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2. AUGMENTING GPS BY GROUND-BASED PSEUDOLITE SIGNALS FOR AIRBORNE SURVEYING APPLICATIONS
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4. 4) Barltrop, K., Stafford, J. and Elrod, B.: Local DGPS with Pseudolite Augmentation and Implementation Considerations for LAAS, 9th Int. Tech. Meeting of the Satellite Division of the U.S. Inst. of Navigation, Kansas City, Missouri, 1996, pp. 449–459.