Data processing: vehicles – navigation – and relative location – Navigation – Employing position determining equipment
Reexamination Certificate
2006-10-17
2006-10-17
Jeanglaude, Gertrude A. (Department: 3661)
Data processing: vehicles, navigation, and relative location
Navigation
Employing position determining equipment
C701S207000, C701S213000, C701S214000, C701S217000, C342S357490
Reexamination Certificate
active
07124026
ABSTRACT:
An method and apparatus for estimating a time delay of a GPS receiver in a hybrid navigation system is disclosed. In the hybrid navigation system including the GPS receiver and a DR system, a time difference between a time, at which a velocity measured by the DR system exceeds a reference velocity, and a time, at which a velocity measured by the GPS receiver exceeds the reference velocity, is measured to calculate the time delay of the GPS receiver, so that a GPS/DR system having a loosely-coupled structure which considers the time delay can be realized. Further, in the system, when a vehicle moves from a GPS reception area to a non-reception area and a GPS/DR system mode changes into a DR system mode, an initial velocity value can be estimated while a time delay is considered for a DR system. Furthermore, since a velocity measurement apparatus for vehicles designed in accordance with the apparatus and the method has a performance superior to a velocity measurement apparatus for vehicles in the prior art, it can ultimately contribute to the position estimation accuracy of a position measurement apparatus for vehicles.
REFERENCES:
patent: 5311195 (1994-05-01), Mathis et al.
patent: 5774829 (1998-06-01), Cisneros et al.
Dilworth & Barrese LLP
Jeanglaude Gertrude A.
Samsung Electronics Co,. Ltd.
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