CN201965233U - Flow measuring radar - Google Patents
Flow measuring radar Download PDFInfo
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- CN201965233U CN201965233U CN2011200639873U CN201120063987U CN201965233U CN 201965233 U CN201965233 U CN 201965233U CN 2011200639873 U CN2011200639873 U CN 2011200639873U CN 201120063987 U CN201120063987 U CN 201120063987U CN 201965233 U CN201965233 U CN 201965233U
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Abstract
The utility model relates to a flow measuring radar, which comprises a microwave circuit. For the microwave circuit, in a radio frequency unit, an input triangular wave modulating signal is processed by a VCO (voltage controlled oscillator) to generate a radio frequency signal; the radio frequency signal is divided into two paths of signals through a power divider; one path of signal is transmitted to a circulator through a microwave amplifier and then is output to an antenna through the circulator sequentially to be used as a transmitting signal; the other path of signal is transmitted to a frequency mixer through the microwave amplifier to be used as a local oscillator signal; the signal received by the antenna is transmitted to the frequency mixer through the circulator; an intermediate-frequency signal is output by the frequency mixer; in an intermediate-frequency processing unit, the intermediate-frequency signal from the frequency mixer is output through a low pass filter, a clipping amplifier and a hysteresis comparator sequentially; a power supply unit is used for converting external power into a power supply which can be used by other units; and a system processing unit is used for receiving the output signal of the intermediate-frequency processing unit and sending the triangular wave modulating signal to the radio frequency unit. The radar has high transmitting/receiving sensitivity and accuracy and can be used for simultaneously measuring flows and vehicle speeds of a plurality of lanes.
Description
Technical field
The utility model belongs to microwave device and technical field, specifically is the measurement of discharge radar of 10.525GHz.
Background technology
At horizontal shop, overhead road surface several " annulus ", this annulus is the magnetic coil in order to the inspection vehicle flow in some cities of China.When vehicle forced up, coil can produce electromagnetic induction, was transmitted by the underground cable line after the tracer signal.Need interim road closure, excavate the road surface but this magnet ring is installed, and because of reasons such as the road surface are impaired, its life-span generally is no more than a year and a half, the heavy traffic location was even less than 1 year.Block up at vehicle, spacing is during less than 3 meters, its accuracy of detection also can significantly reduce.Therefore, the vehicle Flow Detection device is also transformed to the contactless mode of mixed type by original single contact coil in recent years, to be traffic flow detection radar be used to obtain a kind of mode of information of road surface as intelligent transportation system with microwave traffic detecting device, has broad application prospects.
The domestic existing Related product of China comes into operation at present, such as Beijing, Shanghai etc., but the product use cost is than higher, function ratio is more single, in the face of wide track, needs a plurality of probes to test each track respectively, then data being pooled to terminal handles, so not only increased use cost, and data acquisition process speed can postpone, feedback speed is slow.
Summary of the invention
The purpose of this utility model is the deficiency at existing product, provides a kind of technical indicator better effluent amount radar, its compact conformation, and debugging easily can be satisfied the requirement of monitoring road conditions effectively.
A kind of measurement of discharge radar is characterized in that comprising shielding box body and substrate, and substrate is enclosed in the shielding box body, is loaded with microwave circuit on the substrate, and microwave circuit comprises:
Power supply unit: voltage transitions chip;
System processing unit; This processing unit adopts the circuit with signal handling capacity to get final product, for example CPLD, single-chip microcomputer etc.
Radio frequency unit: comprise VCO, power splitter, microwave amplifier, frequency mixer, circulator;
IF processing unit: comprise low-pass filter, limiting amplifier and hysteresis comparator;
In radio frequency unit, the triangular modulation signal of input produces radiofrequency signal through VCO; This radiofrequency signal is divided into two paths of signals through power splitter; One road signal is passed to circulator through microwave amplifier successively, exports to antenna through circulator again, as transmitting; Another road signal is passed to frequency mixer through microwave amplifier, as the local oscillation signal of frequency mixer; The signal that antenna receives is passed to frequency mixer through circulator; Frequency mixer output intermediate-freuqncy signal;
In IF processing unit, behind low-pass filter, limiting amplifier and hysteresis comparator, export successively from the intermediate-freuqncy signal of frequency mixer;
Described power supply unit is converted to other unit power available to externally fed; System processing unit receives the output signal of IF processing unit, sends the triangular modulation signal and gives radio frequency unit.
