WO2007029519A1 - 距離測定装置、及び距離測定方法 - Google Patents
距離測定装置、及び距離測定方法 Download PDFInfo
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- WO2007029519A1 WO2007029519A1 PCT/JP2006/316683 JP2006316683W WO2007029519A1 WO 2007029519 A1 WO2007029519 A1 WO 2007029519A1 JP 2006316683 W JP2006316683 W JP 2006316683W WO 2007029519 A1 WO2007029519 A1 WO 2007029519A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
- G01S13/10—Systems for measuring distance only using transmission of interrupted, pulse modulated waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
- G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
Definitions
- the present invention relates to a distance measuring device and a distance measuring method, and more specifically, detects a mixed wave of a traveling wave output from a signal source and a reflected wave in which the traveling wave is reflected by an object to be measured.
- the present invention relates to a distance measuring device and a distance measuring method for measuring a distance to a measurement object.
- radars such as pulse radars and FMCW radars are known as distance measuring devices using radio waves.
- Pulse radar calculates the distance to a measurement object by measuring the time it takes for a pulse signal to be transmitted and reflected back by the measurement object.
- the FMCW radar transmits a continuous wave that is swept in frequency, and measures the distance to the object of frequency difference measurement between the transmitted signal and the reflected signal.
- radars such as spread spectrum radar and coded pulse radar, which measure the distance based on the round trip time of the signal to the object to be measured in the same way as pulse radar.
- the above-mentioned radar basically measures the round trip time of the signal to the measurement object, and the resolution within tens of meters is insufficient, so short distances within several tens of meters. It was difficult to measure.
- FMCW radar measures the distance from the frequency difference between the transmitted signal and the reflected signal to the object to be measured, so it requires linearity of the frequency change of the transmitted signal, or the transmitted signal leaks to the receiving side.
- “False Target” occurs, and the transmission signal is output to the receiving side in order to output the transmission signal accurately so that the linearity of the frequency change is satisfied, and to prevent the occurrence of “False Target”.
- the distance measuring device described in Patent Document 1 detects a standing wave generated by interference between a traveling wave having only one frequency component and a reflected wave reflected from the measurement object by the traveling wave.
- FMCW radars etc.
- the distance measuring device described in Patent Document 1 is effective when the moving distance within the measurement time in which the moving speed between the measurement object and the distance measuring device is relatively slow can be ignored.
- the moving distance within the measuring time when the moving speed of the object to be measured and the distance measuring device is fast cannot be ignored, it is difficult to obtain a correct measurement value by the Doppler effect.
- the frequency of the signal having one frequency component is increased or decreased by a predetermined step frequency and transmitted as a traveling wave. Detects the amplitude of the standing wave generated by the interference of the reflected wave reflected from the measurement object with the traveling wave, calculates the signal corresponding to the detected amplitude, and calculates the distance between the detection point and the measurement object.
- a distance measuring device for example, see Patent Document 2 and Non-Patent Document 1.
- the distance measuring device described in Patent Document 2 and Non-Patent Document 1 is a signal corresponding to the amplitude of a standing wave generated by interference between a traveling wave whose frequency is increased or decreased at a predetermined step frequency and its reflected wave. It was possible to calculate the distance between the detection point and the measurement object and the relative velocity with the measurement object at the same time. In addition, since the distance between the detection point and the measurement object is obtained using a standing wave in the same manner as the distance measurement device described in Patent Document 1, the structure can be simplified as a distance measurement device. .
- Patent Document 1 Japanese Patent Laid-Open No. 2002-357656
- Patent Document 2 Japanese Unexamined Patent Application Publication No. 2004-325085
- Non-Patent Document 1 “Short-range high-resolution radar using standing waves that can measure the position and velocity of a moving object”, Shingo Fujimori, Tetsushi Kamibo, Tadamitsu Iriya, IEICE Transactions, V01.J87 -B, no .3, pp.437-445, March 2004
- the signal output from the signal source is shown in FIG.
- the frequency is switched in steps so that a signal (wave) of frequency f within a specific bandwidth is output during At, and then the aa signal of frequency f + ⁇ is output during At. ing.
- the signal output from the signal source is transmitted from a transmitter such as an antenna, is reflected by the measurement object, and returns (arrives) to the detection point as a reflected wave.
- a standing wave is generated.
- the frequency f the frequency f
- the standing wave is not generated until the reflected wave corresponding to this frequency fa reaches the detection point after the traveling wave is output. From the beginning, it took time for the traveling wave of this frequency to be reflected by the measurement object and for the reflected wave to reach the detection point.
- the time interval At for switching the frequency cannot be made smaller than the time from when the frequency changes until the standing wave is generated. Therefore, a distance measurement device using standing waves calculates the distance spectrum from the relationship between the acquired signal level and frequency, and obtains the distance to the measurement object. However, the measurement object moves at a relative speed V. When speaking, the Doppler effect shifted the peak of the distance spectrum, resulting in a measurement error of V ⁇ t / Af-f, as shown in FIG.
- the invention of the present application has the features of "simple configuration”, “short range measurement is possible”, and “measurement error is small”, similar to the distance measurement device using a standing wave, It is another object of the present invention to provide a distance measuring device and a distance measuring method that are practically unaffected by the Doppler effect.
- a distance measuring device includes: a signal source that outputs a signal having a plurality of different frequency components within a specific bandwidth; a transmission unit that transmits the signal as a wave; and A mixed wave of a traveling wave consisting of either a transmitted wave or a signal output from the signal source and a reflected wave reflected from the measurement object by the wave transmitted from the transmitter
- a mixed wave detection unit for detection, a frequency component analysis unit for analyzing the frequency component of the mixed wave detected by the mixed wave detection unit, and a spectrum analysis of the data analyzed by the frequency component analysis unit to obtain a distance spectrum.
- a distance calculation unit for calculating the distance to the object to be measured.
- the distance measuring method transmits a signal having a plurality of different frequency components within a specific bandwidth as a wave, and a traveling wave composed of one of the transmitted wave or the signal;
- the transmitted wave is detected as a mixed wave with the reflected wave reflected by the measurement object, the frequency component of the detected mixed wave is analyzed, and the data analyzed by the frequency component analysis is spectrally analyzed.
- the spectrum is obtained and the distance to the measurement object is calculated.
- the mixed wave of the traveling wave and the reflected wave is detected, and the distance to the measurement object is calculated based on the mixed wave! /, So the traveling wave (transmitted signal) and the reflected wave (received signal) ) Can be obtained as a distance measuring device having a simple and simple structure.
