CN202382811U - Wireless remote transmission frequency-modulated radar digital level meter - Google Patents
Wireless remote transmission frequency-modulated radar digital level meter Download PDFInfo
- Publication number
- CN202382811U CN202382811U CN2011204761944U CN201120476194U CN202382811U CN 202382811 U CN202382811 U CN 202382811U CN 2011204761944 U CN2011204761944 U CN 2011204761944U CN 201120476194 U CN201120476194 U CN 201120476194U CN 202382811 U CN202382811 U CN 202382811U
- Authority
- CN
- China
- Prior art keywords
- remote transmission
- linear
- signal
- digital
- wireless remote
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Radar Systems Or Details Thereof (AREA)
Abstract
The utility model discloses a wireless remote transmission frequency-modulated radar digital level meter, which comprises a linear frequency modulation signal producing module, signals produced by the linear frequency modulation signal producing module are divided into two channels of signals through a power divider, one channel of signals are connected with an antenna in a coupling mode through a circulator, the other channel of signals and output signals of the circulator are both transmitted to a lower frequency converter, intermediate frequency signals which are mixed through the lower frequency converter are connected with a preamplifier through a filter, output signals of the preamplifier are transmitted to a digital processing and logic controlling unit through analog-to-digital conversion, and the digital processing and logic controlling unit is connected with a general packet radio service (GPRS) remote transmission data module through a universal asynchronous receiver/transmitter (UART). The problems that existing signal sources are low in frequency modulation linearity and working frequency range, narrow in frequency modulation bandwidth, high in phase noise and low in frequency modulation rate are solved through the linear frequency modulation signal producing module, and data remote transmission and out-of-band maintenance of the level meter are achieved through the GPRS remote transmission data module.
Description
Technical field
The utility model relates to a kind of article position measuring device, especially a kind of wireless remote transmission frequency modulated(FM) radar digital level meter.
Background technology
The frequency modulation radar body place meter belongs to the industrial process automation instrument; This level meter is because measuring accuracy is high; Maintenance is few, and is easy for installation, widely applicable (can be used for that bulk, graininess, powdery are solid-state, the level gauging of level gauging and various liquid); Measure and do not receive numerous advantages such as temperature, pressure, foam, steam, dielectric property influence, more and more come extensively in sector applications such as oil, chemical industry, water conservancy, metallurgy, electric power, building materials.
Frequency modulation radar body place meter theoretical limit range resolution depends on system signal bandwidth and phase resolution:, wherein C represents the light velocity, represents phase resolution, and B represents modulating bandwidth.B is 1.5GHz, when being 1 °, is about 0.2mm, and promptly measuring accuracy can reach 0.2mm.This is to be based upon under linear, the desirable fully situation of system, has various factors in the actual application and causes that range resolution reduces, and wherein topmost factor is that frequency modulation is non-linear.
The two kinds of methods that have of linear FM radar ripple signal source can realize analogue technique and digital technology.Analogue technique mainly utilizes sweep voltage that voltage controlled oscillator is modulated, because in itself non-linear of VCO, when adopting linear voltage to carry out frequency modulation (PFM), the frequency signal of VCO output is actually nonlinear.Non-linear in order to eliminate, must carry out linear compensation, correcting mode commonly used is closed-loop corrected; Frequency or phase place through real-time measurement high-frequency microwave signal; Adopt the method for iterative computation to proofread and correct, though correction accuracy is high, owing to need to measure the frequency and the phase place of high-frequency microwave signal; Hardware cost is high, system complex.Advantages such as digital technology is meant utilizes the direct or indirect synthesizing linear FM signal of direct digital frequency synthesis technology, and that this technology has is digital control, frequency agility, phase place are continuous, shortcoming be spuious big, phase noise is big, frequency range is lower; Generally about 300MHz; The Direct Digital Frequency Synthesizers of 1GHz is also arranged, but cost an arm and a leg, and the frequency bandwidth of utilizing direct digital frequency synthesis technology to produce is limited; Be 500MHz at present to the maximum, can't satisfy the requirement of big bandwidth.