Be connected with bandpass filter between described VCO and the power splitter.
In the two paths of signals of described power splitter output, the one tunnel through radio frequency radio frequency amplifier connection circulator, another road process intermediate frequency amplifier connection frequency mixer.
The radiofrequency signal that VCO produces is 10.525GHz ± 100MHz; The chip model that described VCO adopts is the HMC512LP4 of HITTITE company.
Described substrate is polytetrafluoroethylglass glass cloth coated copper clad laminate.
Described VCO, bandpass filter, power splitter, radio frequency amplifier, voltage transitions chip, circulator, frequency mixer, intermediate frequency amplifier, low-pass filter and limiting amplifier all are mmic chips.
The material of described shielding box body is an aluminium.
The utlity model has good technical indicator, simple in structure and miniaturization, debugging is convenient, and cost is low.Particularly add all kinds of mmic chips, improved the global index of device, realized the performance that it is good.
The utility model is summed up the Radar Design experience, adopts the medium source oscillation signal of high stable, and low noise microwave mixer and low noise high-gain intermediate frequency process device have strengthened the sensitivity and the precision of its emission and reception.Can measure the flow and the speed of a motor vehicle of multilane simultaneously.
Description of drawings
Fig. 1 is the utility model schematic block circuit diagram.
Embodiment
Below in conjunction with accompanying drawing and embodiment the technical program is described further:
A kind of measurement of discharge radar is characterized in that comprising shielding box body and substrate, and substrate is enclosed in the shielding box body, is loaded with microwave circuit on the substrate, and microwave circuit comprises:
Power supply unit: voltage transitions chip;
System processing unit; This processing unit adopts the circuit with signal handling capacity to get final product, for example CPLD, single-chip microcomputer etc.
Radio frequency unit: comprise VCO, power splitter, microwave amplifier, frequency mixer, circulator;
IF processing unit: comprise low-pass filter, limiting amplifier and hysteresis comparator;
In radio frequency unit, the triangular modulation signal of input produces radiofrequency signal through VCO; This radiofrequency signal is divided into two paths of signals through power splitter; One road signal is passed to circulator through microwave amplifier successively, exports to antenna through circulator again, as transmitting; Another road signal is passed to frequency mixer through microwave amplifier, as the local oscillation signal of frequency mixer; The signal that antenna receives is passed to frequency mixer through circulator; Frequency mixer output intermediate-freuqncy signal;
In IF processing unit, behind low-pass filter, limiting amplifier and hysteresis comparator, export successively from the intermediate-freuqncy signal of frequency mixer;
Described power supply unit is converted to other unit power available to externally fed; System processing unit receives the output signal of IF processing unit, sends the triangular modulation signal and gives radio frequency unit.
Be connected with bandpass filter between described VCO and the power splitter.
In the two paths of signals of described power splitter output, the one tunnel through radio frequency radio frequency amplifier connection circulator, another road process intermediate frequency amplifier connection frequency mixer.
The radiofrequency signal that VCO produces is 10.525GHz ± 100MHz; The chip model that described VCO adopts is the HMC512LP4 of HITTITE company.
Described substrate is polytetrafluoroethylglass glass cloth coated copper clad laminate.
Described VCO, bandpass filter, power splitter, radio frequency amplifier, voltage transitions chip, circulator, frequency mixer, intermediate frequency amplifier, low-pass filter and limiting amplifier all are mmic chips.
The material of described shielding box body is an aluminium.
Specific in this example, a kind of 10.525GHz measurement of discharge radar, mainly by radio frequency, mixing, local oscillator, intermediate frequency, form.
The triangular modulation signal produces the radiofrequency signal of 10.525GHz ± 100MHz through VCO.Radiofrequency signal is through power splitter, and one the tunnel as transmitting, and one the tunnel as local oscillation signal.The chip model that described VCO adopts is the HMC512LP4 of HITTITE company.
Antenna is after accepting to receive transmitted wave, and through the radiofrequency signal of circulator as frequency mixer, the local oscillation signal mixing that produces with VCO goes out intermediate-freuqncy signal.
The intermediate-freuqncy signal that mixing goes out is amplified with relatively sluggish through amplitude limit through low-pass filtering again, exports to system processing unit.
