CN104700629B - A kind of monitoring and pre-warning system and method for expressway fog - Google Patents
A kind of monitoring and pre-warning system and method for expressway fog Download PDFInfo
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- CN104700629B CN104700629B CN201410610850.3A CN201410610850A CN104700629B CN 104700629 B CN104700629 B CN 104700629B CN 201410610850 A CN201410610850 A CN 201410610850A CN 104700629 B CN104700629 B CN 104700629B
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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
- G08G1/048—Detecting movement of traffic to be counted or controlled with provision for compensation of environmental or other condition, e.g. snow, vehicle stopped at detector
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01W—METEOROLOGY
- G01W1/00—Meteorology
Abstract
The invention discloses a kind of monitoring and warning system of expressway fog, including visibility detection unit, sensor assembly, message processing module, data memory module, GPRS data transport module, module, phonetic alarm and long-range host computer is locally displayed；Above-mentioned module is powered by solar powered module；Visibility detection unit, sensor assembly and message processing module are connected；Message processing module and data memory module, GPRS data transport module, module, phonetic alarm is locally displayed it is connected respectively；GPRS data transport module is connected with long-range host computer；Visibility detection unit includes LED/light source and BH1750FVI digital optical intensity detection chips；Message processing module includes interconnecting the controller and I/O expansion plate coordinated；Controller includes master controller and from controller, and core is Atmega328 single-chip microcomputers.Detection speed of the present invention is fast, with low cost, lays flexibly, easy to maintenance, can be widely applied to safety monitoring field along highway.
Description
Technical field
The present invention relates to a kind of monitoring and warning system, and in particular to a kind of monitoring and warning system for expressway fog
And method.
Background technology
Group's mist is substantially also mist, is influenceed by some areas moist heat, and tens of rice are to rice up to a hundred in dense fog
Subrange in, the mist that fog is denseer, visibility is lower of appearance.The outer sight of group's mist is good, a piece of dim in group's mist.Group's mist
Prediction is difficult, regional strong, easily causes major traffic accidents.Group's mist causes because local steam raying cools.When low
When layer water vapor condition is relatively good, group's mist is easier to occur, especially latter to two days of rain, compares if weather is fine
Easily occur.
The important traffic characteristic of highway is that speed is fast, the volume of traffic big, once occurring after traffic accident, its miserable degree compared with
Greatly, it is one of current most terrible weather influence factor of influence highway to roll into a ball mist.Compared with urban district, why highway
Residing suburb and rural area are easier group's mist occur, by expert research and analysis, draw following reason：
1st, because a mist and Partial little climate environmental concerns are close, and express highway pavement day temperature is higher, warm round the clock
Difference is bigger, and the group's of being more beneficial for mist is formed；
2nd, the increase of some exhaust emission composition granules of near Highway, such as autumn crop straw burning, industrial dust pollution, car tail
Gas discharge etc., the increase of particulates, the group's of advantageously forming mist.
Group's mist is different with having a dense fog, and its sphere of influence is smaller, just as a cloud fallen to the ground, rolls into a ball mist
Outer sight is good, looks around dim in group's mist；Group's mist visibility is very low, general only ten to 20 meters；Its coverage is in one section
One section of form, some places are few, and some places are dense；And area coverage size is also inconsistent, in general, big group's mist
Area coverage is about five kilometers, and small group's mist only has one kilometer.
Group's mist brings great potential safety hazard to driving, especially on the faster highway of road speed.Due to group
The regionality that mist occurs is very strong, and prediction is difficult, and vehicle is difficult to be notified or warn in advance, not yet possesses effective solution at present
The method of group's mist problem.The thick fog weather for influenceing larger mainly visibility to be less than 500 meters to expressway operation management, especially
It is less than 200 meters of low visibility weather.Because the life of mist disappears change quickly, visibility drops to tens meters only from several kms sometimes
A few minutes are needed, artificial observation is difficult to find in time and take corresponding management measure.Intelligent transportation is realized, need to be using automatic prison
Survey.Because a mist prediction is difficult, regional very strong, vehicle is difficult to be notified or warn in advance, waits driver to recognize have
When mist, have been enter into Tuan Wu centers, sometimes driver just from a mist out, can next mist but inadvertently
Come, make people hard to guard against, usually lead to major traffic accidents, therefore group's mist is referred to as " the flowing killer " on highway.
According to statistics, the probability that traffic accident occurs for the greasy weather is higher by several times, or even tens times than usual, and many cars connect caused by thick fog, group's mist
Continuous rear-end collision occurs repeatedly, and loss is serious, great lethality.