Simultaneously, because level meter uses under more abominable industrial and mineral usually, for example unattended field, tens meters high abhisecas, the factories and miness that environment is noisy, wiring cost is high, and the difficulty of maintenance is big, cost is high, and labor workload is big, the danger height.Press for a kind of technological means that can reduce difficulty of construction, reduction installation and maintenance cost, raising security.
The utility model content
The technical matters that the utility model will solve is: a kind of outer high-precision frequency modulated(FM) radar digital level meter of safeguarding of data remote and band of supporting is provided.
In order to solve the problems of the technologies described above, the technical scheme that the utility model adopted is:
A kind of wireless remote transmission frequency modulated(FM) radar digital level meter; Comprise a linear FM signal generation module; The signal that said linear FM signal generation module generates generates two paths of signals through a power splitter; One road signal is coupled with antenna through circulator, and another road signal flows to low-converter together with the output signal of said circulator, and the intermediate-freuqncy signal after the low-converter mixing is connected with prime amplifier through a wave filter; The output signal of said prime amplifier inputs to digital processing and logic control element through analog to digital conversion, and said digital processing and logic control element are connected with GPRS teletransmission data module through asynchronous serial communication interface.
Further as preferred embodiment, said linear FM signal generation module is the linear FM signal generation module based on the VCO frequency non-linear correction method of study.
Further as preferred embodiment, the centre frequency of the CW with frequency modulation signal that said linear FM signal generation module generates is 24GHz, and bandwidth is 1.5GHz.
Further as preferred embodiment, said prime amplifier is digital program controlled gain amplifier, and its gain is controlled by said digital processing and logic control element, and gain margin is-12dB ~ 30dB.
Further as preferred embodiment, said GPRS teletransmission data module comprises GPRS controller and the SIM circuit that connects successively.
The beneficial effect of the utility model is: the utility model has solved the problem that fm linearity is low, working frequency range is low, modulating bandwidth is little, phase noise is big and frequency modulation speed is low that existing signal source exists through the linear FM signal generation module; And can thing position information be sent to remote control center, and receive from the control of remote control center and configuration information to realize the outer maintenance of data remote and band through GPRS teletransmission data module.
Description of drawings
Be described further below in conjunction with the embodiment of accompanying drawing the utility model:
Fig. 1 is the functional-block diagram of the utility model wireless remote transmission frequency modulated(FM) radar digital level meter;
Fig. 2 is the functional-block diagram of the utility model wireless remote transmission frequency modulated(FM) radar digital level meter embodiment;
Fig. 3 is the functional-block diagram of the utility model linear FM signal generation module embodiment;
Fig. 4 is the functional-block diagram of the utility model GPRS teletransmission data module embodiment.
Embodiment
With reference to Fig. 1; A kind of wireless remote transmission frequency modulated(FM) radar digital level meter; Comprise a linear FM signal generation module, the signal that said linear FM signal generation module generates generates two paths of signals through a power splitter, and one road signal is coupled with antenna through circulator; Another road signal flows to low-converter together with the output signal of said circulator; Intermediate-freuqncy signal after the low-converter mixing is connected with prime amplifier through a wave filter, and the output signal of said prime amplifier inputs to digital processing and logic control element through analog to digital conversion, and said digital processing and logic control element are connected with GPRS teletransmission data module through asynchronous serial communication interface.
The utility model wireless remote transmission frequency modulated(FM) radar digital level meter is a kind of radar system based on CW with frequency modulation (FMCW) system; Said level meter is installed in the top of storage tank, the radar wave of launching certain waveform through thing position or the liquid level of emitting antenna in storage tank.Radar wave runs into object plane or liquid level and has reflex and take place in communication process, the reflection wave that reflects from object plane or liquid level is received, handles, finally obtains thing position information by radar again via antenna.The GPRS transceiver module sends to remote control center with thing position information, receives control and configuration information from remote control center simultaneously.Said linear FM signal generation module is the linear FM signal generation module based on the VCO frequency non-linear correction method of study.
