Integrity Monitoring for Precision Approach Using Kinematic GPS and a Ground-Based Pseudolite

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Abstract
Although DGPS is inherently robust to space-vehicle-related ranging errors, failures in the differential station or airborne receiver can be a threat to continuous precise positioning. The stringent required navigation performance (RNP) for Category III precision landing, therefore, establishes the need for an active integrity verification system. Carrier tracking of ground-based pseudolites can provide comprehensive integrity. The large geometry change that occurs during overflight of a ground-based pseudolite and the great precision of carrier-phase measurements can provide the leverage for effective autonomous integrity monitoring. The measurement residual statistic can be used to detect a wide range of conceivable fault scenarios occurring during the pseudolite overflight, including cycle slips, intentional tampering, and airborne database errors. The potential for autonomous integrity verification for Category III approach is demonstrated through analysis, simulation, and flight tests performed in a single-engine aircraft.

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