In a mist detection technique, the detection technique of visibility is most important, and traditional visibility detection is usually light source
Part uses infrared diode, and is modulated, and is sent in infrared pulse form.The main PIN diode of light receiving part or
Other photosensitive parts, convert optical signals to electric signal, main to realize weak signal extraction using phase lock circuitry.This detection side
The benefit of method is that the optical signal after modulation can not be influenceed by bias light, therefore visibility meter generally can be directly empty in air
Used under spacious environment, and 24 continuous throughout the twenty-four hour24s can be accomplished, precision is high.But detection method composition is complicated, generally need
Servicing unit is wanted, cost is high, and the signal extraction of especially receiving terminal is relatively difficult, and the signal of extraction is typically sinusoidal signal, needs
Visibility can be just determined after changing.
The existing expressway fog monitoring device of China can only be forecast to extensive area dense fog, but group's mist
Life disappear that change is very fast, expressway fog is big using personal monitoring's difficulty, and the automatic visibility meter of weather monitoring station is generally
Forward scattering type, is only capable of monitoring the meteorological situation of change near the point, it is impossible to group's mist in the long and narrow banding space of highway
Reliably monitored.Vaporific condition is rolled into a ball on highway due to that can not grasp in time, to road on the vehicle that the travels group of offer in time
Mist information.Current freeway management department can only take road closure is forbidden to wait negative means to be managed a mist period of right time,
Although preventing the generation of traffic accident, the traffic capacity of highway is sacrificed, conevying efficiency is reduced, to public at a high speed
Road owner causes huge economic loss.
Also there are some mechanism researchs the visibility meter standard of comparison of meteorological department, the country and produced, and accreditation is compared at present
And large area is that Visa is drawn, visibility meter is also otherwise varied according to maximum range, the different prices of subsidiary product, 20km energy
The price of measurement journey is seen at 70,000 yuan, if with weather situation monitoring, additional 30,000 yuan, that is, 100,000 yuan.These detections are set
It is standby expensive, it is difficult to promote the use of on a large scale.The layout density and data transmission of expressway visibility automatic Observation instrument
Time interval is different.On the relatively advanced Shanghai-Nanjing freeway of facility, about 10 kilometers of the interval of visibility automatic Observation space length,
Pass within every 1 minute a data, but group's mist apart from general less than 10 kilometers, so automatic observer can not the group of monitoring completely
Mist.When visibility is below 200 meters, larger error may also occur in automatic observer.
The content of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of with low cost, lay flexibly, it is easy to maintenance
Expressway fog monitoring and pre-warning system and method, can be widely applied to safety monitoring field along highway.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of monitoring and warning of expressway fog
System, including visibility detection unit, sensor assembly, message processing module, data memory module, GPRS data transmission mould
Block, module, phonetic alarm, long-range host computer is locally displayed, concrete structure of the invention is as follows：
Above-mentioned module is powered by solar powered module；The visibility detection unit, the output end of sensor assembly
It is connected with the input of message processing module；The output end of described information processing module is passed with data memory module, GPRS data
Defeated module, module is locally displayed, the input of phonetic alarm is connected respectively；The GPRS data transport module with it is long-range upper
Machine is connected；
The visibility detection unit includes light source and integrated digital light-intensity test chip；
Described information processing module includes interconnecting the controller and I/O expansion plate coordinated；The controller includes passing through
Master ＆ slave control line connection master controller and from controller, the master controller and the core from controller are Atmega328
Single-chip microcomputer.
Further, the distance of light source and integrated digital the light-intensity test chip is 50-60cm.
Further, the light source is 5VLED white light sources.
Further, the sensor assembly includes humidity sensor and air velocity transducer and wind transducer and atmospheric pressure
Sensor.
Further, it is described that any one that module is 24V red green warning lamp or electronic caution board is locally displayed.
