CN107870328A - A kind of multiple target traffic radar - Google Patents
A kind of multiple target traffic radar Download PDFInfo
- Publication number
- CN107870328A CN107870328A CN201711260803.0A CN201711260803A CN107870328A CN 107870328 A CN107870328 A CN 107870328A CN 201711260803 A CN201711260803 A CN 201711260803A CN 107870328 A CN107870328 A CN 107870328A
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- 230000003321 amplification Effects 0.000 claims abstract description 37
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 37
- 230000010355 oscillation Effects 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- G01S13/88—Radar or analogous systems specially adapted for specific applications
-
- 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
-
- 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
- G01S13/50—Systems of measurement based on relative movement of target
- G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
- G01S13/589—Velocity or trajectory determination systems; Sense-of-movement determination systems measuring the velocity vector
-
- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The present invention discloses a kind of multiple target traffic radar, including：Modulation signal generator forms CW with frequency modulation；Power amplifier module is connected with modulation signal generator and transmitting antenna respectively, and for carrying out power amplifier to FM signal, the signal after power amplifier is transmitted by transmitting antenna；Reception antenna is connected with frequency mixer, is sent for receiving the feedback signal of target to be measured, and by feedback signal to frequency mixer；Frequency mixer is connected with modulation signal generator and filter and amplification module respectively, for feedback signal and FM signal to be mixed, so as to obtain the difference frequency signal of feedback signal and FM signal；Digital signal processor is used to parse difference frequency signal, obtains the distance, speed and azimuth information of target to be measured.Multiple target traffic radar provided by the invention can realize that radar beam scope can cover multiple tracks, so as to realize that multiple target monitors, reduce the cost for measuring multiple target in the prior art.
Description
Technical field
The present invention relates to velocity measuring technique field, more particularly to a kind of multiple target traffic radar.
Background technology
With the development of modern science and technology, the improvement of people's living standards, the popularity rate of vehicle more and more higher.Meanwhile it is
Satisfaction is with car safety, requirement more and more higher to radar.
The operation principle of traditional Doppler's multiple target traffic radar is that the radial velocity of target vehicle is measured, and is led to
Estimation is crossed by Doppler frequency shift caused by relative distance changes between target vehicle and radar antenna phase center (APC) be present
Amount realizes speed measuring function.
Based on this, it was found by the inventors of the present invention that in the prior art, a usual radar can only measure a track vehicle
Speed and spacing, realize that multilane measurement needs to set multiple radars, cost is high.
The content of the invention
The present invention provides a kind of multiple target traffic radar, realizes that multilane measurement needs setting more in the prior art to overcome
The high technical problem of individual radar cost.
The present invention provides a kind of multiple target traffic radar, including：Modulation signal generator, power amplifier module, transmitting antenna, connect
Receive antenna, frequency mixer, filter and amplification module and digital signal processor；The modulation signal generator is used to be continuously produced in
FM signal in the range of predeterminated frequency, form CW with frequency modulation；The power amplifier module respectively with the modulation signal generator
And transmitting antenna is connected, for carrying out power amplifier to the FM signal, the signal after power amplifier is carried out by transmitting antenna
Send；The reception antenna is connected with the frequency mixer, for receiving the feedback signal of target to be measured, and by the feedback letter
Number send to the frequency mixer；The frequency mixer is connected with the modulation signal generator and filter and amplification module respectively,
For the feedback signal and FM signal to be mixed, so as to obtain the difference frequency signal of feedback signal and FM signal；
The filter and amplification module is connected with the digital signal processor, and enhanced processing is filtered to the difference frequency signal, will
Difference frequency signal after the filter and amplification is sent to the digital signal processor；The digital signal processor is used for described
Difference frequency signal after filter and amplification is parsed, and obtains the distance, speed and azimuth information of target to be measured.
In a kind of possible implementation, the modulation signal generator includes voltage controlled oscillator VCO, phase-locked loop circuit
PLL and modulator；The PLL is connected with VCO respectively with modulator, and the PLL is believed local oscillator caused by VCO with modulator
Number it is modulated.
In a kind of possible implementation, the multiple target traffic radar also includes circulator；Circulator respectively with institute
State power amplifier module, the modulation signal generator and frequency mixer to be connected, for FM signal to be divided into two paths of signals, respectively
Send to the power amplifier module and frequency mixer.
In a kind of possible implementation, the multiple target traffic radar also includes：Low-noise amplification circuit, the low noise
Amplifying circuit is connected with reception antenna and frequency mixer respectively, for carrying out low noise amplification to the feedback signal received, and
Signal after low noise is amplified is transmitted to the frequency mixer.
