Design Of Integrated Fishery Communication Platform Based On Ad Hoc

The marine economy has always been an important part of the national economy.Due to the variable climate environment at sea,radio station became an important guarantee for the safety of offshore work ships.With the improvement of material living standards,except for traditional voice communications and security assurance,multimedia transmission and internet services are also demanded for fishery radio stations.This requires the fishery radio station to have a wider communication bandwidth and stronger computing processing capabilities.Considering that there is no fixed base station in the marine communication environment and the ships are mobile,the Ad hoc network is very suitable for marine communication.This thesis first introduces the development status of fishery radio stations and marine Ad hoc networks.The demand for hardware equipment of the current offshore Ad hoc network is analyzed,and the advantages and disadvantages of the existing equipment are discussed.Then,according to the actual needs,an integrated fishery communication platform based on Ad hoc network is proposed,and the software and hardware of the platform are implemented and tested.The main content and results of this thesis are as follows: 1.A low-speed communication module is designed to realize the low-speed communication mode of the integrated communication platform.The maximum communication rate is 800 kbps,which can realize the transmission of voice,pictures and low-quality video.The module is compatible with the existing 30 MHz fishery radio station.The hardware design uses SI4463 chip as the core,which has the characteristics of low cost and low system complexity.As the fact of low communication rate and narrowband characters of SI4463,this thesis proposes a method of using multiple chips,which improves the data transmission efficiency and speed of SI4463.The bit error rate of the low-speed communication module is analyzed through theory and the actual test is carried out.Finally,the video transmission function of the low-speed communication mode was verified.2.A high-speed communication module is designed to realize the high-speed communication mode of the integrated communication platform.The module works in the frequency band around 400 MHz,with maximum communication distance of 20 km and maximum communication rate not less than 100 Mbps.Utilizing the PL part of the Zynq chip and its external AD9361 chip,this module realizes the modulation and demodulation of OFDM and QAM,and can change the communication distance by adjusting the gain of the power amplifier.The specific parameters of OFDM in the maritime communication scenario are analyzed and obtained.3.An integrated fishery communication platform based on Zynq platform is designed.The platform has two modules,the high-speed communication module and the low-speed communication module.It supports Ad hoc networking among communication platforms,and provides standard Ethernet and Wi-Fi access services to external equipment.By running the Linux operating system and writing corresponding drivers in the PS part of the Zynq chip,the realization of a simple Ad hoc routing protocol,the communication test of the highspeed and low-speed communication modules,and the actual test of the Ethernet port are completed.The test results of the system indicate that the design of integrated fishery communication platform in this thesis achieve the designed target and has the capability of Ad hoc networking.