A METHOD FOR COMBINED USE OF A LOCAL POSITIONING SYSTEM, A LOCAL RTK SYSTEM, AND A REGIONAL, WIDE- AREA, OR GLOBAL CARRIER-PHASE POSITIONING SYSTEM

摘要

The present invention includes a method for a combined use of a local positioning system (174), a local RTK system (150) and a regional, wide-area, or global differential carrier-phase positioning system (100) (WADGPS) in which disadvantages associated with the local positioning system (174), the RTK (150) and the WADGPS (100) navigation techniques when used separately are avoided. The method includes using a known position of a user receiver (142) that has been stationary or using ah RTK system (150) to initialize the floating ambiguity values in the WADGPS system (100) when the user receiver (142) is moving. Thereafter, the refraction-corrected carrier-phase measurements obtained at the user GPS receiver (142) are adjusted by including the corresponding initial floating ambiguity values and the floating ambiguity values are treated as well known (small variance) in subsequent processes to position the user receiver (142) in the WADGPS system (100).