| 摘要: |
| 鉴于扩频测控系统宽带化带来的高速采样压力和高数据率问题，研究了基于压缩感知的直扩测控信号处理方法。通过深入分析直扩测控信号稀疏性，构造了延时-多普勒基字典，提出了基于压缩感知直扩测控信号处理框架，并针对直扩测控信号特点给出了改进正交匹配追踪重构算法，最后针对该信号处理方法的可行性和性能分别进行了仿真实验。仿真结果不仅验证了方法的可行性，同时表明可以在不影响解调性能条件下大幅度降低采样率或数据率，并具有一定的降噪效果，这将为直扩测控通信系统提供一种高效的模数转换和同步解调处理方式。 |
| 关键词: 直扩测控信号 压缩感知 延时-多普勒基字典 伯努利随机矩阵 改进正交匹配追踪算法 |
| DOI： |
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| 基金项目: |
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| DS TT&C signal processing based on compressive sensing |
| CHENG Yanhe,YANG Wenge,ZHANG Lingjun |
| () |
| Abstract: |
| In view of the high-speed sampling and high data rate pressures which come from broadband of the direct-sequence spread-spectrum tracking,telemetry and command(DS TT&C) system,a DS TT&C signal processing method based on compressive sensing(CS) is provided.Firstly,the delay-Doppler basic dictionary is built by in-depth sparse analysis of DS TT&C signal.Then,a DS TT&C signal processing framework based on CS is proposed,and the improved orthogonal matching pursuit(OMP) algorithm is provided referring to the signal.Finally,the feasibility and performance of the proposed method are investigated by simulation experiments.The results show that the method is feasible,and the sampling or data rate can be greatly reduced without degrading the demodulation performance,moreover,it can get some noise deduction effect.The technology will provide a more efficient analog digital conversion and synchronous demodulation method for DS TT&C system. |
| Key words: DS TT&C signal compressive sensing delay-Doppler basic dictionary Bernoulli random matrix improved OMP algorithm |
《电讯技术》编辑部 