扩展经验正交函数沿海声层析的声速反演

为了实现沿岸海域声速的实时连续监测，针对目前单收发换能器沿海声层析系统的剖面反演声线不足和接收信号不稳定的问题，提出了双收发换能器沿海声层析（Double-transcever Coast Acoustical Tomography，DCAT）系统。通过计算机进行仿真模拟，结果表明DCAT系统声速反演精度提高了一个数量级，验证了该系统对存在问题的改善及其有效性。在声速反演过程中，通过使用扩展经验正交函数（Extension Empirical Orthogonal Function，EEOF）表示声速剖面，实现了剖面全水深的声速反演。DCAT系统的提出和EEOF方法的应用，为海上实时连续观测系统的建立及数据处理，提供了理论基础和有效的实施方法。

The sound velocity inversion by EEOF coast acoustical tomography

In order to realize the real-time continuous monitoring of sound speed along coastal waters, a Double-transcever Coast Acoustical Tomography (DCAT) system is proposed in this paper. The main purpose to do so is to solve the problem on the insufficiency of acoustic ray inversion and the instability of receiving signal in the existing single-transcever coastal acoustic tomography system. The results obtained by computer simulation show that the sound speed inversion precision of DCAT system can be improved by one order of magnitude, which verifies the effectiveness of the system. In the process of sound speed inversion, the Extended Empirical Orthogonal Function (EEOF) is used to represent the sound speed profile and to realize the sound speed inversion of the whole water depth of the section. The DCAT system and EEOF method provide a theoretical basis and an effective way for the establishment and data processing of the real-time continuous observation system.