CN102495409A - Speed checking device for vehicles - Google Patents
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- CN102495409A CN102495409A CN2011103792704A CN201110379270A CN102495409A CN 102495409 A CN102495409 A CN 102495409A CN 2011103792704 A CN2011103792704 A CN 2011103792704A CN 201110379270 A CN201110379270 A CN 201110379270A CN 102495409 A CN102495409 A CN 102495409A
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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 system 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 system 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 all in imports and the homemade 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 when carrying out traffic administration, to produce the law enforcement dispute, as handle the bad public credibility that will directly reduce the law enforcement of traffic police department; Serious meeting causes dispute between the police and the people, destroys social harmony with stable.At present, be to lean on traffic police's artificial screening in enforcing law to check on basically, artificial illegal vehicle of rejecting obvious deviation, as the travel speed of the truck of capturing be 120～160 kms/hour, the workload that has increased the traffic police with check on difficulty.
We know that the principle of radar velocity measurement tests the speed according to Doppler's principle, the radiowave of radar emission one fixed frequency; After this electric wave runs into moving object, can reflect the part electric wave, the frequency of this electric wave can produce certain variation, and this variation size is proportional to object of which movement speed; The frequency of this variation; We are referred to as Doppler shift, and when the radar frequency of operation was 24.150GHZ, the variation of one kilometer speed per hour of moving object can produce the change of frequency of 44.7HZ; We measure this frequency size, also just can draw moving object speed.Through 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 strong excessively that residual wave suppresses the bad second harmonic signal that causes; Main ripple harmonic can't discerned and distinguish to the back signal processing circuit, causes measuring error to take place frequently, especially in some homemade velocity radars; Because the limitation of high frequency treatment technology and technology, this problem is apparent in view.
Secondly, be 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, generally understands the higher gain of holding signal system, when large car or buggy when velocity radar is very near; Because the vehicle reflected signal is crossed strong and scrambling, in signal processing system, signal produces distortion and distortion; Cause serious harmonic interference such as second harmonic, directly cause the error of measuring process, when second harmonic is when going up frequency multiplication; Because frequency doubles, we just in time are twice according to the car speed that the frequency size draws, when being down during 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 through careful adjustment microwave high-frequency part running parameter and circuit performance, and the interference of this second harmonic, therefore general easy catching solve than being easier to.
For second reason, most companies are owing to signal amplification in its radar, signal A/D collection, signal FFT conversion etc. are the several separate circuit, and general is that radargrammetry sensitivity realizes through adjustment signal FFT digital filtering level all; When remolding sensitivity is higher; System can detect small-signal, also just realized of the detection of little target with target far away, but when some reason causes especially big signal to get into; Will produce signal distortion and distortion; Low excessively like sensitivity, the radar loss can raise, and other producers generally all provide software and give the user; Set the radar working sensitivity by the user according to use actual environment and needs scene; Part producer increases the Gain Automatic control circuit of AGC simulating signal at the signal amplifying element to handle this problem, because the AGC range of adjustment of general mimic channel is limited, is 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 velocity radar data acquisition and processing (DAP) 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 made relevant introduction to principle of work, the data acquisition and processing (DAP) of radar velocity measurement; " 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 synchronous collection fast to the two paths signal of radar; the radar data that collects is handled through a series of effective algorithm computation in CPU and obtained the target data that needs "; Simultaneously the final stage of same page further specifies " radar controller need be controlled the two-way dac channel radar signal is carried out synchronous high speed acquisition; the data that collect are done the processing of corresponding noise treatment, frequency transformation analysis, the relevant scheduling algorithm of data by CPU; obtain detecting the frequency spectrum of target,---".
The concrete radar velocity measurement device basically identical that uses of the disclosed technical scheme of above-mentioned paper and other prior art;, AD the saturation distortion of signal is not processed before gathering; Just adopt fixing signal gain that signal is amplified, when radar appearance caused the signal saturation distortion to produce signal distortion excessively by force, system then can only accept and handle; 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 taking place of mistake survey, test leakage phenomenon.
