CN209706907U - A kind of 24GHz frequency modulated continuous wave radar level meter - Google Patents
A kind of 24GHz frequency modulated continuous wave radar level meter Download PDFInfo
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- CN209706907U CN209706907U CN201920417151.5U CN201920417151U CN209706907U CN 209706907 U CN209706907 U CN 209706907U CN 201920417151 U CN201920417151 U CN 201920417151U CN 209706907 U CN209706907 U CN 209706907U
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Abstract
The utility model relates to radar range finding technical fields, disclose a kind of 24GHz frequency modulated continuous wave radar level meter, including 24GHz FM module, intermediate-freuqncy signal conditioning and sampling module, echo signal processing module and data disaply moudle, the 24GHz FM module, intermediate-freuqncy signal conditioning and sampling module, echo signal processing module and data disaply moudle are sequentially connected electrically；The utility model passes through the 24GHz FM module and echo signal processing module being equipped with, and has the characteristics that range measurement high resolution, high-precision, blind area is small, response is fast.
Description
Technical field
The utility model relates to radar range finding technical fields, and in particular to a kind of 24GHz frequency modulated continuous wave radar level meter.
Background technique
Industrial stokehold, factory automation implementation process in, can the height to material position carry out it is reliable and stable
It measures very crucial；Radar levelmeter rapid proliferation due to the characteristics of its is non-contact, measurement is accurate, easy maintenance.
The frequency of radar is higher, and wavelength is shorter, and required antenna size is smaller, and field angle is also smaller, is more suitable for canister
The measurement of body and fine-powder also has blind area small, feature with high accuracy；It is public according to the calculating of the distance resolution of fmcw radar
Formula: C/2B, modulating bandwidth B is bigger, and the resolution ratio of distance is higher；Currently, radar levelmeter in the market is largely pulse thunder
It reaches, frequency is generally 6GHz or 26GHz, and small blind area, high-acruracy survey and response time fast requirement is not achieved, can not be good
Meet industrial needs.
Utility model content
In view of this, the present invention provides a kind of 24GHz frequency modulated continuous wave radar level meters.
In order to solve the above-mentioned technical problem, the technical solution of the utility model is: a kind of 24GHz frequency modulated continuous wave radar object
Position meter, it is characterised in that: including 24GHz FM module, intermediate-freuqncy signal conditioning and sampling module, echo signal processing module sum number
According to display module；The 24GHz FM module is for generating difference frequency in-phase signal and difference frequency orthogonal signalling；The intermediate-freuqncy signal tune
Reason and sampling module are used to digitize the difference frequency in-phase signal and difference frequency orthogonal signalling that are produced by the 24GHz FM module
At intermediate frequency quadrature signal；The echo signal processing module is used for described by intermediate-freuqncy signal conditioning and sampling module generation
Target range value needed for frequency orthogonal signalling are obtained by digital simulation；The data disaply moudle is used for will be described by echo-signal
The target range value that processing module generates intuitively is presented to operator；The 24GHz FM module, intermediate-freuqncy signal conditioning and
Sampling module, echo signal processing module and data disaply moudle are sequentially connected electrically.
Preferably, the 24GHz FM module includes phaselocked loop, loop filter, voltage controlled oscillator, 2 frequency multipliers, 4 times
Frequency divider, transmission antenna, receiving antenna, low-noise amplifier, 90 ° of phase shifters, frequency mixer, the first power amplifier, the second function
Rate amplifier, the first frequency mixer and the second frequency mixer；The phaselocked loop is connect with loop filter, loop filter and voltage-controlled vibration
Device connection is swung, voltage controlled oscillator is connect with 4 times of frequency dividers and 2 frequency multipliers respectively；4 times of frequency dividers are connect with phaselocked loop；Institute
2 frequency multipliers are stated to connect with the first power amplifier and the second power amplifier respectively；First power amplifier and transmission day
Line connection, the second power amplifier are connect with the first frequency mixer and 90 ° of phase shifters respectively；First frequency mixer is put with low noise
Big device connection；90 ° of phase shifters are connect with the second frequency mixer, and the second frequency mixer is connect with low-noise amplifier；The low noise
Acoustic amplifier is also connect with transmission antenna.