The invention also discloses a kind of method of the monitoring and warning system of expressway fog as described above, including it is as follows
Method and step：
A. module initialization；
B. sensor assembly is started working, forward scattering illuminance in detection current background illuminance, space, is detected wet
Degree, wind speed, wind direction, barometric pressure parameters；
C. start the data that master controller collection sensor is detected, and data preparation is encapsulated；
D. master controller is by master ＆ slave control line traffic control from the read-write, storage, display function of controller, and data are through data
Bus is sent to from controller from master controller；
E. after controller receiving data, data are respectively sent to data memory module and GPRS data transport module
To store and transmit；
F. GPRS data transport module is started, every piece of module is first configured before first use, destination address is set on long-range
A certain port address under the machine IP address of position, each module correspondence a port number, sends data；
G. visibility scale is judged, if threaten traffic safety, if reaching early-warning conditions, module is locally displayed in startup
Warning lamp or warning sign, start phonetic alarm；If being not reaching to early-warning conditions, return to step b；
H. while starting GPRS data transport module, GPRS data transport module sends data to long-range upper
Machine, runs monitoring interface；
I. port information is detected, and reads data；
J. decoded packet data, isolates the data that each sensor is detected, and deliver to display control progress data display；
K. decided whether to issue warning information by Surveillance center's professional's artificial judgment.
Beneficial effects of the present invention are as follows：
1. detection speed of the present invention is fast, with low cost, lay flexibly, it is easy to maintenance, it can be widely applied to highway
Safety monitoring field along the line.
2. visibility detection unit of the present invention uses Forward scattering principle, examined using LED white light sources and digital optical intensity
Survey chip and illuminance is detected as core component, simple, intuitive, without complicated light source and signal deteching circuit design, judges
Speed is fast.
3. the present invention uses GPRS using the multi-sensor collection technology collection highway environment parameter related to rolling into a ball mist
The telecommunication mode that network is combined with Ethernet, the data transfer that highw ay m onitoring point is gathered is into point duty
The host computer of the heart, if reaching early-warning conditions, electronic display board and phonetic alarm device near monitoring point will be anti-in time
Warning information is reflected, vehicular traffic is reminded, command centre's work can take corresponding measure according to warning grade, it is ensured that highway
Traffic safety.
4. the visibility detection unit of the present invention uses light source and integrated digital light-intensity test chip, message processing module fortune
Atmega328 single-chip microcomputers, all with low cost, lay flexible, easy to maintenance advantage, can be widely applied at a high speed
Highways ' safety monitoring field.
Brief description of the drawings
Fig. 1 is system principle diagram of the invention.
Fig. 2 is present system totally communication block diagram.
Fig. 3 is Forward scattering schematic diagram of the invention.
For visibility detection unit of the invention, the illumination under dark situation detects datagram to Fig. 4.
For visibility detection unit of the invention, the illumination in the case where there is luminous environment detects datagram to Fig. 5.
Fig. 6 is operation principle block diagram of the invention.
Fig. 7 is flow chart of work methods of the invention.
The label of accompanying drawing 3：1st, light source；2nd, light-intensity test chip；3rd, mist is rolled into a ball.
Embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book understands other advantages and effect of the present invention easily.
As shown in figure 1, a kind of monitoring and warning system of expressway fog of the present invention, including visibility detection unit,
Sensor assembly, message processing module, data memory module, GPRS data transport module, module, phonetic alarm is locally displayed
With long-range host computer, specific attachment structure is as follows：
Above-mentioned module is powered by solar powered module, visibility detection unit, the output end of sensor assembly and letter
Cease the input connection of processing module, output end and data memory module, GPRS data transport module, the sheet of message processing module
Ground display module, the input of phonetic alarm are connected respectively, and GPRS data transport module is connected with long-range host computer.
The innovative point of the present invention includes light source and integrated digital light-intensity test chip for visibility detection unit, and light source is passed through
Group's mist scatters to detection chip, forms forward-scattering angle；Above-mentioned visibility detection unit, is responsible for see along detection highway
Degree.Message processing module includes interconnecting the controller and I/O expansion plate coordinated, and controller includes master controller and from control
Device, core is Atmega328 single-chip microcomputers.Master controller is responsible for data acquisition encapsulation, and data transmission, storage are responsible for from controller
And display.
As shown in Fig. 2 message processing module is responsible for the control management of whole monitoring node and communicated with sensor assembly, and
Processing encapsulation is carried out to gathered data, and transfers information to module and phonetic alarm is locally displayed, while being responsible for information
It is sent to GPRS data transport module and realizes telecommunication using long-range host computer, the information monitored can also be preserved to number
According to memory module.
As the further optimization to the present invention, the distance of light source and integrated digital light-intensity test chip is 50-60cm,
This ensure that light source can be sent to integrated digital light-intensity test chip after a mist scattering, light source is 5VLED white light sources,
Integrated digital light-intensity test chip is BH1750FVI chips.Sensor assembly includes humidity sensor, air velocity transducer, wind direction
Sensor and atmosphere pressure sensor.Any one that module is 24V red green warning lamp or electronic caution board is locally displayed.On long-range
Position machine is a kind of technology based on virtual instrument of use LabView software developments, is responsible for receiving, stores, handles monitoring point hair
The data come, each monitoring point of management and control.