Wherein, for obtaining the radiofrequency signal of precision ± 100MHz, the triangular modulation signal must advance computing and amplify to VCO, and wherein the distortion meeting causes the VCO signal to produce the deterioration of spurious signal and final signal to noise ratio (S/N ratio).It is that core is built the design that this example has selected microminiature, high integrated frequency to combine chip.This chip operation frequency range is 960～1080MHz, inner integrated voltage controlled oscillator and output amplifier, and phase noise is also outstanding, adheres to specification fully.Simultaneously, this chip is the encapsulation of microminiature Surface Mount, and peripheral circuit is less, has saved the PCB layout space like this, helps the integral miniaturization design.
Major advantage is that its integrated level is higher, helps the miniaturization of whole radar.Control and power unit adopt integrated mmic chip; Power supply chip conversion efficiency height, volume are little, have effectively controlled the power consumption of whole radar.This radar emission end adopts waveguide mouth, low, the compact conformation of loss, antivibration and capability of electromagnetic shielding excellence.
During specific implementation, this measurement of discharge radar mainly comprises aluminium shielding box body, VCO, bandpass filter, power splitter, radio frequency amplifier, power conversion chip, circulator, frequency mixer, intermediate frequency amplifier (amplification as local oscillation signal is used), low-pass filter, limiting amplifier (as the intermediate frequency amplifier from the low-pass filter signal), corresponding connector, wide-dielectric constant polytetrafluoroethylglass glass cloth coated copper clad laminate etc.
The triangular modulation signal is input among the VCO, exports a signal, is divided into two paths of signals through power splitter then, and one the tunnel is after radiofrequency signal is amplified through radio frequency amplifier, to launch by circulator.VCO, the required voltage of radio frequency amplifier are converted to by power conversion chip, and efficient height, volume are little.
The signal that reception reflects, the input circulator is to the RF port of frequency mixer.After amplifying through this vibration magnifier, another road signal that power splitter is told is input to the LO port of frequency mixer.
Signal after the mixing is input to after low-pass filter, limiting amplifier carry out filtering and amplify, and finally exports to system processing unit.
The design of circuit relies on the application of wide-dielectric constant polytetrafluoroethylglass glass cloth coated copper clad laminate, makes that the performance of circuit is given full play to, and has guaranteed the realization of every index; And substituted import sheet material with this homemade sheet material, effectively reduced cost and lead time.
The measurement of discharge of conventional design need be set up the model of entire device in the associated electromagnetic field simulation software, set and find the solution correlation parameter, so that obtain optimum performance, the utility model also obtains thus.Be the receiver technical indicator that designs by the demand of system below:
Frequency of operation: 10525MHz ± 10MHz
Output power: 10dBm ± 1dBm
Bandwidth: 200MHz ± 20MHz
Modulation system; Linear frequency modulation
Modulation signal: 3.5V～5.5V triangular signal
Output intermediate-freuqncy signal: 1V (P-P)
Operating voltage: DC+9V
Interface: 5 core air plugs
Power consumption:＜5W
Working temperature :-20 ℃～+ 65 ℃
Humidity: 0%～90%.
Claims (8)
1. a measurement of discharge radar is characterized in that comprising shielding box body and substrate, and substrate is enclosed in the shielding box body, is loaded with microwave circuit on the substrate, and microwave circuit comprises:
Power supply unit: voltage transitions chip;
System processing unit;
Radio frequency unit: comprise VCO, power splitter, microwave amplifier, frequency mixer, circulator;
IF processing unit: comprise low-pass filter, limiting amplifier and hysteresis comparator;
In radio frequency unit, the triangular modulation signal of input produces radiofrequency signal through VCO; This radiofrequency signal is divided into two paths of signals through power splitter; One road signal is passed to circulator through microwave amplifier successively, exports to antenna through circulator again, as transmitting; Another road signal is passed to frequency mixer through microwave amplifier, as the local oscillation signal of frequency mixer; The signal that antenna receives is passed to frequency mixer through circulator; Frequency mixer output intermediate-freuqncy signal;
In IF processing unit, behind low-pass filter, limiting amplifier and hysteresis comparator, export successively from the intermediate-freuqncy signal of frequency mixer;
Described power supply unit is converted to other unit power available to externally fed; System processing unit receives the output signal of IF processing unit, sends the triangular modulation signal and gives radio frequency unit.
