| 1. | Ocean acoustic remote sensing
海洋声波遥感 |
| 2. | Ocean acoustic tomography
海洋声层析成相 |
| 3. | Ocean acoustic tomography is an important question in underwater acoustic
海洋声层析是水声研究领域一个重要的研究课题。 |
| 4. | Modeling the acoustic field with proper sound propagation model is necessary for the research on sound propagation in the sea and is the basis of ocean acoustic tomography
研究海洋中的声传播需要选择适当的传播模型对海洋环境进行建模，精确的传播模型也是海洋声层析研究的基础。 |
| 5. | Underwater - radio buoy system for use as obtaining the ocean ' s acoustical parameters is primary for investigating ocean acoustic condition , obtaining and recording acoustic propagation experimentation data
海洋环境参数获取浮标监测系统主要用于海洋水声环境的综合考察，获取和记录水声传播试验数据。 |
| 6. | Ray model is one of the conventional sound propagation models , which is simple , intuitionistic and suitable for all kinds of signals and can work in range - dependent environments . so ray model which is used in modeling the acoustic field is an important sound propagation model of ocean acoustic tomography
射线声学简单、直观，适用于各种信号，并且可以计算介质参数随距离变化情况下的声场，因此，射线声学模型也是海洋声层析研究中重要的声场建模方法。 |
| 7. | In the study of environment model - based processing , the thesis presents a signal enhancement method based on combination of the ocean acoustic propagation , measurement system and noise models . furthermore , a signal enhancement algorithm is developed on the basis of the model - based identifer ( mbid ) implemented by the the augmented gauss - markov process and corrsponding extended kalman filter
本文通过了对模基信号处理实现信号增强的理论研究，提出了一种利用传播模型、噪声模型和阵测量模型、并注重环境信息来实现水声信号增强的方法，继而实现了基于增广高斯?马尔可夫过程和相应的扩展卡尔曼滤波联合的模基辨识器的信号增强算法。 |
| 8. | The main contributions are as follows : ( 1 ) de ( differential evolution ) algorithm is proposed to invert the ocean acoustic parameters in shallow water in order to get faster and more accurate results than ga ( genetic algorithm ) and sa ( simulated annealing algorithm ) . also a posteriori probability analysis method is applied to evaluate the uncertainty of inversion results . ( 2 ) maximum likelihood objective functions for broadband mfi are derived according to different conditions
( 2 )根据不同的前提条件，采用似然比的方法推导了宽带匹配场反演的最大似然目标函数；深入地研究了宽带匹配场处理中的相干与非相干问题；在分析参数反演的敏感性之后，提出了浅海环境参数宽带匹配场反演的多步优化策略，并与全参数反演方法进行了性能上的仿真比较。 |
| 9. | By analyzing and processing the underwater sound signals received on the array , we can get the parameters of ocean environment . compared with traditional methods of direct point measurement , ocean acoustic tomography has obvious advantages : much simpler and more effective , and it can continuously monitor ocean environment in a large area for a long time
海洋声层析技术通过分析处理水声接收基阵接收到的海洋信道中的水声信号来反演海洋环境参数，这种方法方便、高效并且可以进行长时间的大范围连续监测，与传统的直接测量的方法相比有明显的优势。 |
