基于形态滤波的水声通信信号同步检测方法

Synchronous Detection Method of Underwater Acoustic Communication Signal Based on Morphological Filtering

摘要:

针对水声通信过程中拷贝相关同步检测在不同信道环境下相关峰值差距较大，通过单一固定门限同步检测导致信号误检率、漏检率高的问题，设计了一种信号同步检测帧结构，在传统拷贝相关同步检测信号前加入三单音信号，结合形态学滤波技术，提出了一种新的水声通信信号同步检测方法，实现了不同信道环境和通信距离下单一固定门限检测值的水声通信信号同步检测，降低了信号同步检测的误检和漏检概率。 实际海试结果表明：在 5 km，7 km，10 km 不同通信距离和信道环境下该方法均可实现信号同步检测，信号的误检概率和漏检概率均为 0。

关键词:水声通信;形态滤波;同步检测;拷贝相关;三单音

Abstract:

Aiming at the problem that the correlation peak difference of copy correlation synchronous detection is large in different channel environments in the process of underwater acoustic communication，and the signal false detection rate and missed detection rate are high through a single fixed threshold synchronous detection，a signal synchronous detection frame structure is designed. Three tone signals are added before the traditional copy correlation synchronous detection signal. Combined with morphological filtering technology，a new synchronous detection method of underwater acoustic communication signal is proposed，which realizes the synchronous detection of underwater acoustic communication signal with a single fixed threshold detection value under different channel environment and communication distance，and reduces the probability of false detection and missed detection. The actual sea trial results show that this method can achieve signal synchronous detection under different channel environments and at communication distances of 5km，7km and 10km，and the probability of false detection and missed detection are both 0.

Key words:underwater acoustic communication;morphological filtering;synchronous detection;copy related;three tone