- the traveling wave transmitted signal
- the reflected wave received signal
- the frequency is switched in multiple steps. Therefore, it is impossible to measure the distance at high speed in principle, but the present invention which does not use the standing wave is the time required for frequency switching in principle because there is no concept of frequency switching. No distance exists, distance measurement using standing waves Distance measurement can be performed at a higher speed than the apparatus.
- the signal source includes a plurality of single frequency oscillators each oscillating different single frequency components and an adder for synthesizing signals oscillated from the plurality of single frequency oscillators. Hey.
- the signal source may include a single frequency oscillator that oscillates a single frequency component, and a modulator that modulates a signal oscillated from the single frequency oscillator.
- the signal source may be a noise source that outputs a frequency component within the specific bandwidth.
- the frequency component analysis unit converts an AD converter that converts the mixed wave detected by the mixed wave detection unit into a digital signal, and a frequency component of output data from the AD converter power. It may be composed of a signal processing device that analyzes and calculates the magnitude of each frequency component.
- the frequency component analysis unit may include a plurality of band-pass filters and a level detector that detects an output level of the band-pass filter.
- the distance calculation unit may calculate a distance spectrum by performing a first-phase analysis on the data analyzed by the frequency component analysis unit.
- a plurality of the mixed wave detectors are provided at different positions, the frequency component analyzer analyzes frequency components for each of the mixed waves detected by the mixed wave detector, and the distance calculator Calculate the distance spectrum using the frequency component analysis data of multiple mixed waves obtained.
- another distance measuring apparatus provides a signal source that outputs a frequency modulation signal obtained by frequency-modulating a carrier wave having a specific frequency with an arbitrary period signal, and transmits the frequency modulation signal as a wave.
- a traveling wave that is one of the power transmitted from the transmission unit or the frequency modulation signal output from the signal source force, and the wave transmitted from the transmission unit is reflected by the measurement object.
- a mixed wave detection unit that detects a mixed wave with the reflected wave, an amplitude component detection unit that detects an amplitude component of the mixed wave detected by the mixed wave detection unit, and an amplitude detected by the amplitude component detection unit Ingredients It is composed of a distance calculation unit that calculates the distance spectrum by calculating the distance spectrum and calculates the distance to the measurement object.
- the distance measuring method transmits a signal obtained by frequency-modulating a carrier wave of a specific frequency with an arbitrary periodic signal as a wave, and the transmitted wave or the frequency-modulated signal is! /
- a mixed wave of a traveling wave that is a force and a reflected wave in which the transmitted wave is reflected by the measurement object is detected, an amplitude component of the detected mixed wave is detected, and the amplitude component is spectrally analyzed. To obtain the distance spectrum and measure the distance to the measurement object.
- the traveling wave does not leak into the receiver!
- a distance measuring device with a simple and simple structure that eliminates the necessity of separating the transmitting and receiving antennas.
- standing waves do not occur until the reflected wave corresponding to the frequency returns to the detection point after switching the frequency, and the frequency is increased in multiple steps.
- the present invention that does not use standing waves is fundamentally required for frequency switching because there is no concept of frequency switching. There is no time, and distance measurement can be performed faster than distance measurement devices that use standing waves.
- the distance calculation unit may calculate a distance spectrum by performing a Fourier analysis on the amplitude component detected by the amplitude component detection unit.
- a plurality of the mixed wave detectors are provided at different positions, and the amplitude component detector detects an amplitude component for each mixed wave detected by the mixed wave detector, and the distance calculation The unit may calculate a distance spectrum using the obtained amplitude component data of a plurality of mixed waves.
- another distance measuring device outputs a double modulation signal obtained by doubly frequency-modulating a carrier wave of a specific frequency with a second modulation signal that is frequency-modulated in advance by the first modulation signal.
- a traveling wave that has one of the following: a signal source for transmitting, a transmitter for transmitting the double modulated signal as a wave, and a wave transmitted from the transmitter or the double modulated signal output from the signal source power And the transmission force transmitted by the measuring object
- a mixed wave detector that detects a mixed wave with the reflected wave that has been reflected, an amplitude component detector that detects an amplitude component of the mixed wave detected by the mixed wave detector, and an amplitude component detector Detected amplitude component force
- a single frequency selection unit that selects one specific frequency component, a signal level detection unit that detects the level of the signal obtained by the single frequency selection unit, and the signal level It consists of a distance calculator that calculates the distance from the signal level obtained by the detector to the object to be measured.
- the distance measuring method transmits a double modulated signal in which a carrier wave of a specific frequency is doubly modulated with a second modulated signal that has been frequency modulated in advance by the first modulated signal as a wave, A mixed wave of a traveling wave consisting of one of the transmitted wave or the double modulation signal and a reflected wave reflected from the measurement object by the wave transmitted from the transmitter is detected and detected.
- the amplitude component of the mixed wave is detected, one specific frequency component is selected from the amplitude component, the signal level of the selected frequency component is detected, and the distance from the signal level to the measurement object is measured.
- the mixed wave of the traveling wave and the reflected wave is detected, and the distance to the measurement object is calculated based on the mixed wave! /, So the traveling wave (transmitted signal) and the reflected wave (received signal) ) Can be obtained as a distance measuring device having a simple and simple structure.
- the traveling wave transmitted signal
- the reflected wave received signal
- the frequency is switched in multiple steps. Therefore, it is impossible to measure the distance at high speed in principle, but the present invention which does not use the standing wave is the time required for frequency switching in principle because there is no concept of frequency switching. There is nothing, and distance measurement can be performed at a higher speed than distance measurement devices that use standing waves.
- the signal source may generate a first modulated signal for generating the first modulated signal, the second modulated signal modulated by the first modulated signal, and the carrier wave, respectively. Further, the signal source may include a double modulation signal storage means for storing the double modulation signal in advance.
- the signal source may include second modulation signal storage means for storing the second modulation signal in advance and carrier wave generation means for generating the carrier wave.
- the first modulation signal is a signal that draws a waveform that increases or decreases stepwise in a specific first period
- the second modulation signal is a sawtooth wave having a period shorter than the first period. As a signal modulated by 1 modulation signal.
- the distance measuring apparatus and distance measuring method according to the present invention configured as described above detects the mixed wave of the traveling wave and the reflected wave reflected by the measurement object, and thus proceeds to the receiving antenna.
- a simple structure that does not need to prevent waves from leaking can be obtained, and a low-cost and small-sized distance measuring device can be obtained.
