CN203719733U - Continuous wave K-wave band radar coal bunker charge level indicator - Google Patents
Continuous wave K-wave band radar coal bunker charge level indicator Download PDFInfo
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- CN203719733U CN203719733U CN201320874389.3U CN201320874389U CN203719733U CN 203719733 U CN203719733 U CN 203719733U CN 201320874389 U CN201320874389 U CN 201320874389U CN 203719733 U CN203719733 U CN 203719733U
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Abstract
The utility model relates to a continuous wave K-wave band radar coal bunker charge level indicator which is applied to material level measurement in the coal bunker dust environment and water vapor large environment. The continuous wave K-wave band radar coal bunker charge level indicator has the technical scheme that the coal bunker charge level indicator comprises a control chamber, a radar body, a radar sensor and a radar antenna housing, wherein a liquid crystal display (LCD) is arranged in the control chamber; the control chamber is arranged on the top of the radar body; the coal bunker charge level indicator is characterized in that the radar body is internally provided with a universal joint; the radar antenna housing is arranged at the lower end of the radar body; the radar antenna housing comprises a radar antenna chamber and a wave beam guide device which are separated from each other by a low-loss isolator; the radar sensor is arranged in the radar antenna housing; the control chamber is internally provided with a signal conditioning module, a signal processing display, a communication module and an interface circuit with 4-20mA electric current loop. The continuous wave K-wave band radar coal bunker charge level indicator has the advantages that a radar antenna is designed in a disc way, and is capable of rotating at +/-45 degrees; a special algorithm is adopted for processing echo, so that the echo and intermediate obstruction can be eliminated hierarchically.
Description
Technical field
The utility model relates to a kind of coal bunker special radar set, relates in particular to a kind of continuous wave K band radar coal bunker level-sensing device.
Background technology
Along with the development of modern industrial technology and the widespread use of signal processing technology, Measurement accuracy to coal bunker height, intelligent, automatic management is had higher requirement, the function application of Radar Products is various, comprise: survey velocity to moving target, distinguish moving target direction, and be particularly useful for surveying the range information of static object or dynamic object, very special by this product aerial angle---position angle is consistent with elevation angle angle, when surveying, can more effectively avoid energy attenuation, be particularly suitable for doing thing position and level detection.Radar level gauge on market is of a great variety, but is actually used in the such particular surroundings of run coal bin: high humidity, and dust is large, the temperature difference is large, in condensation situation how, many Radar Products all can not be applicable to demand in this, for this reason, are badly in need of a special radar level gauge of design and solve this class problem.
Summary of the invention
The purpose of this utility model is to provide a kind of VS(Innosent VCO stereo) the radar coal bunker level-sensing device of K-wave band band VCO of series, be applied to the level gauging of coal bunker dust atmosphere and steam overall situation.
For achieving the above object, the technical solution adopted in the utility model is: a kind of continuous wave K band radar coal bunker level-sensing device, comprise control chamber, radar body, radar sensor, radome, be arranged on the liquid crystal display of controlling chamber, control chamber and be positioned at radar body top, it is characterized in that, radar body is built-in with universal joint, radome is positioned at radar body lower end, radome is by radar antenna chamber, form with wave beam guide, centre is cut apart by low-loss isolator, radar sensor is arranged in radome, the indoor signal condition module of putting of described control chamber, signal processes and displays, input keyboard, communication module and 4-20mA electric current loop interface circuit,
Described signal condition module comprises simulation amplification and filter circuit, triangular wave swept-frequency signal driving circuit, digital signal processing CPU;
Described radar sensor is provided with power supply lead wire, I passage Q passage lead-in wire and sweep signal input lead, described I passage Q passage lead-in wire amplifies and is connected with filter circuit with simulation, described sweep signal input lead is connected with triangular wave swept-frequency signal driving circuit, simulation amplification is connected with digital signal processing cpu circuit respectively with filter circuit, triangular wave swept-frequency signal driving circuit, described digital signal processing CPU is connected with 4-20mA electric current loop interface difference circuit with communication module, and communication module is connected with PLC, DCS with 4-20mA electric current loop interface and after connecting;
Described radar sensor is partly comprised of signal source part, mixing output and signal transmitting and receiving, and signal source partly comprises voltage controlled oscillator and pressure source, and mixing output comprises I passage Q passage and frequency mixer.
