POSITIONING DEVICE AND METHOD TO DETERMINE A POSITION USING AN ABSOLUTE POSITIONING SYSTEM AND A RELATIVE POSITIONING SYSTEM, COMPUTER PROGRAM AND A DATA CARRIER
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United States of America Patent
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Issued Date -
Jun 3, 2010
app pub date -
May 24, 2007
filing date -
May 24, 2007
priority date (Note) -
Abandoned
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Abstract
A positioning device is arranged to determine a position using an absolute positioning system and a relative positioning system. The positioning device is arranged, in at least one embodiment, to work in a first mode, in which the position is determined using the absolute positioning system and possibly the relative positioning system, and in a second mode, in which the position is determined using the relative positioning system and possibly the absolute positioning system. In the first mode the absolute positioning system is weighted more heavily than in the second mode and the positioning device is arranged to switch from the first to the second mode. The positioning device has access to a digital map database in at least one embodiment and the switch from the first to the second mode is decided based on at least the determined position in combination with information stored in the digital map database.
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