In a kind of possible implementation, the filter and amplification module includes：Filter circuit and IF amplifier circuit；
The filter circuit is connected with the frequency mixer, for being filtered processing to the difference frequency signal；IF amplifier circuit with
The filter circuit is connected, for the filtered difference frequency signal is carried out into intermediate frequency amplification, and after intermediate frequency is amplified
Signal is sent to digital signal processor.
In a kind of possible implementation, the circulator includes power splitter or coupler.
Multiple target traffic radar provided by the invention, predeterminated frequency scope is continuously produced in by modulation signal generator 1
Interior FM signal, CW with frequency modulation FMCW is formed, is launched CW with frequency modulation by transmitting antenna 3, reception antenna 4 connects
The feedback signal of target reflection to be measured is received, the feedback signal and FM signal are mixed by frequency mixer 5, obtain feedback letter
Difference frequency signal number with FM signal；Digital signal processor 7 parses to the difference frequency signal after the filter and amplification, obtains
Distance, speed and the azimuth information of target to be measured, it is possible to achieve radar beam scope can cover multiple tracks, so as to
Realize that multiple target monitors, reduce the cost for measuring multiple target in the prior art.
Brief description of the drawings
Fig. 1 is the structural representation for the multiple target traffic radar that the embodiment of the present invention one provides；
Fig. 2 is the structural representation for the multiple target traffic radar that the embodiment of the present invention two provides.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Embodiment one
Fig. 1 is the structural representation for the multiple target traffic radar that the embodiment of the present invention one provides, as shown in figure 1, this implementation
Multiple target traffic radar in example, including：Modulation signal generator 1, power amplifier module 2, transmitting antenna 3, reception antenna 4, mixing
Device 5, filter and amplification module 6, digital signal processor 7.
Modulation signal generator 1, for the FM signal being continuously produced in the range of predeterminated frequency, form CW with frequency modulation
FMCW。
Specifically, modulation signal generator 1 produces required CW with frequency modulation signal, that is, being formed has one to set the tone
The FM signal f+ △ f1 of rule processed.
Power amplifier module 2, the power amplifier module 2 are connected with the modulation signal generator 1 and transmitting antenna 3 respectively,
For carrying out power amplifier to the FM signal, the signal after power amplifier is transmitted by transmitting antenna 3.
Reception antenna 4, the reception antenna 4 is connected with the frequency mixer 5, for receiving the feedback letter of target to be measured
Number, and the feedback signal is sent to the frequency mixer 5；
Frequency mixer 5 is connected with modulation signal generator 1 and filter and amplification module 6 respectively, for by the feedback letter
Number and FM signal be mixed, so as to obtain the difference frequency signal of feedback signal and FM signal；
Filter and amplification module 6 is connected with the digital signal processor 7, and the difference frequency signal is filtered at amplification
Reason, the digital signal processor 7 is sent to by the difference frequency signal after the filter and amplification；
Digital signal processor 7 parses to the difference frequency signal after the filter and amplification, obtain target to be measured distance,
Speed and azimuth information.
It should be noted that digital signal processor 7 can use conventional ARM chips or DSP etc., can also use
Chip microcontroller.
Specifically, what is launched in the present embodiment is CW with frequency modulation.When multiple target traffic radar works, modulated signal occurs
Device 1 produces the FM signal f+ △ f1 with certain modulation rule, forms CW with frequency modulation, FM signal is radiated sky by antenna
Between.When transmission signal runs into target to be measured, part energy is reflected back, and receives to form feedback letter by reception antenna
Number, antenna receives the feedback signal of target, and now the frequency of feedback signal is f+ △ f1.Antenna and mesh are travelled to and fro between in electromagnetic wave
In target this period, local oscillation signal i.e. FM signal modulate rule after elapsed time △ t, by it and have been changed to f+ △
F2, feedback signal and the local oscillation signal from modulation signal generator 1 are mixed, intermediate frequency letter is obtained in mixer output
Number, also be afraid of signal or difference frequency signal for difference.The frequency of this difference frequency signal includes the information of target range and speed.That is difference frequency
Signal 2f+ △ f1+ △ f2 and △ f1- △ f2, wherein △ f1- △ f2 carry the relevant information of target.Difference frequency signal is subjected to DSP
The relevant informations such as target range are can obtain after processing.
Wherein, the digital signal processor 7 parses to the difference frequency signal after the filter and amplification, obtains mesh to be measured
Target distance, speed and azimuth information difference frequency signal, including：It is changed into data signal after ADC is gathered and is sent into data signal
Processor 7, then by digital signal processor 7 be calculated difference frequency signal characteristic (including signal frequency, phase etc. believe
Breath), with reference to modulation rule, then obtain target information to be measured (including target range, speed, orientation etc.).
