1. GPS Launches Resume; SDI Losat in Same Mission;Aviation Week and Space Technol.,1991
2. Introduction
3. Abbreviations: GPS, Global Positioning Systems; GIS, Geographic Information System; S/A, Selective Availability; GDOP, Geometric Dilution of Precision; PDOP, Position Dilution of Precision; HDOP, Horizontal Dilution of Precision; VDOP, Vertical Dilution of Precision; DLG, Digital Line Graph; TIGER, Topologically Integrated Geographic Encoding and Reference System.
4. Massatt P. , Rodus W. , and Rudnick K. 1990. 2-D and 3-D Characterization of GPS Navigation Service. NATO (AGARD) Analysis Design and Synthesis Methods for Guidance and Control Systems STAR 90-293491/GAR:114–1 – 114–15.