数字式水声语音通信发射器系统的研制

利用纵振换能器的纵向振动与换能器前盖板的弯曲振动相耦合原理，采用纵振换能器与声反射器配合，研制出一种适应在复杂海洋声信道进行高速率传输，具有低频，宽带，大功率等优点的水声换能器。     

数据融合技术在多源潮汐数据分析中的应用

为了充分利用现有潮汐数据以建立高精度的潮汐分析模型，在利用最小二乘法进行潮汐分析的基础上，将数据融合技术应用于具有多源潮汐数据的分析，提出潮汐数据的分类方法，建立了三种潮汐数据融合方案，推导了各种方案的数据融合公式，并分析了各种方案的特点及适用范围。     

An attenuation-based sediment classification technique using Chirp sub-bottom profiler data and laboratory acoustic analysis

A remote sediment classification technique based on attenuation measurements from Chirp sub-bottom profiler data is described. This differs from previously published work in that attenuation measurements are obtained for each stratigraphic unit within a complex, thinly interbedded sedimentary sequence. Compressional wave attenuation measurements are obtained for a wide variety of lithologies, including muds, silts, sands, clayey sands, silty clays and gravel lags, with grain sizes ranging from 8 Phi to -4 Phi. In addition, attenuation measurements from sub-bottom profiler data were calibrated against laboratory acoustic measurements of vibracores and seabed samples from corresponding geographic locations, under simulated in-situ conditions using a Pulse Tube method. We adapt an instantaneous frequency matching method using a causal attenuation filter to model the decay of the Chirp transmitted waveform. From this modelling, a relationship between t* (a causal attenuation operator) and change in instantaneous frequency is established. The Hilbert transform is used to extract instantaneous frequency information from Chirp seismic, which is used to derive attenuation information for selected individual stratigraphic layers imaged by the sub-bottom profiler. This paper draws attention to the limitations in comparing attenuation measurements derived from Chirp sub-bottom profiler data against previously published literature on experimental attenuation measurements, which are limited by the wide variance of these data, and the difficulty in finding a meaningful best fit to these data. This demonstrates the importance of calibrating remote sediment classification observations using complimentary acoustic analysis of seabed samples to generate a site-specific geoacoustic database. A positive correlation between laboratory and sub-bottom profiler attenuation measurements was obtained, with a correlation coefficient of 0.885. Poorly sorted gravels with a mixed lithic and biogenic pebble component are characterised by very high attenuation with values of Q from 4 to 19. These sediments are considerably coarser-grained than those typically described in previously published experimental studies.     

变性水团软划分的一种FUZZY模式

在已知研究海区水团核心的前提下,考虑到各种指标对标识水团的不同贡献,提出了一种水团软划分的FUZZY模式。利用1987年5—6月黄东海的温、盐和溶解氧实测资料进行计算,与已有成果作了对比,结果令人满意。     

海洋心血管药物及活性物质的研究现状与展望

按照海洋心血管活性成分的化学分类，本文较系统地列举了该领域中的研究成果和动态，对有代表意义的重点药物作较详细的评述，并探讨了有关海洋心血管药物研究工作的特点及发展前景。     

Geometric corrections on sidescan sonar images based on bathymetry. Application with SeaMARC II and Sea Beam data

Acoustic backscatter images of the seafloor obtained with sidescan sonar systems are displayed most often using a flat bottom assumption. Whenever this assumption is not valid, pixels are mapped incorrectly in the image frame, yielding distorted representations of the seafloor. Here, such distortions are corrected by using an appropriate representation of the relief, as measured by the sonar that collected the acoustic backscatter information. In addition, all spatial filtering operations required in the pixel relocation process take the sonar geometry into account. Examples of the process are provided by data collected in the Northeastern Pacific over Fieberling Guyot with the SeaMARC II bathymetric sidescan sonar system and the Sea Beam multibeam echo-sounder. The nearly complete (90%) Sea Beam bathymetry coverage of the Guyot serves as a reference to quantify the distortions found in the backscatter images and to evaluate the accuracy of the corrections performed with SeaMARC II bathymetry. As a byproduct, the processed SeaMARC II bathymetry and the Sea Beam bathymetry adapted to the SeaMARC II sonar geometry exhibit a 35m mean-square difference over the entire area surveyed.On leave at the Naval Research Laboratory, Code 7420, Washington D.C. 20375-5350.     

长江河口北槽抛泥作业状态下的悬沙浓度分布与扩散过程

在长江河口北槽抛泥过程中，应用ASSM－Ⅰ型声学悬浮泥沙观测系统观测悬沙浓度的时空分布规律，结合多普勒流速剖面仪走航式断面流速测量。研究发现：（1）泥沙浓度垂向分布形成至少三种结构类型，即上小下大的“L”型和指数型，上大下小的“漂浮”型；（2）受抛泥泥沙输移的影响，断面流场形成低流速区，或分布在水体表、中层，或贯穿整个水体，形成流速切变锋，它们的强度随抛泥泥沙输移扩散逐渐减弱；（3）在落潮流和颗粒重力共同作用下，抛泥泥沙同时存在输移扩散和沉降过程。小潮型抛泥泥沙主要就近扩散和沉降，中潮和大潮型抛泥泥沙输移扩散范围较远。     

闽江口的盐、淡水混合

采用盐、淡水混合比的概念研究闽江口的混合状态，并确定了分层、部分混合、高度混合３种类型的分类指标。研究表明，闽江口主要水道的盐、淡水混合以部分混合为主，其次是分层，高度混合出现的机率较少；盐水异重流发育良好，混合状态的变化与潮流速的变化不相一致；盐水入侵时混合比相对较小，后退时相对较大。闽江口是一个径、潮量比值较小的强潮河口，按照一般规律，其盐、淡水混合应该出现高度混合型，但在闽江口的主汊道中发生     

Study mobile underwater positioning system with expendable and multi-functional bathythermographs

The purpose of the current study is to introduce a set of mobile underwater positioning systems (MUPS) that will enable non-offshore vessels to execute underwater missions. Besides mobility, the system would also possess the advantage of having to use fewer acoustic instruments than conventional acoustic positioning systems. The method adopted by the system will involve the use of expendable and multi-functional bathythermographs (XBT) to measure the underwater acoustic speed and the depth of water at the same time. Then it must utilize the geometric relations formed by measuring the position of underwater targets at set intervals during navigation. In addition, since sound does not travel in a straight line when underwater, the iteration and convergence method must be used to perform corrections on the transmission speed and positional errors to obtain an accurate coordinate of the underwater target. After simulation testing, the positioning system established by the current study has proven to be fast in converging the error values along with high positioning accuracy of the system. The results of the study indicate that the MUPS built by the research institute can be utilized on a vessel, and will be very helpful in assisting the management of urgent underwater positioning missions.