CENTIMETER ACCURATE GLOBAL POSITIONING SYSTEM RECEIVER FOR ON-THE-FLY REAL-TIME KINEMATIC MEASUREMENT AND CONTROL

摘要

A system embodiment of the present invention comprises a fixed (12) and a roving (14) pair of four-observable GPS receivers and a communication link between them for double differencing code and carrier measurements. Carrier phase integer ambiguities are resolved efficiently by searching the simultaneous narrow-lane intersections of both the L1 and L2 wave fronts propagated by the GPS satellites being tracked. External constraint information, such as elevation, is additionally used to speed up integer ambiguity resolution. Data between the reference station and the rover is communicated in compressed form at a regular interval, e.g., once a second at each epoch, and demi-measurement of carrier phase are obtained more frequently, e.g., ten times a second, and used to propagate solutions between epochs.