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US 5,668,776 AGranted
Velocity measurement apparatus of moving object
AssigneeHitachi, Ltd.
InventorKageyoshi Katakura
Life of this patent
Estimating the term…
Abstract
A velocity measurement apparatus is disclosed which is composed of a transmitter having a plurality of elements for transmitting a signal wave, a receiver having a plurality of elements for receiving a reflected signal from a target object, and a Fourier transformation processor for two-dimensionally Fourier transforming a two-dimensional received signal in an array direction and a time axial direction of the plurality of elements of the receiver. The two-dimensional received signal is derived by repeating the transmission and reception operations a plurality of times. The velocity measurement apparatus measures a moving velocity of the target object directing to the means for receiving.
Claims19
A velocity measurement apparatus comprising:
- a transducer for transmitting a signal wave to a target object repeatedly a plurality of times at a predetermined time interval and for receiving a reflected signal from said target object repeatedly a plurality of times, said transducer having a plurality of elements arrayed in a direction;
- and
- a velocity calculating unit to calculate a moving velocity in a radial direction for said target object approaching said transducer and being in a fixed direction relative to said transducer, said velocity calculating unit comprising Fourier transforming means for two-dimensionally Fourier transforming a two-dimensional received signal at a specific time of the reflected signal by said transducer in an array direction of said plurality of elements and in a time axis direction defined by the transmitting time of the signal wave to said target object repeatedly a plurality of times.
A velocity measurement apparatus comprising:
- a transducer for transmitting a signal wave to a target object repeatedly a plurality of times at a predetermined time interval and for receiving a reflected signal from said target object repeatedly a plurality of times, said transducer having a plurality of elements arrayed in a direction;
- and
- a velocity calculating unit to calculate a moving velocity in a radial direction for said target object approaching said transducer and being in a fixed direction relative to said transducer, said velocity calculating unit comprising first Fourier transforming means for one-dimensional Fourier transforming a two-dimensional received signal at a specific time of the reflected signal by said transducer in an array direction of said plurality of elements, and second Fourier transforming means for one-dimensional Fourier transforming a signal obtained by said first Fourier transforming means in a time axis direction defined by the transmitting time of the signal wave to said target object repeatedly a plurality of times.
A velocity measurement apparatus comprising:
- a transducer for transmitting a signal wave to a target object repeatedly a plurality of times at a predetermined time interval and for receiving a reflected signal from said target object repeatedly a plurality of times, said transducer having a plurality of elements arrayed in a direction;
- and
- a velocity calculating unit to calculate a moving velocity in a radial direction for said target object approaching said transducer and being in a fixed direction relative to said transducer, said velocity calculating unit comprising first Fourier transforming means for one-dimensional Fourier transforming a two-dimensional received signal at a specific time of the reflected signal by said transducer in a time axis direction defined by the transmitting time of the signal wave to said target object repeatedly a plurality of times, and second Fourier transforming means for one-dimensional Fourier transforming a signal obtained by said first Fourier transforming means in an array direction of said plurality of elements.
A velocity measurement apparatus comprising:
- a transducer for transmitting a signal wave to a target object repeatedly a plurality of times at a predetermined time interval and for receiving a reflected signal from said target object repeatedly a plurality of times, said transducer having a plurality of elements arrayed in a direction;
- and
- a velocity calculating unit to calculate a moving velocity in a radial direction for said target object approaching said transducer and being in a fixed direction relative to said transducer, said velocity calculating unit comprising projecting means for projecting a two-dimensional received signal at a specific time of the reflected signal by said transducer, and Fourier transforming means for one-dimensional Fourier transforming a projected signal obtained by said projecting means.
A velocity measurement apparatus comprising:
- a transducer for transmitting a signal wave to a target object repeatedly a plurality of times at a predetermined time interval and for receiving a reflected signal from said target object repeatedly a plurality of times, said transducer having a plurality of elements arrayed in a direction;
- and
- a velocity calculating unit to calculate a moving velocity in a radial direction for said target object approaching said transducer and being in a fixed direction relative to said transducer, said velocity calculating unit comprising converting means for converting received signals by said transducer elements to a received signal component incident to said transducer from each direction, and Fourier transforming means for one-dimensional Fourier transforming a signal obtained by said converting means in a time axis direction defined by the transmitting time of the signal wave to said target object repeatedly a plurality of times.
A velocity measurement apparatus comprising:
- a transducer for transmitting a signal wave to a target object repeatedly a plurality of times at a predetermined time interval and for receiving a reflected signal from said target object repeatedly a plurality of times, said transducer having a plurality of elements array in a direction;
- and
- a velocity calculating unit to calculate a moving velocity in a radial direction for said target object approaching said transducer and being in a fixed direction relative to said transducer, said velocity calculating unit comprising converting means for converting received signals by said transducer elements to a received signal component incident to said transducer from each direction, and analysis means for performing frequency analysis on a signal obtained by said converting means.
A velocity measurement apparatus comprising:
- a transducer for transmitting a signal wave to a target object repeatedly a plurality of times at a predetermined time interval and for receiving a reflected signal from said target object repeatedly a plurality of times, said transducer having a plurality of elements arrayed in a direction;
- and
- a velocity calculating unit to calculate a moving velocity in a radial direction for said target object approaching said transducer and being in a fixed direction relative to said transducer, said velocity calculating unit comprising analysis means for performing frequency analysis on a two-dimensional received signal at a specific time of the reflected signal by said transducer, and Fourier transforming means for one-dimensional Fourier transforming a signal obtained by said analysis means in an array direction of said plurality of elements.