With reference to Fig. 3; Said linear FM signal generation module comprises oscillator, DDS (the Direct Digital Synthesizer that connects successively; Direct Digital Synthesizer), digital phase-locked loop, low-pass filter, buffer amplifier; The signal that generates feeds back to digital processing and control circuit through analog to digital conversion; Said digital processing and control circuit pass through the linear FM signal to VCO frequency study generation standard, and through high-speed A/D converter, low-pass filter, buffer amplifier, analog switch output.The centre frequency of the CW with frequency modulation signal that said linear FM signal generation module generates is 24GHz, and bandwidth is 1.5GHz.The utility model adopts the VCO frequency non-linear correction method based on study; Not only solved the problem that fm linearity is low, working frequency range is low, modulating bandwidth is little, phase noise is big and frequency modulation speed is low that existing signal source exists; And help reducing cost, be convenient to produce and debugging.
Further as improving, with reference to Fig. 2, said prime amplifier is digital program controlled gain amplifier; Difference frequency signal after the mixing is carried out processing and amplifying; Its gain is controlled by digital signal processing and logic control element, and gain margin has enlarged the dynamic range of signal from-12dB to+30dB.
Wireless remote transmission frequency modulation radar body place meter utilizes the frequency of echoed signal and the distance of phase information measurement target, and phase measurement accuracy directly has influence on range measurement accuracy.The digital processing of level meter and logic control element obtain thing position information through the simulating signal of analyzing after the down coversion; If sampled signal is carried out direct intercepting (promptly sampling with rectangular window); Because the sidelobe level of the frequency response of rectangular window function is higher; The spectral leakage of self is more serious, brings bigger nonlinearity erron to phase measurement, can't satisfy the measuring accuracy requirement.Must adopt the window function of sidelobe level lower (being lower than 70dB) that sampled signal is carried out weighted in the design,, improve range resolution so that reduce phase error.This project intend to adopt quadravalence Blackman-Harris window function, and this window function sidelobe level is-74dB, with it sampled signal is carried out weighted after; Since second range resolution unit; Phase error is less than 0.5 ℃, and under the ideal situation, the range measurement accuracy of system can reach 1mm.
With reference to Fig. 4; Said GPRS teletransmission data module comprises GPRS controller and the SIM circuit that connects successively; Said GPRS controller is communicated by letter with digital processing and logic control element through asynchronous serial communication interface (UART), utilizes the GPRS technology to realize the data transmission and the outer maintenance of band of level meter.
More than be that preferable enforcement to the utility model specifies; But the utility model is created and is not limited to said embodiment; Those of ordinary skill in the art can also make all equivalent variations or replacement under the prerequisite of the utility model spirit, distortion that these are equal to or replacement all are included in the application's claim institute restricted portion.
Claims (5)
1. wireless remote transmission frequency modulated(FM) radar digital level meter; It is characterized in that: comprise a linear FM signal generation module; The signal that said linear FM signal generation module generates generates two paths of signals through a power splitter; One road signal is coupled with antenna through circulator, and another road signal flows to low-converter together with the output signal of said circulator, and the intermediate-freuqncy signal after the low-converter mixing is connected with prime amplifier through a wave filter; The output signal of said prime amplifier inputs to digital processing and logic control element through analog to digital conversion, and said digital processing and logic control element are connected with GPRS teletransmission data module through asynchronous serial communication interface.
2. wireless remote transmission frequency modulated(FM) radar digital level meter according to claim 1 is characterized in that: said linear FM signal generation module is the linear FM signal generation module based on the VCO frequency non-linear correction method of learning.
3. wireless remote transmission frequency modulated(FM) radar digital level meter according to claim 2 is characterized in that: the centre frequency of the CW with frequency modulation signal that said linear FM signal generation module generates is 24GHz, and bandwidth is 1.5GHz.
4. according to claim 1 or 2 described wireless remote transmission frequency modulated(FM) radar digital level meters; It is characterized in that: said prime amplifier is digital program controlled gain amplifier; Its gain is controlled by said digital processing and logic control element, and gain margin is-12dB ~ 30dB.
