To enable precision approach and landing navigation, a carrier-phase DGPS/INS hybrid navigation system was developed characterized by the primary use of a GPS carrier-phase rather than a GPS pseudorange. Half the advantages of this system are derived from installing a reliable INS able to provide 6-degrees of freedom navigation data with a wide dynamic range, and maintain high availability and continuity. The other advantages of the system come from the use of DGPS/INS hybrid navigation to improve navigation accuracy. In this DGPS/INS hybrid navigation algorithm, the authors used the Kalman filter, which estimates the carrier-phase ambiguity as well as INS drift errors. This system can then utilize the GPS carrier-phase, although the majority of conventional DGPS/INS systems are based on the GPS speudorange. Because the GPS carrier-phase is tolerant to multipath errors, sub-meter positioning performance is achieved, while conventional DGPS/INS systems achieve accuracy over several meters.
Technical Report of National Aerospace Laboratory. Development of Carrier-Phase and DGPS/INS Hybrid Navigation Algorithm
2000
42 pages
Report
No indication
English
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