【作者】 李萍；

【导师】 程刚；

【作者基本信息】 西北工业大学 ， 检测技术与自动化装置， 2003， 硕士

【摘要】 水雷作为一种重要的战略武器，其新型品种远程遥控水雷的研制已成为各国海洋工程领域的研究热点。信息在发射机和水雷之间的可靠传输，离不开水声远程信息传输技术的发展，因此，远程水声信道特性的分析尤为重要。本文对远程遥控水雷系统将要应用的水声信道的传播特性进行了分析，在对远程水声信道特性进行全面分析的基础上，通过理论分析、计算机仿真、硬件电路的实验等对目标海域信道的水文参数、声场分析所用的声场模型、声传播特性和遥控接收系统性能指标进行了系统、深入的研究。本文的主要研究工作及所取得的成果如下： 1．系统、深入地研究了水声信道特性及其对水声远程信息传输系统的影响；从声纳方程出发，确定了系统的最佳工作频段；在声传播损失计算的基础上，给出了声源级的预报；基于时变信道理论，描述了远程水声信道的衰落特性。以上研究为最佳系统的设计和技术参数的选取提供了重要的依据。 2．研究了基于声线理论的水声信道声场模型，分析并仿真了在多种不同声速条件下的声线传播以及不同海底状况下的声传播；结合相干多途信道的系统函数，通过求取本征声线进行了水声信道响应的预测。 3．分析了远程遥控接收系统的参数如接收机输入信噪比、接收机灵敏度、自动增益和接收机通带带宽等，并对遥控接收系统性能指标进行了估算，为远程遥控接收机的设计提供了一定的理论依据。 4．结合对水声信道特性和远程遥控接收系统的分析，进行了远程遥控接收机的设计，包括接收机低噪声前置放大器的设计、带通滤波器电路的设计和集成以及自动增益控制电路的设计，最后对接收机模拟电路进行了调试。更多还原

【Abstract】 As an important stratagemical weapon, a new type mine, the long-range remote control mine, has become a hot research area in oceanic engineering. The efficient and reliable information transmission between transmitter and the mine greatly relies upon the development of long-range underwater acoustic information transmission techniques,so the analysis of the characteristics of underwater acoustic is absolutely necessary. The dissertation is devoted to the study on the characteristics of underwater acoustic channels for mine. Based on the comprehensive analysis on the characteristics of underwater acoustic channels, the research on the parameters of target sea area,the acoustic model, the characteristics of underwater acoustic transmission and the parameters of capability of long-range remote control receiving system is systematically conducted through theoretical analysis, computer simulation and testing of circuit. The main results and achivements are as follows:1. The propagation characteristics of underwater acoustic channels and their influences on long-range information transmission are studied thoroughly. Based on the sonar equation, the optimal frequency band is abtained. From the calculation about transmission loss,the source level is forecasted .Based on the random time varying channel theory, the fading characteristics of long-range underwater acoustic channels are analyzed. Then the important reference are provided for the optimal system design and technical parameters selecting of long-range underwater acoustic information transmission system.2. The underwater acoustic channel model based on ray theory is studied, and in combination with the system function of coherent multi-path channel, the method for underwater acoustic channel response prediction through eigenrays finding is obtained.3. The parameters of the long-range remote control receiving system are analyzed and simulated thoroughly, such as the signal to noise ratio(SNR) atthe receiver,the delicacy of receiver, auto-gain and band-width of the pass-band. Then the important references are provided for the design of long-range remote control receiver.4. According to the analyses of underwater acoustic channel and long-range remote control receiving system, we designed the long-range remote control receiver, including a low noise prefix-amplifier, a band pass filter and an auto-gain control circuit. Finally, the analog part of the receiver is tested and the frequency response of this receiving system is obtained..更多还原