| FLIGHT TEST OF A GPS/INS/PSEUDOLITE INTEGRATED SYSTEM FOR AIRBORNE MAPPING (2008) | |||||||||||||||||
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| Carrier phase based DGPS systems have been used for airborne mapping for many years. Integrated GPS/INS systems are also becoming popular in order to improve the positioning accuracy, system reliability and achieve direct geo-referencing. However, this approach is limited by the current GPS constellation. Further improvement is required to achieve centimetre level positioning accuracy, which becomes increasingly important for large scale airborne mapping. Previous researches have shown that ground-based pseudolites can strengthen the constellation of GPS satellites and their geometric distribution, and improve the measurement geometry. GPS/INS systems augmented by pseudolites demonstrate improved positioning reliability and accuracy, especially in the vertical component. This paper describes a flight test of a tightly integrated airborne GPS/INS system augmented by pseudolites. In this system, GPS and pseudolite measurements are collected from two airborne antennas mounted up-facing and down-facing respectively. Different troposphere and ionosphere delay models are applied to GPS and pseudolite | |||||||||||||||||
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