- the distance force that is the peak of the magnitude is also measured between the measurement object and the mixed wave detector. The distance can be determined.
- the frequency switching time cannot be shortened in principle compared to the time when the standing wave can be generated by switching the frequency of the traveling wave. Measurement error occurs due to the influence, but in the present invention there is no concept of frequency switching in principle, so the observation time can be shortened to such an extent that the influence of the Doppler effect can be almost ignored. It is possible to measure an accurate distance regardless of the moving speed and moving direction of the measurement object.
- the position of each measurement object can be measured even when the distance between multiple measurement objects that were difficult to measure is close and the speed difference is large. It can be measured correctly.
- a plurality of mixed wave detectors are provided at different positions, and a distance spectrum is obtained from the plurality of mixed wave detectors detected by the plurality of mixed wave detectors, so that more reliable and accurate can be obtained. High distance measurement can be performed.
- the signal processor is composed of devices such as detectors, quadrature detectors, bandpass filters, and matched filters, and the magnitude (signal level) of the distance spectrum is detected, so it is abbreviated as a signal processor using a microprocessor.
- FIG. 1 is a block diagram illustrating an outline of a distance measuring device according to a first embodiment.
- FIG. 2 is an explanatory diagram of a distance measuring device that performs simulation in the first embodiment.
- FIG. 3 is a graph showing a simulation result of distance measurement of a measurement object having a distance of 10 m and an Okm / hour speed in the first embodiment.
- FIG. 4 is a graph showing a simulation result of distance measurement of a measurement object having a distance of 10 m and a speed of +300 km in the first embodiment.
- FIG. 5 is a graph showing a simulation result of distance measurement of a measurement object at a distance of 40 m and a speed of 50 km in the first embodiment.
- FIG. 6 is a graph showing a simulation result of distance measurement of a measurement object at a distance of 5 m, a speed of +100 km, a distance of 12.5 m, and a speed of 300 km in the first embodiment.
- FIG. 7 is an explanatory diagram of a distance measuring device including a plurality of mixed wave detectors in the first embodiment.
- FIG. 8 is a block diagram illustrating an outline of a distance measuring device according to a second embodiment.
- FIG. 9 is an explanatory diagram of a distance measuring device that performs simulation in the second embodiment.
- FIG. 10 is a graph showing a simulation result of distance measurement of a measurement object having a distance of 10 m and an Okm / hour speed in the second embodiment.
- FIG. 11 is a graph showing a simulation result of distance measurement of a measurement object having a distance of 10 m and a speed of +300 km in the second embodiment.
- FIG. 12 is a graph showing a simulation result of distance measurement of a measurement object at a distance of 40 m and a speed of 50 km in the second embodiment.
- FIG. 13 is a graph showing a simulation result of distance measurement of a measurement object at a distance of 5 m, a speed of +100 km, a distance of 12.5 m, and a speed of 300 km in the second embodiment.
- FIG. 14 is an explanatory diagram of a distance measuring device including a plurality of mixed wave detectors in the second embodiment.
- FIG. 15 is a block diagram illustrating an outline of a distance measuring device according to a third embodiment.
- FIG. 16 A block diagram illustrating another example of the signal source in the third embodiment.
- FIG. 19 is an explanatory diagram of a distance measuring device using a quadrature detector in the third embodiment.
- FIG. 20 is a graph showing a simulation result of distance measurement of a measurement object having a distance of 12 m and a distance of 20 m by the distance measurement device using the quadrature detector in the third embodiment.
- 21 An explanatory diagram of a distance measuring device using a bandpass filter in the third embodiment.
- FIG. 22 is a graph showing a simulation result of distance measurement of a measurement object at a distance of 12 m and a distance of 20 m by a distance measurement device using a bandpass filter in the third embodiment.
- the distance measuring device and the distance measuring method according to the present invention transmit the signals output from the signal sources 1, 9, and 13 as waves from the transmitting unit 2, as shown in FIGS.
- the mixed wave detector 3 divides the reflected wave V reflected by the object 6 to be measured (traveling wave V).
- the signal source in the present invention outputs a signal having a plurality of different frequency components within a specific bandwidth, or outputs a frequency modulation signal obtained by frequency-modulating a carrier wave of a specific frequency with an arbitrary periodic signal. Alternatively, it outputs a double-modulated signal obtained by doubly frequency-modulating a carrier of a specific frequency with a second modulated signal that has been frequency-modulated in advance by the first modulated signal. That is, the signals output from the signal sources 1, 9, and 13 are always signals having a plurality of different frequency components.
- the traveling wave in the present invention is a wave transmitted from the signal source 1, 9, 13 from the transmitter 2, or a signal output from the signal source 1, 9, 13.
- the traveling wave in the present invention is a wave or signal (signal wave) always having a plurality of frequency components.
- the reflected wave according to the present invention is a wave in which a wave having a plurality of frequency components is always reflected by the measuring object 6.
- the mixed wave in the present invention is a wave in which the traveling wave and the reflected wave are mixed (synthesized). That is, a wave in which a traveling wave having a plurality of frequency components and the reflected wave having a plurality of frequency components are superimposed is a mixed wave in the present invention, and a plurality of waves (waves) having a single frequency component are superimposed. It does not indicate the combined waves.
- an electromagnetic wave is described as an example of a wave, but a wave such as light, a sound wave, an electric current, and a material wave propagating in the substance is also a wave in the present invention.
- Non-Patent Document 1 is a signal that switches the frequency of a single frequency component in a stepwise manner, and is not a signal that always has a plurality of different frequency components as in the present invention. Further, based on the signal having the single frequency component, the traveling wave transmitted by the interference of the traveling wave of the single frequency component and the reflected wave reflected by the measurement object is generated. The amplitude varies with time. It becomes a different value depending on the position in the space where the conversion becomes. Specifically, the amplitude is a periodic function with respect to the position, which is called a standing wave.
- the relationship between the position in space and the amplitude of the mixed wave involves a temporal change. It becomes a different phenomenon.
- the distance measuring device uses a physical phenomenon different from the distance measuring device using a standing wave, and is different in principle.
- FIG. 1 is an explanatory diagram for explaining an outline of a distance measuring device according to the present invention.
- the distance measuring device according to the invention of the present application transmits a signal (traveling wave V) output from the signal source 1
- the mixed wave V of the reflected wave V and the traveling wave V transmitted from the part 2 as a wave to the measurement object 6 and reflected by the kth measurement object 6 is detected by the mixed wave detection part 3, and the frequency component k TC
- the analysis unit 4 analyzes the frequency component (a (f, x)) of the mixed wave, and the distance calculation unit 5 analyzes the distance spectrum s.