Thus, the FM signal in the range of predeterminated frequency is continuously produced in by modulation signal generator 1, forms frequency modulation and connect
Continuous ripple FMCW, is launched CW with frequency modulation by transmitting antenna 3, and reception antenna 4 receives the feedback letter of target reflection to be measured
Number, the feedback signal and FM signal are mixed by frequency mixer 5, and the difference frequency for obtaining feedback signal and FM signal is believed
Number；Digital signal processor 7 parses to the difference frequency signal after the filter and amplification, obtains distance, the speed of target to be measured
And azimuth information, it is possible to achieve radar beam scope can cover multiple tracks, so as to realize that multiple target monitors, reduce
The cost of multiple target is measured in the prior art.
The multiple target traffic radar that the present embodiment provides also has the characteristics of peak power is low and working frequency is wide；During echo
Prolong and be much smaller than transmitted signal bandwidth, and transmission signal is carried out simultaneously with receiving echo-signal, in the absence of blind range zone；Have
Good ECCM (electronic countermeasure) and LPI (low intercepting and capturing rate) performance.
Embodiment two
Fig. 2 is the structural representation for the multiple target traffic radar that the embodiment of the present invention two provides, as shown in Fig. 2 this implementation
Example is further limited the multiple target traffic radar in embodiment one.
In the present embodiment, the modulation signal generator 1 include voltage controlled oscillator VCO 11, phase-locked loop circuit PLL12 and
Modulator 13；The PLL12 is connected with VCO11 respectively with modulator 13, and the PLL12 produces with modulator 13 to VCO11
Local oscillation signal be modulated.
Specifically, modulator 13 produces the modulated signal of certain waveform, and voltage controlled oscillator VCO 11 is produced together with PLL12
Raw local oscillation signal is modulated, and produces FM signal.PLL ensure that the frequency modulation line of caused modulation continuous wave with modulator
Property degree, fm linearity is higher, and caused CW with frequency modulation is higher closer to required ideal signal, its measurement accuracy.
Further, the multiple target traffic radar also includes circulator 8；Circulator 8 respectively with the power amplifier module 2,
The modulation signal generator 1 and frequency mixer 5 are connected, and for FM signal to be divided into two paths of signals, are respectively sent to institute
State power amplifier module 2 and frequency mixer 5.
Wherein, circulator 8 can include power splitter or coupler.
Further, the multiple target traffic radar also includes：Low-noise amplification circuit 9.The low-noise amplification circuit 9 is distinguished
It is connected with reception antenna 4 and frequency mixer 5, for carrying out low noise amplification to the feedback signal received, and low noise is amplified
Signal afterwards is transmitted to the frequency mixer 5.
Further, the filter and amplification module 6 includes：Filter circuit 61 and IF amplifier circuit 62.
The filter circuit 61 is connected with the frequency mixer 5, for being filtered processing to the difference frequency signal；
IF amplifier circuit 62 is connected with the filter circuit 61, for the filtered difference frequency signal is carried out
Intermediate frequency amplifies, and the signal after intermediate frequency is amplified carry out analog-to-digital conversion after be sent to digital signal processor 7.
When radar system carries out normal work, by VCO11, PLL12 and the collective effect of modulator 13, required for producing
CW with frequency modulation signal, now FM signal f+ △ f1.Caused FM signal is divided into two-way, wherein radiofrequency signal passes through all the way
After crossing circulator 8, launched by transmitting antenna 3, and another way signal is sent into frequency mixer 5.The CW with frequency modulation of transmitting runs into
Reflect after target, received by reception antenna 4, the frequency of feedback signal is f+ △ f1.It is emitted in CW with frequency modulation
Antenna 3 was sent in this period of the reception of reception antenna 4, and the CW with frequency modulation signal of transmitting is according to modulating rule
Some changes, modulate rule by it and have been changed to f+ △ f2.Reception signal and local oscillation signal now through low-noise amplification circuit 9
(transmission signal at this moment) is mixed, so as to obtain the difference frequency signal of reception signal and local oscillation signal.That is difference frequency signal 2f+
△ f1+ △ f2 and △ f1- △ f2, wherein △ f1- △ f2 carry the relevant information of target.
This difference frequency signal contains the information of target to be measured, carry the difference frequency signal of target information according to different targets,
Different modulation rule etc., show different characteristics.Circuit 61 filters out out-of-band noise to difference frequency signal after filtering, through intermediate frequency
Amplifying circuit 62 is amplified to the collectable scopes of ADC, is changed into data signal after ADC is gathered and is sent into Digital Signal Processing
Device 7, the characteristic (including the information such as signal frequency, phase) of difference frequency signal is then calculated by digital signal processor 7, ties
Modulation rule is closed, then obtains target information to be measured (including target range, speed, orientation etc.).
