CN105427622A - Microwave vehicle detection device and method based on geomagnetism guidance - Google Patents
Microwave vehicle detection device and method based on geomagnetism guidance Download PDFInfo
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- 238000000034 method Methods 0.000 title abstract description 10
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- 238000004891 communication Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 3
- 230000005389 magnetism Effects 0.000 claims 5
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/04—Detecting movement of traffic to be counted or controlled using optical or ultrasonic detectors
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/042—Detecting movement of traffic to be counted or controlled using inductive or magnetic detectors
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Abstract
The invention relates to a microwave vehicle detection device and method based on geomagnetism guidance. The device comprises a geomagnetism detection unit, a microwave detection unit and a signal data processing unit. The signal data processing unit completes detection of a vehicle by performing transformation processing on signals outputted by the geomagnetism detection unit and the microwave detection unit. Vehicle magnetic field and microwave integrated detection is realized in a quite small volume by utilizing the advantage of high sensitivity of geomagnetism detection with combination of a microwave vehicle detection technology so that detection precision is enhanced, and detection accuracy can be 99.9%. The microwave detection unit only works when the vehicle is driven out or driven in so that power consumption of the microwave detection unit is reduced, the service life of hardware is prolonged, and the microwave detection unit can be used on battery powered equipment for a long time. The microwave detection unit realizes detection of the static vehicle by a mode of performing direct demodulation on microwave signals so that the hardware device of the microwave detection unit is simplified.
Description
Technical Field
The invention belongs to the field of intelligent traffic, and particularly relates to a microwave vehicle detection device and method based on geomagnetic guidance and applied to urban roads or parking lots.
Background
Vehicle detectors have very wide application in the field of intelligent transportation. The traditional vehicle detection methods have two types: one is to induce the passage of the vehicle by embedding a coil in the road. In the absence of a motor vehicle, the earth's magnetic field is in a relatively steady state; which causes a change in the earth's magnetic field as the motor vehicle passes. The method has high accuracy, but the construction workload is large, and the damage to the road is very serious because a large road surface needs to be cut. Another approach is to use a magneto-sensitive element to detect changes in the magnetic field caused by the vehicle. The detection equipment in the method has high sensitivity and small volume, can apply integrated wireless communication technology, is provided with a large-capacity battery to be made into a single detector which is buried in a road or a parking space to detect the vehicle. Because the method needs to detect the change of a weak magnetic field in the environment, the detection result is easily interfered by the change of an external magnetic field and the change of the environment, and the detection accuracy of the vehicle is influenced to a certain extent.
In recent years, microwave vehicle detectors have been widely used. The microwave vehicle detector consists of a transmitting/receiving antenna, a Voltage Controlled Oscillator (VCO), a mixer, an intermediate frequency amplifier and a detection processor. The VCO works in an X frequency band or a K frequency band, has a certain frequency modulation bandwidth, and has higher linearity in the working frequency band. The microwave signal reflected by the vehicle and received by the receiving antenna is firstly mixed with the VCO signal, then filtered and amplified to obtain a difference frequency signal, and finally the difference frequency signal is sampled and processed by the detection processor to obtain the information of the vehicle. The detection method has the disadvantages that only the echo information of the moving target can be obtained, and the processor cannot distinguish the target echo from the background echo corresponding to the static target, so that the detection scheme cannot detect the static vehicle in the parking lot.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a microwave vehicle detection device and method based on geomagnetic guidance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a microwave vehicle detection device based on geomagnetic guidance comprises: the device comprises a geomagnetic detection unit, a microwave detection unit and a signal data processing unit. Wherein,
the geomagnetic detection unit is used for acquiring a magnetic field change signal caused by the detected vehicle and sending the signal to the signal data processing unit.
The microwave detection unit comprises a transmitting part and a receiving part, the transmitting part transmits microwave signals to the detected vehicle, and the receiving part receives the microwave signals reflected by the detected vehicle, converts and amplifies the microwave signals and then sends the signals to the signal data processing unit.
And the signal data processing unit is used for converting the signals output by the geomagnetic detection unit and the microwave detection unit to finish the detection of the vehicle.
Further, the signal data processing unit mainly comprises a microprocessor or a DSP.
Further, the geomagnetic detection unit mainly comprises a magnetic field sensor.
Further, the transmitting part of the microwave detecting unit includes a microwave oscillator and a microwave transmitting antenna. And the microwave oscillator outputs a pulse modulated microwave signal under the action of the pulse signal output by the signal data processing unit, and the pulse modulated microwave signal is transmitted by the microwave transmitting antenna.
Preferably, the microwave oscillator is a DRO oscillator.
Further, the receiving part of the microwave detection unit comprises a microwave receiving antenna, a band-pass filter, a high-frequency amplifier, a detector and a video amplifier which are connected in series, and the pulse echo signal of the detected vehicle is output to the signal data processing unit.
Further, the start and the stop of the microwave detection unit are controlled by the signal data processing unit according to the magnitude of the output signal amplitude of the geomagnetic detection unit.
