Design On Wireless Buoy Node Of Passive Acoustic Positioning System

Passive tracking technology does not call for cooperate signal source on the target, and would improve naval shooting trial efficiency greatly. Traditional passive tracking systems are restricted by such facts as low ranging precision and slow tracking speed, so did not become main force for equip finalizing trial. As the new underwater weapon coming forth, old systems are incapable of detecting and tracking the underwater targets' three-dimensional tracks. So a schedule has been brought out to build a locating and tracking system with high performance aiming at disoperative underwater target.Passive acoustic positioning system can measure the high speed targets' three-dimension tracks in real time. Data are exchanged by radio-communication between buoys and information processing center. The high reliability and low false code ratio of radio communication ensures that the system track the targets accurately. The content of the dissertation is focused on the design of wireless buoy nodes of the passive acoustic positioning system, which includes three parts:1. The buoy communication system's hardware circuit is designed and the interface protocol is realized. On the basis of the components property, the physical communication interface is developed with FPGA, and the interface protocol between DSP and spread spectrum radio station, DSP and GPS, DSP and other peripheral equipments is integrated into a FPGA chip, which make the hardware scale smaller, the power consumption decreased and the system reliability improved.2. The TDMA communication protocol is established and realized on DSP. The DSP program is modularized with each module independent, which enhances the readability and makes the modification convenient.3. The microwave transmission characteristics are studied combined with experimental results, which shows that the simulation model based on dual (direct wave and reflected wave) propagation model were consistent with the real facts. The results can forecast the operating range of radio-communication.