Patent ID: 7119757

Claim:
A dual-array GPS antenna system, usable to provide horizon to zenith reception for differential GPS applications, comprising: a vertically-extending structure; a lower array of sub-arrays supported by said structure at vertically spaced positions and each configured to provide a progressive-phase-omnidirectional (PPO) azimuth pattern; a first excitation network coupled to sub-arrays of said lower array and arranged to provide an elevation pattern with elevation angle coverage nominally from horizon up to at least a predetermined elevation angle; an upper array of three sub-arrays supported by said structure at vertically spaced positions above said sub-arrays of the lower array and each configured to provide a PPO azimuth pattern; a second excitation network coupled to the sub-arrays of said upper array and arranged to provide an elevation pattern with elevation angle coverage nominally from zenith down to at least said predetermined elevation angle; each said sub-array of the lower and upper arrays comprising four dipoles positioned with different azimuth orientations and configured to receive signals of nominally circular polarization; a first signal port coupled to said first excitation network; and a second signal port coupled to said second excitation network.