Continuous wave K band radar coal bunker level-sensing device according to described, is characterized in that, described radar body front and back end rotates within the scope of ± 45 degree by universal joint.
Continuous wave K band radar coal bunker level-sensing device according to described, is characterized in that, described radome is horn-like.
The utility model has the advantage of, radar antenna adopts disk design, can ± 45 degree turn to; Echo Processing is adopted to particular algorithm, can divide by different level rank, eliminate echo and middle shelter, the range finding of radar material level is 150 meters of height, than general radar, exceeds 100 meters; The most advanced design of Simulation of radar hardware using, design performance is consistent with software emulation performance, reaches intrinsically safe circuit requirement.
Accompanying drawing explanation
Fig. 1 is connection block diagram of the present utility model.
Fig. 2 is radar bulk junction composition of the present utility model.
Fig. 3 is simulation amplification of the present utility model and filter circuit.
Fig. 4 is triangular wave swept-frequency signal driving circuit of the present utility model.
Fig. 5 is digital signal processing CPU of the present utility model.
Fig. 6 is 4-20mA electric current loop interface of the present utility model.
Fig. 7 is communication module of the present utility model.
Fig. 8 radar sensor specific works principle.
Fig. 9 is filter freguency response figure.
Figure 10 is job menu item process flow diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
The utility model as shown in the figure, a kind of continuous wave K band radar coal bunker level-sensing device, comprise and control chamber 1, radar body 2, radar sensor 4, radome 5, be arranged on the liquid crystal display of controlling chamber, control chamber and be positioned at radar body top, it is characterized in that, radar body 2 is built-in with universal joint 3, radome 5 is positioned at radar body 2 lower ends, radome 5 consists of radar antenna chamber and wave beam guide, centre is cut apart by low-loss isolator, radar sensor 4 is arranged in radome, described control chamber 1 built-in signal conditioning module, signal processes and displays, input keyboard, communication module and 4-20mA electric current loop interface circuit,
Described signal condition module comprises simulation amplification and filter circuit, triangular wave swept-frequency signal driving circuit, digital signal processing CPU;
Described radar sensor is provided with power supply lead wire, I passage Q passage lead-in wire and sweep signal input lead, described I passage Q passage lead-in wire amplifies and is connected with filter circuit with simulation, described sweep signal input lead is connected with triangular wave swept-frequency signal driving circuit, simulation amplification is connected with digital signal processing cpu circuit respectively with filter circuit, triangular wave swept-frequency signal driving circuit, described digital signal processing CPU is connected with 4-20mA electric current loop interface difference circuit with communication module, and communication module is connected with PLC, DCS with 4-20mA electric current loop interface and after connecting;
Described radar sensor is partly comprised of signal source part, mixing output and signal transmitting and receiving, and signal source partly comprises voltage controlled oscillator and pressure source, and mixing output comprises I passage Q passage and frequency mixer.
Continuous wave K band radar coal bunker level-sensing device according to described, is characterized in that, described radar body 2 front and back ends rotate within the scope of ± 45 degree by universal joint 3.
Continuous wave K band radar coal bunker level-sensing device according to described, is characterized in that, described radome (5) is horn-like.
(1) principle of work
This radar level gauge adopts continuous wave radar, continuous coverage, calculate in real time, repeatedly verification, adopt Fourier transform and software design idea, signal is processed and first simulating signal is become to digital signal, then utilizes efficient digital signal processor (DSP:Digital Signal Processor) or computing machine to carry out digital signal processing to it.
(2) working method
1. radar sensor working method
This radar sensor, no matter radar works in FMCW Continuous Wave with frequency modulation pattern or CW able one communication pattern, all needs the Vtune of VCO voltage controlled oscillator to arrange.
In the application relevant to range finding, radar is generally operational in FMCW pattern, first needs to arrange modulation signal.It is sawtooth wave (static range finding) or triangular wave (dynamically find range and test the speed) that modulation signal waveform can be set simultaneously; Frequency modulation width is determined by the amplitude range of Vtune tuning voltage, chooses tuning curve Linear good a section (within the scope of 0.5～10V), can obtain corresponding frequency modulation width; Modulating frequency is relevant to detection range, and suggestion is no more than 1kHz.
