1. United States' Nationwide Differential Global Positioning System

   • Leonard W. Allen III

   FEATURE ARTICLES 01 April 1999 Pages: 1 - 6

2. Differentiation for High-Precision GPS Velocity and Acceleration Determination

   • A. M. Bruton
   • C. L. Glennie
   • K. P. Schwarz

   FEATURE ARTICLES 01 April 1999 Pages: 7 - 21

3. Assessment of the LandStar Real-Time DGPS Service under Several Operational Conditions

   • G. Fotopoulos
   • M. E. Cannon
   • G. Johnston

   FEATURE ARTICLES 01 April 1999 Pages: 22 - 34

4. Variances of GPS Phase Observations: The SIGMA-ɛ Model

   • H. Hartinger
   • F. K. Brunner

   FEATURE ARTICLES 01 April 1999 Pages: 35 - 43

5. A Regional GPS Network Solution for Monitoring Deformations of the Southeastern Eurasian Plata

   • H. Bâki Iz
   • J. Wang
   • Y. Chen

   FEATURE ARTICLES 01 April 1999 Pages: 44 - 51

6. A Modular Approach to Precise GPS Positioning

   • Kees de Jong

   FEATURE ARTICLES 01 April 1999 Pages: 52 - 56

7. GNSS Activities – Report

   • Lawrence Chesto

   DEPARTMENTS 01 April 1999 Pages: 57 - 59

8. Eye on the Ionosphere: Measuring Ionospheric Scintillation Effects from GPS Signals

   • A. J. Van Dierendonck

   DEPARTMENTS 01 April 1999 Pages: 60 - 63

9. GPS & GLONASS Current Bibliography

   • Tomás Soler

   DEPARTMENTS 01 April 1999 Pages: 64 - 66