The time assignment system of ASTRO-H

Author

Kouzu, Tomomi ; Iwase, Kaori ; Mishima, Yuki ; Terada, Yukikatsu ; Yuasa, Takayuki ; Ishisaki, Yoshitaka ; Tashiro, Makoto S. ; Kokubun, Motohide ; Ozaki, Masanobu ; Nomachi, Masaharu ; Takahashi, Tadayuki

Author_Institution

Grad. Sch. of Sci. & Eng., Saitama Univ., Sakura, Japan

fYear

2011

fDate

23-29 Oct. 2011

Firstpage

163

Lastpage

166

Abstract

ASTRO-H is an X-ray astronomy satellite to be launched in 2014. The data acquisition system of this mission is realized with a standard network protocol, SpaceWire. Although the protocol itself is well designed, a new concept to grantee the quality of service will be installed to the ASTRO-H data acquisition system. Therefore, the verification of the design of the concept is essential in the initial phase of the development. The time assignment function is one of the important issues for the SpaceWire development. The accuracy of the absolute time of about 30 μs is required from science goals. The key point of the time assignment with SpaceWire network in the ASTRO-H system is how accurately sharing the time information. In this paper, our design of the time distribution and assignment system for ASTRO-H is shown. The results of our measurements of timing accuracy are also presented to show that the design will fulfill the goal of absolute timing accuracy.

Keywords

artificial satellites; astronomical instruments; data acquisition; AD 2014; ASTRO-H; SpaceWire protocol; X-ray astronomy satellite; absolute timing accuracy; data acquisition system; time assignment system; Attitude control; Extraterrestrial measurements; Hardware; Protocols;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2011 IEEE

Conference_Location

Valencia

ISSN

1082-3654

Print_ISBN

978-1-4673-0118-3

Type

conf

DOI

10.1109/NSSMIC.2011.6154471

Filename

6154471