Method for detecting road position of car in multiformation road
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United States of America Patent
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May 7, 2002
Grant Date -
N/A
app pub date -
Sep 8, 2000
filing date -
Jan 13, 1999
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Abstract
The present invention provides a method for identifying a position of a vehicle on a multi-layer road, by which it is possible to judge whether the vehicle is running on an upper layer or a lower layer of the multilayer road without using additional new devices or parts on a navigation system. In order to identify a position of a vehicle on a road when the vehicle is running on a multi-layer road, prediction can be made to some extent by determining the visible range to see GPS satellite in the sky is wide or narrow. With the purpose of processing the problem quantitatively, a position measuring ratio is defined as follows: Position measuring ratio (%)=(Traveled distance where GPS position measuring is effective).times.100/(Traveled distance). By this position measuring ratio, it is possible to identify the position of the vehicle on the road.
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