Data processing: vehicles – navigation – and relative location – Navigation – Employing position determining equipment
Patent
1998-08-11
2000-10-03
Nguyen, Tan
Data processing: vehicles, navigation, and relative location
Navigation
Employing position determining equipment
701217, 702 92, G01C 2106
Patent
active
061285722
ABSTRACT:
A vehicle direction correcting apparatus comprises: a first filter for passing therethrough a low frequency component contained in the output voltage of a relative direction detecting unit to thereby produce a first output voltage; a second filter having delay time different from that of the first filter, for passing therethrough a low frequency component contained in the output voltage of the relative direction detecting unit to thereby produce a second output voltage; a voltage judging unit for judging as to whether or not the first output voltage of the first filter is made coincident with the second output voltage of the second filter within a predetermined error range; and a control unit for setting an output voltage of the relative direction detecting unit as the central point potential in the case that the voltage judging unit judges that the first output voltage is made coincident with the second output voltage within the predetermined error range. As a result, the vehicle direction correcting apparatus can correct the output voltage of the relative direction detecting unit based upon this central point potential in the output voltage of the relative direction detecting unit for detecting direction of the vehicle in such a manner that the drift error contained in the output voltage is eliminated.
REFERENCES:
patent: 3074699 (1963-01-01), Morris et al.
patent: 5617320 (1997-04-01), Petersen et al.
Clarion Co. Ltd.
Nguyen Tan
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