Testing the speed and during discrimination objective direction of motion, radar is generally operational in CW pattern, now can be by Vtune unsettled or be made as Constant Direct Current value (as DC 0.5V), do not do modulation and use.
As shown in Figure 8, radar sensor specific works principle:
What by frequency of VCO voltage controlled oscillator output, be tra transmits, wherein go out through antenna transmission on a road, one tunnel is split into again in the frequency mixer of passage that two-way enters respectively I, Q place, and wherein the signal of Q passage also needed first the phase shift through 90 ° before mixing; Antenna reception to echoed signal also through frequency mixer, carry out mixing with the two paths of signals of real-time shunting respectively, finally obtain I, Q two-way output signal.
As shown in Figure 8, sensor circuit is mainly comprised of three parts: signal source part, mixing output and signal transmitting and receiving part.
Signal source part: in Fig. 8 shown in the first half.Comprise VCO voltage controlled oscillator and pressure source.
VCO voltage controlled oscillator: by regulating the amplitude of Vtune tuning voltage to control the frequency transmitting, realize FMCW mode of operation;
Pressure source: provide working sensor power supply ,+5V.
Mixing output: in Fig. 8 shown in the latter half.Mainly comprise I, Q two paths and frequency mixer.
Frequency mixer: synchronization transmits and receives signal mixing herein;
Signal transmitting and receiving part: dual-mode antenna unification is not only signal transmission path but also be target echo signal RX path.
2. modulation signal is set
Survey the distance of static target, static target is to the distance between sensor, and modulation signal adopts sawtooth wave.This is because interference is now mostly Doppler signal, and aspect interference free performance, saw wave modulator is better than triangular modulation.Select linear uphill slope curve or descending grade curve as the time correlation function of transmission frequency, and regularly repeat these ripples, to obtaining possible mean value.
Modulation amplitude: the range of adjustment of choosing one section of best definite Vtune of tuning curve neutral line degree.In theory, modulation amplitude maximum magnitude is 0.5V ~ 8V;
Modulating frequency: frequency modulating signal in theory maximum can not surpass 150kHz, but suggestion adopts the modulating frequency of 100 ~ 200Hz while surveying distant object (30 ~ 100m), adopts the modulating frequency of 500 ~ 1kHz while surveying close-in target (10 ~ 20m).
3. front-end module workflow
Set after modulation signal, each pin by sensor is connected it with relevant design circuit or work apparatus.Operation steps and workflow are as follows:
A) by the external 5V forward voltage of pin Vcc source, pin GND ground connection;
B) give pin Vtune access a modulation signal setting, the range of adjustment of definite Vtune is cut and is selected from good one section of tuning curve Linear;
C) by pin IF1(in-phase signal) and IF2(orthogonal signal) optical viewer of access observable signal waveform, for example oscillograph;
D) fixed target is placed in radar coverage, and keeps transfixion;
E) on oscillograph or other optical viewers, can be observed IF1(in-phase signal) and IF2(orthogonal signal) two paths of signals waveform.Wherein, IF1(in-phase signal) and IF2(orthogonal signal) all carry difference frequency signal D in two paths of signals, this difference frequency is relevant to target range information.
4. sensor back-end processing flow process
In rear end, IF1 or IF2 signal are carried out to analyzing and processing, all can obtain the range information of target, reference flowchart is as follows:
A) by pin IF1(in-phase signal) or IF2(orthogonal signal) access in Hi-pass filter, filter modulation signal and other interference and noise, signal is further amplified simultaneously.If modulating frequency is 100Hz, suggestion adopts the Hi-pass filter of 1KHz.Because IVS-167 module output terminal is without IF amplifier section, can be suitable select the wave filter with certain gain, but the entire gain of front-end module and wave filter had better not surpass 60dB.It is 60dB that Fig. 9 is a gain, the high-pass filter frequency response diagram that frequency is 1kHz.
B) filtered signal is sent into DSP treating apparatus after AD conversion, can analyze the range information that obtains target.
