Method of calculating movement speed and device for calculating movement speed
AssigneeSeiko Epson Corporation
InventorsTsubasa SHIRAI, Yoshitaka YAMAGATA
Life of this patent
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Abstract
In a baseband processing circuit unit, a reception signal type determination unit determines whether or not a reception signal in a GPS reception unit is an indirect wave. A movement speed calculation unit calculates a movement speed of the GPS reception unit using a correction coefficient of a relative speed determined in accordance with the determination of whether or not the reception signal is an indirect wave, a transmission frequency of a GPS satellite signal and a reception frequency in the GPS reception unit.
Claims7
A method for calculating a movement speed of a receiver receiving a transmission signal from a predetermined transmission source, the method comprising:
- determining whether or not a reception signal of the receiver is an indirect wave;
- and
- based on a principle that a reception frequency changes depending on a relative speed of the transmission source and the receiver, calculating the movement speed of the receiver using a correction coefficient of the relative speed determined in accordance with the determination of whether or not the reception signal is an indirect wave, a transmission frequency of the transmission signal and the reception frequency in the receiver.
A device for calculating a movement speed, the device comprising:
- a reception unit which receives a transmission signal from a predetermined transmission source;
- a determination unit which determines whether or not a reception signal of the reception unit is an indirect wave;
- and
- a calculation unit which, based on a principle that a reception frequency changes depending on a relative speed of the transmission source and the reception unit, calculates the movement speed of the reception unit using a correction coefficient of the relative speed determined in accordance with the determination of whether or not the reception signal is an indirect wave, a transmission frequency of the transmission signal and the reception frequency in the reception unit.
Dependencies are inferred from the claim text.