Preferably, the intermediate-freuqncy signal conditioning and sampling module include third power amplifier, low-pass filter and modulus
Converter；The third power amplifier is connect with low-pass filter, and low-pass filter is also connect with analog-digital converter.
Preferably, the echo signal processing module includes complex fast Fourier conversion module, noise suppression module, threshold
It is worth curve generation module, spectrum evaluation module, wave crest fitting module and distance calculation module；The complex fast Fourier converts mould
Block is connect with noise suppression module, and noise suppression module is connect with threshold curve generation module, and threshold curve produces module and spectrum
Evaluation module connection, spectrum evaluation module are connect with wave crest fitting module, and wave crest fitting module is connect with distance calculation module.
Compared with the prior art, utility model has the advantages that
1, the utility model is by being equipped with 24GHz FM module, within a frequency modulation period, phaselocked loop, loop filter
The linear FM signal for generating 12.1GHz ~ 13.1GHz jointly with voltage controlled oscillator, by 2 frequency multipliers become 23.2GHz ~
The FM signal of the FM signal of 26.2GHz, 24GHz amplifies through the first power amplifier, is sent by transmission antenna；It receives
The echo-signal received is mixed by antenna with signal is sent, wherein it is same to generate difference frequency with transmission signal direct conversion all the way
Phase signals, another way are mixed with by the transmission signal after 90 ° of phase shifters, generate difference frequency orthogonal signalling；Transmission and received frequency
For rate from 23.2GHz linear change to 26.2GHz, bandwidth is up to 3GHz, and by formula C/2B, calculating its distance resolution be can reach
7.5 centimetres, range measurement high resolution has the characteristics that precision is high, response is fast.
2, the utility model uses the side of constant false alarm rate by being equipped with echo signal processing module, echo signal processing module
Method and moving average method generate threshold curve, enable blind area range be decreased to 2.5 centimetres, blind area is small, meets industry well
It needs.
Detailed description of the invention
Fig. 1 is that the system of the utility model forms figure；
Fig. 2 is the composition schematic diagram of 24GHz FM module；
Fig. 3 is the composition schematic diagram of intermediate-freuqncy signal conditioning and sampling module；
Fig. 4 is the composition schematic diagram of echo signal processing module；
Fig. 5 is the schematic diagram for generating threshold curve；
Fig. 6 is wave crest matched curve schematic diagram.
Appended drawing reference: 1,24GHz FM module；101, the first frequency mixer；102, the second frequency mixer；11, phaselocked loop；12,
Loop filter；13, voltage controlled oscillator；14,2 frequency multiplier；15,4 times of frequency dividers；16, transmission antenna；17, receiving antenna；18,
Low-noise amplifier；19,90 ° of phase shifters；2, intermediate-freuqncy signal conditioning and sampling module；21, low-pass filter；22, analog-to-digital conversion
Device；3, echo signal processing module；31, complex fast Fourier conversion module；32, noise suppression module；33, threshold curve is raw
At module；34, evaluation module is composed；35, wave crest fitting module；36, distance calculation module；4, data disaply moudle；51, the first function
Rate amplifier；52, the second power amplifier；53, third power amplifier.
Specific embodiment
Below in conjunction with attached drawing, specific embodiment of the present utility model is described in further detail, so that the utility model skill
Art scheme is more readily understood and grasps.
