Design Of The Data Link System And Reseach On Simulation Platform Of Small Unmanned Helicopter

In recent years, UAVs have found more and more wide use in civilian applications. Asfor small unmanned helicopter, because of its small size, flexible movement and convenientmanipulation, also the features of hovering, autonomous takeoff and landing, it has been usedin the fields of aerial photography, topographic mapping, power line and disaster detectionand so on. The flight control subsystem and the data link subsystem are the most importantcomponents in the UAV system. The data link system mainly completes the transfer of databetween components of the UAV system, so the focus on designing is to ensure the reliabilityof data transmission and improve the transmission distance. Due to the high cost and highrisk of the real UAV testing, flight simulation has become the essential part of development ofthe flight control system. The subject builds simulation platform for UAV in the laboratory,which can not only debug the controller parameters, but also achieve the planning tomuti-target track points.First of all, the paper introduces the UAV platform in the laboratory and the entirehardware architecture of UAV system, then analyzes the composition of UAV data linksystem, compares the characteristics of four data-link models, and studies the theory ofcommunication channel and antenna. At last, we select the hardware equipments anddetermine the overall hardware design of the data link system.Next is the overall software design of the data link system. We complete thesoft-decoding of the remote control channel information in the subordinate machine module,study the content and format of DGPS data, and realize uploading the two types ofinformation at the same time based on digital radio link mode. The host machine modulecompletes the analysis and separation of the data received from the subordinate machinemodule. In the end, we realize the communication between the application computerCM-T3530and Ground Station based on WLAN link mode.The last part is research and construction of UAV simulation platform èwhich mainly isdeveloped based on Autopilot and FlightGear open source software. According to the featuresof them,we construct flight control simulation system based on Autopilot and visual displayinterface based on FlightGear, and complete UDP communication between them.