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Proceedings Paper

The SpaceWire-based thermal infrared imager system for asteroid sample return mission HAYABUSA2
Author(s): Hisashi Otake; Tatsuaki Okada; Ryu Funase; Hiroki Hihara; Junpei Sano; Kaori Iwase; Ryoichi Kashikawa; Isamu Higashino; Tetsuya Masuda
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Paper Abstract

Thermal infrared imager system is developed for HAYABUSA2, which is planned to be launched in 2014 and aims at sample-return from a C class near-Earth asteroid 1999JU3 considered to contain organic or hydrated materials. The system consists of a thermal-infrared imager (TIR) and a digital electronics, which is used not only for the scientific investigation of physical properties of the asteroid surface, but also for the assessment of landing site selection and safe descent operation onto the asteroid surface with in situ measurement. Since round trip communication time between the asteroid and the Earth is more than thirty minutes, onboard automatic data processing function and high speed data recording capability are provided to exploit the limited downlink capacity which is up to 32kbps. TIR adopts an uncooled bolometer with 320 x 240 effective pixels. Image operations as multiple images summation, dark image subtraction, and the compensation of dead pixels are processed onboard. A processing module is connected to sensor interfaces through SpaceWire in order to provide deterministic processing time. Data compression is also provided to reduce restriction on storage capacity and operation time, which provides the equivalent compression ratio as JPEG2000 in 1/30 processing time in average. A high speed data recorder is also connected through SpaceWire in 50Mbps in order to record TIR data in parallel with other sensor data. The modularity of SpaceWire enables to use as built devices for TIR and inherits the same design as the long-wavelength infrared imager developed for the Venus climate orbiter Akatsuki.

Paper Details

Date Published: 19 September 2013
PDF: 8 pages
Proc. SPIE 8867, Infrared Remote Sensing and Instrumentation XXI, 88670F (19 September 2013);
Show Author Affiliations
Hisashi Otake, Japan Aerospace Exploration Agency (Japan)
Tatsuaki Okada, Japan Aerospace Exploration Agency (Japan)
Ryu Funase, The Univ. of Tokyo (Japan)
Hiroki Hihara, NEC TOSHIBA Space Systems, Ltd. (Japan)
Junpei Sano, NEC TOSHIBA Space Systems, Ltd. (Japan)
Kaori Iwase, NEC TOSHIBA Space Systems, Ltd. (Japan)
Ryoichi Kashikawa, NEC TOSHIBA Space Systems, Ltd. (Japan)
Isamu Higashino, NEC TOSHIBA Space Systems, Ltd. (Japan)
Tetsuya Masuda, NEC Corp. (Japan)

Published in SPIE Proceedings Vol. 8867:
Infrared Remote Sensing and Instrumentation XXI
Marija Strojnik Scholl; Gonzalo Páez, Editor(s)

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