Abstract
ABSTRACT: A significant portion of the reduction of multipath in the Local Area Augmentation System (LAAS) ground system is accomplished by means of an integrated multipath-limiting antenna (IMLA). Many years of analysis, design, and development have been applied to the creation of a dual-beam IMLA that provides the performance necessary to meet the demanding requirements of accuracy, availability, and integrity for the LAAS Ground Facility (LGF). Ground multipath rejection on the order of 35 to 40 dB is achieved with the IMLA throughout the entire satellite hemispherical coverage volume. Flight testing of the LAAS utilizing the IMLA at both the Federal Aviation Administration's (FAA) William J. Hughes Technical Center and Ohio University has shown that the IMLA rejects multipath to levels demonstrated to allow full compliance with the LGF specifications.
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