摘要
宽带多普勒声纳采用重复相位编码信号和复协方差算法,相对于窄带技术大大提高了测量精度。论文分析了宽带多普勒声纳的系统结构和工作原理,介绍了复协方差方法,通过对湖试数据的分析,研究了多普勒声纳接收到的信号特性,分析了时域波形和包络,指出了回波首先以混响为主,经过一定的延时后接收的信号以限带白噪声为主;分析了海底回波的幅度特征并采用滑动谱矩估计分析了接收的整个时域信号的速度特征。分析了噪声的概率密度和功率谱,并与高斯白噪声比较,得到宽带多普勒声纳接收到的噪声近似服从高斯分布的结论。
Broadband Doppler sonar measures velocity relative to sea bottom according to Doppler effect and has been used in the navigation of multiple carriers.It increases the measurement accuracy compared with narrowband technique by phase coded technique and pulse-pulse correlation technique.The paper analyses the system structure and principles of broadband Doppler sonar and introduce complex covariance method.According to the analysis of lake experiment data,characteristics of signal received by receiver are analyzed.Wave and envelope in time domain are analyzed.
出处
《舰船电子工程》
2014年第11期157-160,共4页
Ship Electronic Engineering
关键词
声学
多普勒
系统原理
回波特性
acoustic
Doppler sonar
system principle
echo characteristic
