Method and system for location-dependent time-specific correction data

A method for delivery of location-dependent time-specific corrections, said method comprising:

• storing a copy of a distribution timetable within a rover station in a first region;
• said rover station using said distribution timetable to determine a time for receiving a correction which is intended for said first region and a time interval for which said correction is configured to be usable for, wherein said time interval comprises a period greater than one second, wherein said correction comprises a virtual reference station correction plus error data descriptive of a plurality of positioning signals, wherein said error data is useable to extrapolate future corrections for greater than one second;
• and
• said rover station using said correction to determine a first corrected geographic position in said first region.

A rover station for determining a position, said rover station comprising:

• a positioning signal receiver configured to receive positioning signals from each of a plurality of positioning satellites;
• at least one wireless communication device configured to receive an extended-lifetime correction intended for a region to which said rover station is proximate via a wireless communication network, wherein said extended-lifetime correction comprises a virtual reference station correction plus error data descriptive of a plurality of positioning signals, wherein said error data is useable to extrapolate future corrections;
• and
• a processor configured to access a distribution timetable which defines a time for receiving said extended-lifetime correction which is intended for said region and further defines a time interval on which to receive successive extended-lifetime corrections intended for said region.

A system for delivery of location-dependent time-specific corrections comprising:

• a master reference station comprising:
• a distribution timetable controller input system for selectively accessing a distribution timetable and identifying a region for delivery of an extended-lifetime correction at a defined time and for delivery of successive extended-lifetime corrections for said region on a defined time interval;
• a corrections region selection system configured to identify at least one Global Navigation Satellite System (GNSS) reference station which is associated with said region;
• a corrections processor configured to access data from said at least one GNSS reference station and to generate said virtual reference station correction for said region for a first instance in time based upon positioning signals from each of a plurality of positioning satellites;
• an error generator configured to generate an instance of error data descriptive of said positioning signals for the first instance in time;
• and
• a communicative coupling with a wireless communication network;
• and
• a rover station configured to determine a first geographic position based upon the positioning signals from each of the plurality of positioning satellites and to receive said extended-lifetime correction via said wireless communication network, wherein said extended-lifetime correction comprises said virtual reference station correction and said instance of error data, wherein said error data is useable to extrapolate future corrections.