inter-satellite measurements should consider direction-dependent phase centers
Antenna phase centers can be direction-dependent. The FrequencyPattern
class manages this, thanks to both a phase center position and phase center variation functions, which can for example be read from Antex files.
The OnBoardAntenna{InterSatellites|OneWayGNSS}{Phase|Range}Modifier
modifiers should use FrequencyPattern
instead of using only fixed vectors for emitter and receiver phase centers.