- R (X) is calculated and the distance to the measuring object 6 is measured.
- the signal source 1 outputs a signal having a plurality of different frequency components within a specific bandwidth, and always outputs a signal including two or more frequency components.
- the signal source 1 includes a plurality of single frequency oscillators each oscillating a single frequency component signal, and a single frequency component signal oscillated from the plurality of single frequency oscillators.
- the signal source 1 always outputs a signal with two or more frequency components.
- the signal source 1 includes a single frequency oscillator that oscillates a single frequency component and a modulator that applies a predetermined modulation such as frequency modulation or amplitude modulation to the signal oscillated by the single frequency oscillator.
- signals having different frequency components within a specific bandwidth may be output.
- a noise source that outputs frequency components within a specific bandwidth.
- a noise source that outputs a frequency component within a specific bandwidth for example, a signal output from the noise source is a bandpass filter. This can be realized by passing only signals within a specific band.
- the transmitter 2 is a bidirectional element such as an antenna (or electrode) for transmitting the signal output from the signal source 1 as a wave.
- the transmission unit 2 may play a role of receiving the reflected wave.
- the transmitter 2 outputs a wave of the frequency component output from the signal source 1, and the output wave is transmitted to the measurement object 6.
- the traveling wave V in the present invention is a wave and signal transmitted from the transmitter 2.
- the mixed wave detection unit 3 detects a mixed wave of the signal from the signal source 1 and the reflected wave signal returned via the transmission unit 2, the signal from the signal source 1 is a traveling wave V
- the mixed wave detector 3 detects a mixed wave V of the traveling wave V and the reflected wave V.
- This mixed wave detection unit 3 includes a traveling wave V output from the signal source 1 and a reflected wave V returned via the transmission unit 2 in the middle of the feed line connecting the signal source 1 and the transmission unit 2.
- It can be configured by providing a non-directional coupler for detecting C.
- the receiving antenna for detecting the mixed wave V of the traveling wave V and the reflected wave V is used.
- the frequency component analysis unit 4 includes the mixed wave V detected by the mixed wave detection unit 3.
- the frequency component is analyzed.
- the frequency component analyzer 4 can be configured by a plurality of bandpass filters and a level detector for detecting the output level of the bandpass filter, and the size of each frequency component can be analyzed.
- the AD wave that converts the mixed wave detected by the mixed wave detector 3 into a digital signal, and the digital signal of the mixed wave that is output from the AD converter performs frequency component analysis such as Fourier transform, and each frequency is analyzed.
- It can also be constituted by a signal processor incorporating the wear.
- the mixed wave detected by the mixed wave detector 3 may be output directly to the AD converter, but a down converter 8 (see FIG. 2) is provided between the mixed wave detector 3 and the AD converter. It may be provided so that the frequency is lowered before input to the AD converter.
- the downconverter 8 may be a known downconverter.For example, the local oscillator 8a that oscillates the frequency to be downconverted, the mixed wave V detected by the mixed wave detector 3, and the previous
- It may be constituted by a mixer (frequency converter) 8b that mixes the periodic signal from the local oscillator 8a and down-converted to a desired frequency.
- the distance calculation unit 5 performs spectrum analysis on the data analyzed by the frequency component analysis unit 4 to obtain a distance spectrum, calculates the size of the distance spectrum, and calculates the size of the distance spectrum.
- the distance to the measuring object 6 is calculated on the basis of the peak.
- analysis is performed by an appropriate spectrum analysis method such as a non-parametric method represented by Fourier transform or a parametric method such as AR modeling.
- the distance of the k-th measurement object 6 is d, the velocity is V, the magnitude and phase of the reflection coefficient are k k
- Equation (2) the reflected wave V from the object to be measured 6 is represented by the table k k Rk as shown in Equation (2) below.
- Vcit, x s ) V T (t, x s ) + ⁇ V Rk (t, x s ) i df
- the mixed wave V detected by the mixed wave detector 3 is passed through a band-pass filter and each frequency component is detected.
- V c (f, t, x s ) A (f) .e j9 ( -f>. 6 ⁇ / (*- ⁇ ) + ⁇ I (4)
- a (f) represents the frequency characteristics of the signal source 1 and can be easily known. If A (f) can be regarded as a constant A,
- Equation (8) is a periodic function with a period of cZ2 (d — X) with respect to frequency f.
- the distance d -X from the mixed wave detector 3 to the measurement object can be obtained.
- the value is the distance d — X between the mixed wave detector 3 and the measurement object 6. That is, the value of I R (x) I k s
- the position from the mixed wave detector 3 to the measurement object 6 can be obtained (S 104 (see FIG. 2)).
- the traveling wave and the reflected wave are detected.
- a simple structure that does not need to be separated can be obtained, and a small distance measuring device can be obtained at low cost.
- the distance force that is the peak of the magnitude is also measured between the measurement object and the mixed wave detector. The distance can be determined.
- the Doppler effect can not be shortened in principle because the observation time cannot be made shorter than the time at which force waves can be generated by switching the frequency of traveling waves.
- the observation time can be shortened to such an extent that the influence of the Doppler effect can be almost ignored. The distance can be measured.
- the signal source 1 outputs a signal that uniformly includes components from 24,000 GHz to 24.075 GHz, and the traveling wave that uniformly includes the components within the bandwidth from the transmitter 2 Send V to the measurement object 6, ..., 6. And reflected by the kth measurement object 6
- the mixed wave detection unit 3 detects the mixed wave V (t, 0) of the reflected wave V and the traveling wave V. K T C
- the detected mixed wave V is down-converted to 0 to 75 MHz by the Dow s C converter 8.
- the down-converted V is converted to a digital signal by AD conversion (S 100) and converted to a digital signal.
- V (f, t, 0) is Fourier transformed to be decomposed into frequency components (S101).
- the normalized amplitude a (f, 0) is obtained.
- This normalized amplitude a (f, 0) is obtained by spectral analysis to obtain the distance spectrum R (X) (S 103), and the peak force of the magnitude (intensity) of the distance vector R (x) is also determined by the position of the measuring object 6. Is calculated (S104). The direction in which the speed of the measuring object 6 moves away from the distance measuring device is positive, and the direction approaching the distance measuring device is negative.
- the mixed wave V is down-converted to 0 to 75 MHz.