Thus, local oscillation signal caused by VCO11 is modulated with modulator 13 by PLL12, forms CW with frequency modulation
FMCW；Circulator 8 is used to FM signal being divided into two paths of signals, is respectively sent to the power amplifier module 2 and frequency mixer 5；Institute
State low-noise amplification circuit 9 and low noise amplification is carried out to feedback signal, and the signal after low noise is amplified is transmitted to the frequency mixer 5；
The filter circuit 61 is filtered processing to the difference frequency signal；IF amplifier circuit 62 is to the filtered difference frequency is believed
Number carry out intermediate frequency amplification, and the signal after intermediate frequency is amplified carry out analog-to-digital conversion after be sent to digital signal processor 7, Ke Yishi
Existing radar beam scope can cover multiple tracks, and so as to realize that multiple target monitors, it is more to reduce measurement in the prior art
The cost of target.
The multiple target traffic radar that the present embodiment provides also has the characteristics of peak power is low and working frequency is wide；During echo
Prolong and be much smaller than transmitted signal bandwidth, and transmission signal is carried out simultaneously with receiving echo-signal, in the absence of blind range zone；Have
Good ECCM (electronic countermeasure) and LPI (low intercepting and capturing rate) performance.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (6)
- A kind of 1. multiple target traffic radar, it is characterised in that including：Modulation signal generator, power amplifier module, transmitting antenna, connect Receive antenna, frequency mixer, filter and amplification module and digital signal processor；The modulation signal generator is used to be continuously produced in the FM signal in the range of predeterminated frequency, forms CW with frequency modulation；The power amplifier module is connected with the modulation signal generator and transmitting antenna respectively, for the FM signal Power amplifier is carried out, the signal after power amplifier is transmitted by transmitting antenna；The reception antenna is connected with the frequency mixer, for receiving the feedback signal of target to be measured, and by the feedback letter Number send to the frequency mixer；The frequency mixer is connected with the modulation signal generator and filter and amplification module 6 respectively, for by the feedback Signal and FM signal are mixed, so as to obtain the difference frequency signal of feedback signal and FM signal；The filter and amplification module is connected with the digital signal processor, and the difference frequency signal is filtered at amplification Reason, the digital signal processor is sent to by the difference frequency signal after the filter and amplification；The digital signal processor be used for the difference frequency signal after the filter and amplification is parsed, obtain target to be measured away from From, speed and azimuth information.
- 2. multiple target traffic radar according to claim 1, it is characterised in that the modulation signal generator includes voltage-controlled Oscillator VCO, phase-locked loop circuit PLL and modulator；The PLL is connected with VCO respectively with modulator, and the PLL adjusts with modulator to local oscillation signal caused by VCO System.
- 3. multiple target traffic radar according to claim 1, it is characterised in that the multiple target traffic radar also includes ring Shape device；Circulator is connected with the power amplifier module, the modulation signal generator and frequency mixer respectively, for frequency modulation to be believed Number it is divided into two paths of signals, is respectively sent to the power amplifier module and frequency mixer.
- 4. multiple target traffic radar according to claim 1, it is characterised in that the multiple target traffic radar also includes：Low-noise amplification circuit, the low-noise amplification circuit is connected with reception antenna and frequency mixer respectively, for receiving Feedback signal carry out low noise amplification, and the signal after low noise is amplified is transmitted to the frequency mixer.
- 5. multiple target traffic radar according to claim 1, it is characterised in that the filter and amplification module includes：Filtering Circuit and IF amplifier circuit；The filter circuit is connected with the frequency mixer, for being filtered processing to the difference frequency signal；IF amplifier circuit is connected with the filter circuit, for being put to the filtered difference frequency signal is carried out into intermediate frequency Greatly, the signal after and intermediate frequency is amplified is sent to digital signal processor.
- 6. multiple target traffic radar according to claim 3, it is characterised in that the circulator includes power splitter or coupling Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711260803.0A CN107870328A (en) | 2017-12-04 | 2017-12-04 | A kind of multiple target traffic radar |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711260803.0A CN107870328A (en) | 2017-12-04 | 2017-12-04 | A kind of multiple target traffic radar |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110567556A (en) * | 2019-10-30 | 2019-12-13 | 北京锐达仪表有限公司 | Frequency modulation continuous wave radar level meter for measuring material level in container |
| CN110824476A (en) * | 2019-08-26 | 2020-02-21 | 惠州市德赛西威汽车电子股份有限公司 | Automobile detection method with dynamically adjustable detection range and radar system |
| CN113433540A (en) * | 2021-06-16 | 2021-09-24 | 中山大学 | Phase difference detection equipment for FMCW modulation |
| CN114578338A (en) * | 2022-05-05 | 2022-06-03 | 南京隼眼电子科技有限公司 | Radar device |
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| CN207571301U (en) * | 2017-12-04 | 2018-07-03 | 广西脉吾科技有限责任公司 | A kind of multiple target traffic radar |
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Application publication date: 20180403 |