Data processing: vehicles – navigation – and relative location – Navigation – Employing position determining equipment
Patent
1995-12-26
1998-05-12
Zanelli, Michael
Data processing: vehicles, navigation, and relative location
Navigation
Employing position determining equipment
701224, 235 95R, G01C 2100
Patent
active
057522200
ABSTRACT:
A method for substantially reducing the error that accumulates in dead reckoning systems. The method includes determining heading changes from a dead reckoning system (10), testing for improbable heading changes (20), and setting to zero any invalid heading change (40). Testing for improbable heading changes (20) in differential odometry systems includes checking the sign of both prior (60) and next pulse count differences (70) and setting an invalid heading change flag (80) if either or both differ in sign. In systems using a heading rate sensor, testing for improbable heading changes (20) includes checking whether a heading change is below a minimum turn rate (90) and, if so, setting an invalid heading change flag (100).
REFERENCES:
patent: 5058023 (1991-10-01), Kozikaro
patent: 5115238 (1992-05-01), Shimizu et al.
patent: 5156038 (1992-10-01), Kozikaro
patent: 5278424 (1994-01-01), Kagawa
Mark S. Pikula and George Calvas, "Using Variable Reluctance Sensors for Differential Odometer Applications", Vehicle Navigation & Information Systems Conference Proceedings--Part I-Dearborn, MI-Oct. 20-23, 1991 --pp. 441-450.
Botsch Sr. Bradley J.
Motorola Inc.
Zanelli Michael
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