CN201130248Y - Speed-measuring detection instrument for radar speedometer calibrating apparatus - Google Patents
Speed-measuring detection instrument for radar speedometer calibrating apparatus Download PDFInfo
- Publication number
- CN201130248Y CN201130248Y CNU200720311376XU CN200720311376U CN201130248Y CN 201130248 Y CN201130248 Y CN 201130248Y CN U200720311376X U CNU200720311376X U CN U200720311376XU CN 200720311376 U CN200720311376 U CN 200720311376U CN 201130248 Y CN201130248 Y CN 201130248Y
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- speed
- chip microcomputer
- converter
- direct digital
- radar
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Abstract
The utility model relates to a speed-detecting verification instrument used for verification device of police traffic radar, which comprises a single-chip microcomputer and a DDS direct digital frequency synthesizer connected with the single-chip microcomputer, wherein, the output end of the DDS direct digital frequency synthesizer is connected with D/A converter, the output end of the D/A converter is connected with a control module; two groups are arranged for the DDS direct digital frequency synthesizer, the single-chip microcomputer and the D/A converter. The speed-detecting verification instrument has the advantages of high frequency accuracy and stability. Corresponding Doppler frequency value and velocity value can be arranged through external connection of the speed-detecting verification instrument with the computer.
Description
Technical field
The utility model relates to a kind of radar meter calibrating installation with the calibrating instrument that tests the speed.
Background technology
The radar meter calibrating installation is the special-purpose calibration equipment of developing for the speed calibrating of compulsory verification measurement instrument-radar meter specially, it can simulate the speed of generation moving target and the speed of displacement, is applicable to that metrological testing technology mechanism carries out measurement verification work to radar meter.
The shortcoming of existing calibrating installation:
A. the frequency stability of simulating the Doppler frequency signal generator is relatively poor
Reason---existing calibrating installation common crystal oscillator or the RC oscillators of adopting produce the simulation Doppler frequency more, so less stable.
B. simulate the output of Doppler frequency signal source and be shown as the single-frequency value, do not have kilometer numerical value to show, it is not directly perceived to set check point in the verification process, needs to calculate or the conversion of tabling look-up, and therefore causes inconvenient operation, ineffective defective.
C. to provide all be hand filling to the certificate after raw readings in the verification process and the calibrating, so workload increases and easily causes clerical mistake and make mistakes.
F., the function of the intrinsic microwave frequency value of input radar directly is not set, thereby when the natural frequency of tested radar is beyond 10GHz, 24GHz and 35GHz, do not have ready-made Doppler frequency/speed table of comparisons to look in the JJG528-2004 vertification regulation, make calibration operation be subjected to significant limitation.
The utility model content
The purpose of this utility model is at the deficiencies in the prior art, a kind of have very high-frequency accuracy and stability are provided, can produce two simulating vehicle frequency signals and the calibrating instrument that tests the speed by corresponding Doppler frequency value of external computer installation radar frequency and velocity amplitude simultaneously.
For achieving the above object, the technical solution adopted in the utility model is: a kind of radar meter calibrating installation is with the calibrating instrument that tests the speed, the DDS Direct Digital Frequency Synthesizers that comprise single-chip microcomputer, is connected with single-chip microcomputer, the output terminal of DDS Direct Digital Frequency Synthesizers connect D/A converter, the output termination control template of D/A converter, the control template output terminal connects signal wire, and described DDS Direct Digital Frequency Synthesizers, single-chip microcomputer and D/A converter are two groups.
Control template described in the utility model is connected with the computing machine that is used for being provided with according to different radar natural frequencys corresponding Doppler frequency value and velocity amplitude.
The utility model compared with prior art has the following advantages:
A. the radar meter calibrating installation is made of DDS Direct Digital Frequency Synthesizers and single-chip microcomputer with the calibrating instrument that tests the speed, thereby has very high frequency accuracy and stability, can reach 1 * 10
-5
B. the external computing machine with related software of the intelligent calibrating instrument that tests the speed realizes that frequency (Hz), speed (km/h) and voltage (mv) shield demonstration synchronously, together, and working interface is directly perceived, the efficient height.
C. owing to adopt software control,, reduced the mistake that working strength has caused with having stopped clerical mistake greatly so raw readings in the whole detection and calibration certificate generate synchronously.
D. utilize on the computing machine software to realize radar natural frequency value can directly be set arbitrarily, thereby converse Doppler frequency value and velocity amplitude automatically, the speed of new radar meter will detect the reliable technique support will be provided for future.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is the utility model working method block diagram.
Fig. 3 is the utility model course of work block diagram.
Description of reference numerals:
The 1-single-chip microcomputer; 2-DDS Direct Digital frequency is closed the 3-D/A converter;
Grow up to be a useful person;
The 4-control template; The 5-computing machine; The 6-calibrating instrument that tests the speed;
The 7-sense channel; The 8-radar meter; 9-microwave frequency counting device.
