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EUCLID. High gain Antenna Deployment and Pointing Mechanism (HGA ADPM)

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Euclid HGA APDM EUCLID. Mecanismo de despliegue y apunte de antena de alta ganancia (HGA ADPM) EUCLID. Mecanismo de despliegue y apunte de antena de alta ganancia (HGA ADPM) EUCLID. Mecanismo de despliegue y apunte de antena de alta ganancia (HGA ADPM) EUCLID. Mecanismo de despliegue y apunte de antena de alta ganancia (HGA ADPM)
Euclid HGA APDM
EUCLID. Mecanismo de despliegue y apunte de antena de alta ganancia (HGA ADPM)
EUCLID. Mecanismo de despliegue y apunte de antena de alta ganancia (HGA ADPM)
EUCLID. Mecanismo de despliegue y apunte de antena de alta ganancia (HGA ADPM)
EUCLID. Mecanismo de despliegue y apunte de antena de alta ganancia (HGA ADPM)
  • Client: TAS-E / TAS-I / ESA
  • Start date: 2015
  • Ending date: 2020
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SENER is developing the high gain antenna deployment and pointing mechanism (HGA ADPM) for the Euclid scientific space probe. It is a precision assembly comprised of three axes, one for antenna deployment and the other two for pointing. The assembly transmits two radio-frequency signals from the satellite to the antennae. The signals are on the K band (between 25.5 and 27 GHz) for the high gain antenna, and on the X band (between 7.1 and 8.5 GHz) for the low gain antenna. 

Main mechanism components:

  • Actuators: The number of actuators and rotation axes are the same. In this case there are three: for deployment, azimuth, and elevation. Each one of them comprises among others:
    • Stepper motor
    • Integrated bearing system
    • Gear (harmonic)
    • Positioning sensors (fine and coarse potentiometers for each Az. & El.))
    • Machined parts
    • Internal ball bearing
  • K band rotary joint: a rigid joint used to transmit the radiofrequency single despite the assembly's rotation. There is one on each actuator.
  • X band cable: used to transmit the X band signal.
  • Flexible cable: used to send the electric signals and power to the actuator, sensors, thermistors and thermal resistances.
  • L-structure: the structural element that joins the actuators.
  • Support: the structural element that joins the deployment actuator to the interface with the satellite.
  • The K band rotary joint and the actuator are specific SENER developments. 
  • Characteristics: 
  • Mass: 10.5 kg.
  • Power: 6.5 W per moving axis (steer).
  • Pointing precision: ±0.005º in open loop.
  • Speeds: 0.3º/s per axis.
  • Radio frecuency (RF):
    · Insertion Loss (K band/X band): < 1.2 dB / 1.5 dB
    · Return Loss (K band/X band): > 18 dB / > 16.5 dB
    · Radio-frequency power handling (K band/X band): min. 100 W/ min. 20 W

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ExoMars mission

The ExoMars mission (Exobiology on Mars) is a joint venture of the European Space Agency [+]

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