GPS/self-contained combination type navigation system
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United States of America Patent
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-
Feb 20, 1990
Grant Date -
N/A
app pub date -
Mar 11, 1988
filing date -
Mar 13, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a global positioning system (GPS)/self-contained combination type navigation system for a vehicle, the GPS navigation data are received by the GPS antenna of the navigation system which are simultaneously transmitted from more than 3 pieces of satellites inclusively. From the GPS navigation data, GPS type velocity data is calculated, whereas self-contained type velocity data is calculated from self-contained type navigation data such as azimuth data and drive-distance data of the vehicle. Only when a difference between the self-contained type velocity data and the GPS type velocity data exceeds a threshold velocity, the GPS type velocity data is voided so as to determine the present position of the vehicle.
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