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A Study on Time Synchronization Method for Analyzing the Network Performance of Remote Control System

원격운용 시스템의 네트워크 성능분석을 위한 시간동기화 방안에 관한 연구

  • Yang, DongWon (Ground Technology Research Institute(GTRI), Agency for Defense Development(ADD)) ;
  • Kim, Namgon (Ground Technology Research Institute(GTRI), Agency for Defense Development(ADD)) ;
  • Kim, Dojong (Ground Technology Research Institute(GTRI), Agency for Defense Development(ADD))
  • Received : 2022.02.02
  • Accepted : 2022.05.17
  • Published : 2022.06.30

Abstract

With the development of artificial intelligence and unmanned technologies, the remote surveillance/autonomous driving systems have been actively researched. For an effective performance analysis of the developed remote control system, it is important to record the data of it in real time. In addition, in order to analyze the performance between the control system and the remote system, the recorded data from them should be synchronized with time. In this paper we proposed a novel time synchronization method for the remote control system. The proposed remote control system satisfies the time difference of the recorded data within 1 ms, and we can reduce the time difference by using a CPU shielding and affinity setting. The performance of the proposed method was proved through various network data storage experiments. And the experiments confirmed that the proposed method can be applied to recording devices of unmanned ground vehicles and control vehicles. The proposed method will be used as a method for analyzing network data of UGV-R (Unmanned Ground Vehicle - Reconnaissance).

인공지능 및 무인 감시, 자율화 기술의 발전으로 인해 무인으로 운용되는 원격 감시/자율 주행 시스템의 개발이 활발히 연구되고 있다. 개발되는 원격운용 및 제어 시스템의 효과적인 성능분석을 위해서는 원격운용 시스템의 데이터를 실시간으로 기록하고 그 데이터를 분석하는 일이 중요하다. 또한, 통제 시스템과 원격 시스템 간의 성능분석을 위해서는 각 시스템의 기록데이터 간 시간동기화가 필수적으로 요구된다. 본 논문에서는 원격운용 시스템의 기록데이터 분석을 위한 GPS 기반 시간동기화 설계 방안을 제시한다. 제안 방법은 기록데이터에 GPS 신호를 활용한 정밀한 시간정보를 기록함으로써 원격 시스템이 기록데이터 시간 오차를 1ms 이내로 만족할 수 있도록 하였으며, OS 내 설정을 통해 이더넷 통신을 특정 CPU가 전담하도록 하는 CPU shielding 및 affinity 설정 기법을 통해 시간동기화 성능을 개선하였다. 제안 방법은 단계별 실험 및 네트워크 데이터 저장 실험을 통해서 그 성능을 입증하였으며, 무인수색차량의 무인차량과 통제차량 기록장치에 적용할 수 있음을 확인하였다. 제안 방법은 향후 무인수색차량의 네트워크 데이터 분석 방법으로 활용할 예정이며, 활용 중에 발생하는 다양한 분석을 통해 성능 개선을 해 나갈 예정이다.

Keywords

References

  1. DongWon Yang, "Detail-Enhanced Target Segmentation Method for Thermal Video Sequences based on Spatiotemporal Parameter Update Techniques," IET Image Processing, vol.13, no.1, pp.216-223, 2019. DOI: 10.1049/iet-ipr.2018.5341
  2. TaeGil Ha, Jongin Lim, DongWon Yang, Jun Hee Lee, Dokyung Kim, Jinyoung Choi, "Moving Object Detection Using Multi-resolution Attention Mechanism," Journal of the Institute of Electronics and Information Engineers(IEIE), vol.56, no.3, pp.81-93, 2019. DOI: 10.5573/ieie.2019.56.3.81
  3. Jaehoon Choi, Daeyeong Kim, DongWon Yang, Jun Hee Lee, Dokyung Kim, Changick Kim, "Channel Pruning using Scaling Factor of Batch Normalization in Compact Networks," Journal of the Institute of Electronics and Information Engineers(IEIE), vol.56, no.3, pp.292-299, 2019. DOI: 10.5573/ieie.2019.56.3.81
  4. Dojong Kim, Namgon Kim, DongWon Yang, "Real Time Network Implementation for Military Unmanned Ground Vehicle based on Standard Ethernet," Journal of KIIT. Vol.19, No.10, pp. 45-55, 2021. DOI: 10.14801/jkiit.2021.19.10.45
  5. D. L. Mills, "Internet time synchronization: the network time protocol," IEEE Transactions on Communications, vol.39, no.10, pp.1482-1493, 1991. DOI: 10.1109/26.103043
  6. M. Langer, K. Teichel, D. Sibold and R. Bermbach, "Time synchronization performance using the network time security protocol," 2018 European Frequency and Time Forum(EFTF), pp. 138-144, 2018. DOI: 10.1109/EFTF.2018.8409017
  7. R. L. Scheiterer, C. Na, D. Obradovic and G. Steindl, "Synchronization Performance of the Precision Time Protocol in Industrial Automation Networks," in IEEE Transactions on Instrumentation and Measurement, vol.58, no.6, pp.1849-1857, 2009. DOI: 10.1109/TIM.2009.2013655
  8. H. G. Berns and R. J. Wilkes, "GPS time synchronization system for K2K," 1999 IEEE Conference on Real-Time Computer Applications in Nuclear Particle and Plasma Physics. 11th IEEE NPSS Real Time Conference. Conference Record (Cat. No.99EX295), pp.480-483, Sante Fe, 1999.
  9. H. G. Berns, T. H. Burnett, R. Gran and R. J. Wilkes, "GPS time synchronization in schoolnetwork cosmic ray detectors," in IEEE Transactions on Nuclear Science, vol.51, no.3, pp.848-853, 2004. DOI: 10.1109/TNS.2004.829368
  10. A. Khalajmehrabadi, N. Gatsis, D. Akopian and A. F. Taha, "Real-Time Rejection and Mitigation of Time Synchronization Attacks on the Global Positioning System," in IEEE Transactions on Industrial Electronics, vol.65, no.8, pp.6425-6435, 2018. DOI: 10.1109/tie.2017.2787581
  11. David Baston, "Comparison of Real-time Network Performance of RedHawkTM Linux 7.5.2 and RedHat Operating Systems," A Concurrent Real-Time White Paper, pp.1-7, 2019.