2. measurement of discharge radar according to claim 1 is characterized in that being connected with bandpass filter between described VCO and the power splitter.
3. measurement of discharge radar according to claim 1 and 2 is characterized in that in the two paths of signals of described power splitter output, and one the tunnel through radio frequency radio frequency amplifier connection circulator, another road process intermediate frequency amplifier connection frequency mixer.
4. measurement of discharge radar according to claim 1 is characterized in that the radiofrequency signal that VCO produces is 10.525GHz ± 100MHz.
5. measurement of discharge radar according to claim 4 is characterized in that the chip model that described VCO adopts is the HMC512LP4 of HITTITE company.
6. measurement of discharge radar according to claim 1 is characterized in that described substrate is polytetrafluoroethylglass glass cloth coated copper clad laminate.
7. measurement of discharge radar according to claim 2 is characterized in that described VCO, bandpass filter, power splitter, radio frequency amplifier, voltage transitions chip, circulator, frequency mixer, intermediate frequency amplifier, low-pass filter and limiting amplifier all are mmic chips.
8. measurement of discharge radar according to claim 1, the material that it is characterized in that described shielding box body is an aluminium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200639873U CN201965233U (en) | 2011-03-11 | 2011-03-11 | Flow measuring radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200639873U CN201965233U (en) | 2011-03-11 | 2011-03-11 | Flow measuring radar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201965233U true CN201965233U (en) | 2011-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200639873U Expired - Lifetime CN201965233U (en) | 2011-03-11 | 2011-03-11 | Flow measuring radar |
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| CN (1) | CN201965233U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102897156A (en) * | 2012-10-22 | 2013-01-30 | 安徽省鸿运机械制造有限公司 | Intelligent slowing system for vehicle |
| CN106646455A (en) * | 2016-09-09 | 2017-05-10 | 电子科技大学 | Pavement scattering characteristic measuring method and radar device |
| CN107748363A (en) * | 2017-12-13 | 2018-03-02 | 山西禾源科技股份有限公司 | A kind of millimeter wave foad monitoring radar |
| CN113092810A (en) * | 2021-05-08 | 2021-07-09 | 无锡航征科技有限公司 | High-sensitivity radar current meter |
-
2011
- 2011-03-11 CN CN2011200639873U patent/CN201965233U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102897156A (en) * | 2012-10-22 | 2013-01-30 | 安徽省鸿运机械制造有限公司 | Intelligent slowing system for vehicle |
| CN106646455A (en) * | 2016-09-09 | 2017-05-10 | 电子科技大学 | Pavement scattering characteristic measuring method and radar device |
| CN106646455B (en) * | 2016-09-09 | 2019-02-12 | 电子科技大学 | A kind of road surface scattering property measuring method and radar installations |
| CN107748363A (en) * | 2017-12-13 | 2018-03-02 | 山西禾源科技股份有限公司 | A kind of millimeter wave foad monitoring radar |
| CN113092810A (en) * | 2021-05-08 | 2021-07-09 | 无锡航征科技有限公司 | High-sensitivity radar current meter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: CAIHUA SCIENCE-TECHNOLOGY GROUP CO., LTD., NANJING Effective date: 20121022 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhang Jun Inventor after: OUYANG JIANWEI Inventor after: Yan Xiuchen Inventor after: Yang Guangju Inventor after: Yu Quan Inventor before: Zhang Jun Inventor before: OUYANG JIANWEI Inventor before: Yan Xiuchen Inventor before: Yang Guangju |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: ZHANG JUN OUYANG JIANWEI YAN XIUCHEN YANG GUANGJU TO: ZHANG JUN OUYANG JIANWEI YAN XIUCHEN YANG GUANGJU YU QUAN |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20121022 Address after: Qixia District of Nanjing City, Jiangsu province 210049 horses outside Zhongshan Tsing Ma No. 1 North Street Patentee after: JIANGSU JUNYI INTERNET OF THINGS CO., LTD. Patentee after: NANJING CAIHUA TECHNOLOGY GROUP CO., LTD. Address before: Qixia District of Nanjing City, Jiangsu province 210049 horses outside Zhongshan Tsing Ma No. 1 North Street Patentee before: JIANGSU JUNYI INTERNET OF THINGS CO., LTD. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20110907 |
|
| CX01 | Expiry of patent term |