Embodiment: the present embodiment provides a kind of 24GHz frequency modulated continuous wave radar level meters described in referring to Fig.1~4, including
24GHz FM module 1, intermediate-freuqncy signal conditioning and sampling module 2, echo signal processing module 3 and data disaply moudle 4；24GHz
FM module 1 includes phaselocked loop 11, loop filter 12, voltage controlled oscillator 13,2 frequency multiplier, 14,4 times of frequency dividers 15, sends day
Line 16, receiving antenna 17,18,90 ° of phase shifters 19 of low-noise amplifier, frequency mixer, the first power amplifier 51, the second power are put
Big device 52, the first frequency mixer 101 and the second frequency mixer 102；Phaselocked loop 11 is connect with loop filter 12, loop filter 12 with
Voltage controlled oscillator 13 connects, and voltage controlled oscillator 13 is connect with 4 times of frequency multipliers of frequency divider 15 and 2 14 respectively；4 times of frequency dividers 15 and lock
Phase ring 11 connects；2 frequency multipliers 14 are connect with the first power amplifier 51 and the second power amplifier 52 respectively；First power amplification
Device 51 is connect with transmission antenna 16, and the second power amplifier 52 is connect with the first frequency mixer 101 and 90 ° phase shifter 19 respectively；The
One frequency mixer 101 is connect with low-noise amplifier 18；90 ° of phase shifters 19 are connect with the second frequency mixer 102, the second frequency mixer 102
It is connect with low-noise amplifier 18；Low-noise amplifier 18 is also connect with transmission antenna 16；24GHz FM module 1 is for generating
Difference frequency in-phase signal and difference frequency orthogonal signalling.
Intermediate-freuqncy signal conditioning and sampling module 2 include third power amplifier 53, low-pass filter 21 and analog-digital converter
22；Third power amplifier 53 is connect with low-pass filter 21, and low-pass filter 21 is also connect with analog-digital converter 22；Intermediate frequency letter
Number conditioning and sampling module 2 are for will the difference frequency in-phase signal that be produced by 24GHz FM module 1 and difference frequency orthogonal signalling number
It is melted into intermediate frequency quadrature signal.
Echo signal processing module 3 includes complex fast Fourier conversion module 31, noise suppression module 32, threshold curve
Generation module 33, spectrum evaluation module 34, wave crest fitting module 35 and distance calculation module 36；Complex fast Fourier conversion module
31 connect with noise suppression module 32, and noise suppression module 32 is connect with threshold curve generation module 33, and threshold curve produces mould
Block connect with spectrum evaluation module 34, and spectrum evaluation module 34 is connect with wave crest fitting module 35, wave crest fitting module 35 and apart from meter
Module 36 is calculated to connect；Echo signal processing module 3 is used to believe the intermediate frequency quadrature generated by intermediate-freuqncy signal conditioning and sampling module 2
Target range value needed for number being obtained by digital simulation.
Data disaply moudle 4 is used to the target range value generated by echo signal processing module 3 being intuitively presented to behaviour
Make personnel.
24GHz FM module 1, intermediate-freuqncy signal conditioning and sampling module 2, echo signal processing module 3 and data show mould
Block 4 is sequentially connected electrically.
When work, in 24GHz FM module 1, set phaselocked loop 11 within a frequency modulation period, linear convergent rate
Frequency between 3.025GHz to 3.275GHz；Frequency modulation is carried out, the pulse current that phaselocked loop 11 exports passes through loop filter 12,
The voltage of linear increase is generated, which passes through the frequency of oscillation that voltage controlled oscillator 13 generates linear change, the oscillation again
The range of frequency is between 12.1GHz to 13.1GHz；Divided output frequency two-way is vibrated, wherein passing through 4 times of frequency dividers 15 all the way
Afterwards, the frequency between 3.025GHz to 3.275GHz is generated, then in feed back input to phaselocked loop 11；Another way passes through 2 frequency multipliers
14, the output frequency generated between 24GHz to 26GHz obtains final transmission signal using the first power amplifier 51,
The transmission signal is sent by transmission antenna 16；Receiving antenna 17 receives the transmission signal issued by transmission antenna 16, should
Signal is sent after the amplification of low-noise amplifier 18, is inputted in the first frequency mixer 101, at this point, the first frequency mixer 101 is also connected with
All the way input by the second power amplifier 52 amplification after frequency signal, it is defeated after above two signal is mixed
Difference frequency signal in the same direction out；The another output of second power amplifier 52 after 90 ° of 19 phase shifts of phase shifter, generate with through too low
The amplified frequency signal for sending signal in orthogonal of noise amplifier 18, the signal input in the second frequency mixer 102 and through too low
The amplified transmission signal of noise amplifier 18 is mixed, and difference frequency orthogonal signalling are exported.
