Because of you I am here today! An increased number of Global Navigation Satellite System (GNSS) space vehicles, broadcasting at multiple civilian frequencies, are expected to become operational over the next decade. Consequently, each user will be able to independently conduct an integrity check for their estimated position. This research explores Receiver Autonomous Integrity Monitoring (RAIM) as an alternate way to bring airplanes within 200 ft (60 m) of the ground even in poor visibility conditions, and at terrain-constrained airports. A major role played by ground equipment in traditional aviation is that of providing assistance to aircraft in maintaining the desired trajectory during both terminal and en-route phases of ight. Ground navigational aids owned by the Federal Aviation Administration (FAA) involve large costs which scale with the total number of airports and the overall air tra c capacity. These operational costs can be reduced by equipping airplanes with GNSS-enabled instrumentation. The integrit
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