A pair of patch antennas are used to form a null slit antenna pattern for receiving GPS signals from at least three GPS satellites functioning as pseudo stars for spin rate and spin axis attitude determination for a spinning space vehicle in an earth orbit below the GPS satellites.
Keywords: GPS, antenna
International Class: B64G1/24, B64G1/36, B64G1/66, G01S1/00, G01S5/02, H01Q1/22, H01Q1/28, H01Q9/04, H01Q21/28, H01Q25/02, G01S19/53, G01S5/14