| The shipboard node in the underwater acoustic remote control system is used for sendingremote commands to dominate the unmanned underwater vehicle (UUV), when UUV getsinto emergency or other circumstances during the experiment at sea. The alarm informationand status message sent by UUV actively can also be received by the shipboard node to makesure the barrier-free communication between UUV and ship.First, the technology development and research status of underwater acousticcommunication at home and abroad is reviewed, and the characteristics and impact of theunderwater acoustic channel is analyzed. The working principle and encoding form of theshipboard node in the underwater acoustic remote control system is introduced. The basicprinciple of relational technologies are discussed, including the relevant synchronization andchannel estimation based on cope correlation, the Doppler estimation and compensation basedon phase difference correction on discrete spectrum, and the information code detection basedon RAKE receiver technology, and the performance of these technologies are analyzedthrough MATLAB simulation.Then, based on the CCS3.3development platforms, the software design, implementationand debugging of shipboard nodes, which is designed by C language, have been completed bythe hardware platform on OMAP_L137processor core chip. Combining the hardwareplatform resources, a block diagram of the shipboard nodes and software process of signalprocessing are given, the role of the various functional modules and design ideas of thesoftware are also discussed in detail, including pre-processing, signal transmission, signalprocessing, data transmission. The distribution and management of the processor storageresources as well as the interrupt are mentioned in simple. At last, the software of system isproved to be effective and feasible by electric and pool debugging and lake experiment. |
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