| 彭聪,龙慧波,王雷,张舒皓.COSTAS波形的主动声呐近似相干处理方法*[J].,2024,43(5):1141-1151 |
| COSTAS波形的主动声呐近似相干处理方法* |
| Active Sonar Approximate Coherence Processing Method Based on COSTAS Waveform |
| 投稿时间：2023-06-04 修订日期：2024-09-04 |
| 中文摘要: |
| 为了提升探测处理增益，有效对抗水声信道的频率选择性衰落，本文提出了一种基于COSTAS波形的主动声呐新算法。本文首先分析了相干融合的原理，然后基于相近频率经历近似相干信道的假设，提出了将近似相干融合应用于声呐回波信号处理，具体实现方式为如下步骤：1.通过频域波束形成提升回波增益；2.通过归一化匹配滤波进行相关处理；3将匹配滤波后的不同频率的复数进行加权求和，加权系数由信噪比决定。经过仿真表明，本文提出的近似相干算法的接收机(ROC)曲线明显优于非相干处理；同时，湖试结果证明，近似相干方法比现有的非相干处理方法有更高的处理增益，增益提升5dB~9dB。 |
| 英文摘要: |
| In order to improve the detection of detection processing, effective against the frequency selectivity of the water channel, this text proposed a new algorithm based on the COSTAS waveform. This article first analyzes the principle of coherent fusion, and then based on the assumption that similar frequencies experience approximately coherent channels, it proposes to apply approximate coherent fusion to sonar echo signal processing. The specific implementation method is as follows: 1. Enhance the echo through frequency domain beamforming Wave gain; 2. Correlation processing through normalized matching filtering; 3. Weighted summation of complex numbers of different frequencies after matching filtering, and the weighting coefficient is determined by the signal-to-noise ratio. Simulation shows that the receiver (ROC) curve of the approximate coherent algorithm proposed in this article is significantly better than that of non-coherent processing; at the same time, the lake test results prove that the approximately coherent method has a higher processing gain than the existing non-coherent processing method. The gain is increased by 5-9dB. |
| DOI：10.11684/j.issn.1000-310X.2024.05.024 |
| 中文关键词: COSTAS信号 水声探测 主动声呐探测 频率选择性衰落 高增益 |
| 英文关键词: COSTAS signal Underwater acoustic detection Active sonar detection Frequency selective fading High gain |
| 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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