Design Of Receiver And Transponder In Ultra Short Base Line Positioning System

Ultra Short Base Line Positioning System realizes positioning, tracking and data transmission of the underwater targets, using the technology of underwater acoustic positioning. As the system is small-size, easy-installed and low-cost, it has bright future of application in the underwater positioning field. The hardware of receiver and transponder of the system is designed in this thesis, and the software of transponder is also developed.In order to get excellent phase consistency among channels, many factors are taken into account in the process of receiver design, such as type of filter, circuit layout and accuracy of component. At the same time, the calculation of component values is discussed, and the design parameters are presented. During the design of underwater acoustic transponder, with a view of high reliability and low power consumption, peripherals of MSP430F1611 are fully utilized to accomplish watch circuit. While the arithmetic of MCU software is simulated, the digital filtering is realized with the use of adaptive notch filter, and the program of signal detecting is also accomplished. Considering the communication function demand of the system, circuit of signal processing is designed, which consists of data sampling, signal processing, data storage, signal transformation and interrupt controlling, and underwater acoustic communication among targets is achieved with it.As the software of MSP430F1611 and circuits run well in the experiment, the predefined requirements are fulfilled.