GPS rover station having position dithering for controlling...

Details GPS rover station having position dithering for controlling... GPS rover station having position dithering for controlling...

2007-06-05

2007-06-05

Phan, Dao L. (Department: 3662)

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

Directive

Including a satellite

C342S357490, C342S357490

Reexamination Certificate

active

11138223

ABSTRACT:
A positioning system or synthetic phase processor or rover station for providing high integrity positions with graduated accuracies. The positioning system includes one or more real time kinematic (RTK) reference stations for receiving GPS signals at established reference positions and measuring reference phases. The positioning system or the rover station selects a synthetic offset vector and uses the synthetic offset vector for inferring synthetic reference phases to a synthetic position. The rover station uses the synthetic reference phases with actual or virtual reference positions for determining a rover position having an added positional error controlled by the synthetic offset vector. For another embodiment a secure rover station dithers a secure position with a synthetic offset vector for providing an unsecure rover position having the added positional error.

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Herbert Landau, Ulrich Vollath & Xiaoming Chen, Virtual Reference Systems, Journal of Global Positioning Systems, 2002, vol. 1, No. 2, pp. 137-143.
Herbert Landau, Ulrich Vollath & Xiaoming Chen, Virtual Reference Stations versus Broadcast Solutions in RTK—Advantages and Limitations, Trimble Navigation research paper, Apr. 2003, Trimble Navigation Limited, Sunnyvale, California, pp. 1-15.
Trimble Navigation Virtual Reference Station VRS, 2001, VRS brochure, Trimble Navigation Limited, Sunnyvale, California.

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