2.11.2 Pre-flight Characterisation Measurements
In order to provide the required image quality,
the two-way antenna beam pattern should be known
to a high degree of accuracy (0.1dB). The
transmit and receive antenna patterns have been
accurately measured on ground 2.11.7. for
all eight beams (IS1-IS7 and SS1) and both
horizontal and vertical polarisations. The
radiating performances of the antenna were
measured in the Large Planar Near Field Range at
Astrium Ltd (Portsmouth). Full characterisation
was performed: 8 beams, two modes (transmit
and receive), two polarisations (V and H), in
copolar and crosspolar components.
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