DISTANCE MEASURING DEVICE
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Abstract
Problems The present invention relates to a distance measuring device that measures the distance between a single signal transmitting means and a single signal receiving means with high accuracy by the signal transmitting means transmitting radio frequency signals.
Means for Solving the Problems A distance measuring device is comprised of a signal transmitting means (101), a signal receiving means (102) and a signal processing means (103). The signal transmitting means transmits radio frequency signals, the components of which are a plurality of measuring signals in synchronization with an output reference signal of a reference oscillator (7). The signal receiving means (102) generates a first local oscillating signal in synchronization with an output reference signal of a reference oscillator (34), mixes the first local oscillating signal with a received signal, converts the mixed signal to first intermediate signals with at least a plurality of different frequencies, mixes the first intermediate signals corresponding to the measuring signals with a plurality of second local oscillating signals with at least different frequencies in synchronization with or orthogonal to an output signal of a second mixer (35), and converts the mixed signal to a plurality of second intermediate signals. The signal processing means (103) detects a phase difference of the second intermediate signals and measures the distance between the signal transmitting means (101) and the signal receiving means (102) with high accuracy.
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Citations
72 Claims
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1-36. -36. (canceled)
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37. A distance measuring device in a system that performs distance measurement using an ultrasonic signal, radio frequency signal or optical signal comprising:
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a signal transmitting means that transmits an ultrasonic signal, radio frequency signal or optical signal containing a plurality of measuring signals that differ at least in frequency and are synchronized with or orthogonal to each other; a signal receiving means that receives the ultrasonic signal, radio frequency signal or optical signal transmitted from said signal transmitting means, reproduces said plurality of measuring signals, and mixes or despread the plurality of reproduced signals with a plurality of local oscillating signals that differ at least in frequency and are synchronized with or orthogonal to each other to convert the plurality of reproduced signals into intermediate frequency signals, modulation signals or baseband signals having a common frequency; and a signal processing means that processes said intermediate frequency signal, modulation signal or baseband signals output from said signal receiving means to achieve distance measurement, wherein said signal processing means detects the frequency and/or phase of a first intermediate frequency signal, modulation signal or baseband signal corresponding to a first measuring signal serving as a reference, detects the frequency and/or phase of a second intermediate frequency signal, modulation signal or baseband signal corresponding to a second measuring signal that differs from the first measuring signal serving as a reference at least in frequency, and determine the distance between said signal transmitting means and said signal receiving means based on the result of the detections. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72)
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Specification