Centimeter accurate global positioning system receiver for on-the-fly real-time kinematic measurement and control

Patent 5602741 Issued on February 11, 1997. Estimated Expiration Date:

May 10, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventors

Assignee

Trimble Navigation Limited

Application

No. 644422 filed on 05/10/1996

US Classes:

701/213, Using Global Positioning System (GPS)342/357.03, Using differential correction342/357.04, With ambiguity resolving342/357.17, With particular action taken responsive to position342/457, Land vehicle location (e.g., bus, police car348/148, Vehicular701/1VEHICLE CONTROL, GUIDANCE, OPERATION, OR INDICATION

Examiners

Primary: Zanelli, Michael J.

Attorney, Agent or Firm

International Classes

G01S 003/02
G01S 005/02
G06F 165/00

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.

Other References

"Recent Advances in GPS Hardware & Software", Timble Navigation. Presented at National Conference on GPS Surveying; Sydney, Australia, Jun. 25-26, 1992
B. Remondi, "`On-The-Fly` Kinematic GPS Results Using Full-wavelength Dual-Frequency Carrier Ranges". No Dat