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VELOX-CI Tropical Climate Satellite


VELOX-CI is a satellite program funded by EDB. The objective is to develop and launch a tropical weather monitoring satellite into a near equatorial orbit to take advantage of a high revisit rate over Singapore.

Scope of the program

  • Development of ​a 3D atmospheric measurement payload comprises of a GPS occultation module and radio frequency probe
  • Radiation tolerance computer board using hybrid hardware and software redundancy
  • Hybrid Attitude Determination System (ADS) using GPS measurement
  • Real-time star tracking algorithm for attitude determination
Orbit ​Near equatorial orbit, altitude 550 km
Mission Life 3 years
Dimensions 615mm x 608mm x 848mm
Mass 123 kg
​Attitude Knowledge l​ess than 0.2 degree @ 3 sigma
​Pointing Accuracy ​less than 2 degree @ 3 sigma
Solar Panels​ ​24 series x 10 strings for 3 panels
Battery Capacity​ ​20Ah @EOL​
​RF Link ​S-band Up/Downlink (32 kbps, BPSK)
X-band Down-link (160Mbps)
Paylo​ads​ ​Radio occultation payload
Experimental RF probe​
​Radio Occultation Payload
​EQM Vibration Test 
Star tracki​ng software
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