For realizing above-mentioned purpose, the present invention has adopted following technical scheme:
A kind of vehicle speed measuring device; It is characterized in that: two digital scalable control amplifiers are accepted front end radar high-frequency microwave respectively and are partly exported vehicle Doppler frequency signal I and the Q corresponding with car speed; The A/D of the output termination digital signal processing control module of numeral scalable control amplifier gathers port AD0, AD1; The port lines of two digital scalable control amplifiers links to each other with the control port of system digits signal processing control unit, and the car speed information that the system digits signal processing control unit obtains is through port one 4 outputs;
Numeral scalable control amplifier exports the A/D collection port AD0 of digital signal processing control module to, the signal of AD1 provides as follows; The system digits signal processing control unit at first adopts maximum amplification coefficient to amplify through control port output control signal control figure scalable control amplifier; And through A/D gather port AD0, AD1 once samples and the A/D conversion; And the signal of gathering carried out digital filtering; If A/D gathers port AD0, AD1 sampled value greater than threshold values; Then system digits signal processing control unit decision signal is crossed strong generation clipping distortion, reduces enlargement factor through control port output control signal control figure scalable control amplifier and amplifies once more till being adjusted to undistorted signal voltage, and the system digits signal processing control unit is handled this signal.
System digits signal processing control unit among the present invention adopts optimum signal to accomplish the A/D conversion and fft analysis calculates; This method has promptly guaranteed the detection and the discovery of remote little target; Guarantee the in-plant undistorted sampling of general objective again; The user does not need manually to set any parameter, and system accomplishes the processing of optimum signal automatically.Fundamentally stopped the undesired frequency multiplication phenomenon of car speed.
Description of drawings
Fig. 1 is a 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, calculates 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 the influence of big dolly reflecting surface size to signal intensity.
Vehicle speed measuring device comprises that two digital scalable control amplifiers 10,20 accept front end radar high-frequency microwave respectively and partly export vehicle Doppler frequency signal I and the Q corresponding with car speed; The A/D of the output termination digital signal processing control module 30 of numeral scalable control amplifier 10,20 gathers port AD0, AD1; The port lines 11,21 of two digital scalable control amplifiers 10,20 links to each other with the control port 31 of system digits signal processing control unit 10, and the car speed information that system digits signal processing control unit 30 obtains is through port one 4 outputs;
The signal that the A/D that numeral scalable control amplifier 10,20 exports digital signal processing control module 30 to gathers port AD0, AD1 provides as follows; System digits signal processing control unit 10 at first adopts maximum amplification coefficient to amplify through control port 31 output control signal control figure scalable control amplifiers 10,20; And through A/D gather port AD0, AD1 once samples and the A/D conversion; If A/D gathers port AD0, AD1 sampled value greater than threshold values; Then system digits signal processing control unit 10 decision signals are crossed strong generation distortion; Reduce enlargement factor 3DB through control port 31 output control signal control figure scalable control amplifiers 10,20, amplify once more till being adjusted to undistorted signal voltage, 10 pairs of these signals of system digits signal processing control unit are handled.
Described two digital scalable control amplifiers 10,20 adopt 4 root ports 11,21 to link to each other with the control port 31 of system digits signal processing control unit 10.
Described threshold value setting 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 adopt the method for the digital closed loop regulating and controlling gain of simulating signal amplifying element, and thoroughly having 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 a little less than, radar can both offer inner A/D change-over circuit optimum signal level, guarantees that the never distortion of signal is amplified and sampling.
