CN102495409B - Speed checking device for vehicles - Google Patents
Speed checking device for vehicles Download PDFInfo
- Publication number
- CN102495409B CN102495409B CN 201110379270 CN201110379270A CN102495409B CN 102495409 B CN102495409 B CN 102495409B CN 201110379270 CN201110379270 CN 201110379270 CN 201110379270 A CN201110379270 A CN 201110379270A CN 102495409 B CN102495409 B CN 102495409B
- Authority
- CN
- China
- Prior art keywords
- control
- port
- signal processing
- digital signal
- control module
- 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.)
- Active
Links
- 238000012545 processing Methods 0.000 claims abstract description 48
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 230000003321 amplification Effects 0.000 claims abstract description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 6
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 230000001105 regulatory effect Effects 0.000 claims description 15
- 238000005070 sampling Methods 0.000 abstract description 15
- 238000001514 detection method Methods 0.000 abstract description 5
- 230000002159 abnormal effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 230000008676 import Effects 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000003278 mimic effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Abstract
The invention relates to a speed checking device for vehicles, which comprises two digital adjustable control amplifiers, A/D (analog-digital) acquisition interfaces (AD0 and AD1) of a digital signal processing control unit and a digital signal processing control unit. A control interface outputs a control signal to control the digital adjustable control amplifiers to amplify with a maximum amplification coefficient; one-time sampling and A/D conversion are carried out through the A/D acquisition interfaces (AD0 and AD1); digital filtering is carried out on an acquired signal; and finally, the digital signal processing control unit is used for processing the signal. According to the invention, the detection and the discovery of a long-range small target are ensured, sampling without distortion of a close-range big target is also ensured, a user has no need to set any parameter manually, and a system can complete the processing of an optimum signal automatically, so that the phenomenon of abnormal frequency multiplication of the speed of the vehicles is eliminated fundamently.
Description
Technical field
The present invention relates to velocity measuring technique, especially the vehicle speed measuring technology.
Background technology
At present, at home and abroad in whole imports and the domestic various radar, when ubiquity carries out velocity survey to some oversize vehicles or jubilee wagon, moment produces the problem of 1 times or 1/2 times velocity amplitude, we are referred to as the frequency multiplication phenomenon, and this phenomenon causes traffic-police to produce the law enforcement dispute when carrying out traffic administration, as process the bad public credibility that will directly reduce the traffic law enforcement, serious meeting causes dispute between the police and the people, destroys social harmony and stable.At present, be to check on by traffic police's artificial screening in enforcing law substantially, manually reject the illegal vehicle of obvious deviation, as candid photograph to the travel speed of truck be 120～160 kms/hour, increased traffic police's workload and the difficulty of checking on.
We know, the principle of radar velocity measurement tests the speed according to Doppler's principle, the radiowave of radar emission one fixed frequency, after running into moving object, this electric wave can reflect the part electric wave, the frequency of this electric wave can produce certain variation, and this variation size is proportional to speed of moving body, the frequency of this variation, we are referred to as Doppler shift, when the radar frequency of operation is 24.150GHZ, the variation of one kilometer speed per hour of moving object can produce the frequency change of 44.7HZ, and we measure this frequency size, also just can draw moving object speed.By long-term observation research and actual test, the main cause that speed measuring device of the prior art produces the problems referred to above has 2 points:
At first because transmit and receive the mixing stage at microwave, because it is excessively strong that residual wave suppresses the bad second harmonic signal that causes, back signal processing circuit None-identified and distinguish main ripple and harmonic wave, cause measuring error to take place frequently, especially in some domestic velocity radars, because the limitation of high frequency treatment technology and technique, this problem is apparent in view.
Secondly, at signal processing stage, because the emissive power of police radar and the restriction of radar antenna volume, radar will be taken into account the needs of target far away and little target detection, the generally higher gain of meeting holding signal system, when large car or buggy from velocity radar very close to the time, because the vehicle reflected signal is crossed strong and scrambling, in signal processing system, signal produces distortion and distortion, causes the serious humorous wave interference such as second harmonic, directly causes the error of measuring process, when second harmonic is upper frequency multiplication, because frequency doubles, we just in time are twice according to the car speed that the frequency size draws, when being lower frequency multiplication, because frequency reduces 1 times, the car speed that we draw is just in time little one times.This reason is the particularly main cause of import radar generation frequency multiplication phenomenon of major part.
