GPS antenna integration on the SWARM satellite

The performance of the antenna including spacecraft interference was calculated with efield® MLFMM. The spacecraft/satellite is mainly covered by large solar panels, consisting of metal films embedded in a dielectric material. Small details compared to the wavelength were removed and all parts of the antenna and the satellite were assumed to be PEC, an acceptable assumption for the frequencies considered.

CAD model oft the SWARM satellite
Figure 1: A CAD model oft the SWARM satellite. Courtesy of SAAB Space AB, Sweden.


Simulation of surface currents on the SWARM satellite
Figure 2:  Simulation of surface currents on the SWARM satellite. Courtesy of SAAB Space AB, Sweden.


Details of the efield® MLFMM simulations

  • Frequency GPS L1=1575 MHz
  • Frquency GPS L2=1227 MHz
  • Waveguide mode port excitations
  • Memory usage < 2 GB
  • MLFMM + pre-conditioner + CFIE gives fast convergence
Far field for frequency L1
Figure 3:  Far field for frequency L1 (1.6GHz). Co- and cross-polarisation for all azimuth cuts


Far field for frequency L2
Figure 4: Far field for frequency L2 (1.2GHz). Co- and cross-polarisation for all azimuth cuts