基于截获因子的直序扩频水声通信隐蔽性能分析  

Covert performance analysis of direct-sequence spread-spectrum underwater acoustic communication based on interception factor

作　　者：柳文明 韩树平[1] 李厚全[1] 董永峰[1] 

机构地区：[1]海军潜艇学院,青岛266199

出　　处：《南京大学学报（自然科学版）》2017年第4期654-660,共7页Journal of Nanjing University（Natural Science）

基　　金：中国博士后基金(2014M552658)

摘　　要：研究了对数正态衰落水声信道条件下直接序列扩频通信的隐蔽性能.首先建立水声隐蔽通信系统模型,提出了基于可检测距离的截获因子作为衡量水声通信系统隐蔽性的方法.理论研究了直接序列扩频信号经过对数正态衰落水声信道传输后,截获接收机能量检测工作特性以及通信接收机同步相关检测特性和扩频通信误码性能.仿真分析了不同的信道衰减参数及信号参数、调制方式等对水声通信系统隐蔽性能的影响.仿真结果表明:在对数正态衰落水声信道条件下,直序扩频通信具有低截获通信能力;在一定条件下,降低发射载波频率、增大信号时间带宽积、降低调制阶数和通信速率将有利于提升水声通信隐蔽性;浅海信道比深海信道更利于隐蔽通信,近程水声通信比中远程通信更容易实现隐蔽.The covert performance of direct-sequence spread-spectrum（DSSS）communication under the condition of the log-normal fading underwater acoustic channel was investigated in this paper.Firstly,the model of covert underwater acoustic communication system was established,the interception factor based on the detectable acoustic communication distance was proposed as the method to measure the covert performance of the underwater acoustic communication system.When the DSSS communication signal was transmitted through the log-normal fading underwater acoustic communication channel,the receiver operating characteristic（ROC）of the energy intercepted receiver was investigated theoretically,as well as the ROC of the synchronization detection and the Bit Error Rate（BER）of the DSSS using the communication receiver.The influences of different underwater acoustic communication channel attenuation parameters,acoustic communication signal parameters and modulation types of the acoustic signal were analyzed theoretically and simulated base on intercept factor.The simulation results show that under the condition of logarithmic normal distribution fading underwater acoustic communication channel,DSSS communication has the lowprobability of intercepting communication capability;under certain conditions,reducing the emission carrier frequency,increasing time-bandwidth product,reducing the communication modulation order or communication rate of the acoustic communication signal will be beneficial to improve the covert performance of underwater acoustic communication system;shallow sea acoustic communication channel is more conducive to the realization of underwater covert communication than deep sea,as well as the short-distance channel is easier to achieve covert underwater acoustic communication than long-distance underwater acoustic channel.

关 键 词：水声通信 直接序列扩频 截获因子 隐蔽性能 

分 类 号：TP181[自动化与计算机技术—控制理论与控制工程]