The difference frequency exported by 24GHz FM module 1 signal in the same direction and difference frequency orthogonal signalling input intermediate-freuqncy signal are improved and are adopted
In egf block 2, in intermediate-freuqncy signal conditioning and sampling module 2, difference frequency signal in the same direction and difference frequency orthogonal signalling pass through third power
The amplification of amplifier 53, then be input in low-pass filter 21 and be filtered, it is finally sampled, is obtained with analog-digital converter 22
Intermediate frequency quadrature signal after digitlization.
In the intermediate frequency quadrature signal input echo signal processing module 3 exported by intermediate-freuqncy signal conditioning and sampling module 2；This
In embodiment, echo signal processing module 3 is replaced using in the prior art with DSP signal processor；By intermediate-freuqncy signal
Conditioning and sampling module 2 export digitized after intermediate frequency quadrature signal carry out echo signal processing module 3 in, by plural number
The processing of fast Fourier transform module 31 is converted into frequency spectrum from time-domain signal；The frequency spectrum enters in noise suppression module 32, makes an uproar
Sound suppression module 32 is averaged to multiple frequency spectrum, inhibits random noise, improves signal-to-noise ratio；Threshold curve generation module 33
Threshold curve is dynamically generated according to frequency spectrum；In the present embodiment, the algorithm that threshold curve generation module 33 generates threshold curve is as follows
Described, referring to Fig. 5, there are an echo very close to transmitted wave for wave frequency curve, first use filter width W2 to wave frequency curve into
Row moving average filter, obtains smoothed curve 2, You Tuke be clearly visible smoothed curve 2 cannot effectively differentiate cut transmitted wave and
Echo obtains smoothed curve 1, then will put down so carrying out moving average filter to wave frequency curve with smaller filter width W1 again
Sliding curve 1 is combined with smoothed curve 2, can obtain final threshold curve；The threshold generated by threshold curve generation module 33
Value curve can effectively be partitioned into the echo close to transmitted wave, reduce the blind area of measurement；Threshold curve can cut wave frequency curve
Multiple echoes are cut out, wherein there is the echo of measuring distance of target, also there is the echo of fixed obstacle；Power estimation module is according to the energy of echo
Size is measured to assess echo, the maximum echo of energy inputs the target echo in wave crest fitting module 35 as target echo,
Wave crest fitting module 35 carries out curve fitting, and finds the highest point of wave crest；In the present embodiment, the algorithm of wave crest fitting module 35 is such as
It is lower described, referring to Fig. 6, inputs ridge curves irregular in wave crest fitting module 35 and pass through curve matching, obtain matched curve,
The matched curve has a highest point, using this highest point as the corresponding target frequency point number W3 of target range；Mould is fitted by wave crest
The wave crest that block 35 obtains can reflect the average case of target level, improve accuracy.It is obtained by wave crest fitting module 35
Target frequency point number W3 target and radar can be obtained by the calculating of distance calculation module 36 by distance calculation module 36
The distance between level meter.
By echo signal processing module 3 export in value signal input data display module 4, data disaply moudle 4
The data apart from value signal are intuitively presented to operator, facilitate the use of operator.
In the description of the present invention, it should be understood that term " coaxial ", " bottom ", " one end ", " top ", " in
The orientation of the instructions such as portion ", " other end ", "upper", " side ", " top ", "inner", " front ", " center ", " both ends " or position are closed
System is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of describing the present invention and simplifying the description, rather than
The device or element of indication or suggestion meaning must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot
It is construed as a limitation of the present invention.
In the present invention unless specifically defined or limited otherwise, term " installation ", " setting ", " connection ", " Gu
Calmly ", the terms such as " being screwed on " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；
It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, can also indirectly connected through an intermediary, it can be with
It is the interaction relationship of the connection or two elements inside two elements, unless otherwise restricted clearly, for this field
For those of ordinary skill, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
The representative instance of above only the utility model, in addition to this, the utility model can also have other a variety of specific
Embodiment, all technical solutions formed using equivalent substitution or equivalent transformation, all falls within the model of the requires of the utility model protection
Within enclosing.
