Method and apparatus for measuring distance in a wireless environment
First Claim
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1. A method for measuring a distance in a wireless environment, comprising:
- transmitting a distance measurement signal to a second device and receiving at least one response signal for the transmitted distance measurement signal from the second device by a first device;
matching a received response signal waveform with a reference signal waveform to detect a peak value of an earliest response signal waveform by the first device;
detecting the peak value of the earliest response signal waveform using a result of the matching by the first device; and
calculating a time taken from the transmission of the distance measurement signal to the second device and the reception of the response signal from the second device using a peak value of the earliest response signal by the first device,wherein a pulse width of the reference signal is computed by;
reference pulse width=α
×
single pulse widthwhere α
denotes a value proportional to Received Signal Strength Indication (RSSI), and single pulse width is defined as a pulse width measured at a reference RSSI, andwherein the peak value of the reference signal is detected according to the pulse width of the reference signal.
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Abstract
A method and apparatus for measuring a distance in a wireless environment are provided, in which a first device transmits a distance measurement signal to a second device and receives at least one response signal for the distance measurement signal from the second device, matches the received response signal with a reference signal to detect an earliest response signal, and calculates a time taken from the transmission of the distance measurement signal to the second device and the reception of the response signal from the second device using a peak value of the matched reference signal.
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Citations
7 Claims
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1. A method for measuring a distance in a wireless environment, comprising:
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transmitting a distance measurement signal to a second device and receiving at least one response signal for the transmitted distance measurement signal from the second device by a first device; matching a received response signal waveform with a reference signal waveform to detect a peak value of an earliest response signal waveform by the first device; detecting the peak value of the earliest response signal waveform using a result of the matching by the first device; and calculating a time taken from the transmission of the distance measurement signal to the second device and the reception of the response signal from the second device using a peak value of the earliest response signal by the first device, wherein a pulse width of the reference signal is computed by;
reference pulse width=α
×
single pulse widthwhere α
denotes a value proportional to Received Signal Strength Indication (RSSI), and single pulse width is defined as a pulse width measured at a reference RSSI, andwherein the peak value of the reference signal is detected according to the pulse width of the reference signal. - View Dependent Claims (2, 3, 4)
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5. An apparatus for measuring a distance in a wireless environment, comprising:
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a transceiver for transmitting a distance measurement signal to a device to which a distance is to be measured and receiving a response signal for the transmitted distance measurement signal from the device; a signal detector for matching a received response signal waveform with a reference signal waveform to detect a peak value of an earliest response signal waveform by the first device, and detecting the peak value of the earliest response signal waveform from the received response signal using a result of the matching; and a distance calculator for measuring the distance using the peak value of the earliest response signal, wherein a pulse width of the reference signal is computed by;
reference pulse width=α
×
single pulse widthwhere α
denotes a value proportional to Received Signal Strength Indication (RSSI), and single pulse width is defined as a pulse width measured at a reference RSSI, andwherein the peak value of the reference signal is detected according to the pulse width of the reference signal. - View Dependent Claims (6, 7)
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Specification