Method and apparatus for calculating a figure of merit for...

Details Method and apparatus for calculating a figure of merit for... Method and apparatus for calculating a figure of merit for...

2007-02-27

2007-02-27

Zanelli, Michael J. (Department: 3661)

Data processing: vehicles, navigation, and relative location

Navigation

Employing position determining equipment

C342S357490

Reexamination Certificate

active

10498330

ABSTRACT:
This invention relates to a method and apparatus for qualifying and quantifying the quality of navigational data emanating from any GPS receiver using its NMEA 0183 output messages for use in a dead reckoning system. It does this by deriving a first distance measurement travelled for a predetermined time period from a dead reckoning system or a GPS system. It then also calculates a second distance being the distance between two global positioning system (GPS) position measurements in the predetermined time. Finally, it calculates the difference between the first and second distances to derive a distance error. The statistical variance of the distance errors derived by repeating the above steps a predetermined number of times is representative of a figure of merit of a prior GPS position of the vehicle.

REFERENCES:
patent: 5416712 (1995-05-01), Geier et al.
patent: 5862511 (1999-01-01), Croyle et al.
patent: 6061632 (2000-05-01), Dreier
patent: 6388613 (2002-05-01), Nagatsuma et al.
patent: 0 629 877 (1994-12-01), None
patent: WO 02/04974 (2002-01-01), None
Wood, C, etal, GPSiDead Reckoning — Vehicle Positioning in the Urban Environment — White Paper: Product Overview , A Neve Technologies White Paper, Feb. 2001, pp. 1-16.

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