RADAR DEVICE AND PROCESSING METHOD THEREFOR
First Claim
1. A radar device comprising:
- a transmission means for generating a transmission signal whose frequency periodically increases and decreases in a constant modulation width, and for radiating the transmission signal into space;
a reception means for acquiring a reception signal by receiving a reflected signal of the transmission signal by a target, and for generating a beat signal by mixing the reception signal with the transmission signal;
a beat-frequency generating means for obtaining a first beat-frequency distribution from the beat signal at the time of up-chirping in which the frequency of the transmission signal ascends so as to determine a frequency peak in the first beat-frequency distribution, and for obtaining a second beat-frequency distribution from the beat signal at the time of down-chirping in which the frequency of the transmission signal descends so as to determine a frequency peak in the second beat-frequency distribution;
an up-chirp beat-frequency tracking means for performing tracking processing on a frequency peak in the first beat-frequency distribution over a span of a plurality of up-chirping time-intervals, and for generating first beat-frequency time-series data from the frequency peak whose correlation is obtained by the tracking processing;
an up-chirp target-detection means for calculating a first range and range-change rate to the target from the first beat-frequency time-series data;
a down-chirp beat-frequency tracking means for performing tracking processing on a frequency peak in the second beat-frequency distribution over a span of a plurality of down-chirping time-intervals, and for generating second beat-frequency time-series data from the frequency peak whose correlation is obtained by the tracking processing; and
a down-chirp target-detection means for calculating a second range and range-change rate to the target from the second beat-frequency time-series data.
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Accused Products
Abstract
According to a conventional method of correlating beat frequencies in a radar device, a detecting state of a target differs at the time of up-chirping and at that of down-chirping, so that, when the number of peaks of beat frequencies does not match with each other, there occurs a situation in which the beat frequencies cannot be accurately correlated.
The radar device herein provided includes a transmission unit for transmitting a frequency-modulated continuous wave (FMCW) signal; a reception unit for generating a beat signal from the transmission signal and a reception signal corresponding thereto; a beat-frequency generating unit for obtaining a beat-frequency distribution corresponding to the beat signal; an up-chirp beat-frequency tracking means and a down-chirp beat-frequency tracking means for performing tracking processing on a beat signal; and an up-chirp target-detection means and a down-chirp target-detection means for calculating a range and range-change rate to a target based on a beat signal'"'"'s frequency distribution.
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Citations
26 Claims
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1. A radar device comprising:
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a transmission means for generating a transmission signal whose frequency periodically increases and decreases in a constant modulation width, and for radiating the transmission signal into space; a reception means for acquiring a reception signal by receiving a reflected signal of the transmission signal by a target, and for generating a beat signal by mixing the reception signal with the transmission signal; a beat-frequency generating means for obtaining a first beat-frequency distribution from the beat signal at the time of up-chirping in which the frequency of the transmission signal ascends so as to determine a frequency peak in the first beat-frequency distribution, and for obtaining a second beat-frequency distribution from the beat signal at the time of down-chirping in which the frequency of the transmission signal descends so as to determine a frequency peak in the second beat-frequency distribution; an up-chirp beat-frequency tracking means for performing tracking processing on a frequency peak in the first beat-frequency distribution over a span of a plurality of up-chirping time-intervals, and for generating first beat-frequency time-series data from the frequency peak whose correlation is obtained by the tracking processing; an up-chirp target-detection means for calculating a first range and range-change rate to the target from the first beat-frequency time-series data; a down-chirp beat-frequency tracking means for performing tracking processing on a frequency peak in the second beat-frequency distribution over a span of a plurality of down-chirping time-intervals, and for generating second beat-frequency time-series data from the frequency peak whose correlation is obtained by the tracking processing; and a down-chirp target-detection means for calculating a second range and range-change rate to the target from the second beat-frequency time-series data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 12)
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9. A radar device comprising:
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a transmission means for generating a transmission signal whose frequency periodically increases and decreases in a constant modulation width, and for radiating the transmission signal into space; a reception means for acquiring a reception signal by receiving a reflected signal of the transmission signal by a target, and for generating a beat signal by mixing the reception signal with the transmission signal; a beat-frequency generating means for obtaining a first beat-frequency distribution from the beat signal at the time of up-chirping in which the frequency of the transmission signal ascends so as to determine a frequency peak in the first beat-frequency distribution, and for obtaining a second beat-frequency distribution from the beat signal at the time of down-chirping in which the frequency of the transmission signal descends so as to determine a frequency peak in the second beat-frequency distribution; an up-chirp beat-frequency tracking means for performing tracking processing on a frequency peak in the first beat-frequency distribution over a span of a plurality of up-chirping time-intervals, and for generating first beat-frequency time-series data from the frequency peak whose correlation is obtained by the tracking processing; an up-chirp target-detection means for calculating a first state vector of the target from the first beat-frequency time-series data; a down-chirp beat-frequency tracking means for performing tracking processing on a frequency peak in the second beat-frequency distribution over a span of a plurality of down-chirping time-intervals, and for generating second beat-frequency time-series data from the frequency peak whose correlation is obtained by the tracking processing; and a down-chirp target-detection means for calculating a second state vector of the target from the second beat-frequency time-series data. - View Dependent Claims (10, 11)
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13. A radar device comprising:
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a transmission means for generating a transmission signal whose frequency periodically increases and decreases in a constant modulation width, and for radiating the transmission signal into space; a reception means for acquiring a reception signal by receiving a reflected signal of the transmission signal by a target, and for generating a beat signal by mixing the reception signal with the transmission signal; a beat-frequency generating means for obtaining a beat-frequency distribution from the beat signal at either the time of up-chirping in which the frequency of the transmission signal ascends or the time of down-chirping in which the frequency of the transmission signal descends so as to determine a frequency peak in the beat-frequency distribution; a beat-frequency tracking means for performing tracking processing on a frequency peak in the beat-frequency distribution over either a span of a plurality of up-chirping time-intervals or a span of a plurality of down-chirping time-intervals, and for generating beat-frequency time-series data from the frequency peak whose correlation is obtained by the tracking processing; and a target-detection means for calculating a range and range-change rate to the target from the beat-frequency time-series data.