For first reason, can solve by careful adjustment microwave high-frequency some work parameter and circuit performance, and the interference of this second harmonic, therefore general easy catching solve than being easier to.
For second reason, overwhelming majority company is because signal amplification in its radar, signal A/D gathers, signal FFT conversion etc. is several independently circuit, general is that radargrammetry sensitivity realizes by adjusting signal FFT digital filtering level all, when remolding sensitivity is higher, system can detect small-signal, also just realized the detection to little target and target far away, but when some reason causes especially big signal to enter, will produce signal distortion and distortion, excessively low such as sensitivity, the radar loss can raise, other producers generally all provide software to the user, set the radar working sensitivity by the user according to use actual environment and needs scene, part producer increases AGC simulating signal automatic gain control circuit at the signal amplifying element to process this problem, because the AGC range of adjustment of general mimic channel is limited, be difficult to the generation of fundamentally stopping this problem.
Especially (the outstanding master of CNKI-China learns paper full-text database-degree year 2008 to be called " based on the Doppler Radar Data acquisition and processing of DSP " with Liu Zou's name in the prior art, network edition submission time 2009-02-07, " Southern Yangtze University's master thesis ") literary composition is to the principle of work of radar velocity measurement, relevant introduction has been made in data acquisition and processing (DAP), " 3.1 velocity radar controller " in the literary composition in " chapter 3 radar data acquisition and processing " (P15) clearly put down in writing following technology contents: " velocity radar controller collecting unit carries out the collection of Fast synchronization to the two paths signal of radar; the radar data that collects obtains the target data that needs through a series of Effective arithmetic computings in CPU (central processing unit) ", simultaneously the final stage of same page further specifies " radar controller need to be controlled the two-way dac channel radar signal is carried out synchronous high speed acquisition; the data that collect are made corresponding noise treatment by CPU (central processing unit); the frequency transformation analysis; the processing of the relevant scheduling algorithm of data; obtain detecting the frequency spectrum of target,---".
The concrete radar velocity measurement device that uses of the disclosed technical scheme of above-mentioned paper and other prior art is basically identical, the saturation distortion to signal does not process before AD gathers, just adopt fixing signal gain that signal is amplified, when radar appearance causes excessively by force the signal saturation distortion to produce signal distortion, system then can only receive and process, system does not possess regulating power, and the frequency multiplication phenomenon still exists in the result certainly.
Summary of the invention
The purpose of this invention is to provide a kind of vehicle speed measuring device, effectively solve the frequency multiplication phenomenon and guarantee not occuring of mistake survey, test leakage phenomenon.
For achieving the above object, the present invention has adopted following technical scheme:
A kind of vehicle speed measuring device, two adjustable joint control amplifiers of numeral respectively receiving front-end radar high-frequency microwave are partly exported vehicle Doppler frequency signal I and the Q corresponding with car speed, the A/D that numeral can be regulated the output termination digital signal processing control module of control amplifier gathers port AD0, AD1, the port lines of two adjustable joint control amplifiers of numeral links to each other with the control port of digital signal processing control module, and the car speed information exchange that the digital signal processing control module obtains is crossed port output;
Numeral can be regulated the A/D collection port AD0 that control amplifier exports the digital signal processing control module to, the signal of AD1 provides as follows, the digital signal processing control module at first can be regulated control amplifier by control port output control signal control figure and adopt maximum amplification coefficient to amplify, and by A/D collection port AD0, AD1 once samples and the A/D conversion, and the signal that gathers carried out digital filtering, if A/D gathers port AD0, the AD1 sampled value is greater than threshold value, then digital signal processing control module decision signal is crossed strong generation clipping distortion, can regulate control amplifier by control port output control signal control figure and reduce that enlargement factor is amplified again until till being adjusted to undistorted signal voltage, the digital signal processing control module is processed this signal.
Digital signal processing control module among the present invention adopts optimum signal to finish the A/D conversion and fft analysis calculates, the method had both guaranteed detection and the discovery of distance small target, guarantee again the in-plant undistorted sampling of general objective, the user does not need manually to set any parameter, and system finishes the processing of optimum signal automatically.Fundamentally stopped the undesired frequency multiplication phenomenon of car speed.
Description of drawings
Fig. 1 is theory diagram of the present invention.
