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基于双曲调频信号的水声通信帧同步方法
A frame synchronization method of underwater acoustic communication based on hyperbolic frequency modulated signal
- DOI:
- 作者:
- 陈永兴, 王中, 樊书宏, 岳玲
CHEN Yong-xing, WANG Zhong, FAN Shu-hong, YUE Ling
- 作者单位:
- 中国船舶集团有限公司 第七〇五研究所，陕西 西安 710077
The 705 Research Institute of CSSC, Xi′an 710077, China
- 关键词:
- 双曲调频信号;多普勒效应;水声通信;帧同步
hyperbolic frequency modulated signal; Doppler effect; underwater acoustic communication; frame synchronization
- 摘要:
- 水声通信中收发两端的相对运动会引起多普勒效应，严重的多普勒效应将极大地影响通信系统性能。针对多普勒效应对水声通信信号的影响问题，利用双曲调频信号对多普勒频移的不敏感性，提出了一种基于时域叠加上扫频和下扫频双曲调频信号作为前导信号的水声通信帧同步方法。通过接收端配置2个并行相关器对带有前导信号的接收信号进行匹配滤波，并根据2个相关峰的偏移时延差实现精确的多普勒因子估计，利用线性插值方法进行重采样，减弱多普勒效应对水声通信性能的影响。仿真结果表明，在实测多途信道条件下，该方法可以实现多普勒因子精确估计，有效提高收发端相对高速运动条件下的水声通信性能。
In underwater acoustic communications system, Doppler effect caused by the relative motion of the transmitter and receiver will seriously deteriorate the performance of the communication system. Aiming at the influence of Doppler effect on underwater acoustic communication signals, the insensitivity of hyperbolic frequency modulated (HFM) signals to Doppler frequency shift is used. Then we propose an underwater acoustic communication frame synchronization method based on time-domain superposition of up-sweep and down-sweep HFM signals as preamble signals. Two parallel correlators are configured on receiver to perform matched filtering on the received signal with the preamble signal, and accurate Doppler factor estimation can be achieved according to the offset time delay difference of the two correlation peaks. The linear interpolation method is used for resampling to reduce the influence of Doppler effect on the performance of underwater acoustic communication. The simulation results show that the method can realize Doppler factor estimation accurately in the measured multipath channel, and effectively improve the performance of underwater acoustic communication under the condition of relatively high-speed motion of the transceiver.
2023,45(3): 111-116 收稿日期：2022-07-13
DOI：10.3404/j.issn.1672-7649.2023.03.020
分类号：U666
基金项目：军科委基础加强计划项目（2019-JCJQ-ZD-020）
作者简介：陈永兴(1998-),男,硕士研究生,研究方向为水声通信技术