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14. A radar processing method, comprising.
a transmission step of generating a transmission signal whose frequency periodically increases and decreases in a constant modulation width, and of radiating the transmission signal into space; -
a reception step of acquiring a reception signal by receiving a reflected signal of the transmission signal by a target, and of generating a beat signal by mixing the reception signal with the transmission signal; a beat-frequency generation step of obtaining a first beat-frequency distribution from the beat signal at the time of up-chirping in which the frequency of the transmission signal ascends so as to determine a frequency peak in the first beat-frequency distribution, and of obtaining a second beat-frequency distribution from the beat signal at the time of down-chirping in which the frequency of the transmission signal descends so as to determine a frequency peak in the second beat-frequency distribution; an up-chirp-beat-frequency tracking step of performing tracking processing on a frequency peak in the first beat-frequency distribution over a span of a plurality of up-chirping time-intervals, and of generating first beat-frequency time-series data from the frequency peak whose correlation is obtained by the tracking processing; an up-chirp-target detection step of calculating a first range and range-change rate to the target from the first beat-frequency time-series data; a down-chirp-beat-frequency tracking step of performing tracking processing on a frequency peak in the second beat-frequency distribution over a span of a plurality of down-chirping time-intervals, and of generating second beat-frequency time-series data from the frequency peak whose correlation is obtained by the tracking processing; and a down-chirp-target detection step of calculating a second range and range-change rate to the target from the second beat-frequency time-series data. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 25)
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22. A radar processing method, comprising:
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a transmission step of generating a transmission signal whose frequency periodically increases and decreases in a constant modulation width, and of radiating the transmission signal into space; a reception step of acquiring a reception signal by receiving a reflected signal of the transmission signal by a target, and of generating a beat signal by mixing the reception signal with the transmission signal; a beat-frequency generation step of obtaining a first beat-frequency distribution from the beat signal at the time of up-chirping in which the frequency of the transmission signal ascends so as to determine a frequency peak in the first beat-frequency distribution, and of obtaining a second beat-frequency distribution from the beat signal at the time of down-chirping in which the frequency of the transmission signal descends so as to determine a frequency peak in the second beat-frequency distribution; an up-chirp-beat-frequency tracking step of performing tracking processing on a frequency peak in the first beat-frequency distribution over a span of a plurality of up-chirping time-intervals, and of generating first beat-frequency time-series data from the frequency peak whose correlation is obtained by the tracking processing; an up-chirp-target detection step of calculating a first state vector of the target from the first beat-frequency time-series data; a down-chirp-beat-frequency tracking step of performing tracking processing on a frequency peak in the second beat-frequency distribution over a span of a plurality of down-chirping time-intervals, and of generating second beat-frequency time-series data from the frequency peak whose correlation is obtained by the tracking processing; and a down-chirp-target detection step of calculating a second state vector of the target from the second beat-frequency time-series data. - View Dependent Claims (23, 24)
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26. A radar processing method, comprising:
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a transmission step of generating a transmission signal whose frequency periodically increases and decreases in a constant modulation width, and of radiating the transmission signal into space; a reception step of acquiring a reception signal by receiving a reflected signal of the transmission signal by a target, and of generating a beat signal by mixing the reception signal with the transmission signal; a beat-frequency generation step of obtaining a beat-frequency distribution from the beat signal at either the time of up-chirping in which the frequency of the transmission signal ascends or the time of down-chirping in which the frequency of the transmission signal descends so as to determine a frequency peak in the beat-frequency distribution; an up-chirp-beat-frequency tracking step of performing tracking processing on a frequency peak in the beat-frequency distribution over either a span of a plurality of up-chirping time-intervals or a span of a plurality of down-chirping time-intervals, and of generating beat-frequency time-series data from the frequency peak whose correlation is obtained by the tracking processing; and a target detection step of calculating a range and range-change rate to the target from the beat-frequency time-series data.
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Specification