Design And Implementation Of The Air-Ground Datalink Communication System For Validation

Air-Ground Datalink communication has been widely applied in civil aviation because of its fasttransmission, strong anti-jamming feature and large data traffic. The Air-Ground Datalink system isthe standard configuration of large civil airplane, master the core technology is one of the key tasksduring the large civil airplane development. However, at the present stage, since Air-Ground Datalinkequipment is monopolized by foreign companies, and the domestic relevant technology is notdeveloped enough, both the hardware facilities and application are restricted. Therefore, this paperwill study the knowledge about Air-Ground Datalink communication, with the hope of getting out ofthe current dilemma, so as to support the self-developed airplane project, and further promote thehomemade ability of civil aviation facilities.In order to solve the source problem of testing data, this paper has analyzed the differencebetween encoding ways of ACARS signals and typical MSK signals based on ARINC618protocol,ensured the mapping relation of their conversion and proved their1-1correspondence. After that, theauthor comes up with the modulation and demodulation method based on MSK signals for ACARSsignals, and realizes the message reception and dispatch by using this method.Currently the Air-Ground Datalink equipment is open to customer application rather thanairplane research and design institute; meanwhile the closure of message data is harmful forsecond-development. In this situation, thanks to the real-time advantage of the Air-Ground Datalink,this paper will develope an Air-Ground Datalink Real-Time Analysis System to support the testingdemand of airplane design institute. The difference analysis with the existing air-ground datalinksystem in civil aviation was done for grasping the key requirements based on the comprehension ofthe requirements in design institute. With the support of design institute, the Real-Time AnalysisSystem can make configuration of the request instruction and the design of inherent parameters.Through the combination of parameters, multi-formed pattern of message or request can betransmitted to the aircraft to get different kind of data in order to meet the real-time and variousrequirements in the test procedure. The Real-Time Analysis System also consist of the subsystem suchas message decoding, real-time moniting and alerting and data management, which were operatedwith each other to fulfill the system requirement.