【作者】 王朝英；

【导师】 吴英姿；

【作者基本信息】 哈尔滨工程大学 ， 通信与信息系统， 2007， 硕士

【摘要】 测深侧扫声纳是一种海底地形测量设备。它是在传统的水声技术和测深技术基础上改进的系统，因为其宽条带使得测量更有效率，高空间分辨率不容易错过目标或特征，输出图像显示了海底地质有价值的信息。本文在借鉴多波束测深声纳和传统侧扫声纳的基础上，给出了测深侧扫声纳声纳方程的一些技术指标和基阵设计的参数。针对多途反射和其他方向的干扰的问题，提出了相干源估计方法来分辨从不同方向的两个信号源，并将其与ESPRIT方法相比较。仿真的结果表明相干源估计方法适合相干信号模型而ESPRIT方法适合非相干信号模型，在浅水情况下两种方法的结合具有很好的性能而同时不会增加系统规模。文中还介绍了另一种估计海底回波角度的方法—相位中心比较技术。这种方法通过直接计算基阵间的相位中心的相位差来估计回波DOA，这是一种取代了参数估计方法的数学方法，算法能快速执行而产生时间序列。论文给出了仿真结果和实际数据的处理结果，对该方法的可行性进行了验证。更多还原

【Abstract】 Bathymetric sidescan sonar systems is a sort of seabed terrain surveying and mapping equipment and offer great improvement over conventional hydrographic and bathymetric techniques because their broad swath makes it possible to survey an area more efficiently, their high spatial resolution makes it less likely to miss an obstruction or feature, their image output gives valuable information about the bottom composition.In this paper, putting forward and reasoning the technical parameters of bathymetric sidescan sonar and the design of sonar array.To resolve the multipath reflection and other directional interference, a coherent source direction estimator to resolve two sources from different directions is proposed. This method is compared with the ESPRIT-based approach using different sonar data models. The simulations show that coherent source direction estimator works very well for highly coherent sources while the ESPRIT-based method is quite robust for the incoherent source signal model. The results suggest that the combination of two approaches could get a better performance in shallow water without significant increase of the system cost.A new method-the phase center comparison techniques for calculating the direction-of-arrival (DOA), and thus the bathymetry of the seafloor, is presented. This method will calculate the DOA directly from the phase difference between the phase centers of the array. The method is a numeric approach, instead of a parametric method. The bathymetry calculated can produce a real time display since this algorithm is performed quickly. Through computer simulation and trial data, the method is proved effectively.更多还原