CAJ | 학술논문

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。
관대다보륵성납채용중복상위편마신호화복협방차산법，상대우착대기술대대제고료측량정도。논문분석료관대다보륵성납적계통결구화공작원리，개소료복협방차방법，통과대호시수거적분석，연구료다보륵성납접수도적신호특성，분석료시역파형화포락，지출료회파수선이혼향위주，경과일정적연시후접수적신호이한대백조성위주；분석료해저회파적폭도특정병채용활동보구고계분석료접수적정개시역신호적속도특정。분석료조성적개솔밀도화공솔보，병여고사백조성비교，득도관대다보륵성납접수도적조성근사복종고사분포적결론。
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 broad‐band Doppler sonar and introduce complex covariance method .According to the analysis of lake experiment data ,characteris‐tics of signal received by receiver are analyzed .Wave and envelope in time domain are analyzed .