A Combined Filter for Synchronous Detection in Underwater Acoustic Mobile Communication System

一种适用于水声移动通信同步检测的组合滤波器

¹ School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China
² School of Electronic Information and Artificial Intelligence, Shaanxi University of Science and Technology, Xi'an 710021, China

Received: 8 October 2019

Abstract

A scale-stretching combined filter is proposed for underwater acoustic mobile communication receivers. The combined filter consists of the sum of signals with different time stretching and shifting. Based on the matched filtering theory, Doppler stretching scales, time shift, and the order of each component of the combined filter are derived. The method proposed in this paper improves the matching degree of the filter with wideband Doppler echo signals with different moving speeds. Simulation results show that the combined filter proposed in this paper can improve the detection probability and synchronization time estimation accuracy of wideband Doppler echo. In addition, the combined filter proposed in this paper has the same calculation amount as the matched filter. This feature makes this filter suitable for the synchronous detection of underwater acoustic mobile communication with real-time operation and low power consumption requirements.

摘要

提出了尺度展缩组合滤波器作为移动通信接收机的滤波器，该组合滤波器由不同时间展缩及时移的信号之和组成，并依据匹配滤波理论推导了组合滤波器各组分的多普勒展缩尺度、时移、以及组合滤波器的阶数，提高了滤波器与不同运动速度的宽带多普勒回波信号的匹配度。仿真结果表明文中所提出的组合滤波器可提高宽带多普勒回波时的检测概率及同步时间估计精度，且所提方法与匹配滤波器的运算相同，适合于实时、低功耗要求的移动移动水声通信的同步检测。