CN102253013A - Transmission method visibility detection device and method applied in field of transportation - Google Patents

Abstract

The invention relates to a transmission method visibility detection device applied in the field of transportation. The transmission method visibility detection device consists of single bodies which can be configured according to requirements and can operate independently and further comprises a pair of detection devices, wherein one detection device transmits detection light beams; the other detection device receives and analyzes attenuation generated by the detection light beams from the transmitting end to the receiving end and then acquires a visibility numerical value accordingly; each configured visibility detection device is provided with interfaces and protocols merged or jointed with data actually measured by other similar visibility detection devices; and a long-distance and high-regional-resolution visibility numerical value representation belt consists of a plurality of detection regions on the basis of the interfaces and protocols which are jointed mutually. In a transmission method visibility detection method applied in the field of transportation by using the device, the visibility numerical value is analyzed by detecting the change of the received light beams; a receiver converts the variable of the detected light beams into the variable of electrical parameters; and the current visibility numerical value is inquired by inquiring the numerical value relationship stored in a visibility control database.

Description

A kind of transmission beam method visibility pick-up unit and detection method thereof that is applied to field of traffic

Technical field

The present invention relates to a kind of transmission beam method visibility detection method and device that is applied to field of traffic, particularly a kind ofly be mainly used in high region resolution visibility detection method and device road traffic and cruiseway field of traffic, that can carry out configuration to visibility numerical value.

 

Background technology

Visibility variation is the optical attenuation phenomenon that light scattering and absorption is caused owing to aerosol, there is clearly definition in World Meteorological Organization (WMO) to visibility, be meteorological optical range (MOR), it expressed specific light source through atmospheric environment decay to predetermined value be the path distance of process be range of visibility.

It mainly is that the visibility state of a monitoring point is surveyed that international existing visibility is surveyed detection method, and infers the visibility variation in a zone in view of the above.This is enough at a zone on the meteorology meaning, but can't satisfy the request for utilization of professional domain at the visibility detection technique on the concrete application meteorology meaning, field of traffic for example, the characteristics of traffic environment are to continue distance, the region span is big, real-time requires high, the lasting variation of the visibility resolution requirement that traffic is continued the region is high, here said visibility continues to change the measured value that resolution not only is meant visibility variation, be meant mainly that traffic covers the segmentation degree of each physical location region in the region and on the region of above-mentioned refinement to the real-time detectability of visibility, this is the visibility pick-up unit of a kind of specialty of needs just.

With regard to detection means, mainly contain scattering method visibility detection technique and transmission beam method visibility detection technique at present.Scattering method is surveyed visibility and is divided into forward scattering method detection technique and back scattering method detection technique again, its ultimate principle is that laser radiation is when tested atmospheric samples, scattering phenomenon will take place in the suspended particles such as gasoloid in the tested atmospheric environment, receiver receives the light that is scattered, its scattered light intensity and visibility are inversely proportional to, airborne suspended particles were few when visibility was high, caused a little less than the scattered light; If suspended particles scattered light intensity at most just can calculate current visibility numerical value by the scattered light intensity that detects receiving end in the atmospheric environment.Scattering method is to infer check point visibility variation numerical value on every side by the visibility numerical value of current detection point, and its real effective actual visibility numerical value only limits to check point; So this type of no region of device visibility resolution can be sayed.

Transmission beam method is that the end at detection zone is provided with a transmitter, the other end is provided with a receiver, meeting is because the suspended particles in the atmospheric environment cause the light intensity of light beam to produce decay to the detection light beam of transmitter emission when arriving receiving end, and the light intensity variation just can obtain visibility numerical value in the fixed range by calculating.Transmission beam method is that the visibility variation that detects in the light path is monitored, and its numerical value and practical application are more approaching.The transmission beam method visibility pick-up unit that is used on the meteorology meaning adopts spacing to detect, owing to need take into account than high-visibility with than the detection of low visibility numerical value, detect light beam and need bigger dynamic range at receiving end, so can only take remote high light intensity mode to obtain between bigger dynamic area, therefore produced an a series of application difficult problem, for example detect aim at (anti-jitter) between light beam and the target area, detection between high-visibility and the low visibility stresses, the problems such as location of visibility variation in the detection segment zone, this also is to cause one of reason that transmission beam method visibility pick-up unit holds at high price, and has also limited the application of transmission beam method visibility pick-up unit simultaneously.

With regard to transmission beam method visibility detection technique, current techniques just must be provided with R-T unit in the position of apart from each other if obtain bigger dynamic visibility sensing range, obtains bigger optics dynamic range with this.The near more then detection difficulty of spacing distance of sniffer is big more when surveying big visibility range, and cost is also high more.