- Equation (10) a (f, 0) is Fourier-transformed to obtain the distance spectrum R (x) and the distance spectrum size (I R (x) I).
- FIG. 3 is a graph simulating when the measurement object 6 is stationary at a distance of 10 m from the mixed wave detection unit 3 at a speed of Okm per hour.
- Figure 3 (a) shows the down-converted mixed wave (advanced It is a time waveform of the traveling wave + reflected wave), and is a graph showing the instantaneous value at each time of the measurement time (a graph of V (t, 0) down-converted).
- Figure 3 (b) is shown by equation (8).
- Fig. 3 (c) is a graph showing the relationship between the distance and the magnitude of the distance spectrum I R (x) I by spectral analysis of a (f, 0) obtained by Fig. 3 (b).
- the distance spectrum has a large peak value at a distance of 10 m. This means that the force can be measured in positive U and distance when it is stationary.
- FIG. 4 is a graph simulating when the measurement object 6 is moving from the mixed wave detection unit 3 at a distance of 10 m and at a speed of +300 km.
- Figure 4 (a) is a time waveform of the down-converted mixed wave (traveling wave + reflected wave), and is a graph showing the instantaneous value at each time of the measurement time (down-converted V (t, 0 ).
- Figure 4 (b) shows the formula (a)
- Fig. 4 (c) is a graph showing the relationship between the distance and the size of the distance spectrum I R (x) I by spectral analysis of a (f, 0) obtained by Fig. 4 (b).
- the distance spectrum has a large peak at a distance of 10 m. Therefore, even when the measurement object moves at + 300km! /, It can measure the correctness! /, As in the simulation 11.
- FIG. 5 is a graph simulating when the measurement object 6 is moving from the mixed wave detector 3 at a distance of 40 m and a speed of 50 km / h.
- Figure 5 (a) shows the time waveform of the down-converted mixed wave (traveling wave + reflected wave), and shows the instantaneous value at each time of the measurement time (the down-converted V (t, 0)).
- Figure 5 (b) shows the formula (8).
- Fig. 5 (c) is a graph showing the relationship between the distance and the magnitude of the distance spectrum IR (x) I by spectral analysis of a (f, 0) obtained by Fig. 5 (b).
- the distance vector has a large peak at a distance of 40 m. Therefore, it is possible to measure the correct distance even if the distance to the measurement object, the moving speed and the moving direction are changed. ⁇
- Figure 6 shows two measurement objects 6.One measurement object 6 moves at a distance of 5 m from the mixed wave detection unit 3 at a speed of +100 km, and the other measurement object 6 moves from the mixed wave detection unit 3. This is a graph simulating when moving at a distance of 12.5 m and a speed of 300 km / h.
- Figure 6 (a) is the time waveform of the down-converted mixed wave (traveling wave + reflected wave), and is a graph showing the instantaneous value at each time of the measurement time (down-converted V (t, 0 Dara
- Fig. 6 (b) is a graph of a (f, 0) shown in Equation (8), showing the normalized amplitude of each frequency component.
- Figure 6 (c) is a graph showing the relationship between the distance and the magnitude of the distance spectrum IR (x) I by spectral analysis of a (f, 0) obtained by Fig. 6 (b). .
- the distance spectrum has large peak values at distances of 5m and 12.5m. This means that even if there are multiple objects to be measured, the correct distance can be measured. In addition, the correct distance can be measured even at a short distance of 10 m or less.
- the distance measurement device using standing waves correctly measures the position of each measurement object even when the distance between multiple measurement objects that were difficult to measure is close and the speed difference is large. be able to.
- the distance of the measurement object can be measured regardless of the speed of the measurement object. Furthermore, the distance between the plurality of measurement objects is close and the speed difference is large. Even at this time, the position of each measurement object can be measured correctly.
- the mixed wave is detected by one mixed wave detection unit 3.
- the mixed wave V detected from the plurality of mixed wave detectors 3, 3, 3 is a mixed wave.
- a / D conversion is performed by the AD converter for each detection unit 3 (S110), the mixed wave signal converted to a digital signal is Fourier transformed (S111), the absolute value is calculated, and the amplitude a for each mixed wave detection unit 3 (f, ⁇ ) (i is 1, 2, ⁇ , N, ⁇ ). Then, by removing the difference between any two amplitudes (eg, a (f, X) si sl and a (f, x;)), the unnecessary DC component (the first term in Equation (8)) is removed. (Sl
- FIG. 8 is an explanatory diagram for explaining the outline of the distance measuring apparatus according to the present invention.
- the signal output from the signal source 9 is transmitted as a wave from the transmission unit 2 to the measuring object 6 and reflected by the kth measuring object 6.
- the amplitude component (a (t, X)) of the wave is detected, the distance spectrum R (x) is calculated by the distance calculation unit 11, and the distance to the measuring object 6 is measured.
- the signal source 9 outputs a frequency modulation signal obtained by frequency-modulating a carrier wave of a specific frequency with an arbitrary periodic signal, and always outputs a signal including two or more frequency components.
- the signal source 9 includes a carrier signal source 9a that transmits a carrier signal of a specific frequency, and a modulation signal source 9b that modulates the carrier signal with an arbitrary periodic signal.
- the signal source 9 outputs a frequency modulation signal.
- frequency modulation signal generation means having a microprocessor and frequency modulation signal storage means for storing data for outputting a frequency modulation signal of an instantaneous frequency f 0 + f D ⁇ ⁇ (Not shown), and the frequency modulation signal generation means may read out data stored in the frequency modulation signal storage means and generate a frequency modulation signal.
- the transmitter 2 is a bidirectional element such as an antenna (or electrode) for transmitting the signal output from the signal source 9 as a wave.
- the transmission unit 2 may play a role of receiving the reflected wave.
- the transmission unit 2 outputs a wave of the frequency component output from the signal source 9, and the output wave is transmitted to the measurement object 6.
- the traveling wave V in the present invention means the wave transmitted from the transmitter 2 and the signal.
- the mixed wave detection unit 3 detects a mixed wave of the signal from the signal source 9 and the reflected wave signal returned via the transmission unit 2, the signal from the signal source 9 is a traveling wave V.
- the mixed wave detector 3 detects a mixed wave V of the traveling wave V and the reflected wave V.
- This mixed wave detector 3 mixes the traveling wave V output from the signal source 9 and the reflected wave V returned via the transmitter 2 in the middle of the feed line connecting the signal source 9 and the transmitter 2.
- (Or electrode) is provided in the space between the transmitter 2 and the measuring object 6 and is used as the mixed wave detector 3.
