TY - RPRT TI - Validating the airborne and ground based components of a differential GPS system AU - Edwards, F. G. AU - Hegarty, D. M. AU - Turner, R. N. AU - Van Graas, F. AU - Sharma, S. PY - 1988 UR - https://ntrs.nasa.gov/citations/19880064479 ID - 19880064479 ER -