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


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.


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


  1. K. H. Lee, The Use of Airforce Microwave, "The Magazine of the IEEE", Vol. 1, No. 1, pp.61-71, 1963.
  2. W. L. Garfield, "TACAN: a navigation system for aircraft", Proceeding of the IEEE - Part B: Radio and Electronic Engineering, Vol. 105, Issue9, Part S, pp.298-306, 1958.
  3. S. J. Park and K. H. Koo, "Optimization of Broadband Antenna Parasitic Elements for TACAN", Journal of Korean Institute of Electromagnetic Engineering and Science, Vol. 26, No. 5, pp.483-491, 2015.
  4. DNC News, Updated Business Project Plan of a Portable TACAN from the 55th Policyand Planning Subcommittee, etc.
  5. S. H. Dodington, "Development of 1000-mHz Distance Measuring" IEEE Transactions on Aerospace and Electronic Systems, Vol. ANS-16, NO. 4, pp.533-540, 1980.
  6. T. W. Kim and J. Grabowski, "Validation of GPS L5 coexistence with DME/TACAN and link-16 systems", Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003), pp.1455-1469, 2003.
  7. T. H. Kim, "Study on Structure and Performance Improvement of TACAN(Tactical Air Navigation) Antenna", Kwangwoon University, 2010.
  8. M. T. Decker, "Tacan Coverage and Channel Requirements" IRE Transactions on Aeronautical and Navigational Electronics, Vol. ANE-4, Issue 4, pp.135-143, 1957.
  9. Korea Office of Civil Aviation at MOLIT, "Theory and Practice of Checkout Flight for navigation safety facility(1)" VOR / DME / TACAN, National Archive, Policy Information, 2005.
  10. W. T. De and T. Latimer, "Azimuth Errors of the TACAN System" Aeronautical and Navigational Electronics, IRE Trans, Vol.ANE-3, Issue 4, pp.150-156, 1956.
  11. MIL-STD-291C, "Standards Tactical Air Navigation Signal" Dept. of Defense Interface Standard, 10 Feb. 1988.
  12. Rantec Document, "Technical Manual for TACAN ANTENNA GROUP" 30 June. 1935.
  13. H. von Viebahn, H. Brandtberg, "Advances in Avionics and Navigation Systems" International Council of the Aeronautical Sciences 2006, pp. 7-9, 2006.
  14. L. D. Van, C. T, Lin, Y. C. Yu, "Digital Signal Processing" IEICE transactions on fundamentals of electronics, communications and computer sciences Vol. 90 No. 8, pp. 1644-1652, 2007.
  15. Y. H. Seo, H. J. Chio and D. W. Kim, "FPGA Design of Digital Circuit for TACAN", Korea Institute Of Communication Sciences, Vol. 35, No. 12, pp.1775-1782, 2010.
  16. J. S. Lim and G. S. Chae, Analysis of Direction Finding Accuracy for Amplitude-Phase Comparison and Correlative Interferometer Method. Journal of Digital Convergence, Vol. 14, No. 1, pp.195-201, 2016.
  17. S. W. Lee, A Study on 8kbps PC-MPC by Using Position Compensation Method of Multi-Pulse, Journal of Digital Convergence, Vol. 11, No. 5, pp.285-290, 2013.
  18. S. H. Lee, N. S. Park, K. H. Lee, A remote device authentication scheme in M2M communications, Journal of Digital Convergence, Vol. 11, No. 2, pp.309-316, 2013.
  19. Joong-Soo Lim, Gyoo-Soo Chae, Min-Nyun Kim, Young-Ho Kim, "Analysis of DOP using Radionavigation Transmitter", Journal of the Korea Convergence Society, Vol. 2, No. 2, pp. 7-12, 2011.
  20. AutJunyan TAN ,Virginie FRESSE ,Frederic ROUSSEAU, A Generic Design Flow for the Generation of a Dedicated Emulation Noc-Based Plateform on FPGA, Journal of Small & Medium Business Convergence Society, Vol. 1, No. 1, pp.221-230, 2014.