Method for establishing coverage area and accuracy of a wide-area differential global positioning system

A method for establishing coverage and accuracy of user navigation position calculations using differential correction data from a wide-area differential global positioning system comprised of a plurality of space vehicles and a plurality of ground reference stations, comprising the steps of:

• converting known space vehicle position data into earth-centered, earth-fixed coordinates to form a trajectory model;
• determining which ground reference stations are capable of observing a set of known space vehicles to form a navigation accuracy model;
• projecting the space vehicle ephemeris and clock accuracy from the navigation model onto a user location in earth-centered, earth-fixed coordinates;
• iterating the wide-area differential global positioning system calculations over a specified period of time until the desired coverage area has been evaluated;
• and
• outputting and storing the calculated coverage and accuracy of user positions for a given wide-area differential global positioning system.