A velocity measurement method comprising the steps of:
- (1) transmitting a signal wave to a target object repeatedly a plurality of times at a predetermined time interval from a transducer having a plurality of elements arrayed in a direction, and receiving a reflected signal from said target object repeatedly a plurality of times by said transducer;
- and
- (2) calculating a moving velocity in a radial direction for said target object approaching said transducer and being in a fixed direction relative to said transducer, said moving velocity calculated from two-dimensionally Fourier transforming a two-dimensional received signal at a specific time of the reflected signal by said transducer in an array direction of said plurality of elements and in a time axis direction defined by the transmitting time of the signal wave to said target object repeatedly a plurality of times.
A velocity measurement method comprising the steps of:
- (1) transmitting a signal wave to a target object repeatedly a plurality of times at a predetermined time interval from a transducer having a plurality of elements arrayed in a direction, and receiving a reflected signal from said target object repeatedly a plurality of times by said transducer;
- and
- (2) calculating a moving velocity in a radial direction for said target object approaching said transducer and being in a fixed direction relative to said transducer, said calculating the moving velocity comprising the substeps of:
- (i) first one-dimensional Fourier transforming a two-dimensional received signal at a specific time of the reflected signal by said transducer in an array direction of said plurality of elements;
- and
- (ii) second one-dimensional Fourier transforming a signal obtained in the substep (i) in a time axis direction defined by the transmitting time of the signal wave to said target object repeatedly a plurality of times.
3 more elements
A velocity measurement method comprising the steps of:
- (1) transmitting a signal wave to a target object repeatedly a plurality of times at a predetermined time interval from a transducer having a plurality of elements arrayed in a direction, and receiving a reflected signal from said target object repeatedly a plurality of times by said transducer;
- and
- (2) calculating a moving velocity in a radial direction for said target object approaching said transducer and being in a fixed direction relative to said transducer, said calculating the moving velocity comprising the substeps of:
- (i) one-dimensional Fourier transforming a two-dimensional received signal at a specific time of the reflected signal by said transducer in a time axis direction defined by the transmitting time of the signal wave to said target object repeatedly a plurality of times;
- and
- (ii) one-dimensional Fourier transforming a signal obtained in the substep (i) in an array direction of said plurality of elements.
3 more elements
A velocity measurement method comprising the steps of:
- (1) transmitting a signal wave to a target object repeatedly a plurality of times at a predetermined time interval from a transducer having a plurality of elements arrayed in a direction, and receiving a reflected signal from said target object repeatedly a plurality of times by said transducer;
- and
- (2) calculating a moving velocity in a radial direction for said target object approaching said transducer and being in a fixed direction relative to said transducer, said calculating the moving velocity comprising the substeps of:
- (i) projecting a two-dimensional received signal at a specific time of the reflected signal by said transducer;
- and
- (ii) one-dimensional Fourier transforming a projected signal obtained in the substep (i).
3 more elements
A velocity measurement method comprising the steps of:
- (1) transmitting a signal wave to a target object repeatedly a plurality of times at a predetermined time interval from a transducer having a plurality of elements arrayed in a direction, and receiving a reflected signal from said target object repeatedly a plurality of times by said transducer;
- and
- (2) calculating a moving velocity in a radial direction for said target object approaching said transducer and being in a fixed direction relative to said transducer, said calculating the moving velocity comprising the substeps of:
- (i) converting received signals by said transducer elements to a received signal component incident to said transducer from each direction;
- and
- (ii) one-dimensional Fourier transforming a signal obtained in the substep (i) in a time axis direction defined by the transmitting time of the signal wave to said target object repeatedly a plurality of times.
3 more elements
A velocity measurement method comprising the steps of:
- (1) transmitting a signal wave to a target object repeatedly a plurality of times at a predetermined time interval from a transducer having a plurality of elements arrayed in a direction, and receiving a reflected signal from said target object repeatedly a plurality of times by said transducer;
- and
- (2) calculating a moving velocity in a radial direction for said target object approaching said transducer and being in a fixed direction relative to said transducer, said calculating the moving velocity comprising the substeps of:
- (i) converting received signals by said transducer elements to a received signal component incident to said transducer from each direction;
- and
- (ii) performing frequency analysis on a signal obtained in the substep (i).
3 more elements
A velocity measurement method comprising the steps of:
- (1) transmitting a signal wave to a target object repeatedly a plurality of times at a predetermined time interval from a transducer having a plurality of elements arrayed in a direction, and receiving a reflected signal from said target object repeatedly a plurality of times by said transducer;
- and
- (2) calculating a moving velocity in a radial direction for said target object approaching said transducer and being in a fixed direction relative to said transducer, said calculating the moving velocity comprising the substeps of:
- (i) performing frequency analysis on a two-dimensional received signal at a specific time of the reflected signal by said transducer;
- and
- (ii) one-dimensional Fourier transforming a signal obtained in the substep (i) in an array direction of said plurality of elements.
3 more elements
Dependencies are inferred from the claim text.