| Presentation | 2023-03-02 Improve Correction Accuracy of Tiem Correction Sysytem Based on Tempareture Characteristics of Clock Frequency Komichi Takezawa, Naoto Hoshikawa, Atsushi Shiraki, Tomoyoshi Shimobaba, Tomoyoshi Ito, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Accurate time synchronization is required for IoT devices, but NTP and GNSS are limited by power consumption and the communication environment. High-precision crystal oscillators such as TCXOs and OCXOs are used with time synchronization systems to minimize communication and reduce power consumption. However, devices without such an oscillator cannot maintain high-precision time. In addition, it is difficult to implement an additional oscillator. We have proposed a time correction method that exploits the characteristics of clock frequency changes with temperature as a method that does not communicate with the outside world and does not require additional equipment. In previous research, time correction was performed by estimating the time drift from the CPU core temperature based on the frequency-temperature characteristics measured in a thermostatic chamber. However, the correction accuracy was not sufficient. In this study, we propose a highly accurate estimation method by adding an offset value to the time drift estimation formula. Compared with the conventional method, the experimental results show that a time correction accuracy of 39% or better is achieved. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Time Correction / CPU Core Temperature / Thermostatic Chamber / Clock Frequency / Crystal Oscillator |
| Paper # | NS2022-178 |
| Date of Issue | 2023-02-23 (NS) |
| Conference Information | |
| Committee | IN / NS |
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| Conference Date | 2023/3/2(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Okinawa Convention Centre + Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | General |
| Chair | Kunio Hato(Internet Multifeed) / Tetsuya Oishi(NTT) |
| Vice Chair | Tsutomu Murase(Nagoya Univ.) / Takumi Miyoshi(Shibaura Insti of Tech.) |
| Secretary | Tsutomu Murase(KDDI Research) / Takumi Miyoshi(Nagaoka Univ. of Tech.) |
| Assistant | / Kotaro Mihara(NTT) |
| Paper Information | |
| Registration To | Technical Committee on Information Networks / Technical Committee on Network Systems |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Improve Correction Accuracy of Tiem Correction Sysytem Based on Tempareture Characteristics of Clock Frequency |
| Sub Title (in English) | |
| Keyword(1) | Time Correction |
| Keyword(2) | CPU Core Temperature |
| Keyword(3) | Thermostatic Chamber |
| Keyword(4) | Clock Frequency |
| Keyword(5) | Crystal Oscillator |
| 1st Author's Name | Komichi Takezawa |
| 1st Author's Affiliation | National Institute of Technology, Oyama College(Oyama College) |
| 2nd Author's Name | Naoto Hoshikawa |
| 2nd Author's Affiliation | National Institute of Technology, Oyama College(Oyama College) |
| 3rd Author's Name | Atsushi Shiraki |
| 3rd Author's Affiliation | Chiba University(Chiba Univ.) |
| 4th Author's Name | Tomoyoshi Shimobaba |
| 4th Author's Affiliation | Chiba University(Chiba Univ.) |
| 5th Author's Name | Tomoyoshi Ito |
| 5th Author's Affiliation | Chiba University(Chiba Univ.) |
| Date | 2023-03-02 |
| Paper # | NS2022-178 |
| Volume (vol) | vol.122 |
| Number (no) | NS-406 |
| Page | pp.pp.65-70(NS), |
| #Pages | 6 |
| Date of Issue | 2023-02-23 (NS) |