The Design And Development Of Hardware-in-loop Simulation System For Underwater Acoustic Communication Based On SOPC Technology

Due to the influence of Underwater Acoustic Communication Channel’s highnoise, high complexity, Simplified model can not effectively simulate the actualsystem and the limitation of actual system’s high test input, low efficiency, easy to fail,over long periods. FPGA as the core controller based on SOPC technology, designand implement a semi-physical simulation of underwater acoustic communicationplatform to meet the demand for efficient underwater acoustic communication andfollow-channel coding algorithm. The paper gives the overall design concept of theHardware-In-Loop Simulation System for underwater acoustic communication, theunderlying hardware of the sending and receiving nodes underwater acousticcommunication circuit, the hardware circuit of float node and sink nodes, UnderwaterAcoustic Communication sending and receiving hardware logic, the design ofhardware-based programming software control part, the design of the PC monitoringsoftware.According to the demand of underwater acoustic communication’s high speedand the same sending interval and the same receiving, we put forward in the design ofthe "NIOSII processor+Ping-Pong RAM+sending and receiving hardwareco-processor "way of design in sending and receiving nodes. Underwater acousticdata broadcasting and receiving data information adopts ping-pong RAM data cachedesign method, reduced the CPU interrupt frequency to avoid the loss of broadcastingand receiving data information. Ping-pong operation beat each other with the switch,the buffered data stream continuously fed to the subsequent data stream computingprocessing module application, in order to achieve seamless complete the databuffering and processing objectives.The simulation test platform using modular deployment mode, which containsPC-monitoring system, the sink node, the float node, the sound of water sending andreceiving nodes. Data transmission channel using transparent transmission, which PCthrough the sink node, the float node to the forwarding mode of communication inunderwater acoustic communication between nodes is a kind of transparentcommunication data transmitted. The transparent transmission thought to facilitate the achievement of a "sea trial" or "lake test can also be convenient for laboratory testconnection directly.Based on LABVIEW platform designed for real-time monitoring of underwateracoustic communication system can meet the convenience for various operationcommands issued, field data statistics and analysis, waveform data files, display, datastorage, alarm requirements, etc.Based on the hardware-in-loop simulation system for underwater acousticcommunication, we do the experiments to test the hardware-in-loop simulation system.The results show that the system has a good performance in terms of underwateracoustic communication and has a good man-machine interactive system. This systemcan improve underwater acoustic communication technology research effectively.