Abstract
Multipath is potentially the largest contributor to positioning error for differential GPS. Airborne receivers will be subject to multipath from the airframe and from the ground and other objects during precision approach. Extensive flight testing of GPS receiver systems on the new Boeing 777 has been performed. One of the characteristics of this new aircraft is its large wingspan, which may cause significant GPS multipath positioning errors. Experiments were carried out to quantify these effects under various flight regimes. The 777 flight test experimental set-up involved both narrow- and standard-correlator receivers. The data were analyzed with particular attention to assessing the multipath effects during precision approach. Flight testing of GPS receivers on the 747-400 and 737 has also been performed, and the data analyzed to assess the level of airframe multipath. This paper compares the apparent airframe multipath effects for the two commercial transport airframes-the 747-400 and the 777.
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