水下通信中信号跟踪方法的抗干扰设计

陈林

摘 要： 针对传统的水下通信信号跟踪方法根据点观测信息对当前信号状态实施预测，对数据信噪比较为敏感，存在较高的误码率和较低的抗噪性能，设计一种抗干扰性强的水下通信信号跟踪方法。通过分块的信道跟踪方法对实际信道进行实时跟踪，减缓时变对信道的冲击，在跟踪的信道中采用弱小目标信号的检测前跟踪方法，将原始数据作为观测数据，利用跟踪算法预计目标状态，再对目标状态进行检测判决，有利于低信号噪音在高信噪比条件下的能量积累，提高目标检测性能，实现高噪声水下环境中通信信号的准确跟踪。实验结果说明，所提方法能够准确跟踪水下通信信号，具有较低的误码率，抗噪性能高。

关键词： 水下通信； 信号跟踪； 抗干扰； 弱目标； 信道跟踪； 抗噪性能

中图分类号： TN911.4?34； TP391 文献标识码： A 文章编号： 1004?373X（2018）07?0012?04

Anti?jamming design of signal tracking method in underwater communication

CHEN Lin

（School of Information Engineering， Suqian College， Suqian 223800， China）

Abstract： The traditional tracking method of underwater communication signal used to predict the current signal status according to the point observation information is sensitive to data SNR， and has high bit error rate and low anti?noise performance. Therefore， an underwater communication signal tracking method with high anti?jamming performance was designed. The channel tracking method based on block is used to track the practical channel in real time， and reduce the time?varying impact on channel. The tracking method of weak target signal before detection is adopted in tracking channel. The original data is taken as the observation data to predict the target state by means of the tracking algorithm， and then detect and judge the target state， which are conducive to the energy accumulation of low?noise signal under high SNR condition， can improve the target detection performance， and realize the accurate tracking of communication signal in the underwater environments with high SNR. The experimental results show that the method can track the underwater communication signal accurately， and has low bit error rate and high anti?noise performance.

Keywords： underwater communication； signal tracking； anti?jamming； weak target； channel tracking； anti?noise performance

0 引 言

随着信息通信技术的快速发展，水下通信网络目标跟踪技术广泛应用在军事、检测等领域。水下通信网络受到环境复杂性的干扰，当前的跟踪方法抗干扰性较差，该课题成为相关学者研究的重点。

以分布式卡尔曼滤波算法为基础的水下通信信号跟踪方法，通过设置检测数据的门限，采集点观测信息，再基于点观测信息对当前信号状态实施跟踪。该方法对传感器获取的检测数据信噪比较为敏感，不能解决实际水下通信中的复杂环境中高信噪比的干扰，存在较高的误码率和较低的抗噪性能。……