic engineering
基金
上海市教委科研资助项目(07ZZ102
08YZ109)
