05202829 is referenced by 267 patents and cites 8 patents.

An embodiment of the present invention is a shipboard GPS positioning system having data links to outlying tailbuoys equipped with respective GPS receivers. On ship, an Intel 386-based microcomputer system collects data from various ship's equipment including the ship's GPS receiver and data from the several tailbuoy units. A computer-implemented process located in the microcomputer system controls the following processes. Periodically each GPS receiver produces updated pseudo ranges (PRs) and these are time-tagged. The time-tagged PRs for the ship are aligned according to their time tags with their counterpart PRs from the tailbuoys. The raw PRs are then passed through a Kalman mathematical filter to produce filtered pseudo-ranges (PRs). A position solution is then attempted for each GPS receiver using the PRs. The filters provide statistical data that is used to rate the quality of each PR in a weighted least squares solution process. Special measures are included to provide quality control/quality assurance, including the use of error ellipses on the display to present a graphic indication of expected solution accuracy, and the use of real time fault detection, isolation, and correction algorithms when redundant satellite information is available.

Title
Exploration system and method for high-accuracy and high-confidence level relative position and velocity determinations
Application Number
7/713438
Publication Number
5202829
Application Date
June 10, 1991
Publication Date
April 13, 1993
Inventor
George J Geier
Santa Clara
CA, US
Agent
Thomas E Schatzel
Assignee
Trimble Navigation
CA, US
IPC
G01S 5/02
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