Embodiment
As shown in Figure 1, the calibrating instrument that tests the speed comprises that the output terminal of single-chip microcomputer 1, the DDS Direct Digital Frequency Synthesizers 2 that is connected with single-chip microcomputer 1, DDS Direct Digital Frequency Synthesizers 2 connects D/A converter 3, the output termination control template 4 of D/A converter 3, constitute by two groups of DDS Direct Digital Frequency Synthesizers 2 and single-chip microcomputer 1 in this example, be used for the test the speed calibrating of performance of two moving targets.Control template 4 one ends are connected with computing machine 5.
The single-chip microcomputer 1 control DDS Direct Digital Frequency Synthesizers 2 that tests the speed in the calibrating instrument produces frequency signals, conversion by D/A converter 3, through control template 4 output Doppler frequency signals, because the synthetic of two paths of signals arranged, so can produce two simulating vehicle frequency signals.
As shown in Figure 2, calibrating instrument 6 one ends that test the speed connect computing machine 5, adopt software control to realize detecting robotization on the computing machine 5, and radar natural frequency value is set arbitrarily, conversion Doppler frequency value and velocity amplitude can send to sense channel 7 with the microwave signal that is provided with by the calibrating instrument 6 that tests the speed.
Be illustrated in figure 3 as the testing process, with radar meter 8 aim detecting passages 7.When detecting the microwave transmission frequency index of radar meter 8, sense channel 7 receives microwave signals, and passes to microwave frequency counting device 9 and carry out reading by deriving cable, to judge the accuracy of radar meter 8 microwave transmission frequency values; When detecting the speed index of radar meter 8, signal modulator in the sense channel 7 is as simulation Doppler frequency transmitter, the signal of simulation speed of a motor vehicle Doppler frequency generator in the calibrating instrument 6 that tests the speed is launched to radar meter 8, then judged according to radar meter 8 speed of displaying values whether this radar meter 8 performance that tests the speed is qualified.
Principle of work:
Radar natural frequency and analog rate Doppler frequency derive conversion software automatically
According to formula:
F wherein
d---Doppler frequency, Hz;
C---electromagnetic wave propagation speed (299792.458km/s);
f
o---the natural frequency of radar meter, MHz;
K---unit conversion coefficient (10
3/ 3.6)
V---analog rate value, km/h.
With the natural frequency value of tested radar and the velocity amplitude input computer that will select, then derive corresponding Doppler frequency value automatically.
Claims (2)
1. a radar meter calibrating installation is with the calibrating instrument that tests the speed, the DDS Direct Digital Frequency Synthesizers that comprise single-chip microcomputer, is connected with single-chip microcomputer, the output terminal of DDS Direct Digital Frequency Synthesizers connect D/A converter, the output termination of D/A converter, the control template output terminal connects signal wire, it is characterized in that described DDS Direct Digital Frequency Synthesizers, single-chip microcomputer and D/A converter are two groups.
2. radar meter calibrating installation according to claim 1 is characterized in that with the calibrating instrument that tests the speed described control template is connected with the computing machine that is used for being provided with according to different radar natural frequencys corresponding Doppler frequency value and velocity amplitude.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720311376XU CN201130248Y (en) | 2007-12-24 | 2007-12-24 | Speed-measuring detection instrument for radar speedometer calibrating apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720311376XU CN201130248Y (en) | 2007-12-24 | 2007-12-24 | Speed-measuring detection instrument for radar speedometer calibrating apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201130248Y true CN201130248Y (en) | 2008-10-08 |
Family
ID=40018111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200720311376XU Expired - Fee Related CN201130248Y (en) | 2007-12-24 | 2007-12-24 | Speed-measuring detection instrument for radar speedometer calibrating apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201130248Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI456536B (en) * | 2011-11-17 | 2014-10-11 | Nat Inst Chung Shan Science & Technology | Automotive anti-collision radar digital signal processor with low-cost direct digital synthesizer and dual analog-to-digital converter (ADC) channel |
| CN107748275A (en) * | 2017-11-07 | 2018-03-02 | 广东技术师范学院 | A kind of remotely correcting method for radar current meter erecting bed |
| CN113124987A (en) * | 2021-04-19 | 2021-07-16 | 上海市计量测试技术研究院 | Intelligent verification system based on dynamic road vehicle automatic weighing apparatus and verification method thereof |
-
2007
- 2007-12-24 CN CNU200720311376XU patent/CN201130248Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI456536B (en) * | 2011-11-17 | 2014-10-11 | Nat Inst Chung Shan Science & Technology | Automotive anti-collision radar digital signal processor with low-cost direct digital synthesizer and dual analog-to-digital converter (ADC) channel |
| CN107748275A (en) * | 2017-11-07 | 2018-03-02 | 广东技术师范学院 | A kind of remotely correcting method for radar current meter erecting bed |
| CN107748275B (en) * | 2017-11-07 | 2019-09-06 | 广东技术师范学院 | A kind of remotely correcting method for radar current meter erecting bed |
| CN113124987A (en) * | 2021-04-19 | 2021-07-16 | 上海市计量测试技术研究院 | Intelligent verification system based on dynamic road vehicle automatic weighing apparatus and verification method thereof |
| CN113124987B (en) * | 2021-04-19 | 2022-08-16 | 上海市计量测试技术研究院 | Intelligent verification system based on dynamic road vehicle automatic weighing machine and verification method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081008 Termination date: 20101224 |