As shown in figure 3, Forward scattering is a kind of visibility measuring method based on forward scattering coefficient.Work as light
By that can occur scattering because of droplet effect during mist 3 and absorb, and with energy attenuation, positioned at the heteropleural of light source 1
BH1750FVI digital optical intensities detection chip 2 can receive scattered signal.Scattered signal is stronger, shows that mist amount is bigger, i.e. visibility
It is lower.When scattered signal reaches certain threshold value, you can think that visibility is less than warning value, corresponding Forewarning Measures need to be made.It is right
Below 500m visibility low values are mainly measured in highway, more than 500m visibility weather influences not for traffic safety
Greatly, can be without detection.The forward-scattering angle of Forward scattering can be obtained by repetition test（Angle of scattering is scattering direction and incidence
Angle between direction）Scope is when 20-50 spend, and Detection results are optimal.
More directly perceived with the detection object that illumination is used as visibility, illumination is a kind of list for weighing intensity of illumination first
In position, visibility correlation theory, also there is the corresponding mathematical relationship between visibility and illumination.We use BH1750FVI chips
It is one piece of integrated light intensity detection chip, output quantity is directly unit of illuminance, without conversion.Simultaneously visible light wave range sensitivity compared with
Get well, relatively the normal vision receptive field of people.Because the light source that we use is that without ovennodulation, and detection chip is
Bias light and scattered signal are not differentiated between, therefore has how to determine the problem of scattered signal is strong and weak, i.e., how to judge visibility
Size.We have proposed the method for an illumination contrast：
When the 1st, not starting light source, respectively in dark situation and under having a luminous environment, the bias light illumination of current spatial, record are detected
For X, as shown in Figure 4 and Figure 5；
When the 2nd, starting light source, it is delayed some seconds, mainly for transmission signal is stable, respectively in Crape ring corresponding with step 1
Border and there is the scattering illuminance that now correspondence position is detected under luminous environment, be recorded as Y, as shown in Figure 4 and Figure 5；
3rd, by X, Y is made the difference, i.e. Y-X, obtains difference, and threshold of visibility is judged according to size of the difference.
4th, above step is repeated, continuous measurement is realized.
By above-mentioned data, we can analyze, and usual difference is in 1-2 unit of illuminance, it is believed that fogless or mist, without pre-
It is alert；More than 3-4 units can consider mist, it is necessary to early warning；More than more than 5 unit of illuminance it is considered that having a mist or doubting
Like group's mist, it is necessary to early warning.Whether really specific group's mist, it is necessary to which professional makes in upper command post with reference to other meteorologic parameters
Judge, issue final warning information.
This method simple, intuitive, without complicated light source and signal deteching circuit design, judges that speed is fast, detection signal and
The mapping relations of visibility are easier to establish.Due to the characteristic of a mist, group's mist period of right time is in night or stage at dawn（Environment
Illumination is smaller）, therefore we do not need to detect a mist within 24 hours, can at times be worked with whole system.
The specific design principle block diagram of the present invention is as shown in fig. 6, sensor assembly is sensed comprising humidity sensor, wind speed
Device, wind transducer, baroceptor.The light source open and close of visibility detection unit is by host computer control, and detection chip passes through
IIC communication modes, are connected in parallel on iic bus.Baroceptor also using by IIC communication modes, is connected in parallel on iic bus.
IIC communications are, with address, therefore can to connect each terminal with parallel way.Humidity sensor, air velocity transducer, wind transducer
Use analog sensor, operating voltage 5V, three-wire system（VCC,GND,Single）.