Wherein, the relation of static object distance R and difference frequency D please refer to following formula:
(3) precision is controlled
1. improve distance accuracy
In fact, distance accuracy is main relevant with back end signal treatment technology.Rear end adopts the technology such as pulse compression or improves FFT sampling number the distance accuracy in the time of all may improving range observation while sampling.
I range finding from
By formula (1) and (2), can be found out, while fixing all the other parameters, frequency modulation width Delta is larger, and detection range may be less.Difference frequency is processed meaningful, will be made frequency modulation speed equal difference frequency D, that is to say, scanning will generate a whole difference frequency cycle, and the now I range finding of definable is from Rmin.
Formula is as follows:
If distribute the 24GHz ISM frequency range that frequency modulation width is 250MHz, the i.e. I range finding of the range resolution that can calculate sensor by formula (3) is from being 0.6m.
Improve range resolution, reduce I range finding from, to increase frequency modulation width; If frequency modulation width is limited, range resolution is mainly determined by later stage signal processing technology.
(4) function menu design
Control panel is comprised of LED display, trademark and three control buttons.OK key is determine/Menu key, and ∧ key is upper directionkeys, and ∨ key is lower directionkeys.
1. parameter setting
When SDUAC powers on, pin OK key, after powering on, unclamp, enter start menu.Start menu is divided into two option entries: parameter setting and working procedure.
Enter after start menu, press upper and lower directionkeys and select parameter that entry is set, press OK key and enter parameter interface is set.Parameter arranges interface and is divided into 7 option entries: setting height(from bottom), setting angle, calibration factor 1, calibration factor 2,4mA calibration, I calibration factor and sensor.Pressing OK key is that entry is selected to adjust, and upper and lower directionkeys is the large and small adjustment of the current entry numerical value of selection.
Setting height(from bottom) defaults to 0.
Setting angle defaults to 0.
Calibration factor 1, calibration factor 2 default values are 1.In sensor entry, arrange after calibration, radar shows that data and current actual range regulate calibration factor 1, calibration factor 2 while still having gap.Truly actual range (being also the measurement demonstration data after radar calibration)=before proofreading and correct, radargrammetry shows data (being also the measurement demonstration data before radar calibration) * calibration factor.
4mA calibration defaults to closes.When being 4mA calibration mode when opening, at this pattern Imitating amount current signal, be 4mA, if not 4mA is wrong number, mistake is counted * I calibration factor=4Ma
The calibration factor of using when I calibration factor defaults to Isosorbide-5-Nitrae mA calibration.
Sensor default 62.This entry refers to difference on the frequency time lag of echo when echo is compared with transmitted wave.
2. master menu
Enter after start menu, by upper and lower directionkeys, select working procedure entry, press OK key and enter interface of main menu.Interface of main menu is divided into 4 option entries: real time data, system setting, echoed signal and communication setting.Entry is selected in up and down arrow keys adjustment, and OK key enters for confirming.
Enter real time data option entry, be shown as the measuring state of current radar: echo state, operation heartbeat, measured value, measurement current value.
The system of entering arranges entry, is shown as system parameter setting interface, is divided into 4 little entries: feed bin height, dead space volume, display mode and contrast.
Feed bin height is the current range of radar, for material height mode provides feed bin height parameter.
Dead space volume is between charge level and radar antenna, to approach the radar antenna one non-metering space of side, defaults to 0.
Display mode has living space and expects high two kinds of patterns.During for spatial model, radargrammetry displayed value is space length between charge level and radar antenna; Distance between measurement displayed value=feed bin height-charge level of radar and radar antenna during for material height mode.
Contrast is the setting of LED Display Contrast
Enter echoed signal entry, be shown as echoed signal interface is set, be divided into 3 little entries: echo strength, material change, spurious echo.
Echo strength is associated to the filtering strength of echoed signal with radar.The stronger echo strength of filtering strength is more weak, and vice versa.
Material changes: the material that current environment is set changes speed situation.
Spurious echo is the spurious echo producing owing to having barrier to exist between radar level gauge and material, can adjust spurious echo numerical value according to the distance between barrier and radar and reach the object that radar filters spurious echo, and be that data are accurate.
