Phase Center Variation (PCV) Determination of the Ohio University Dipole ArrayUsing GPS Data

Daniel N. Aloi

Abstract:	The Local Area Augmentation System (LAAS) is being developed by the Federal Aviation Administration (FAA) to provide guidance for aircraft in the approach and landing phases of flight for accuracy levels that support category III requirements. In order to meet Category III accuracy requirements, the ground reference sites had to reduce the effects of ground based multipath. Researchers at Ohio University proposed an Integrated Multipath Limiting Antenna (IMLA), which consists of two independent antennas, to mitigate multipath. The range measurements from these two antennas are then combined in software to appear as one antenna. The dipole array, which is one of the antennas in the IMLA, has a large vertical aperture that causes its phase center to vary significantly as a function of elevation angle. This variation shows up in the basic GPS observables that are sent from the ground up to the aircraft. This paper presents a method to characterize the phase center variation (PCV) of the dipole array using GPS accumulated carrier phase (ACP) data. A field test that employed this technique is described and the results of this test are stated.
Published in:	Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999) September 14 - 17, 1999 Nashville, TN
Pages:	705 - 712
Cite this article:	Aloi, Daniel N., "Phase Center Variation (PCV) Determination of the Ohio University Dipole ArrayUsing GPS Data," Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999), Nashville, TN, September 1999, pp. 705-712.
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