Controller includes Arduino UNO R3 development boards and sensor special expansion board V6 editions, and Arduino UNO R3 are
Main controller, its core single-chip microcomputer is ATmega328.It is onboard to have 10bitAD conversion chips, with IIC communication functions.The design is adopted
With two pieces of Arduino development boards（Containing expansion board）Build host-guest architecture, it is therefore intended that expanded function mouthful, improve compatibility, be modern
Functional module is changed afterwards and provides convenient, while reducing single single-chip microcomputer load, makes functional materialization, it is convenient to safeguard from now on.Wherein,
Master controller is responsible for being connected with sensor assembly, is responsible for data acquisition, and data are packaged.In the next generator terminal to actual measurement number
According to simple analysis is carried out, judge whether to reach early-warning conditions.Master controller and logical using IIC from the data communication between controller
News, control signal is transmitted in switching value form by master-slave controller digital I/O port, i.e. master ＆ slave control line in Fig. 6 is so kept away
Exempted from it is inconsistent on master-slave controller work schedule, from the effective management and control of work main controller of controller.From controller master
It is responsible for data receiver, storage, remote data transmission, transmission pre-warning signal.Main controller is controlled, and does not receive control signal
When, it is waited for, receives after signal, completes corresponding operation.
GPRS data transport module does not possess 485 communication functions in itself using 485 communications, Arduino UNO development boards, but
It can increase by 485 functions by adding expansion board.Expansion board is onboard MAX485 chips, the TTL signal that can use Arduino
It is converted into 485 signals.
Data memory module, i.e. SD card memory module socket containing SD and SD card, module pass through SPI sockets and master controller phase
Even.
The electronic alarm lamp of module is locally displayed（Board）And phonetic alarm, pass through Control.General early warning
Mainly warning lamp（Board）, due to a mist low visibility, once into wherein sight extreme difference, warning lamp（Board）It may not necessarily play very
Good effect, now, phonetic alarm can then be guided by speech form to driver.
Solar powered module monitoring point provides DC9V, DC5V or DC24V power supply.
As shown in fig. 7, a kind of method of work of the monitoring and warning system of expressway fog of the present invention is as follows：
A. module initialization；
B. sensor assembly is started working, forward scattering illuminance in detection current background illuminance, space, is detected wet
Degree, wind speed, wind direction, barometric pressure parameters；
C. start the data that master controller collection sensor is detected, and data preparation is encapsulated；
D. master controller is by master ＆ slave control line traffic control from the read-write, storage, display function of controller, and data are through data
Bus is sent to from controller from master controller；
E. after controller receiving data, data are respectively sent to data memory module and GPRS data transport module
To store and transmit；
F. GPRS data transport module is started, every piece of module is first configured before first use, destination address is set on long-range
A certain port address under the machine IP address of position, each module correspondence a port number, sends data；
G. visibility scale is judged, if threaten traffic safety, if reaching early-warning conditions, module is locally displayed in startup
Warning lamp or warning sign, start phonetic alarm；If being not reaching to early-warning conditions, return to step b；
H. while starting GPRS data transport module, GPRS data transport module sends data to long-range host computer,
Run monitoring interface；
I. port information is detected, and reads data；
J. decoded packet data, isolates the data that each sensor is detected, and deliver to display control progress data display；
K. decided whether to issue warning information by Surveillance center's professional's artificial judgment.
A kind of expressway fog warning monitoring system analyzed based on visibility of the present invention, it is real using Forward scattering
Now group's mist threshold of visibility monitoring, and using the multi-sensor collection technology collection highway environment parameter related to rolling into a ball mist,
The telecommunication mode being combined using GPRS network with Ethernet, the data transfer best friend that highw ay m onitoring point is gathered
The long-range host computer of logical command centre, if reaching early-warning conditions, electronic display board and phonetic alarm near monitoring point
Warning information will be reflected in time, vehicular traffic is reminded, command centre's work can take corresponding measure according to warning grade, really
Protect express way driving safety.The present invention lays flexible, easy to maintenance advantage, can be widely applied to with low cost
Safety monitoring field along highway.