Entry communication arranges entry, is shown as communication setting interface, is divided into 3 little entries: communications protocol, address, baud rate
Communications protocol is divided local and is uploaded, and readable radar wave when local is available by modbus-Rtu transmission measurement value while uploading.
Address is the current modbus address of radar.
Baud rate is Configuration of baud rate.
Figure 10 is job menu item process flow diagram.
Embodiment recited above is described preferred implementation of the present utility model; not design of the present utility model and protection domain are limited; do not departing under the prerequisite of the utility model design concept; various modification and improvement that in this area, common engineering technical personnel make the technical solution of the utility model, all should fall into protection domain of the present utility model.
Claims (3)
1. a continuous wave K band radar coal bunker level-sensing device, comprise and control chamber (1), radar body (2), radar sensor (4), radome (5), be arranged on the liquid crystal display of controlling chamber, control chamber and be positioned at radar body top, it is characterized in that, radar body (2) is built-in with universal joint (3), radome (5) is positioned at radar body (2) lower end, radome (5) consists of radar antenna chamber and wave beam guide, centre is cut apart by low-loss isolator, radar sensor (4) is arranged in radome, described control chamber (1) built-in signal conditioning module, signal processes and displays, input keyboard, communication module and 4-20mA electric current loop interface circuit,
Described signal condition module comprises simulation amplification and filter circuit, triangular wave swept-frequency signal driving circuit, digital signal processing CPU;
Described radar sensor is provided with power supply lead wire, I passage Q passage lead-in wire and sweep signal input lead, described I passage Q passage lead-in wire amplifies and is connected with filter circuit with simulation, described sweep signal input lead is connected with triangular wave swept-frequency signal driving circuit, simulation amplification is connected with digital signal processing cpu circuit respectively with filter circuit, triangular wave swept-frequency signal driving circuit, described digital signal processing CPU is connected with 4-20mA electric current loop interface difference circuit with communication module, and communication module is connected with PLC, DCS with 4-20mA electric current loop interface and after connecting;
Described radar sensor is partly comprised of signal source part, mixing output and signal transmitting and receiving, and signal source partly comprises voltage controlled oscillator and pressure source, and mixing output comprises I passage Q passage and frequency mixer.
2. continuous wave K band radar coal bunker level-sensing device according to claim 1, is characterized in that, described radar body (2) front and back end rotates within the scope of ± 45 degree by universal joint (3).
3. continuous wave K band radar coal bunker level-sensing device according to claim 1, is characterized in that, described radome (5) is horn-like.
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| CN201320874389.3U CN203719733U (en) | 2013-12-30 | 2013-12-30 | Continuous wave K-wave band radar coal bunker charge level indicator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316136A (en) * | 2014-11-11 | 2015-01-28 | 宁夏嘉翔自控技术有限公司 | Material level system with radar level gauge for elevated feed bin |
| CN105675085A (en) * | 2014-11-21 | 2016-06-15 | 中国航空工业集团公司雷华电子技术研究所 | Frequency-modulated continuous-wave radar level gauge |
| CN107389153A (en) * | 2017-07-14 | 2017-11-24 | 九江精密测试技术研究所 | A kind of explosion-proof frequency modulated continuous wave radar level meter |
-
2013
- 2013-12-30 CN CN201320874389.3U patent/CN203719733U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316136A (en) * | 2014-11-11 | 2015-01-28 | 宁夏嘉翔自控技术有限公司 | Material level system with radar level gauge for elevated feed bin |
| CN105675085A (en) * | 2014-11-21 | 2016-06-15 | 中国航空工业集团公司雷华电子技术研究所 | Frequency-modulated continuous-wave radar level gauge |
| CN105675085B (en) * | 2014-11-21 | 2019-03-29 | 中国航空工业集团公司雷华电子技术研究所 | A kind of frequency modulated continuous wave radar liquidometer |
| CN107389153A (en) * | 2017-07-14 | 2017-11-24 | 九江精密测试技术研究所 | A kind of explosion-proof frequency modulated continuous wave radar level meter |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140716 Termination date: 20151230 |
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| EXPY | Termination of patent right or utility model |