- the amplitude component detection unit 10 detects the amplitude of the mixed wave V detected by the mixed wave detection unit 3.
- the component is detected, and it is configured according to the deviation of devices such as an envelope detector, square detector, synchronous detector, quadrature detector and the like.
- the distance calculation unit 11 obtains a distance spectrum by performing a spectrum analysis on the amplitude component detected by the amplitude component detection unit 10, calculates the magnitude of the distance spectrum, and calculates the magnitude of the distance spectrum.
- the distance to the object to be measured 6 is calculated based on the peak.
- a spectrum analysis method analysis is performed by an appropriate spectrum analysis method such as a non-parametric method represented by Fourier transform or a parametric method such as AR modeling.
- the signal source 9 modulates the carrier wave signal source 9a having the frequency f and the carrier wave of the carrier wave signal source 9a.
- the elapsed time t of the measurement starting force and the traveling wave V at the position X become a frequency-modulated continuous wave as represented by the following formula (11). .
- t is the elapsed time of the measurement starting force
- m (t) is a modulation signal, and is an arbitrary periodic function with an amplitude of 1.
- the maximum frequency deviation of the frequency modulation is f f
- the distance of the k-th measurement object 6 is d, the velocity is V, the magnitude and phase of the reflection coefficient are k k
- V Rk (t, x) A k e j4> h .e j & . 27 ⁇ . ⁇ (12)
- Equation (16) When approximated as dt, Equation (16) becomes the following Equation (18).
- Equation (18) has a period of cZ2 (d ⁇ x) with respect to the instantaneous frequency f + f ⁇ ⁇ ( ⁇
- the power of k s I at the peak is the distance d ⁇ X to be obtained.
- the mixed wave of the traveling wave and the reflected wave reflected by the measurement object is detected, so the traveling wave and the reflected wave are detected.
- a simple structure that does not need to be separated can be obtained, and a small distance measuring device can be obtained at low cost.
- the distance force that is the peak of the magnitude is also measured between the measurement object and the mixed wave detector. The distance can be determined.
- the Doppler effect can not be shortened in principle because the observation time cannot be made shorter than the time when force standing waves can be switched by switching the frequency of traveling waves.
- the observation time can be shortened to such an extent that the influence of the Doppler effect can be almost ignored. Measuring distance it can.
- the A mixed wave detector 3 detects a mixed k T wave V (t, 0) of the reflected wave V reflected by the k-th measurement object 6 and the traveling wave V. Observation of mixed wave V is 1 c c of modulated signal m (t)
- the direction away from the distance is positive and the direction closer to the distance measuring device is negative.
- the detected mixed wave V is subjected to envelope detection by an envelope detector to detect the mixed wave.
- the width component a (t, 0) is detected (S120).
- the amplitude component a (t, 0) of the mixed wave is detected, it is converted into a digital signal by the AD converter (S121).
- spectrum analysis is performed on the digitally converted amplitude a (t, 0) to obtain a distance spectrum R (x) (S122).
- the peak force of the obtained distance spectrum size is also calculated for the position of the measuring object 6 (S 123).
- FIG. 10 is a graph simulating when the measurement object 6 is stationary at a distance of 10 m from the position of the mixed wave detector 3 and at a speed of Okm.
- Fig. 3 (a) is a graph showing the modulation signal m (t) and the amplitude a (t, 0) of the mixed wave.
- Figure 10 (b) shows the size of the distance spectrum based on this analysis. As shown in Fig. 10 (b), the distance spectrum has a large peak value at a distance of 10 m. This means that the correct distance can be measured even when the distance is within a few tens of meters in a stationary state.
- Fig. 11 shows that the position of the object 6 to be measured is 3m at the distance of 10m and the speed + 300km / h. It is the graph which simulated the time of moving.
- Figure 11 (a) is a graph showing the modulation signal m (and the amplitude a (t, 0) of the mixed wave. Based on this, the spectrum analysis shows the magnitude of the distance spectrum. As shown in Fig. 11 (b), the magnitude of the distance spectrum has a large peak value at a distance of 10 m, which means that the measured object is +300 km. When moving! /, You can measure the correctness! /, As in Simulation 2-1.
- FIG. 12 is a graph simulating when the measurement object 6 is moving at a distance of 40 m and a speed of 50 km per hour from the position of the mixed wave detector 3.
- FIG. 12 (a) is a graph showing the modulation signal m (t) and the amplitude a (t, 0) of the mixed wave. Based on this, spectrum analysis shows the magnitude of the distance vector in Fig. 12 (b). As shown in Fig. 12 (b), the distance vector has a large peak at a distance of 40 m. From this, the correct distance can be measured even if the distance, moving speed and moving direction of the object to be measured change.
- FIG. 13 two measurement objects 6 and 6 are measured.
- One measurement object 6 moves from the position of the mixed wave detection unit 3 at a distance of 5 m at a speed of +100 km, and the other measurement object 6 moves a distance of 12.5 m from the position of the mixed wave detection unit 3 at a speed of ⁇
- FIG. 13 (a) is a graph showing the modulation signal m (t) and the amplitude a (t, 0) of the mixed wave.
- Figure 13 (b) shows the magnitude of the distance spectrum based on this analysis. As can be seen from Fig. 13 (b), the magnitude of the distance spectrum has large peak values at distances of 5 m and 12.5 m, respectively.
- the correct distance can be measured even when there are multiple objects to be measured.
- the correct distance can be measured even at a short distance of 10 m or less.
- the position of each measurement object can be measured correctly even when the distance between multiple measurement objects that were difficult to measure is close and the speed difference is large. it can.
- the distance of the measurement object can be measured regardless of the speed of the measurement object.
- the distance between multiple objects to be measured approaches and the speed difference is large! Even at times, the position of each object to be measured must be measured correctly. Can do.
- the mixed wave is detected by one mixed wave detector 3, but as shown in FIG. 14, a plurality of mixed wave detectors 3,. It may be placed in X, ..., X and sl sN. In this way, the mixed wave V detected from the plurality of mixed wave detectors 3, 3, 3
- the envelope is detected by the envelope detector for each mixed wave V detected by the multiplexing detector 3.
- the amplitude component of the mixed wave (amplitude a (t, x) (i is 1, 2, ..., N, ...)) is detected (S130), and each detected amplitude a (t, X) is AD converted by AD conversion (S131), and the sl s2 difference between any two amplitudes (eg, a (t, x) and &X;)) from the power of each amplitude converted into a digital signal
- the spectrum is analyzed for each amplitude a (t, x) from which the unnecessary DC component has been removed.
