Centimeter accurate global positioning system receiver for on-th

Details Centimeter accurate global positioning system receiver for on-th Centimeter accurate global positioning system receiver for on-th

1994-02-18

1996-05-21

Zanelli, Michael

Boots, shoes, and leggings

36442401, 348148, 342357, 342457, G01S 302, G01S 502, G06F16500

Patent

active

055196209

ABSTRACT:
A system embodiment of the present invention comprises a fixed and a roving 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-measurements of carrier phase are obtained more frequently, e.g., ten times a second, and used to propagate solutions between epochs.

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