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FIGURE 10 Correlation coefficients of the ionospheric delay vs. IPP separation distance using daytime data (preliminary result). The day time data shows strong correlation up to 2000 ∼ 3000 km. 
FIGURE 11 Correlation coefficients of the ionospheric delay vs. IPP separation distance using nighttime data (preliminary result). The night time data shows much stronger correlation than the day time.
REFERENCES
Barrows, A., P.Enge, B.Parkinson, J.Powell, Flight Tests of a 3-D Perspective-View Glass-Cockpit Display for General Aviation Using GPS , Proceedings of ION-GPS-95, Palm Springs, CA, September, 1995, pp 1615-1622. Cohen, C., D.Lawrence, H.S. Cobb, B. Pervan, J.D.Powell, B. Parkinson, G.Aubrey, W. Loewe, D.Ormiston, B.D. McNally, D.Kaufmann, V.Wullschleger, and R Swider, “Preliminary Results of Category III Precision Landing With 110 Automatic Landings of United Boeing 737 Using GNSS Integrity Beacons,” Proceedings of the National Technical Meeting of the Institute of Navigation, Anaheim, pp. 157-166, January, 1995. Hatch, R.R., The Synergism of GPS Code and Carrier Measurements, Proceedings of the Third Geodetic Symposium on Satellite Doppler Positioning, Las Crues, NM, Feb, 1982, pp1213-1232. ICD-GPS-200 Revision B-PR, Rockwell International, July 1991. Kee C., B. Parkinson, P. Axlerad, Wide Area Differential GPS Navigation, Journal of the US Institute of Navigation, vol.38, no.2, Summer, 1991. Klobuchar, J.A Design and Characteristics of the GPS ionospheric Time Delay Algorithm for Single Frequency Users IEEE Position Location and Navigation Symposium, Las Vegas, NV, Nov. 1986. Knecht, D.J. Shuman, B.M. Handbook of Geophysics and the Space Environment, chapter of the geomagnetic field., 1985. Lawrence, D., J. Evans, Y.C. Chao, Y.J.Tsai, C.Cohen, T.Walter, P.Enge, J.D.Powell, B.Parkinson, Integration of Wide Area DGPS with Local Area Kinematic DGPS, IEEE PLANS 96, Atlantic City, GA, April, 1996. RTCA Special Committee 159 Working Group 2 Wide Area Augmentation System Signal Specification, March 1994. RTCA Special Committee 159, Minimum Operational Performance Standards (MOPS) for Airborne Supplemental Navigation Equipment Using GPS, RTCA 204-91/SC159-29, These MOPS are modified by Technical Standard Order TSO-C129, which was released December 10, 1992. Tsai, Y.J., P.Enge, Y.C. Chao, T. Walter, C.Kee, J.Evans, A.Barrows, D.Powell, B.Parkinson, Validation of the RTCA Message Format for WAAS, ION-GPS-95. Walter T., C. Kee, Y.C. Chao, Y.J. Tsai, U. Peled, J.Ceva, A. Barrows, E. Abbott, D. Powell, P. Enge and B. Parkinson Flight Trials of the Wide Area Augmentation System (WAAS), Proceeding of Institute of Navigation 1994 Annual Meeting of the Satellite Division (ION-GPS-94), Salt Lake City, Salt Lake City, Sept, 1994.
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