Embodiment
Velocity radar mainly is for illegal activities provide the candid photograph trigger pip to traffic overspeed, because the restriction of video camera shooting distance, generally provide 60 meters with interior measuring speed and taking snap pictures signal, what that is to say our radar tests the speed working range mainly in 1-60 rice scope, calculate in free space loss according to electric wave, 1 meter of vehicle reflected signal (ignoring vehicle reflecting surface size) and 60 meters signals differ 35.55DB, consider that large dolly reflecting surface size is on the impact of signal intensity.
Vehicle speed measuring device comprise two adjustable joint control amplifiers 10 of numeral, 20 respectively receiving front-end radar high-frequency microwave partly export vehicle Doppler frequency signal I and the Q corresponding with car speed, the A/D that numeral can be regulated control amplifier 10,20 output termination digital signal processing control module 30 gathers port AD0, AD1, two adjustable joint control amplifiers 10 of numeral, 20 port lines 11,21 link to each other with the control port 31 of digital signal processing control module 30, and the car speed information exchange that digital signal processing control module 30 obtains is crossed port 32 outputs;
Numeral can be regulated control amplifier 10,20 A/D that export digital signal processing control module 30 to gather port AD0, the signal of AD1 provides as follows, digital signal processing control module 30 at first can be regulated control amplifier 10 by control port 31 output control signal control figures, 20 adopt maximum amplification coefficient to amplify, and by A/D collection port AD0, AD1 once samples and the A/D conversion, if A/D gathers port AD0, the AD1 sampled value is greater than threshold value, then digital signal processing control module 30 decision signals are crossed strong generation distortion, can regulate control amplifier 10 by control port 31 output control signal control figures, 20 reduce enlargement factor 3DB, again amplify until be adjusted to till the undistorted signal voltage, 30 pairs of these signals of digital signal processing control module are processed.
The adjustable joint control amplifier 10 of described two numerals, 20 adopts 4 root port lines 11,21 to link to each other with the control port 31 of digital signal processing control module 30.
Described Threshold is 30000, and enlargement factor is divided 16 grades, and every grade differs 3DB, is total to 48DB.
The present invention adopts numerically controlled automatic signal amplifying circuit, and the method for the digital closed loop regulating and controlling gain of employing simulating signal amplifying element, thoroughly solved the frequency multiplication problem of velocity amplitude, the designing gain range of adjustment is 48DB, cover the amplitude of variation of signal in the radar velocity measurement scope fully, no matter signal is the strongest still the most weak, and radar can both offer inner A/D change-over circuit optimum signal level, guarantees that the never distortion of signal is amplified and sampling.
Describe principle of work of the present invention in detail below in conjunction with Fig. 1.
Front end radar high-frequency microwave is partly exported vehicle Doppler frequency signal I and the Q corresponding with car speed, I, Q phase phasic difference 90 degree, amplitude differs less than 6DB, enter respectively 2 adjustable joint control amplifiers 10 of numeral, 20, numeral can be regulated control amplifier 10, the A/D that 20 output enters digital signal processing control module 30 gathers port AD0, AD1, numeral can be regulated control amplifier 10 simultaneously, 20 adopt 4 root port lines 11,21 namely the control port 31 of 4 scale-of-two ports and digital signal processing control module 30 link to each other, the information exchanges such as car speed that digital signal processing control module 30 obtains are crossed port 32 and are exported.Effective operating voltage of digital signal processing control module 30 is 3.3V, the A/D sampling maximum non-aliased voltage scope that gathers port AD0, AD1 should be less than 3.3V, it is that the input voltage of input port AD0, the AD1 of digital signal processing control module 30 is controlled in the 3.0V that numeral can be regulated control amplifier 10,20 output terminal 12,22 output voltage, because 15 Binary Conversion modes (15 powers of 3.3V=2=32768) are adopted in the A/D sampling, effective undistorted voltage controling value of will sampling is made as 30000(＜32768).When radar is started working, digital signal processing control module 30 at first can be regulated control amplifier 10 by control port 31 control figures, 20 adopt maximum amplification coefficient to amplify, and by port AD0, AD1 once samples and the A/D conversion, when finding port AD0, the AD1 sampled value was greater than 30000 o'clock, digital signal processing control module 30 is thought overflow generation distortion, automatically reduce numeral by its control port 31 and can regulate control amplifier 10, (range of adjustment is 24 power 3DB to 20 enlargement factor 3DB, namely 16 grades, be total to 48DB), again sampling analysis, until be adjusted to suitable signal voltage, digital signal processing control module 30 adopts optimum signal to finish the A/D conversion and fft analysis calculates, the method had both guaranteed detection and the discovery of distance small target, guarantee again the in-plant undistorted sampling of general objective, the user does not need manually to set any parameter, and system finishes the processing of optimum signal automatically.Fundamentally stopped the undesired frequency multiplication phenomenon of car speed.
Control flow can be understood as data sampling A and obtains the result, B judges whether sampled value exceeds effective range, as not exceeding, then carry out the Fourier transform of digital signal, obtain the Doppler frequency value of car speed, be converted into again corresponding velocity amplitude output, exceed in this way the sampling valid value range, then this sampling is invalid, the resonance-amplifier gain, repeated sampling is judged again, until satisfy sampling condition.Because each sampling and judge the adjusting time very fast (less than 500 microseconds), the time that vehicle exists in the radargrammetry angle is greater than 30 milliseconds, and radar system is the therefore vehicle that passes through of test leakage not.
Claims (3)
1. vehicle speed measuring device, it is characterized in that: two adjustable joint control amplifiers (10 of numeral, 20) receiving front-end radar high-frequency microwave is partly exported vehicle Doppler frequency signal I and the Q corresponding with car speed respectively, numeral can be regulated control amplifier (10, the A/D of output termination digital signal processing control module (30) 20) gathers port AD0, AD1, two adjustable joint control amplifiers (10 of numeral, 20) port lines (11,21) link to each other with the control port (31) of digital signal processing control module (30), the car speed information exchange that digital signal processing control module (30) obtains is crossed port (32) output;
Numeral can be regulated control amplifier (10,20) A/D that exports digital signal processing control module (30) to gathers port AD0, the signal of AD1 provides as follows, digital signal processing control module (30) at first can be regulated control amplifier (10 by control port (31) output control signal control figure, 20) adopt maximum amplification coefficient to amplify, and by A/D collection port AD0, AD1 once samples and the A/D conversion, and collection signal carried out digital filtering, if A/D gathers port AD0, the AD1 sampled value is greater than predefined threshold value, then digital signal processing control module (30) decision signal is crossed strong generation clipping distortion, can regulate control amplifier (10 by control port (31) output control signal control figure, 20) reduce enlargement factor and again amplify until be adjusted to till the undistorted signal voltage, digital signal processing control module (30) is processed this undistorted signal.
2. vehicle speed measuring device according to claim 1 is characterized in that: the adjustable joint control amplifiers of described two numerals (10,20) adopt 4 root port lines (11,21) to link to each other with the control port (31) of digital signal processing control module (30).
3. vehicle speed measuring device according to claim 1, it is characterized in that: described Threshold is 30000, and enlargement factor is divided 16 grades, and every grade differs 3DB, 48DB altogether.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110379270 CN102495409B (en) | 2011-11-25 | 2011-11-25 | Speed checking device for vehicles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110379270 CN102495409B (en) | 2011-11-25 | 2011-11-25 | Speed checking device for vehicles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102495409A CN102495409A (en) | 2012-06-13 |
| CN102495409B true CN102495409B (en) | 2013-04-24 |
Family
ID=46187249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110379270 Active CN102495409B (en) | 2011-11-25 | 2011-11-25 | Speed checking device for vehicles |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102495409B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105911541B (en) * | 2016-06-03 | 2019-05-03 | 安徽文康科技有限公司 | Radar velocity measurement apparatus and system based on gain control |
| CN105911545B (en) * | 2016-06-03 | 2019-05-03 | 安徽文康科技有限公司 | Radar velocity measurement method based on gain control |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5525996A (en) * | 1995-02-10 | 1996-06-11 | Applied Concepts, Inc. | Police traffic radar for calculating and simultaneously displaying fastest target speed |
| CN2789860Y (en) * | 2005-03-25 | 2006-06-21 | 阮树成 | Radio warning device for overspeed of motor vehicle on road |
| CN101231341A (en) * | 2007-01-26 | 2008-07-30 | 中国科学院上海微系统与信息技术研究所 | Integration vehicle flowrate radar installations directly detecting and measuring speed |
| CN201886149U (en) * | 2010-12-05 | 2011-06-29 | 中国科学院沈阳自动化研究所 | Anti-collision detector for millimeter wave radar |
