摘要
北斗卫星信号作为北斗系统中必不可少的一部分,对研究北斗卫星系统有重要的理论和实际意义.以Matlab为平台,以北斗信号仿真为目标,对北斗中频信号进行了仿真与实现.首先,在研究卫星信号传播的基础上,提出了北斗中频信号仿真的总体构架.然后,在CBI码信号生成原理的基础上,对CBI码进行了Matlab仿真和验证.通过对不同卫星CBI码的相关性分析验证了仿真生成的CBI码的正确性.最后,基于扩频调制和载波调制的基本原理,采用16.367667MHz的采样率将CBI码调制到4.123968MHz的中频信号上.通过对信号时域和频域进行分析,验证了仿真信号的正确性和仿真方案的可行性.
As an essential part of the Compass system, it is important theoretical and practical significance to study the Beidou satellite signals. In this paper, in order to study the Beidou signals, the IF signal is simulated and implemented in Matlab. First, based on the satellite signal propagation model, the overall structure of the Beidou IF signal simulation is presented. Then, based on the CB[ code signal generation principle, CBI code is simulated and verified. Through correlation analysis of different satellite code, the code generated is verified by simulation is correct. Finally, based on the basic principles of spread spectrum modulation and carrier modulation, the combination code is modulated onto an intermediate frequency 4. 123968 MHz signal by using 16. 367667 MHz sampling rate. Through the analysis of the time and frequency domain of the signal, the correctness of the simulation signal and the feasibility of the simulation method are verified.
作者
代君
王晓璐
刘战合
王菁
Dai Jun Wang Xiaolu Liu Zhanhe Wang Jing(Zhengzhou Unviersity of Aeronautic)
出处
《哈尔滨师范大学自然科学学报》
CAS
2016年第3期37-41,共5页
Natural Science Journal of Harbin Normal University
基金
河南省科技厅资助(162102210237)
航空科学基金(2014ZA55001)
河南省教育厅(15A590001)
郑州航空工业管理学院青年基金项目
关键词
北斗
测距码
扩频调制
BPSK调制
Beidou
Ranging code
Spreading spectrum modulation
BPSK modulation