5. according to claim 1 or 2 described wireless remote transmission frequency modulated(FM) radar digital level meters, it is characterized in that: said GPRS teletransmission data module comprises GPRS controller and the SIM circuit that connects successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204761944U CN202382811U (en) | 2011-11-25 | 2011-11-25 | Wireless remote transmission frequency-modulated radar digital level meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204761944U CN202382811U (en) | 2011-11-25 | 2011-11-25 | Wireless remote transmission frequency-modulated radar digital level meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202382811U true CN202382811U (en) | 2012-08-15 |
Family
ID=46631306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204761944U Expired - Fee Related CN202382811U (en) | 2011-11-25 | 2011-11-25 | Wireless remote transmission frequency-modulated radar digital level meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202382811U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104482988A (en) * | 2014-12-31 | 2015-04-01 | 北京奥特美克科技股份有限公司 | Equipment and method for measuring water level and flow rate |
| CN105629223A (en) * | 2015-12-21 | 2016-06-01 | 广东欧珀移动通信有限公司 | Mobile terminal and measurement method thereof |
| 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 |
| CN105978559A (en) * | 2016-04-29 | 2016-09-28 | 中国科学院半导体研究所 | Wideband linear frequency modulated microwave signal generator |
| CN106441504A (en) * | 2016-11-09 | 2017-02-22 | 珠江水利委员会珠江水利科学研究院 | Linear frequency modulation continuous wave radar water level telemeasuring device and method |
| CN106768181A (en) * | 2017-01-11 | 2017-05-31 | 江苏麦赫物联网科技有限公司 | A kind of thing position liquid-level switch based on Microwave Detecting Technology |
| CN107677339A (en) * | 2016-08-01 | 2018-02-09 | Vega格里沙贝两合公司 | Radar apparatus for measuring charge level |
| CN109115304A (en) * | 2017-06-21 | 2019-01-01 | Vega格里沙贝两合公司 | Filling level radar installations with automatic frequency regulatory function |
| CN112763023A (en) * | 2020-12-25 | 2021-05-07 | 丹东通博电器(集团)有限公司 | Radar level gauge high-precision measurement output processing method based on optimized data model |
-
2011
- 2011-11-25 CN CN2011204761944U patent/CN202382811U/en not_active Expired - Fee Related
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN104482988A (en) * | 2014-12-31 | 2015-04-01 | 北京奥特美克科技股份有限公司 | Equipment and method for measuring water level and flow rate |
| CN104482988B (en) * | 2014-12-31 | 2017-11-28 | 北京奥特美克科技股份有限公司 | A kind of device and method for measuring water level and flow velocity |
| CN105629223A (en) * | 2015-12-21 | 2016-06-01 | 广东欧珀移动通信有限公司 | Mobile terminal and measurement method thereof |
| CN105978559A (en) * | 2016-04-29 | 2016-09-28 | 中国科学院半导体研究所 | Wideband linear frequency modulated microwave signal generator |
| CN105978559B (en) * | 2016-04-29 | 2019-03-22 | 中国科学院半导体研究所 | Wide-band LFM microwave signal generator |
| CN107677339A (en) * | 2016-08-01 | 2018-02-09 | Vega格里沙贝两合公司 | Radar apparatus for measuring charge level |
| CN107677339B (en) * | 2016-08-01 | 2021-10-15 | Vega格里沙贝两合公司 | Radar level measuring device |
| CN106441504A (en) * | 2016-11-09 | 2017-02-22 | 珠江水利委员会珠江水利科学研究院 | Linear frequency modulation continuous wave radar water level telemeasuring device and method |
| CN106441504B (en) * | 2016-11-09 | 2018-10-09 | 珠江水利委员会珠江水利科学研究院 | A kind of Modulation Continuous Wave Radar water level telemetering device and method |
| CN106768181A (en) * | 2017-01-11 | 2017-05-31 | 江苏麦赫物联网科技有限公司 | A kind of thing position liquid-level switch based on Microwave Detecting Technology |
| CN106768181B (en) * | 2017-01-11 | 2024-08-16 | 江苏麦赫物联网科技有限公司 | Material level liquid level switch based on microwave detection technology |
| US11015969B2 (en) | 2017-06-21 | 2021-05-25 | Vega Grieshaber Kg | Fill level radar device having controlled transmission power |
