Communication device and distance calculation system
First Claim
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1. A communication device comprising:
- a transmitter that transmits a distance-calculation signal with which to calculate a distance to a partner communication device;
a detector that receives the distance-calculation signal returned from the partner communication device and detects a phase difference between the distance-calculation signal when transmitted and the distance-calculation signal when received; and
a calculator that calculates the distance to the partner communication device based on the phase difference detected by the detector.
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Abstract
A communication device (e.g., an vehicle-mounted device) comprises a transmitter that transmits a distance-calculation signal with which to calculate a distance to a partner communication device (e.g., a mobile device), a detector that receives the distance-calculation signal returned from the partner communication device and detects a phase difference between the distance-calculation signal when transmitted and the distance-calculation signal when received, and a calculator that calculates the distance to the partner communication device based on the phase difference detected by the detector.
50 Citations
22 Claims
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1. A communication device comprising:
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a transmitter that transmits a distance-calculation signal with which to calculate a distance to a partner communication device;
a detector that receives the distance-calculation signal returned from the partner communication device and detects a phase difference between the distance-calculation signal when transmitted and the distance-calculation signal when received; and
a calculator that calculates the distance to the partner communication device based on the phase difference detected by the detector. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A communication device capable of communicating with a partner communication device which transmits a distance-calculation signal with which to calculate a distance to the communication device, receives the distance-calculation signal returned, detects a phase difference between the distance-calculation signal when transmitted and the distance-calculation signal when received, and calculates the distance to the communication device based on the phase difference, the communication device comprising
a send-back section that returns the distance-calculation signal transmitted by the partner communication device.
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13. A distance calculation system which calculates a distance between first and second communication devices, wherein the first communication device comprises:
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a transmitter that transmits a distance-calculation signal with which to calculate a distance to the second communication device;
a detector that receives the distance-calculation signal returned from the second communication device and detects a phase difference between the distance-calculation signal when transmitted and the distance-calculation signal when received; and
a calculator that calculates the distance to the second communication device based on the phase difference detected by the detector, and wherein the second communication device comprises a send-back section that returns the distance-calculation signal transmitted by the first communication device. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification