Constellator™ proven best and only for Geostationary orbit!

Constellator™: Space proven with a tough case in GEO

Our customer successfully launched a geostationary satellite following a highly elliptic Transfer Orbit, using the multi-trajectory and hardware-in-the-loop capabilities of our Constellator GNSS simulator.

He could measure good performances of the RF signals generated by Constellator and noted a good tracking at the spaceborne GNSS receiver side. 

These performances were achieved even during the high elliptical transfer orbit up to geostationary one.



Constellator™  transmitted RF signals to the Spaceborne GNSS Receiver with the expected quality levels, from launch and early orbit phases up to the geostationary station through a rather elliptical transfer orbit.

Thanks to Constellator™, the spaceborne GNSS receiver worked perfectly: our customer recognized Constellator as the most efficient equipment on the market and highlighted its RF quality even in high dynamics conditions :



Constellator™ has therefore been proved to be the only reliable solution for GEO on the market as the satellite accurately reached its geostationary trajectory as simulated by hardware-in-the-loop tests.




 Simulation you can trust, even in GEO, how does it work:


 GNSS simulation for launching a satellite into geostationary orbit has always been a challenge and is an extreme use case for GNSS test equipment.


 Several aspects of geostationary trajectories make it one of the most difficult use case:

  •  Very few numbers of GNSS satellites are in view of the antenna(s) of a spaceborne GNSS Receiver in geostationary orbit
  • The antennas of the GPS satellites emit to the Earth and not to the GNSS receiver which is in a Geostationary orbit (i.e. above) 
  • The effects of the ionosphere’s shrinking cross (« double-crossing »)
  • Sun/Moon effects which are the main destabilizing effect of geostationary orbits

On the simulator side, it challenges the RF power dynamics management on top of both the equipment performance and the quality of the simulation models. This is critical for such an highly elliptical orbit.




 Constellator™ has been designed from the ground up to meet those extreme requirements:

  • With up to 660 software channels to handle multi-frequency, multi-constellation 


  •  Models including:

– handling double ionosphere crossing, 

– side lobes simulation

– based on JGM3 Earth gravity model up to the 40th order

– atmospheric drag with custom ballistic coefficient

 – Sun/Moon 3rd body effect

Constellator - GNSS Simulator