Simulation Of Test Environment For Aircraft VHF Communication System

Radio waves are affected by obstacles in the transmission process,which may lead to the problems of aircraft communication signal distortion and data analysis error.The traditional ground test equipment of communication system can not simulate the channel situation in the process of aircraft flight,but the cost of test flight is high and the repeatability is low.The test environment simulation system can simulate the transmission process of aircraft communication signal and analyze the results,which is the key technology link of communication signal test.Therefore,it is of great significance to build the test environment based on the simulation of communication channel in the test of aircraft communication system.Firstly,the track data information of longitude,latitude and altitude was extracted,and the communication channel scene was divided according to the track data.Then the neural network algorithm was used to fill in the missing or wrong data in the track database,and the channel scene parameters of the complete data were calculated.Secondly,in the ground,low altitude and cruise scenarios,the influence of multipath effects caused by large objects and complex terrain on aircraft communication signals was discussed,and the common channel model modeling and simulation were realized.Finally,based on Matlab GUI software,a complete set of test environment simulation and simulation system of aircraft VHF communication system was designed.The modulation,demodulation,filtering and channel environment simulation of VHF communication signals were completed.Taking a section of voice as the test signal,observed the change of the signal after passing through the channel.The experimental simulation results were consistent with the theoretical analysis,which verifies the correctness of the communication system test environment simulation.By simulating the test environment of aircraft VHF communication system,the system can more easily verify the influence of channel environment on communication signals.It further enriches the ground test means of communication system and improves the troubleshooting ability of avionics testers.