3pod

Telecommunication and Observation

Mechanism

Comat has developed an innovative antenna-pointing mechanism, in collaboration with the French Space Agency (CNES).

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3pod

telecommunications-and-observations

- Mechanism

Image 3pod
Image espace

CONTEXT

This equipment is intended for X-band telemetry downlink to be flown onboard next generations of Earth Observation satellites. The Tripod orients a Ø220 mm high-gain parabolic X-band antenna.

Main benefits

  • A unique parallel architecture offering 3 degrees of freedom (Azimuth, Site, Zoom)
  • Excellent agility for antenna-pointing applications
  • Infinite azimuth turns
  • Dual polarization through 2 RF cables, without slip rings
  • Very low jitter thanks to a reduced mobile mass (since the 3 actuators remain stationary on the baseplate)
  • Easy-to-use central hold-down-&-release system
  • ITAR-free
  • Compliant with ECSS standards.

Key
features

Precision

1° (worst case)

Maximum Pointing Speed in Tracking Mode

5°/s

Pointing Domain

+/-74° elevation

Initialization Time

<15 s

Station Transition Time

8 s (average) / 25 s (worst case)

Infinite Azimuth Rotation

360°

Lifetime on Low Earth Orbit

10 years

Data rate

2 Gbps with low insertion loss (< 1.5 dB@pointing system level)

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