Differential position determination using satellites

Details Differential position determination using satellites Differential position determination using satellites

1991-06-27

1992-09-15

Blum, Theordore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

364449, H04B 7185, G01S 502

Patent

active

051481790

ABSTRACT:
A method for accurately determining the position of a roving signal receiver positioned on or above the Earth's surface, relative to the position of a reference receiver whose position is known with sufficient accuracy, using ranging information, transmitted at a pair of predetermined carrier signal frequencies and received from each of n satellites (n.gtoreq.4). Pseudorange double differences are formed, between each of the two receivers and each of a first satellite and the other three satellites, using pseudorange information obtained from either one of the two signal frequencies. Phase correction information, in the form of estimates of integer lane wavelength ambiguities, is then obtained from the pseudorange double differences and from certain measurable phase differences. This products n-1 simultaneous equations that can be solved for the roving receiver position cordinates. The method can be adapted to provide roving receiver position when signals carried by both of the two carrier frequencies are encrypted, where a separate non-encrypted signal is available on one of the two carrier frequencies.

REFERENCES:
patent: 4463357 (1984-07-01), MacDoran
patent: 4754283 (1988-06-01), Fowler
patent: 4797677 (1989-01-01), MacDoran et al.
patent: 4812991 (1989-03-01), Hatch
patent: 4870422 (1989-09-01), Counselman
patent: 4912475 (1990-03-01), Counselman
Timo Allison et al, "A Geodetic Survey Receiver With Up To 12 L1 C/A Code Channels and 12 L2 Pseudo-P-Code Channels", presented at Third Internation Technical Meeting of the Satellite Division of the Institute of Navigation, Colorado Springs, Colo., Sep. 1990.

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