### 一种低复杂度的极低信噪比高动态信号载波粗捕获算法

1. 北京航空航天大学 电子信息工程学院, 北京 100191
• 收稿日期:2012-04-26 修回日期:2012-10-08 出版日期:2013-03-25 发布日期:2013-03-29
• 通讯作者: 刘荣科,Tel.: 010-82339482 E-mail: rongke_liu@buaa.edu.cn E-mail:rongke_liu@buaa.edu.cn
• 作者简介:段瑞枫 女, 博士研究生。主要研究方向: 通信与测控中的接收技术, 编码调制技术。 Tel: 010-82339715 E-mail: drffighting2008@163.com;刘荣科 男, 博士, 教授, 博士生导师。主要研究方向: 空天信息传输与处理, 无线多媒体通信, 专用集成电路设计。 Tel: 010-82339482 E-mail: rongke_liu@buaa.edu.cn
• 基金资助:

中央高校基本科研业务费专项资金(YWF-10-01-B24)

### A Low-complexity Coarse Carrier Acquisition Algorithm for Signals with Extremely Low Signal Noise Ratio and High Dynamics

DUAN Ruifeng, LIU Rongke, ZHOU You, WANG Runxin, HOU Yi

1. School of Electronic and Information Engineering, Beihang University, Beijing 100191, China
• Received:2012-04-26 Revised:2012-10-08 Online:2013-03-25 Published:2013-03-29
• Supported by:

The Fundamental Research Funds for the Central Universities (YWF-10-01-B24)

Abstract:

A improved carrier acquisition algorithm for signals with extremely low signal noise ratio and high dynamics is proposed. After padding extra zeroes to the signal, the algorithm shifts signal's frequency spectrum to compensate for the Doppler rate of carrier, which overcomes the high computational complexity in traditional time-domain matching-average periodogram algorithm. Its computational complexity decreases in proportion with the ratio of the number of matched branches against the quantity of zero padding, but without performance degradation. In addition, the design method of key parameters related to performance and complexity is also presented. Simulations are performed when the signal noise ratio (SNR) is -41 dB (carrier-to-noise ratio C/N0 is 18 dBHz), Doppler frequency varies from -300 to 300 kHz, Doppler rate ranges from -800 to 800 kHz/s and data rate is 20 bps. The results show that the proposed algorithm reaches the same performance as the original algorithm does, with frequency accuracy being ±12 Hz, Doppler rate being ±25 Hz/s and acquisition probability being over 90%. The performance meets the demand of carrier tracking. The acquisition time of proposed algorithm increases by about 8% while its computational complexity decreases by 70% compared to the original algorithm.