Paper 13093-235
Paper 13093-235
Verification of the XRISM timing system in the GPS unsynchronized mode
19 June 2024 • 17:30 - 19:00 Japan Standard Time | Room G5, North - 1F
Abstract
We report the results from the ground and on-orbit verification of the XRISM timing system when the satellite clock is not synchronized to the GPS time. Using the thermal vacuum test data obtained in 2022 August, we have confirmed that the accuracy of the absolute time satisfies the requirement (350 us) in the GPS unsynchronized mode. On-orbit tests were also performed in 2023 September and October as part of the bus system checkout after the launch. The clock frequency versus temperature trend was found to remain unchanged from that obtained in the ground test and the observed time drift was consistent with that expected from the trend.
Presenter
Megumi Shidatsu
Ehime Univ. (Japan)
Megumi Shidatsu received her BS, MS, and PhD in science from Kyoto University in 2010, 2012, and 2015, respectively. She is an associate professor at Graduate School of Science and Engineering, Ehime University. She is a member of the Science Operations team of the X-Ray Imaging and Spectroscopy Mission (XRISM) project and has been involved in the verification of the XRISM timing system and of the ground data processing ("pre-pipeline") software that includes the time assignment tools.