Research On Video Signal Simulation Technology Of TACAN Beacon

TACAN beacon simulator(TACAN beacon simulator),a special testing equipment,is often used in the verification of indicators and measurement traceability of TACAN system.The simulator is a special signal source necessary for the development,production,debugging,measurement and calibration of TACAN airborne equipment.It is used to simulate the real TACAN beacon station to provide simulated distance information and simulated azimuth information for airborne equipment,and test and verify its channel identification,pattern recognition,distance indicator and azimuth index.TACAN beacon simulator is often used to check whether the airborne equipment works normally before and after the flight,so the development of the simulator and the effective traceability of its indicators are of great significance.In this paper,the basic principle of distance measurement and location measurement of TACAN system and the video signal format of TACAN beacon are studied,and the hardware structure of video signal simulation of TACAN beacon is analyzed based on the specific design requirements,and the overall technical scheme is put forward.This paper focuses on the analysis and design of the video signal part of TACAN beacon,and a design and implementation scheme of video signal using FPGA is proposed.According to the emphases and difficulties of the research work,this paper discusses the technologies of inquiry signal recognition and timing point extraction,the realization technology of beacon encoder,the realization technology of primary and secondary reference pulse group coding,the realization technology of random pulse coding,the realization of hybrid encoder,the realization of pulse to encoder,the generation of bell pulse and the technology of space amplitude modulation Description.Combined with the general instrument platform,the analog output of TACAN signal is realized,and its main technical indexes are verified.The measurement scheme of channel frequency,waveform parameters,time interval,distance parameters and azimuth parameters is designed,and The uncertainty of measurement results is analyzed and evaluated.The results show that the design index is achieved.