Further, the vehicle detection device also comprises a wireless communication module connected with the signal data processing unit, and wireless communication between the vehicle detection device and an upper computer or a server is realized.
A method for detecting a vehicle by using the device comprises the following steps:
the geomagnetic detection unit acquires a magnetic field change signal caused by the detected vehicle in real time and sends the signal to the signal data processing unit; the signal data processing unit controls the microwave detection unit to be turned off and turned on according to the following rules according to the magnitude of the output signal amplitude of the geomagnetic detection unit, and finishes vehicle detection:
if the amplitude of the output signal of the geomagnetic detection unit is lower than the threshold 1, the geomagnetic detection unit indicates that no vehicle enters or exits, and the signal data processing unit outputs a control signal to close the microwave detection unit;
if the output signal amplitude of the geomagnetic detection unit exceeds the threshold 1, indicating that a vehicle enters or exits, the signal data processing unit outputs a control signal to start the microwave detection unit to work, and the following judgment is carried out: if the amplitude of the output signal of the microwave detection unit exceeds a threshold 2, judging that a vehicle enters or exists; if the amplitude of the output signal of the microwave detection unit is lower than the threshold 2, the vehicle is judged to be driven out or not.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention adopts a combined detection mode, utilizes the advantage of high geomagnetic detection sensitivity, combines a microwave vehicle detection technology, realizes the integrated detection of the vehicle magnetic field and the microwave in a very small volume, greatly improves the detection precision, and has the detection accuracy rate of 99.9 percent.
(2) The invention adopts the joint detection mode, shortens the working time of the microwave detector, reduces the power consumption, prolongs the service life and can be conveniently used on equipment powered by a battery for a long time.
(3) The invention can realize the detection of the static vehicle by adopting a direct detection mode (without frequency mixing) to detect the microwave echo signal, thereby simplifying the hardware device of the microwave detection unit.
Drawings
Fig. 1 is a block diagram of a microwave vehicle detection device based on geomagnetic guidance.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 shows a block diagram of a microwave vehicle detection device based on geomagnetic guidance, which includes: the device comprises a geomagnetic detection unit, a microwave detection unit and a signal data processing unit.
The geomagnetic detection unit is used for acquiring a magnetic field change signal caused by the detected vehicle and sending the signal to the signal data processing unit. The geomagnetic detection unit is mainly composed of a magnetic field sensor, and the embodiment adopts a 3-axis (X, Y, Z) magnetic field sensor.
The microwave detection unit includes a transmitting portion and a receiving portion.
The transmitting part includes a microwave oscillator and a microwave transmitting antenna. The microwave oscillator outputs pulse modulated microwave signals under the action of the pulse signals output by the signal data processing unit and the pulse modulated microwave signals are transmitted by the microwave transmitting antenna. Preferably, the microwave oscillator is a DRO oscillator, frequency synthesis is performed by adopting a dielectric oscillation technology, and the microwave oscillator has the advantages of short oscillation establishment time and stable and reliable work.
The receiving part comprises a microwave receiving antenna, and a band-pass filter, a high-frequency amplifier, a detector and a video amplifier which are cascaded. The weak signal reflected by the vehicle received by the microwave receiving antenna is firstly filtered by a band-pass filter to filter signals outside a microwave carrier frequency, then is amplified by a high-frequency amplifier, is detected by a detector to output a video pulse signal, and finally is amplified by a video amplifier and then is output to a signal data processing unit. The invention adopts the technology of directly detecting the microwave signal, utilizes the characteristic that the chassis of the vehicle has stronger capability of reflecting the microwave signal than the ground reflection, can effectively detect the echo signal of the vehicle from the ground clutter, and has the advantages of simple structure, low power consumption and short reaction time.
The starting and the closing of the microwave detection unit are controlled by the signal data processing unit according to the magnitude of the output signal amplitude of the geomagnetic detection unit: when no vehicle is driven in or out, the amplitude of the output signal of the geomagnetic detection unit is lower than a threshold 1, and the signal data processing unit outputs a control signal to close the microwave detection unit; when a vehicle enters or exits, the amplitude of an output signal of the geomagnetic detection unit exceeds a threshold 1, and the signal data processing unit outputs a control signal to start the microwave detection unit to work. Because the microwave detection unit is not always in a working state, the working time is shortened, the power consumption is reduced, the service life is prolonged, and the microwave detection unit can be conveniently used on equipment powered by a battery for a long time.
The signal data processing unit adopts a microprocessor or a DSP, and completes the detection of the vehicle by converting the signals output by the geomagnetic detection unit and the microwave detection unit.
The vehicle detection device also comprises a wireless communication module connected with the signal data processing unit, and wireless communication between the vehicle detection device and an upper computer or a server is realized.
