Video And Control Signal Transmission System Of UAV ANETs Based On FPGA

The ANETs is one of the fast-communication methods,which has several advantages such as simple equipment,wide coverage,real-time transmission,and fast self-assembling.However,it has a problem of low transmission bandwidth.Therefore,a new architecture of ANETs is designed based on cable UAVs(unmanned aerial vehicle)in high altitude as base stations in this thesis,in which the base station and land commanding vehicle are connected by optical fibers,and the multi-device ANETs wireless transmission has been implemented.The range of the ANETs has been extended using superior channel characteristics of UAV communication and the problem of bandwidth limitation has been solved by the wide bandwidth and low loss of optical fibers.In this way a wide-range network can be built quickly without a communication network environment.Consequently,it has a great practical value and is applicable to some military applications.The hardware design of the ANETs communication device has been implemented in this thesis,which could be divided in the following two parts:1.The hardware design between the land commanding vehicle and UAV base station:each of them embarks a PCB(Printed Circuit Board)based on a FPGA(Field Programmable Gate Array).The optical fiber is used to implement the communication between two PCBs,and the data is transmitted transparently.The PCB designed in this thesis has several interfaces applicable to various signaling protocols and could be used to transmit different signals for diverse functions.The communication data is scheduled and 8B/10B encoded/decoded by the FPGA and multi-protocol parallel signals could be transferred into serial signals.2.The hardware design for the wireless transmission of control signals inside the ANETs:long-distance transmission of control signals is implemented by using the LoRa(Long Range)frequency-spreading transmission technology.According to the parametric analysis of LoRa,the best scheme is selected and the schematic diagram is finished.In the end of this thesis,following conclusions are drawn through the test of the new ANETs:1.The maximum parallel transmission rate of multiple signals between the land commanding vehicle and UAV base station can reach 1.25 Gbps.The transmission bandwidth is greatly increased.2.The maximum transmission distance of the control signal through the LoRa module is about 4.5 kilometers within a city,and the maximum land-surface transmission distance in the ideal environment is about 15.1 kilometers.The wireless control range is effectively extended.