Ocean Buoy Wireless Communication Protocol Research And System Implementation

China is a large ocean country,with a vast area of territorial waters,numerous islands,a coastline of 18,000 km,and abundant marine resources.The development of detection technologies for the marine environment will provide important technical support for China's development of the blue ocean economy and its detection through buoys.Marine environment is currently the mainstream of ocean detection technology.Dissertation addresses the shortcomings of communication distance and transmission speed of traditional buoys,the development of communication protocols based on buoys,and the design and implementation of the system.The project uses WIFI wireless communication technology instead of the traditional GPRS,satellite,ZIGBEE and other buoy communication technology to complete the data transmission between the buoy and the aircraft.Then,according to the data transmission characteristics of the project,such as reliable and non-handshaking,the reliability mechanism of relevant agreements was investigated and the communication protocol was designed.Simulation analysis and implementation were carried out.By selecting a WIFI chip with low power consumption,the communication system is designed and manufactured.The communication system includes a main module and an adaptive bidirectional power amplification module.The main module realizes the communication function,data collection and storage functions.Because of the 802.11 protocol,the output power of wifi products must not exceed 20 d Bm,making wifi coverage very small and unable to meet aircraft and buoy communication.For this problem,this paper designed an adaptive bidirectional power amplifier module working in 2.4GHz.The module includes three parts: control circuit,low noise amplification,and power amplification.By detecting the power level of the signal through the control circuit,the module can automatically switch the transceiver channel,increase the transmit signal power,increase the receiver sensitivity,and extend the communication distance.Finally,the paper presents the process of each function test and the overall system test of the power amplifier module.The test results show that the throughput of the communication protocol simulation and actual test are better than the traditional protocol,and the control circuit of the power amplifier module normally realizes the switching of the transceiver channel.The output power can reach 25.81 d Bm and the small-signal gain is 12 d B.The module can work with WIFI.The actual communication distance reaches 1.2km,maximum communication speed 5.5Mbit/S,minimum 0.3Mbit/S,indicates that the hardware system performs well.