Browse > Article
http://dx.doi.org/10.12673/jant.2022.26.6.441

Time Synchronization Algorithm based on FLL-Assisted-PLL for Telemetry System  

Geon-Hee Kim (R&D Center, DANAM Systems)
Mi-Hyun Jin (R&D Center, DANAM Systems)
Publication Information
Journal of Advanced Navigation Technology / v.26, no.6, 2022 , pp. 441-447 More about this Journal
Abstract
In this paper, we propose a FLL-assisted-PLL based time synchronization algorithm for telemetry systems where frequency and phase errors exist in time synchronization pulse. The telemetry system may analyze the flight state by acquiring the state information in the distributed system. Therefor, in order to collect each state information without errors, precise time synchronization between the master and the slave is required. At this time, the master's time pulse have frequency and phase changes that can be caused by external and internal factors, so a method to maintain precision time synchronization is essential to provide telemetry data continuously. We propose the FLL-assisted-PLL based algorithm that is capable of high-speed synchronization and has high time synchronization accuracy. The proposed algorithm is verified through python simulation, and the VHDL Logic has been implemented in FPGA to check the performance according to the frequency errors and phase errors.
Keywords
Discrete Time; FLL-Assisted-PLL; Field Programmable Gate Array; Telemetry system; Time Synchronization;
Citations & Related Records
연도 인용수 순위
  • Reference
1 H. S. Lee, G. S, Kim, H. S. Yoon, J. W. Yang and H. G. Lee, "Distributed Instrumentation System using Master/Salve method for the Flight Test Instrumentation," in Proceeding of the Korean Society for Aeronautical and Space Sciences, Gyeongju, pp. 661-665, Apr. 2011.
2 J. Elson, L. Girod and D. Estrin, "Fine-grained network time synchronization using reference broadcasts," in Proceeding of the fifth Symposium on Operating Systems Design and Implementation, Boston: MA, pp. 147-163, Dec. 2002.
3 S. Ganeriwal, R. Kumar and M. B. Srivastava, "Timing-sync protocol for sensor networks," in Proceeding of the 1st International Conference on Embedded Networked Sensor System, Los Angeles: CA, pp. 138-149, Nov. 2003
4 F. Sivrikaya and B. Yener, "Time synchronization in sensor networks: a survey," IEEE Network, Vol. 18, No. 4, pp. 45-50, 2004.   DOI
5 Y. G. Park, W. M. Lee and B. K. Kim, "A Proposal of Simultaneous Acquisition Performance Test Method for Telemetry System," Journal of Advanced Navigation Technology, Vol. 24, No. 3, pp. 218-223, Jun.
6 W. J. Gill, "A comparison of binary delay-lock tracking-loop implementations," in IEEE Transactions on Aerospace and Electronic Systems, Vol. AES-2, No. 4, pp. 415-424, Jul. 1966.   DOI
7 J. I. Boo, J. W. Ha, K. S. Kim and B. K. Kim, "Wireless TDD time synchronization technique considering the propagation delay between mobile vehicles," Journal of Advanced Navigation Technology, Vol. 23, No. 5, pp. 329-399, Oct. 2019.
8 Y. M. Gu, J. I. Boo, J. W. Ha and B. K. Kim, "Precision Improvement Technique of Propagation Delay Distance Measurement Using IEEE 1588 PTP." Journal of Advanced Navigation Technology, Vol. 49, No. 6, pp. 515-519, Jun. 2021.   DOI
9 G. H. Kim, M. H. Jin and B. K. Kim, "Phase Locked Loop based Time Synchronization Algorithm for Telemetry System," Journal of Advanced Navigation Technology, Vol. 24, No. 4, pp. 285-290, Aug. 2020.    DOI