Аннотация
For aircraft precision approach operations, Earth-surface multipath
observed by an aircraft GPS antenna degrades the accuracy of pseudorange
measurement. Of particular concern are stabilized approaches over
water where the water reflection of the GPS signal could generate
sustained multipath error. A novel multipath detection method is
introduced in this work. It provides accurate estimates of multipath
strength and fading frequency using a software-defined radio GPS
receiver and radio frequency data collected from a top-mounted antenna.
Combined with analysis of flight-test data collected from both the
top-mounted antenna and a bottom-mounted antenna, the new method
allows for a realistic model of the Earth-surface multipath environment.
Narrow-band and wide-band airborne receivers are simulated, and their
responses to Earth-surface multipath are evaluated. The two receivers
are found to have different code phase error signatures in the same
multipath environment. Under different conditions, both receivers
can experience smoothed pseudorange bias of up to 0.3 m.
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