Memorias de investigación
Communications at congresses:
GEODA: An S-Band Active Electronically Scanned Array with Hemispheric Coverage for Transmission and Reception of Multiple TT&C Signals from LEO and MEO Satellites

Research Areas
  • Engineering,
  • Telecommunications

" Satellite communications are necessary for the human lifestyle. With the dramatic increase within the next decade in the number of commercial and military satellite constellations providing world-wide telecommunication, environmental, navigation, and surveillance services, the satellites, particularly the constellations in LEO (Low Earth Orbit), MEO (Medium Earth Orbit, and GEO (Geostationary Earth Orbit) orbits, will need a network of ground stations to serve as the gateways for satellite TTC operations and/or payload message/data routing. It is obvious that current solutions based on dish antennas will not be able to cope with the requirements imposed by the missions to come; their effectiveness is limited due to their narrow beamwidth condition, high operation and maintenance cost, single point of failure elements, long down-time, only one contact at a time, slow in beam pointing and switching with reduced angular coverage among others. Consequently, a new architecture based on antenna arrays is proposed in this paper. This innovative system is based on a different technology other than large parabolic dishes and it will be known henceforth as GEODA (Geodesic Dome Array Antenna). It is a smart, conformal and multiarray antenna which offers the opportunity to receive signals from several satellites simultaneously in S band. GEODA offers the potential to reduce ground segment mission costs when a high number of satellites are to be tracked. Besides, geodesic domes have been proposed due to the following advantages: increased reliability due to suppression of mechanical parts and single points of failure; ease of manufacturing by keeping the architecture locally planar (triangular flat panels); approximately uniform beams over a hemisphere and low polarization losses and great flexibility in the multiaperture operation to perform the optimum satellite link. In the frame of SARAS Project, under an ESA GSTP A programme, the construction of six triangular panels, with patch radiation elements and the capability to simultaneously establish two links in reception and one in transmission, is being carried out. This prototype is very close to one piece of the final implementation. In the medium term it is expected a final version of the dome with 50-60 panels of approximately 0.7 meter side length, radius = 1.5 - 2 meters. G/T (Gain over Temperature) at zenith will be equivalent to that of a 2 meter diameter dish."
6th ESA International Workshop on Tracking, Telemetry and Command Systems for Space Applications
ESOC - Darmstadt, Alemania
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Libro de actas de 6th ESA International Workshop on Tracking, Telemetry and Command Systems for Space Applications

Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Grupo de Radiación
  • Departamento: Señales, Sistemas y Radiocomunicaciones