| US11022475B2 (en) | 2017-06-21 | 2021-06-01 | Vega Grieshaber Kg | Fill level radar device having automated frequency adjustment |
| US11029187B2 (en) | 2017-06-21 | 2021-06-08 | Vega Grieshaber Kg | Fill level reflectometer having a variable measurement sequence |
| CN109115304A (en) * | 2017-06-21 | 2019-01-01 | Vega格里沙贝两合公司 | Filling level radar installations with automatic frequency regulatory function |
| US11150122B2 (en) | 2017-06-21 | 2021-10-19 | Vega Grieshaber Kg | Fill level reflectometer having reference reflection |
| CN109115304B (en) * | 2017-06-21 | 2022-07-19 | Vega格里沙贝两合公司 | Filling level radar device with automatic frequency adjustment |
| CN112763023A (en) * | 2020-12-25 | 2021-05-07 | 丹东通博电器(集团)有限公司 | Radar level gauge high-precision measurement output processing method based on optimized data model |
| CN112763023B (en) * | 2020-12-25 | 2023-04-28 | 丹东通博电器(集团)有限公司 | High-precision measurement output processing method of radar level gauge based on optimized data model |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202382811U (en) | Wireless remote transmission frequency-modulated radar digital level meter | |
| CN108089179B (en) | Ultra-wideband radar system and method for realizing single-channel multi-frequency-point simultaneous transceiving | |
| CN102780490B (en) | DDS (direct digital synthesis) type ultra-wide band frequency-modulated signal generating circuit and method | |
| CN102840927B (en) | Surface acoustic wave temperature monitoring system suitable for gas insulated switch cabinet | |
| CN103675780B (en) | A kind of radar simulator for the full coherent of Ku wave band | |
| US8358235B2 (en) | Wireless sensor device | |
| CN103297045A (en) | High sensitivity single antenna FMCW radar | |
| Sundaresan et al. | Real time implementation of FMCW radar for target detection using GNU radio and USRP | |
| CN109459733A (en) | Anticollision Radar target velocity simulator, system and method based on pm mode | |
| CN204373741U (en) | A kind of water level detecting system | |
| CN104062637B (en) | Wide-band linear frequency modulation continuous millimeter-wave signal emitting source of line patrol obstacle avoidance radar of unmanned aerial vehicle | |
| CN201965232U (en) | High-sweeping-linearity range-measuring circuit of frequency modulation continuous wave (FMCW) radar | |
| CN101178433B (en) | Ultra-wideband quick frequency conversion source | |
| CN112485768B (en) | High-precision continuous wave speed measuring radar echo simulation method based on frequency division and multiplication mode | |
| CN202166734U (en) | Wideband frequency-modulation continuous-wave radar transceiving subsystem | |
| CN107870328A (en) | A kind of multiple target traffic radar | |
| CN112444806A (en) | S-mode integrated interrogator | |
| US20240297671A1 (en) | Phase-locked loop, radio frequency signal transmitter, radar sensor and electronic device | |
| CN115372907A (en) | IQ modulation-based linear frequency modulation implementation method and system | |
| CN205003282U (en) | Digital UHF doppler radar device | |
| CN103090930A (en) | Radar level meter and method for processing signals thereof | |
| CN212807237U (en) | 120GHz frequency modulation continuous wave radar level meter | |
| CN203858359U (en) | Unmanned plane line patrol obstacle avoidance radar broadband linearity frequency modulation continuous millimeter wave signal emission source | |
| CN107357352B (en) | A kind of accurate production method of width Power Dynamic Range microwave signal and device | |
| CN101982794A (en) | Distance measurement method applied to pulse radar and guided wave radar and control circuit of distance measure method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120815 Termination date: 20201125 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |