Toshinori Kuwahara1)*, Kazuya Yoshida1), Yuji Sakamoto1

Toshinori Kuwahara1)*, Kazuya Yoshida1), Yuji Sakamoto1), Yoshihiro Tomioka1), Kazufumi Fukuda1), Nobuo Sugimura1), Junichi Kurihara2), Tetsuya Fukuhara2), Yukihiro Takahashi2)

1) Tohoku University, Japan 2) Hokkaido University, Japan

August 13, 2013 1

Micro-satellite Development Activity in Japan Micro-satellite missions planned in 2013  H-IIA Piggyback (ALOS-2)  SPROUT: Nihon University  RISING-2: Tohoku University  UNIFORM-1: Wakayama University  SOCRATES: AES Co., Ltd.

 H-IIA Piggyback (GPM)  STARS-II: Kagawa University  TeikyoSat-3: Teikyo University  ShindaiSat: Shinsyu University  KSAT2: Kagoshima University  INVADER: Tama Art University  OPUSAT: Osaka Prefecture University  ITF-1: University of Tsukuba

 Others  Several 50kg-class microsatellites © JAXA

2 SPRITE-SAT (44kg) Micro-satellite Development at SRL

#1：SPRITE-SAT (RISING-1)  Launch: Jan. 2009 (H-IIA)  Demonstration of © JAXA  Image acquisitions by mission camera RISING-2 (42kg)  Coarse attitude control  Deployment of the boom #2：RISING-2  FM ready. Launch in 2013 (H-IIA)  Mission  Multi-spectrum observation with a Liquid Crystal Tunable Filter (650-1000nm) RAIKO (2.6kg)  High resolution stereo images of cumulonimbus  Terrestrial luminous events in upper atmosphere #3：RAIKO  Launch: July 2012 (H-IIB) (Deployment from the ISS: Oct. 2012)  Mission RISESAT (55kg)  Technology demonstrations (Communication URX, S, Ku, Image acquisition, De-orbit) #4：RISESAT  Launch (2013 ~)  Mission  International Scientific Missions  Satellite-to-ground laser communication 3 Comparison of Attitude Control Systems RISING-1 RISING-2 RISESAT (SPRITE -SAT)

Gravity-gradient 3-axes stabilization 3-axes stabilization stabilization - Magnetic torquers - Magnetic torquers - boom - Reaction wheels (3) - Reaction wheels (4) (4-skew) - Magnetic torquers + Spin Stabilization (Safe mode) 4 Micro-satellites: RISING-2/RISESAT

RISING-2 FM

RISESAT EM

5 High Precision Telescope  Earth observation  5-m resolution Cassegrain telescope system  Multi-spectrum observation with a Liquid Crystal Tunable Filter  RISING-2: 650-1000 nm (+ RGB)

 RISESAT: 400-1000 nm (2 LCTFs) © Hokkaido University  Scientific observations  High resolution stereo images of the Earth  Astronomical observations

 Expected achievements  Vegetation monitoring  Investigation of mechanism of cumulonimbus and guerrilla heavy rains (constellation with RISING-2)  observation of, e.g. worldwide disasters 6 RISING-2 RISESAT

7 Missions – RISING-2 (2013~)  Scientific Earth observations  high resolution stereo images of cumulonimbus  terrestrial luminous events in upper atmosphere

© google  Expected achievements  reveal the mechanism of cumulonimbus and guerrilla heavy rains  reveal the mechanism of terrestrial luminous events in upper atmosphere  quick observation of, e.g. worldwide disasters

8 RISING-2: Observation Target / Mission Instruments Cumulonimbus Terrestrial luminous events

High Precision Telescope Bolometer Array Wide Field CCD Lightning and Sprite [HPT] [BOL] [WFC] CMOS Imager [LSI] 9 RISING-2: Payload Instruments

BOL HPT SHU

LSI WFC

10 Mission Objectives Scientific Missions Engineering Missions S1. Astronomical Observation with HPT (NCU) E1. High performance three axes attitude control  Successor of PRISING-2’ HPT  Enable accurate scientific observation LCTF(s) will be installed  Sensors and Actuators partly newly  designed/developed. S2. Earth Observation with HPT (NCU)  Achieve robustness and high reliability S3. Meteor Detection with DOTCam (NCKU) E2. New Development of Panel Deployment  Detect Meteor/ Lightning/ TLE at the night Mechanism side  Tohoku University’ original development. S4. Ocean Observation with OOC (TBC)  Improve power generation performance for higher scientific observation/experiment capability  Three to four filters for ocean observation with wide FOV. E3. New Development of Thin Film Deployment Mechanism S5. Radiation Environment Monitoring with 3 axis  De-orbit after mission completion Dosimeter (KFKI) E4. Micro-monitoring camera  Silicon detector with 4 coverage π  Visual intuitive operation  Mapping of radiation environment E5. High-speed downlink in X-band  Dual observation with another TriTel on ISS. E6. Redundant and robust main computer S6. Radiation Environment Monitoring with  Higher reliability and strategic new technology Particle Counter (IEAP) demonstration  Detection of charged particles E7. Store&Forward demonstration S7. Micro Magnetic Field Sensor (ASTC)  Receive upcoming information from distributed sensor network  Originally sicneitif mission planned.  Re- Application in global monitoring expected arranged as engineering mission.  E8. Advanced optical communication S8. Store&Forward  Collaborative research topic between NICT and  Global environment monitoring with distributed Tohoku University. sensors.  Downlink of real scientific data  International partner wanted. 11 RISESAT: Payload Instruments Camera Instruments Sensor Instruments

High Precision Telescope Meteor counter TriTel – 3D Dosimeter - HPT - DOTCam (Hungary) (Taiwan(NCU)) (Taiwan(NCKU))

TIMEPIX – Particle counter (Czech)

Ocean Observation Camera - OOC (Hokkaido University) Technology Demonstration MEMS Magnetometer (Sweden) Laser Communication Transmitter VSOTA (NICT, Japan)

12 SHU RISESAT: Scientific Payload Instrument

TriTel

μMAG

HPT OOC

HPT-DPU

DOTCam TIMEPIX 13 Applications:

14 Ground Evaluation of HPT  Sample images taken with LCTF in indicated three different wavelengths  Pictures are taken by an UAV. A ground pixel resolution of 5m is reproduced by post image processing.

15 Communication Network

receive data (2.4Mbps)

receive data receive data (38.4kbps) (38.4kbps)

User

(Fukui, Japan)

16 Summary and Outlook  Scientific payload instruments aboard the micro-satellites RISING-2 and RISESAT are introduced. Constellational Earth observation especially by means of their optical payload instruments is planned.

 RISING-2 and RISESAT are both planned to be launched into low Earth sun-synchronous orbits and aim to conduct constellational Earth observations in the fields of agriculture, fishery, forestry, wildfire, planetary physics, and possibly more.

 Different types of on-board instruments will be utilized in a combinational manner to complement spatial resolution and spectral range of particular areas of interest on Earth to provide valuable data set for scientific Earth observations and technological investigations.

 Instruments for RISING-2 were fully qualified, and those for RISESAT are arranged as international collaborative missions, which will be qualified and whose flight models are manufactured in Japanese fiscal year of 2013. The obtained payload data is planned to be partly opened to scientific communities. 17 Thank you for your attention.