Claims (5)
1. a kind of execution method of the monitoring and warning system of expressway fog, it is characterised in that：The prison of the expressway fog
Detection early warning system includes visibility detection unit, sensor assembly, message processing module, data memory module, GPRS data and passed
Defeated module, module, phonetic alarm, long-range host computer is locally displayed；Above-mentioned module is powered by solar powered module；It is described
The input connection of visibility detection unit, the output end of sensor assembly and message processing module；Described information processing module
Output end and data memory module, GPRS data transport module, module is locally displayed, the input of phonetic alarm connects respectively
Connect；The GPRS data transport module is connected with long-range host computer；The visibility detection unit includes light source and integrated digital
Light-intensity test chip；Described information processing module includes interconnecting the controller and I/O expansion plate coordinated；The controller bag
Include the master controller that is connected by master ＆ slave control line and be from controller, the master controller and the core from controller
Atmega328 single-chip microcomputers；
The execution method includes following method and step：
A. module initialization；
B. sensor assembly is started working, forward scattering illumination in visibility detection unit detection current background illuminance, space
Degree, sensor assembly detection humidity, wind speed, wind direction, barometric pressure parameters；
C. start the data that master controller collection sensor is detected, and data preparation is encapsulated；
D. master controller is by master ＆ slave control line traffic control from the read-write, storage, display function of controller, and data are through data/address bus
It is sent to from master controller from controller；
E. after controller receiving data, data are respectively sent to data memory module and GPRS data transport module to deposit
Store up and transmit；
F. GPRS data transport module is started, every piece of module is first configured before first use, and destination address is set to long-range host computer
A certain port address under IP address, each module correspondence a port number, sends data；
G. judge visibility scale, if threaten traffic safety, if reaching early-warning conditions, start the warning that module is locally displayed
Lamp or warning sign, start phonetic alarm；If being not reaching to early-warning conditions, return to step b；
H. while starting GPRS data transport module, GPRS data transport module sends data to long-range host computer, fortune
Row monitoring interface；
I. port information is detected, and reads data；
J. decoded packet data, isolates the data that each sensor is detected, and deliver to display control progress data display；
K. decided whether to issue warning information by Surveillance center's professional's artificial judgment；
Wherein, judge visibility scale, threaten traffic safety to reach that early-warning conditions are specifically included：Step（1）When not starting light source,
Respectively in dark situation and under having a luminous environment, the bias light illumination of current spatial is detected, X is recorded as；
Step（2）When starting light source, be delayed some seconds, in order to which transmission signal is stable, respectively with step（1）Corresponding dark situation
And have scattering illuminance that now correspondence position is detected under luminous environment, be recorded as Y；
Step（3）X, Y are made the difference, i.e. Y-X, obtain difference, threshold of visibility is judged according to size of the difference；
Step（4）Repeat above step（1）To step（3）, realize continuous measurement；Difference is in 1-2 unit of illuminance, it is believed that fogless
Or mist, without early warning；3-4 units think to have mist, it is necessary to early warning；More than 5 unit of illuminance think there is a mist or doubtful group
Mist is, it is necessary to early warning.
2. a kind of execution method of the monitoring and warning system of expressway fog according to claim 1, it is characterised in that：
The distance of light source and integrated digital the light-intensity test chip is 50-60cm.
3. a kind of execution method of the monitoring and warning system of expressway fog according to claim 1, it is characterised in that：
The light source is 5V LED white light sources.
4. a kind of execution method of the monitoring and warning system of expressway fog according to claim 1, it is characterised in that：
The sensor assembly includes humidity sensor and air velocity transducer and wind transducer and atmosphere pressure sensor.
5. a kind of execution method of the monitoring and warning system of expressway fog according to claim 1, it is characterised in that：
It is described that any one that module is 24V red green warning lamp or electronic caution board is locally displayed.
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| CN112150847B (en) * | 2020-09-25 | 2021-11-05 | 云道图(山东)智能技术有限公司 | Expressway agglomerate fog accurate warning and inducing system and method based on Internet of vehicles |
| CN115662149B (en) * | 2022-12-13 | 2023-03-10 | 合肥远捷信息技术有限公司 | Information system based on highway group fog early warning management and control |
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| ITTO20030770A1 (en) * | 2003-10-02 | 2005-04-03 | Fiat Ricerche | LONG-DETECTION DETECTOR LONG ONE |
| JP4604103B2 (en) * | 2008-03-31 | 2010-12-22 | トヨタ自動車株式会社 | Intersection line-of-sight detection device |
| CN101859492B (en) * | 2009-04-07 | 2012-07-04 | 武汉大学 | Expressway weather monitoring system |
| CN202066787U (en) * | 2011-05-14 | 2011-12-07 | 浦国荣 | Atmosphere visibility detection device |
| CN202275513U (en) * | 2011-09-20 | 2012-06-13 | 浙江大学城市学院 | Wireless network speedway auxiliary induction system based on GPRS/CDMA |
| CN103295401A (en) * | 2013-06-10 | 2013-09-11 | 中山市拓维电子科技有限公司 | Road surface weather condition monitoring system |
| CN103413442B (en) * | 2013-07-30 | 2015-09-16 | 重庆交通大学 | Based on expressway fog early warning system and the method for early warning of the monitoring of intervisibility distance |
| CN203351037U (en) * | 2013-08-08 | 2013-12-18 | 张文嘉 | Expressway agglomerate fog pre-warning system |
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