| 赵瑞轩,陈旗,唐劲松,陆剑雄.低信噪比下一种非合作水声通信信号载频精确估计算法*[J].,2025,44(4):1091-1098 |
| 低信噪比下一种非合作水声通信信号载频精确估计算法* |
| An accurate estimation algorithm for carrier frequency of non-cooperative hydroacoustic communication signals in low signal-to-noise ratio environments |
| 投稿时间：2024-03-22 修订日期：2025-06-24 |
| 中文摘要: |
| 为实现低信噪比下非合作水声通信信号载频的精确估计，提出一种基于频域能量均衡法的载频估计算法。该算法首先利用Welch法进行经典功率谱估计，之后将功率谱估计值与一定宽度的正负波门进行卷积，根据线性调制信号功率谱对称的特点，找出卷积最大值与最小值之间的零值对应的频率值即可得到精确的载频估计值。实验结果表明，在没有任何先验信息的情况下，该算法可以实现对二进制相移键控（BPSK）、正交相移键控（QPSK）与直接序列扩频(DSSS)信号载频的精确估计，且在低信噪比情况下仍能保持良好的估计性能。 |
| 英文摘要: |
| In order to accurately estimate the carrier frequency of non-cooperative underwater acoustic communication signals at low SNR, a carrier frequency estimation algorithm based on energy balance method in frequency domain is proposed. The algorithm firstly uses Welch method to estimate the classical power spectrum, and then convolves the estimated power spectrum with positive and negative gate of a certain width. According to the characteristics of power spectrum symmetry of linear modulated signals, the frequency corresponding to the zero value between the convolved maximum value and minimum value can be found to obtain the accurate carrier frequency estimate. The experimental results show that the proposed algorithm can accurately estimate the carrier frequency of binary phase shift keying (BPSK), quadrature phase shift keying (QPSK) and direct sequence spread spectrum (DSSS) signals without any prior information, and maintain good performance under the condition of low SNR. |
| DOI：10.11684/j.issn.1000-310X.2025.04.030 |
| 中文关键词: 非合作模式 水声通信信号 能量均衡法 载频估计 功率谱估计 |
| 英文关键词: Non-cooperative communication mode underwater acoustic communication signals Energy balance method Carrier frequency estimation Power spectrum estimation |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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