In order to obtain stable testing result, current all visibility detection techniques all require to use special-purpose detection light source, be that scattering method or transmission beam method all require to use special-purpose, constant detection light source, most at present pick-up units also requires to launch and receiving trap is worked under the environment of relative constant temperature, this also has higher requirement to using environment, will realize that the constant temperature to detecting head is not an easy thing under with solar powered environment, this can further raise cost.Publication number CN2757122Y has promptly described and has related to control detection white light LEDs light intensity, optical wavelength, photochromic coloured silk, and camera lens is polluted the emitter of compensation, also comprises the detection of dynamic that is used for separation signal and stochastic error.Its condition element that relates to is many more, and its use cost is just high more, and the scope of application is just restricted more.

Present transmission beam method visibility pick-up unit has all only been considered paired configuration, and can only be responsible for the overall measurement result in the surveyed area, can't realize that region high resolving power visibility numerical value detects.The transmission beam method pick-up unit need can effectively be aimed at the receiver target center of far-end than high stability because of detecting light beam simultaneously, application meeting in road traffic environment is because vehicle operating causes detecting light beam and trembles, the result uses common transmission beam method visibility detection technique can cause detecting light beam disengaging target area because applied environment trembles, so almost do not have transmission beam method visibility pick-up unit in practical application in the road traffic field.

Publication number EP1300672A and AU2002301358A have all described and have adopted said method to measure the optical system of air visibility, and all change the numerical value of inferring visibility based on the luminosity by the fixing light source of measurement parameter.

In addition, the somebody proposes to detect in atmospheric environment by digital camera the spatial resolution and the contrast of the target of various spatial frequency, by the correlativity rule of target detection with visibility, thereby be converted to the method for the visibility under this condition according to the correlativity under the condition separately by the target parameter of actual measurement, see the open CN1580738A of Chinese patent application, it in fact also is based on the transmission condition element and the monitoring method of carrying out, and just the target image is treated as emitter.

Scattering method visibility detection technique that has come into operation at present and transmission beam method visibility detection technique design application direction are weather environment, its optical devices are not applicable to effective design of using under the traffic environment, and above-mentioned visibility pick-up unit is also high to using environment requirement, can't obtain large-scale application in road traffic environment.

Be limited to the restriction of visibility detection technique in the world at present, the visibility variation check point distribution distance of domestic communication field acquiescence approximately is 15 kilometers at interval, that is to say that the visibility variation region resolution of field of traffic is 15 kilometers.Infer the visibility numerical value of universe by the measured value of above-mentioned check point.Obviously, the high-risk visibility variation that may produce the sight line tomography for group's mist of minor diameter, smog etc. uses this assay intervals can't satisfy the traffic environment application requirements.High-resolution omnidistance visibility pick-up unit and technical application also are in blank in the whole industry in the traffic overlay area.For these reasons, also not have at present to solve the actual detected of fog-zone coverage, central point, mobile trend, translational speed, each specific potential energy in the traffic continuation section being seen data such as number of degrees value in the world, the while also can't provide traffic safety strategy targetedly in the low visibility areal coverage.Then must provide high-resolution visibility detection technique and relevant apparatus as need are satisfied to the blind safety control strategy of field of traffic, any single visibility pick-up unit can not satisfy all that high-resolution visibility detects requirement in the large coverage, and market in urgent need is a kind of can be realized the high resolving power visibility in the big overlay area is detected to technology and device that visibility numerical value carries out configuration as required.

Learn that from the known crash analysis that causes because of low visibility vehicle in transit in running at high speed or boats and ships account for more than 90% of low visibility total number of accident because of the accident that runs into sight line tomography incident and caused, and all are serious accident basically.Normally institute causes sight line tomography incident because high density visibility among a small circle descends, and for example high density group mist, denseer smog etc. are wherein especially rolled into a ball the threat maximum that mist constitutes traffic participant in the traffic environment.The physical aspect of group's mist is meant the mist that horizontal diameter is less, the suspension distribution density is higher, group's mist is extensive at the distributed pole of China, because its form is at random, and translational speed is very fast, so all also do not have at present effectively the group's of solution mist to the harm of road traffic, technology and the device that a mist is not effectively detected in the whole world yet.

The subject matter that high resolving power visibility variation detection in region faces at present in the transport solution areal coverage is: need transport solution overlay area whole process, have the short distance visibility detection technique of practicality and the splicing of visibility numerical value, this technology need satisfy traffic environment visibility is detected real-time, wide regional coverage, wide-range scope and high reliability application requirements.It is still blank at present in industry to carry out the method that visibility detects to traffic areal coverage whole process.

 

Summary of the invention

Technical matters to be solved by this invention is, overcome the defective that existing visibility detection technique can not detect omnidistance visibility in the traffic areal coverage, a kind of low cost, wide-range, sliceable a kind of transmission beam method visibility detection method and the device that is applied to field of traffic of detection numerical value are provided.