Specify principle of work of the present invention 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; Get into 2 digital scalable control amplifiers 10,20 respectively; The A/D that the output of digital scalable control amplifier 10,20 gets into system digits signal processing control unit 30 gathers port AD0, AD1, and the control port 31 that simultaneously digital scalable control amplifier 10,20 employings 4 root port lines 11,21 are 4 scale-of-two ports and system digits signal processing control unit 30 links to each other, and the information such as car speed that system digits signal processing control unit 30 obtains are through port 32 outputs.Effective WV of system digits signal processing control unit 30 is 3.3V; The A/D of collection port AD0, AD1 samples maximum undistorted voltage range should be less than 3.3V; With the output voltage of the output terminal 12,22 of digital regulated control amplifier 10,20 is that the input port AD0 of system digits signal processing control unit 30, the input voltage of AD1 are controlled in the 3.0V; Because 15 Binary Conversion modes (15 powers=32768 of 3.3V=2) are adopted in A/D sampling, effective undistorted voltage controling value of will sampling is made as 30000 (< 32768).When radar was started working, system digits signal processing control unit 30 was at first regulated control amplifier 10,20 through control port 31 control figures and is adopted maximum amplification coefficient to amplify, and once samples and the A/>D conversion through port AD0, AD1; When finding that port AD0, AD1 sampled value are greater than 30000 the time; System digits signal processing control unit 30 is thought overflow generation distortion, and (range of adjustment is 24 power 3DB, promptly 16 grades to reduce the enlargement factor 3DB of digital regulated control amplifier 10,20 automatically through its control port 31; Be total to 48DB); Sampling analysis once more, till being adjusted to appropriate signal voltage, system digits signal processing control unit 30 adopts optimum signal to accomplish the A/D conversion and fft analysis calculates; This method has promptly guaranteed the detection and the discovery of remote little target; Guarantee the in-plant undistorted sampling of general objective again, the user does not need manually to set any parameter, and system accomplishes the processing of optimum signal automatically.Fundamentally stopped the undesired frequency multiplication phenomenon of car speed.
Control flow is appreciated that to data sampling A 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 corresponding velocity amplitude output again; Exceed the sampling valid value range in this way, then this sampling is invalid, the resonance-amplifier gain; Repeated sampling is judged once more, till satisfying sampling condition.Because each sampling and judge the adjusting time very fast (delicate less than 500), 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 digital scalable control amplifiers (10,20) are accepted front end radar high-frequency microwave respectively and are partly exported vehicle Doppler frequency signal I and the Q corresponding with car speed; The A/D of the output termination digital signal processing control module (30) of numeral scalable control amplifier (10,20) gathers port AD0, AD1; The port lines (11,21) of two digital scalable control amplifiers (10,20) links to each other with the control port (31) of system digits signal processing control unit (10), and the car speed information that system digits signal processing control unit (30) obtains is through port one 4 outputs;
Numeral scalable control amplifier (10,20) exports the A/D collection port AD0 of digital signal processing control module (30) to, the signal of AD1 provides as follows; System digits signal processing control unit (10) at first adopts maximum amplification coefficient to amplify through control port (31) output control signal control figure scalable control amplifier (10,20); And through A/D gather port AD0, AD1 once samples and the A/D conversion; And acquired signal carried out digital filtering; If A/D gathers port AD0, AD1 sampled value greater than predefined threshold values; Then system digits signal processing control unit (10) decision signal is crossed strong generation clipping distortion; Reduce enlargement factor through control port (31) output control signal control figure scalable control amplifier (10,20) and amplify once more till being adjusted to undistorted signal voltage, system digits signal processing control unit (10) is handled this undistorted signal.
2. vehicle speed measuring device according to claim 1 is characterized in that: described two digital scalable control amplifiers (10,20) adopt 4 root port lines (11,21) to link to each other with the control port (31) of system digits signal processing control unit (10).
3. vehicle speed measuring device according to claim 1 is characterized in that: described threshold value setting is 30000, and enlargement factor is divided 16 grades, and every grade differs 3DB, is total to 48DB.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110379270 CN102495409B (en) | 2011-11-25 | 2011-11-25 | Speed checking device for vehicles |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110379270 CN102495409B (en) | 2011-11-25 | 2011-11-25 | Speed checking device for vehicles |
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| CN102495409A true CN102495409A (en) | 2012-06-13 |
| CN102495409B CN102495409B (en) | 2013-04-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105911545A (en) * | 2016-06-03 | 2016-08-31 | 安徽文康科技有限公司 | Radar velocity measurement method based on gain control |
| CN105911541A (en) * | 2016-06-03 | 2016-08-31 | 安徽文康科技有限公司 | Radar velocity measurement apparatus based on gain control and system thereof |
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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105911545A (en) * | 2016-06-03 | 2016-08-31 | 安徽文康科技有限公司 | Radar velocity measurement method based on gain control |
| CN105911541A (en) * | 2016-06-03 | 2016-08-31 | 安徽文康科技有限公司 | Radar velocity measurement apparatus based on gain control and system thereof |
| 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 |
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| CN102495409B (en) | 2013-04-24 |
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