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TACAN modulation generator for antenna purpose that precisely adjusts factor of modulation

변조도를 정밀하게 조정 하는 TACAN 안테나용 변조신호발생기

  • Kim, Jong-Won (Dept. of Computer Science & Engineering, Kongju National University) ;
  • Son, Kyong-Sik (Dept. of Computer Science & Engineering, Kongju National University) ;
  • Lim, Jae-Hyun (Dept. of Computer Science & Engineering, Kongju National University)
  • 김종원 (공주대학교 컴퓨터공학과) ;
  • 손경식 (공주대학교 컴퓨터공학과) ;
  • 임재현 (공주대학교 컴퓨터공학과)
  • Received : 2017.02.27
  • Accepted : 2017.04.20
  • Published : 2017.04.28

Abstract

TACAN(TACtical Air Navigation) was created to support military aircraft's short range navigation (200~300 mile). TACAN must fulfill a condition of MIL-STD-291C, the U.S. Military Standards, which addresses the sum of 15Hz and 135Hz should be within 55%, following the factor of modulations for both to be $21{\pm}9%$ each. Within the existing TACAN antenna, modulation factor for 15Hz and 135Hz are created differently depending on its diameter, wavelength, angle of gradient, internal modulation method or using frequency code. It brings up a problem where applications needed to be stopped and repaired when modulating signal exceeds the standard of MIL-STD-291C since the existing TACAN antenna does not have coordination function. Hence, plan and produce a modulating signal generator using FPGA, and check the changes in the modulation factor for 15HZ and 135Hz, depending on the values that have been set in each criteria. Moreover, allow the modulating signal generator to be automatically adjusted based on the monitoring signal emitted by antenna, and place alarm sound just in case if it exceeds the standard.

Keywords

TACAN;Antenna;Azimuth information;Modulating signal;Modulation factor

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