Claims (4)
1. a kind of 24GHz frequency modulated continuous wave radar level meter, it is characterised in that: improved including 24GHz FM module, intermediate-freuqncy signal
And sampling module, echo signal processing module and data disaply moudle；
The 24GHz FM module is for generating difference frequency in-phase signal and difference frequency orthogonal signalling；
Difference frequency in-phase signal for that will be produced by the 24GHz FM module of intermediate-freuqncy signal conditioning and sampling module and
Difference frequency orthogonal signalling are digitized into intermediate frequency quadrature signal；
The echo signal processing module is used for the intermediate frequency quadrature signal generated by intermediate-freuqncy signal conditioning and sampling module
Target range value needed for being obtained by digital simulation；
The data disaply moudle is for the target range value generated by echo signal processing module to be intuitively presented to
Operator；
The 24GHz FM module, intermediate-freuqncy signal conditioning and sampling module, echo signal processing module and data disaply moudle according to
Secondary electrical connection.
2. a kind of 24GHz frequency modulated continuous wave radar level meter according to claim 1, it is characterised in that: the 24GHz tune
Frequency module includes phaselocked loop, loop filter, voltage controlled oscillator, 2 frequency multipliers, 4 times of frequency dividers, transmission antenna, receiving antenna, low
Noise amplifier, 90 ° of phase shifters, frequency mixer, the first power amplifier, the second power amplifier, the first frequency mixer and second are mixed
Frequency device；The phaselocked loop is connect with loop filter, and loop filter is connect with voltage controlled oscillator, and voltage controlled oscillator is respectively with 4
Times frequency divider and the connection of 2 frequency multipliers；4 times of frequency dividers are connect with phaselocked loop；2 frequency multiplier respectively with the first power amplification
Device and the connection of the second power amplifier；First power amplifier is connect with transmission antenna, the second power amplifier respectively with
First frequency mixer and 90 ° of phase shifter connections；First frequency mixer is connect with low-noise amplifier；90 ° of phase shifters and
The connection of two frequency mixers, the second frequency mixer are connect with low-noise amplifier；The low-noise amplifier is also connect with transmission antenna.
3. a kind of 24GHz frequency modulated continuous wave radar level meter according to claim 1, it is characterised in that: the intermediate frequency letter
Number conditioning and sampling module include third power amplifier, low-pass filter and analog-digital converter；The third power amplifier
It is connect with low-pass filter, low-pass filter is also connect with analog-digital converter.
4. a kind of 24GHz frequency modulated continuous wave radar level meter according to claim 1, it is characterised in that: the echo letter
Number processing module includes complex fast Fourier conversion module, noise suppression module, threshold curve generation module, spectrum assessment mould
Block, wave crest fitting module and distance calculation module；The complex fast Fourier conversion module is connect with noise suppression module, is made an uproar
Sound suppression module is connect with threshold curve generation module, and threshold curve generation module is connect with spectrum evaluation module, composes evaluation module
It is connect with wave crest fitting module, wave crest fitting module is connect with distance calculation module.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113261925A (en) * | 2021-03-11 | 2021-08-17 | 山东师范大学 | Human body sensing method and system based on millimeter wave radar |
| CN116500609A (en) * | 2023-05-16 | 2023-07-28 | 北京锐达仪表有限公司 | Composite microwave radar measurement system for detecting blanking state and material level fluctuation state |
-
2019
- 2019-03-29 CN CN201920417151.5U patent/CN209706907U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113261925A (en) * | 2021-03-11 | 2021-08-17 | 山东师范大学 | Human body sensing method and system based on millimeter wave radar |
| CN116500609A (en) * | 2023-05-16 | 2023-07-28 | 北京锐达仪表有限公司 | Composite microwave radar measurement system for detecting blanking state and material level fluctuation state |
| CN116500609B (en) * | 2023-05-16 | 2023-11-21 | 北京锐达仪表有限公司 | Composite microwave radar measurement system for detecting blanking state and material level fluctuation state |
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