- each distance spectrum is averaged (S134), the distance from the peak of the distance spectrum size to the measurement object is calculated (S135).
- These include, for example, a DC component removing unit that removes an unnecessary DC component by taking a difference between two arbitrary amplitudes, and a distance spectrum averaging unit that calculates an average of a plurality of distance spectra. This can be realized by providing it in part 5. Remove the DC component with an analog circuit (differential amplifier, etc.), and then perform AD conversion.
- FIG. 15 is an explanatory diagram for explaining the outline of the distance measuring apparatus according to the present invention.
- the signal output from the signal source 13 is transmitted from the transmitter 2 to the measurement object 6 as a wave, and travels with the reflected wave V reflected by the kth measurement object 6.
- the mixed wave V with the wave V is detected by the mixed wave detector 3, and this mixed wave V is signal processed.
- the signal processor 14 It consists of a width component detection unit 15, a single frequency selection unit 16, a signal level detection unit 17, and a distance calculation unit 18.
- the amplitude component detection unit 15 detects the amplitude component (a (t, X)) of the mixed wave. And s
- the single frequency selection unit 16 selects a signal (R (x (t))) with only a specific frequency f and selects it.
- the signal level (IR (x (t)) I) of the selected signal is detected by the signal level detector 17 and the distance to the signal level force measurement object 6 is measured by the distance calculator 18.
- the signal source 13 outputs a signal (dual modulation signal) obtained by doubly frequency-modulating a carrier of a specific frequency with a second modulation signal that has been frequency modulated in advance by the first modulation signal. It always outputs a signal that contains two or more frequency components.
- the signal source 13 is composed of a carrier signal source 13a, a second modulation signal source 13b, and a first modulation signal source 13c.
- the first modulation signal source 13c outputs a first modulation signal x (t) having a specific first period.
- the second modulation signal source 13b outputs a second modulation signal m (t), and the second modulation signal m (t) is a specific signal generated by the second modulation signal source 13b.
- the carrier signal source 13a has an instantaneous frequency f + f
- the double modulated signal output from the signal source 13 in the present invention is obtained by frequency-modulating the carrier signal with the second modulated signal m (t), and the second modulated signal m (t) Is frequency-modulated with the first modulated signal x (t). Therefore, the dual modulation signal in the present invention is a carrier wave that is not a signal obtained by frequency-modulating a carrier signal with the second modulation signal m (t) but further frequency-modulating with the first modulation signal x (t). The signal after frequency-modulating the signal with the first modulated signal x (t) may not be further frequency-modulated with the second modulated signal m (t)! /.
- the signal source 13 is replaced with the carrier signal source 13a (carrier generation means), the second modulation signal generation means 13d, 2 Modulated signal storage means 13e.
- the second modulation signal storage means 13e stores data for outputting the second modulation signal m (t), and the second modulation signal generation means 13d is stored in the second modulation signal storage means 13e.
- the carrier signal source 13a oscillates a carrier wave having a specific frequency, and this carrier The wave is frequency-modulated with the second modulation signal m (t) and double-modulated with an instantaneous frequency f + f ⁇ ⁇ )
- the second modulation signal generating means 13d since the second modulation signal generating means 13d only generates the second modulation signal based on the force stored in advance by a microprocessor or the like, the Fourier analysis (frequency analysis in the measurement principles 1 and 2). Compared with the microprocessor used in), a low-performance processor can be used, and the cost can be reduced.
- double modulation signal generation means 13f having a microprocessor and data for outputting a double modulation signal having an instantaneous frequency f + f .m (t)
- Dual modulation signal storage means 13g, and the dual modulation signal generation means 13f reads the data stored in the dual modulation signal storage means 13g so as to generate a double modulation signal.
- the dual modulation signal generating means 13f can also use a processor having a lower function than a microprocessor used in force Fourier analysis (frequency analysis) provided with a microprocessor, and can be reduced in cost.
- the transmitter 2 is a bidirectional element such as an antenna (or an electrode) for transmitting the signal output from the signal source 13 as a wave.
- the transmission unit 2 may play a role of receiving a reflected wave.
- the transmitter 2 outputs a wave of the frequency component output from the signal source 13, and the output wave is transmitted to the measurement object 6.
- traveling wave V in the present invention is a wave and signal transmitted from the transmitter 2.
- the signal output from the signal source 13 is shown.
- the mixed wave detection unit 3 detects a mixed wave of the signal from the signal source 13 and the reflected wave signal returned via the transmission unit 2, the signal from the signal source 13 is a traveling wave V. It becomes.
- the mixed wave detector 3 detects a mixed wave V of the traveling wave V and the reflected wave V.
- This mixed wave detection unit 3 includes a traveling wave V output from the signal source 13 and a reflected wave V returned via the transmission unit 2 in the middle of the feed line connecting the signal source 13 and the transmission unit 2.
- T Rk T Rk Combined
- a receiving key for detecting the mixed wave V of the traveling wave V and the reflected wave V is used.
- An antenna (or an electrode) is provided in the space between the transmitter 2 and the measurement object 6 to form the mixed wave detector 3.
- the amplitude component detector 15 is configured to detect the amplitude of the mixed wave V detected by the mixed wave detector 3.
- the component is detected, and it is configured according to the deviation of devices such as an envelope detector, square detector, synchronous detector, quadrature detector and the like.
- the single frequency selection unit 16 selects one frequency component from the amplitude components of the mixed wave V detected by the amplitude component detection unit 15, and includes a quadrature detector and a band.
- the signal level detection unit 17 detects the level of the signal obtained by the single frequency selection unit 16, and is configured by any one of devices such as an envelope detector and a square detector. Is done. It is also possible to configure the signal level detection unit 17 with an AD converter, a microprocessor, etc., AD convert the output signal from the single frequency selection unit 16 and calculate the signal level with the microprocessor. It is.
- the distance calculation unit 18 calculates the distance to the measurement object 6 based on the signal level peak detected by the signal level detection unit 17.
- the signal source 13 double-modulates the carrier wave of a specific frequency with the second modulation signal that has been frequency-modulated in advance with the first modulation signal, and generates an instantaneous frequency f + f ⁇ ⁇ ( ⁇
- V T ⁇ t, x Ae je 6 ⁇ ⁇ (* -. ⁇ ) e j2nf D J m (t- ⁇ ) dt (20)
- t is the elapsed time from the start of measurement
- c is the speed of light
- A is the amplitude
- ⁇ is the phase
- M (t) is a stepped signal whose instantaneous value increases by ⁇ in the first period T, as shown in the second modulation and the following equation (22).