| CN202433523U (en) * | 2011-11-25 | 2012-09-12 | 金庆江 | Vehicle speed measuring device |
-
2011
- 2011-11-25 CN CN 201110379270 patent/CN102495409B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5525996A (en) * | 1995-02-10 | 1996-06-11 | Applied Concepts, Inc. | Police traffic radar for calculating and simultaneously displaying fastest target speed |
| CN2789860Y (en) * | 2005-03-25 | 2006-06-21 | 阮树成 | Radio warning device for overspeed of motor vehicle on road |
| CN101231341A (en) * | 2007-01-26 | 2008-07-30 | 中国科学院上海微系统与信息技术研究所 | Integration vehicle flowrate radar installations directly detecting and measuring speed |
| CN201886149U (en) * | 2010-12-05 | 2011-06-29 | 中国科学院沈阳自动化研究所 | Anti-collision detector for millimeter wave radar |
| CN202433523U (en) * | 2011-11-25 | 2012-09-12 | 金庆江 | Vehicle speed measuring device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102495409A (en) | 2012-06-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105300530B (en) | Terahertz wave detector with reading circuit | |
| CN109581348B (en) | Method and system for adaptive detection and elimination of modulation leakage of continuous wave radar | |
| CN101285692A (en) | Delicate signal detection device | |
| CN104501967A (en) | Wide-frequency-band radiation signal multi-channel parallel output measuring method and system thereof | |
| CN105577280B (en) | A kind of light load microwave signal dynamic wideband real-time digital demodulating system | |
| CN109975772B (en) | Multi-system radar interference performance detection system | |
| CN101964633B (en) | Lock-in amplifier circuit for detecting terahertz pulse signals | |
| CN207601231U (en) | A kind of Partial Discharge Online Monitoring of Transformers system based on acooustic combination | |
| CN102495409B (en) | Speed checking device for vehicles | |
| CN201498355U (en) | Analog signal processing device of electronic current transformer | |
| CN202503522U (en) | Super heterodyne harmonic detection device | |
| CN103713243B (en) | 10V inside switch cabinet discharging detection device based on electromagnetic antenna receiving array | |
| CN110278040A (en) | A kind of high speed weak optical signal receiving module | |
| CN204244188U (en) | Signal based on lock-in amplifier amplifies and testing circuit | |
| CN103247175B (en) | Road congestion monitoring method based on idling sound frequency spectrums of automobiles | |
| CN202433523U (en) | Vehicle speed measuring device | |
| CN201830211U (en) | Lock-in amplifying circuit adopting CD552-R3 chip | |
| CN116679128A (en) | Impedance detection circuit and method of radio frequency power supply | |
| CN101340196B (en) | Multichannel digital detection IF amplifier | |
| CN108761543A (en) | A kind of improvement type Dicke's radiometer can be used for detecting invisbile plane | |
| CN204206117U (en) | A kind of amplifier of creatures' physical electric signals circuit of fast detector | |
| CN106896263A (en) | A kind of broadband radio-frequency power measuring system | |
| CN209692779U (en) | It is a kind of for capturing the receiving module of high speed weak optical signal | |
| CN203705594U (en) | 10V switch cabinet internal discharge detector based on electromagnetic wave antenna reception array | |
| CN102565185B (en) | Automatic phase tracking information processing method for using in metal foreign matter detector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: ANHUI VOCAT ION TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: JIN QINGJIANG Effective date: 20150727 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20150727 Address after: 230088 Anhui high tech Zone, Mount Huangshan Road, No. 605, the people of the center of the room, room 508 Patentee after: ANHUI VOCATION TECHNOLOGY CO., LTD. Address before: 230061 room 5, building 151, 603 Huoqiu Road, Luyang District, Anhui, Hefei Patentee before: Jin Qingjiang |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Speed checking device for vehicles Effective date of registration: 20171229 Granted publication date: 20130424 Pledgee: Hefei high tech Company limited by guarantee Pledgor: ANHUI VOCATION TECHNOLOGY CO., LTD. Registration number: 2017340000492 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20200417 Granted publication date: 20130424 Pledgee: Hefei high tech Company limited by guarantee Pledgor: ANHUI WENKANG TECHNOLOGY Co.,Ltd. Registration number: 2017340000492 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right |