Verification of the Timing System for the X-ray Imaging and Spectroscopy Mission in the GPS Unsynchronized Mode
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| Format: | Preprint |
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2025
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| _version_ | 1866916775693647872 |
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| author | Shidatsu, Megumi Terada, Yukikatsu Kominato, Takashi Kato, So Sato, Ryohei Sakama, Minami Shioiri, Takumi Motogami, Yugo Niida, Yuuki Kang, Chulsoo Takagi, Toshihiro Nakamoto, Taichi Natsukari, Chikara Tashiro, Makoto S. Toda, Kenichi Maejima, Hironori Watanabe, Shin Iizuka, Ryo Sato, Rie Baluta, Chris Hayashi, Katsuhiro Yoshida, Tessei Ogawa, Shoji Kanemaru, Yoshiaki Fukushima, Kotaro Hoshino, Akio Takahashi, Hiromitsu Nobukawa, Masayoshi Mizuno, Tsunefumi Nakazawa, Kazuhiro Uno, Shinichiro Ebisawa, Ken Eguchi, Satoshi Katsuda, Satoru Kubota, Aya Ota, Naomi Tanimoto, Atsushi Terashima, Yuichi Tsuboi, Yohko Uchida, Yuusuke Uchiyama, Hideki Yamauchi, Shigeo Yoneyama, Tomokage Yamada, Satoshi Uchida, Nagomi Holland, Matt Loewenstein, Michael Yaqoob, Tahir Miller, Eric D. Hill, Robert S. Perez-Solis, Efrain C. Waddy, Morgan D. Mekosh, Mark Fox, Joseph B. Brewer, Isabella S. Aldoretta, Emily Mukai, Koji Hamaguchi, Kenji Mernier, Francois Ogorzalek, Anna Pottschmidt, Katja Yukita, Mihoko |
| author_facet | Shidatsu, Megumi Terada, Yukikatsu Kominato, Takashi Kato, So Sato, Ryohei Sakama, Minami Shioiri, Takumi Motogami, Yugo Niida, Yuuki Kang, Chulsoo Takagi, Toshihiro Nakamoto, Taichi Natsukari, Chikara Tashiro, Makoto S. Toda, Kenichi Maejima, Hironori Watanabe, Shin Iizuka, Ryo Sato, Rie Baluta, Chris Hayashi, Katsuhiro Yoshida, Tessei Ogawa, Shoji Kanemaru, Yoshiaki Fukushima, Kotaro Hoshino, Akio Takahashi, Hiromitsu Nobukawa, Masayoshi Mizuno, Tsunefumi Nakazawa, Kazuhiro Uno, Shinichiro Ebisawa, Ken Eguchi, Satoshi Katsuda, Satoru Kubota, Aya Ota, Naomi Tanimoto, Atsushi Terashima, Yuichi Tsuboi, Yohko Uchida, Yuusuke Uchiyama, Hideki Yamauchi, Shigeo Yoneyama, Tomokage Yamada, Satoshi Uchida, Nagomi Holland, Matt Loewenstein, Michael Yaqoob, Tahir Miller, Eric D. Hill, Robert S. Perez-Solis, Efrain C. Waddy, Morgan D. Mekosh, Mark Fox, Joseph B. Brewer, Isabella S. Aldoretta, Emily Mukai, Koji Hamaguchi, Kenji Mernier, Francois Ogorzalek, Anna Pottschmidt, Katja Yukita, Mihoko |
| contents | We report the results from the ground and on-orbit verifications of the XRISM timing system when the satellite clock is not synchronized to the GPS time. In this case, the time is determined by a free-run quartz oscillator of the clock, whose frequency changes depending on its temperature. In the thermal vacuum test performed in 2022, we obtained the GPS unsynchronized mode data and the temperature-versus-clock frequency trend. Comparing the time values calculated from the data and the true GPS times when the data were obtained, we confirmed that the requirement (within a 350 $μ$s error in the absolute time, accounting for both the spacecraft bus system and the ground system) was satisfied in the temperature conditions of the thermal vacuum test. We also simulated the variation of the timing accuracy in the on-orbit temperature conditions using the Hitomi on-orbit temperature data and found that the error remained within the requirement over $\sim 3 \times 10^{5}$ s. The on-orbit tests were conducted in 2023 September and October as part of the bus system checkout. The temperature versus clock frequency trend remained unchanged from that obtained in the thermal vacuum test and the observed time drift was consistent with that expected from the trend. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_02967 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Verification of the Timing System for the X-ray Imaging and Spectroscopy Mission in the GPS Unsynchronized Mode Shidatsu, Megumi Terada, Yukikatsu Kominato, Takashi Kato, So Sato, Ryohei Sakama, Minami Shioiri, Takumi Motogami, Yugo Niida, Yuuki Kang, Chulsoo Takagi, Toshihiro Nakamoto, Taichi Natsukari, Chikara Tashiro, Makoto S. Toda, Kenichi Maejima, Hironori Watanabe, Shin Iizuka, Ryo Sato, Rie Baluta, Chris Hayashi, Katsuhiro Yoshida, Tessei Ogawa, Shoji Kanemaru, Yoshiaki Fukushima, Kotaro Hoshino, Akio Takahashi, Hiromitsu Nobukawa, Masayoshi Mizuno, Tsunefumi Nakazawa, Kazuhiro Uno, Shinichiro Ebisawa, Ken Eguchi, Satoshi Katsuda, Satoru Kubota, Aya Ota, Naomi Tanimoto, Atsushi Terashima, Yuichi Tsuboi, Yohko Uchida, Yuusuke Uchiyama, Hideki Yamauchi, Shigeo Yoneyama, Tomokage Yamada, Satoshi Uchida, Nagomi Holland, Matt Loewenstein, Michael Yaqoob, Tahir Miller, Eric D. Hill, Robert S. Perez-Solis, Efrain C. Waddy, Morgan D. Mekosh, Mark Fox, Joseph B. Brewer, Isabella S. Aldoretta, Emily Mukai, Koji Hamaguchi, Kenji Mernier, Francois Ogorzalek, Anna Pottschmidt, Katja Yukita, Mihoko Instrumentation and Methods for Astrophysics We report the results from the ground and on-orbit verifications of the XRISM timing system when the satellite clock is not synchronized to the GPS time. In this case, the time is determined by a free-run quartz oscillator of the clock, whose frequency changes depending on its temperature. In the thermal vacuum test performed in 2022, we obtained the GPS unsynchronized mode data and the temperature-versus-clock frequency trend. Comparing the time values calculated from the data and the true GPS times when the data were obtained, we confirmed that the requirement (within a 350 $μ$s error in the absolute time, accounting for both the spacecraft bus system and the ground system) was satisfied in the temperature conditions of the thermal vacuum test. We also simulated the variation of the timing accuracy in the on-orbit temperature conditions using the Hitomi on-orbit temperature data and found that the error remained within the requirement over $\sim 3 \times 10^{5}$ s. The on-orbit tests were conducted in 2023 September and October as part of the bus system checkout. The temperature versus clock frequency trend remained unchanged from that obtained in the thermal vacuum test and the observed time drift was consistent with that expected from the trend. |
| title | Verification of the Timing System for the X-ray Imaging and Spectroscopy Mission in the GPS Unsynchronized Mode |
| topic | Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2506.02967 |