- the sawtooth wave recovery time shown in FIG. 17 may be a sawtooth wave having a force recovery time of 0 (ie, a triangular wave).
- x (t) is a stepped signal that increases by ⁇ in a specific first period T, but in principle, x (t) is the same as a stepped signal that decreases by ⁇ . It is. In the following, a stepped signal that increases x (t) by ⁇ X will be described.
- the first period T of the first modulation signal is longer than the period (repetition time) of the sawtooth wave of the second modulation signal.
- the period of the sawtooth wave of the second modulation signal is longer than the period of the carrier wave.
- the reflected wave V from the measurement object 6 is k k Rk as shown in the following equation (24).
- V Rk (t, x) A lk e ⁇ .. 2 . -. 2 e. 1-) dt
- Vc t V T (t, x s ) + ⁇ V (t
- the magnitude of the reflected wave may be considered to be very small.
- Equation 29 As an approximation, Equation (28) becomes the following Equation (30).
- a (t, X) is converted to a single frequency selector 16 s such as a quadrature detector or a bandpass filter.
- a quadrature detector is used as the single frequency selector 16 for selecting the component of the frequency f.
- the quadrature detection output R (x (t)) is called a distance spectrum.
- the level (magnitude) of the distance spectrum R (x (t)) is represented by its absolute value. That is, I R (x (t)) I is represented by the following formula (34).
- the traveling wave and the reflected wave are detected.
- a simple structure that does not need to be separated can be obtained, and a small distance measuring device can be obtained at low cost.
- the distance force that is the peak of the magnitude is also measured between the measurement object and the mixed wave detector. The distance can be determined.
- the Doppler effect can not be shortened in principle because the observation time cannot be made shorter than the time at which force waves can be generated by switching the frequency of traveling waves.
- the observation time can be shortened to such an extent that the influence of the Doppler effect can be almost ignored. The distance can be measured.
- a signal processor can be used with devices such as an envelope detector, square detector, synchronous detector, quadrature detector, bandpass filter, and matched filter. Since it is configured and the size of the distance span (signal level) is detected, a signal processor having substantially the same processing speed as a signal processor using a microprocessor or the like can be obtained at low cost. In other words, a signal processing speed V and a distance measuring device can be obtained at low cost.
- the traveling wave V expressed by Equation (20) is transmitted from 2. counter by the 6th measurement object 6
- the signal processor 19 determines the position of the object 6 to be measured.
- Fig. 19 shows an envelope detector 20 for detecting the amplitude component of the signal processor 19, frequency f
- FIG. 3 is an explanatory diagram of a distance measuring device including a quadrature detector 21 for selecting only a component of 1 MHz, a level detector 22 for detecting a signal level, and a distance calculating unit 23.
- FIG. 6 is a graph showing the position (x (t)) and the magnitude of the distance spectrum I R (x (t)) I when As can be seen from Fig. 20, the magnitude of the distance spectrum peaks at 12m and 20m. Therefore, the correct distance can be measured even if a quadrature detector or the like is used instead of the microprocessor or the like.
- FIG. 21 shows a distance measuring device in which the signal processor 24 is composed of an envelope detector 25 for detecting an amplitude component, two bandpass filters 26a and 26b, an envelope detector 27 for detecting a signal level, and a distance calculation unit 28. It is explanatory drawing.
- FIG 3 is a graph showing the position (x (t)) and the distance spectrum magnitude IR (x (t)) I.
- the magnitude of the distance spectrum peaks at 12m and 20m.
- the distance can be measured correctly.
- two band-pass filters are connected in series, but the number of band-pass filters is not limited to two, and of course any number can be used as necessary.
- the mixed wave is detected by one mixed wave detector 3, but a plurality of mixed wave detectors 3,..., 3 are arranged at different positions, respectively. It is also possible to obtain the distance spectrum based on the mixed wave detected from the sensor and measure the position of the measuring object 6
Description
Claims
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BRPI0615288A BRPI0615288A2 (pt) | 2005-09-02 | 2006-08-25 | dispositivo e método de medida de distância |
CA002621122A CA2621122A1 (en) | 2005-09-02 | 2006-08-25 | Distance measuring device and distance measuring method |
US11/991,384 US7932855B2 (en) | 2005-09-02 | 2006-08-25 | Distance measuring device and distance measuring method |
CN2006800383708A CN101288001B (zh) | 2005-09-02 | 2006-08-25 | 距离测定装置和距离测定方法 |
EP06783029A EP1930743A1 (en) | 2005-09-02 | 2006-08-25 | Distance measuring device and distance measuring method |
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JP2006054485A JP4293194B2 (ja) | 2005-09-02 | 2006-03-01 | 距離測定装置、及び距離測定方法 |
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US10677890B2 (en) | 2013-10-25 | 2020-06-09 | Texas Instruments Incorporated | Techniques for angle resolution in radar |
US11022675B2 (en) | 2013-10-25 | 2021-06-01 | Texas Instruments Incorporated | Techniques for angle resolution in radar |
US11747435B2 (en) | 2013-10-25 | 2023-09-05 | Texas Instruments Incorporated | Techniques for angle resolution in radar |
WO2016065178A1 (en) * | 2014-10-22 | 2016-04-28 | Texas Instruments Incorporated | Method to determine specific objects of interest in a radar |
US9753120B2 (en) | 2014-10-22 | 2017-09-05 | Texas Instruments Incorporated | Method to “zoom into” specific objects of interest in a radar |
RU2769565C1 (ru) * | 2021-05-08 | 2022-04-04 | Общество с ограниченной ответственностью "Генезис-Таврида" | Способ определения расстояний от измерительной станции до нескольких транспондеров |
Also Published As
Publication number | Publication date |
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JP4293194B2 (ja) | 2009-07-08 |
JP2007093576A (ja) | 2007-04-12 |
BRPI0615288A2 (pt) | 2016-09-13 |
CN101288001A (zh) | 2008-10-15 |
RU2008112680A (ru) | 2009-10-10 |
CN101288001B (zh) | 2013-03-06 |
RU2419813C2 (ru) | 2011-05-27 |
US7932855B2 (en) | 2011-04-26 |
KR20080039473A (ko) | 2008-05-07 |
EP1930743A1 (en) | 2008-06-11 |
CA2621122A1 (en) | 2007-03-15 |
US20090251360A1 (en) | 2009-10-08 |
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