A method for detecting a vehicle by using the device comprises the following steps:
the geomagnetic detection unit acquires a magnetic field change signal caused by the detected vehicle in real time and sends the signal to the signal data processing unit; the signal data processing unit controls the microwave detection unit to be turned off and turned on according to the following rules according to the magnitude of the output signal amplitude of the geomagnetic detection unit, and finishes vehicle detection:
if the amplitude of the output signal of the geomagnetic detection unit is lower than the threshold 1, the geomagnetic detection unit indicates that no vehicle enters or exits, and the signal data processing unit outputs a control signal to close the microwave detection unit;
if the output signal amplitude of the geomagnetic detection unit exceeds the threshold 1, indicating that a vehicle enters or exits, the signal data processing unit outputs a control signal to start the microwave detection unit to work, and the following judgment is carried out: if the amplitude of the output signal of the microwave detection unit exceeds a threshold 2, judging that a vehicle enters or exists; if the amplitude of the output signal of the microwave detection unit is lower than the threshold 2, the vehicle is judged to be driven out or not.
The present invention is not limited to the above-described embodiments, and any obvious modifications or alterations to the above-described embodiments may be made by those skilled in the art without departing from the spirit of the present invention and the scope of the appended claims.
Claims (8)
1. A microwave vehicle detection apparatus based on geomagnetic guidance, the apparatus comprising: the geomagnetic detection unit, the microwave detection unit and the signal data processing unit; wherein,
the geomagnetic detection unit is used for acquiring a magnetic field change signal caused by the detected vehicle and sending the signal to the signal data processing unit;
the microwave detection unit comprises a transmitting part and a receiving part, the transmitting part transmits microwave signals to the detected vehicle, and the receiving part receives the microwave signals reflected by the detected vehicle, converts and amplifies the microwave signals and then sends the signals to the signal data processing unit;
and the signal data processing unit is used for converting the signals output by the geomagnetic detection unit and the microwave detection unit to finish the detection of the vehicle.
2. The microwave vehicle detecting apparatus based on the terrestrial magnetism guidance according to claim 1, wherein the signal data processing unit is mainly composed of a microprocessor or a DSP.
3. The microwave vehicle detecting apparatus based on terrestrial magnetism according to claim 1, wherein the terrestrial magnetism detecting unit is mainly composed of a magnetic field sensor.
4. The microwave vehicle detecting apparatus based on the geomagnetic guidance according to claim 1, wherein the transmitting part of the microwave detecting unit includes a microwave oscillator and a microwave transmitting antenna; and the microwave oscillator outputs a pulse modulated microwave signal under the action of the pulse signal output by the signal data processing unit, and the pulse modulated microwave signal is transmitted by the microwave transmitting antenna.
5. The microwave vehicle detecting apparatus based on the geomagnetic guidance according to claim 4, wherein the microwave oscillator is a DRO oscillator.
6. The microwave vehicle detecting apparatus based on the geomagnetic guidance according to claim 1, wherein the receiving part of the microwave detecting unit includes a microwave receiving antenna and a band pass filter, a high frequency amplifier, a detector and a video amplifier which are cascaded, and outputs a pulse echo signal of the detected vehicle to the signal data processing unit.
7. The microwave vehicle detecting apparatus based on terrestrial magnetism according to claim 1, wherein the start and stop of the microwave detecting unit is controlled by the signal data processing unit according to a magnitude of an output signal amplitude of the terrestrial magnetism detecting unit.
8. The microwave vehicle detection device based on geomagnetic guidance according to claim 1, wherein the vehicle detection device further comprises a wireless communication module connected to the signal data processing unit, and the wireless communication between the vehicle detection device and an upper computer or a server is realized.
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Cited By (5)
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| CN106781475A (en) * | 2016-12-21 | 2017-05-31 | 迈锐数据（北京）有限公司 | A kind of microstrip antenna modification method and device |
| CN107730995A (en) * | 2017-11-21 | 2018-02-23 | 微传智能科技（常州）有限公司 | It is a kind of to combine parking space detection method and the system that data judge |
| CN108053655A (en) * | 2018-01-11 | 2018-05-18 | 合肥恩维智能科技有限公司 | A kind of compound earth magnetism wagon detector and detection method |
| CN109024340A (en) * | 2018-09-07 | 2018-12-18 | 山东交通学院 | Safety early warning device at a kind of corner |
| CN111161547A (en) * | 2020-01-21 | 2020-05-15 | 中邮科通信技术股份有限公司 | Vehicle detection system based on NB-IoT combined geomagnetic guidance microwave detection and working method thereof |
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| CN106781475A (en) * | 2016-12-21 | 2017-05-31 | 迈锐数据（北京）有限公司 | A kind of microstrip antenna modification method and device |
| CN106781475B (en) * | 2016-12-21 | 2019-10-25 | 迈锐数据（北京）有限公司 | A microstrip antenna correction method and device |
| CN107730995A (en) * | 2017-11-21 | 2018-02-23 | 微传智能科技（常州）有限公司 | It is a kind of to combine parking space detection method and the system that data judge |
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| CN109024340A (en) * | 2018-09-07 | 2018-12-18 | 山东交通学院 | Safety early warning device at a kind of corner |
| CN111161547A (en) * | 2020-01-21 | 2020-05-15 | 中邮科通信技术股份有限公司 | Vehicle detection system based on NB-IoT combined geomagnetic guidance microwave detection and working method thereof |
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