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SPATIUM

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SPATIUM (Space Precision Atomic-Clock Timing Utility Mission)

The SPATIUM program is a joint collaboration between Nanyang Technological University, Singapore and Kyushu Institute of Technology, Japan. The primary scientific objective of SPATIUM program is to develop a reliable platform that derives the three-dimensional global ionosphere plasma distribution with excellent spatial and temporal resolutions. The ionosphere total electron contents (TEC) will be modeled based on multipoint measurements of phase-shift in satellite clock signal from a constellation of CubeSats carrying a high precision timing reference.

The pathfinder satellite, SPATIUM-I, was carried to the International Space Station (ISS) by KOUNOTORI HTV7 cargo transporter which was successfully launched on 23 Sep 2018. The satellite was deployed from the ISS Japanese Kibo module on 6 Oct 2018 at 15:45 pm SGT. This 2U CubeSat is the first nanosatellite in the world to successfully demonstrate a chip scale atomic clock (CSAC) working in Low Earth Orbit. This demonstrates that the ‘Built-at-NTU’ atomic clock keeps time with a stability of 0.2 billionths in a second, on a par with satellites a thousand times bigger.

 

 

Technical Fact

 Satellite Specification
 Dimension  200 mm x 100 mm x 100 mm
 Mass  2660 grams
 Expected Lifetime  12 months
 Launch Date  23 Sep 2018
 Orbit  LEO, 400 km altitude, 51.6 degree inclination
 Communication  Uplink: 401.040MHz
Downlink: 400.960MHz (Phase Modulation)
467.674MHz (Spread-Spectrum Modulation)

 CSAC Mission Board Specification
 Dimension  86.3 mm x 90 mm x 21 mm
 Mass  113 grams
 Voltage Supply  4.5 V
 Power Consumption  0.35 W
 Warm-up Time  < 180 s
 Data Interface  CSAC data: UART serial communication.
Baud rate: 57,600 bps
Operation data: UART serial communication.
Baud rate: 128,000 bps
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