Patent ID: 7990307

Claim:
An integrity monitor antenna system, with enhanced multipath mitigation, usable for GPS-based aircraft precision landing system verification, comprising: an antenna configured to provide a right-hand circular polarization antenna pattern above a horizontal plane and having a phase center above said plane; a multipath limiting configuration including a bed portion positioned on said plane below said antenna and having a signal absorbent characteristic effective to provide attenuation of incident signals, said bed portion having a minimum dimension along said plane adequate to intersect ray paths from said phase center representative of multipath signals incident at negative elevation angles of minus 30 degrees or greater, and said configuration positioned at a fixed location of known latitude, longitude and altitude; a receiver/processor coupled to said antenna and configured to process received GPS signals to derive position error data representing differentials between said fixed location and a GPS-indicated location of said antenna based on signals currently received from a subset of GPS satellites, said position error data configured to be usable to derive error levels relative to aircraft location in space determinations based on GPS signals received during landing operations.