The present invention obtains the ultimate principle of visibility based on transmission beam method visibility detection mode, but the visibility detection zone of the independent operating of a minimum is made up of a pair of pick-up unit, one of them pick-up unit emission detects light beam, and another pick-up unit receives and the analyzing and testing light beam also obtains visibility numerical value in view of the above from transmitting terminal to the decay that receiving end produced; Detection zone of the present invention is configuration as required, each visibility pick-up unit all possesses interface and the agreement that the measured data of similar visibility pick-up unit with other merges or is connected, and can be with by the visibility numerical value statement that a plurality of detection zones be formed the high region of long distance resolution based on these interfaces that are connected mutually and agreement.

The present invention addresses the above problem the technical scheme that is adopted: a kind of transmission beam method visibility pick-up unit that is applied to field of traffic of each monomer comprises that is detected a beam launcher, one is detected the light beam receiving trap, control and real time data processing module, a communication module, a supply module wherein detects beam emissions and can independently use or common the use according to the different configuration needs with detection light beam receiving trap.The pick-up unit feature is:

A, minimum visibility pick-up unit by two monomers are formed an a kind of transmission beam method visibility detection zone that is applied to field of traffic, the visibility pick-up unit of each monomer all has unique address, unique and an address physical address corresponding or a coordinate are realized the position statement based on above-mentioned address when visibility is explained.Each detection zone comprises and is no less than one and detects beam launcher, and receiving trap has and is no less than one and detects beam receiver.

B, a kind of detection light beam that is applied to the transmission beam method visibility pick-up unit of field of traffic have the variable ability of the light intensity of detection, can launch light intensity and make it to be tending towards optimum detection light intensity district according to the actual detected light intensity closed loop adjustment that receiving end receives, the closed loop adjustment realizes by built-in communication link.

In view of the above,

1. described a kind of transmission beam method visibility pick-up unit that is applied to field of traffic adopts database mode to resolve visibility numerical value.

2. described a kind of transmission beam method visibility pick-up unit that is applied to field of traffic adopts the controlled mode that defocuses to realize a kind of anti-jitter function that can be applicable to field of traffic.

3. described a kind of transmission beam method visibility pick-up unit that is applied to field of traffic adopts the common mode Anti-Jamming Technique to realize the filtration of undesired signal.

4. described a kind of transmission beam method visibility pick-up unit that is applied to field of traffic adopts the filtration of Anti-Jamming Technique realization lock in time undesired signal.

5. described a kind of transmission beam method visibility pick-up unit that is applied to field of traffic adopts electrical quantity database compensation technique to solve and detects beam launcher and receiving device electrical quantity dispersed problem.

6. described a kind of transmission beam method visibility pick-up unit that is applied to field of traffic adopts the data link bridging mode to form array configurations and visibility detection numerical value is carried out configuration and formation visibility statement band.

7. described a kind of transmission beam method visibility pick-up unit that is applied to field of traffic adopts the standard time as the time synchronized source, and visibility numerical value is explained based on the standard time.

8. each a kind of transmission beam method visibility pick-up unit that is applied to field of traffic all has unique address and coordinate address or the physical address coding corresponding with physical address.

9. transmission beam method visibility pick-up unit source lock in time that is applied to field of traffic is satellite time service, the wireless forwarding of electric wave time service or outfield.

Ultimate principle of the present invention is based on transmission beam method visibility detection technique and realizes that a kind of transmission beam method visibility that is applied to field of traffic detects; The implementation method that a kind of transmission beam method visibility that is applied to field of traffic detects is: when the emission light intensity of probe source is determined, receiver receiving sensitivity and dynamic range and change curve is determined, when detection distance between the R-T unit is determined, the change in detection signal that receiver one side is received is only relevant with damping capacity in the detection light source delivering path.

When detection light source emission light intensity is determined, the receiving sensitivity of receiver is determined, detection distance between the R-T unit is determined, when the dynamic change scope of receiving trap and change curve are determined, the electrical quantity variation that the Dynamic Signal that receives on the receiver causes the receiver generation is relevant with visibility numerical value (also can claim extinction coefficient) variation, and the variation numerical value of each electrical quantity can corresponding unique visibility numerical value.

In dynamic range, has corresponding relation between continuous electrical quantity numerical value and the corresponding visibility numerical value, can resolve the dynamic electrical parameter and the relation between the visibility of being surveyed by the visibility pick-up unit and real-time visibility numerical value is provided based on the database that this relation is created, this mode is the database analytical method of visibility.The real-time visibility numerical value of relational database analytical method between electrical quantity that a kind of first-selected use of transmission beam method visibility pick-up unit that is applied to field of traffic of the present invention is preset and the visibility, the inferior equation visibility of selecting is resolved.Add the output that control signal can be realized in the reference mark corresponding with visibility in database again, the reference mark can be provided with in the optional position of the corresponding visibility numerical value of database, and this reference mark is used to start external unit (for example anti-smog device).A kind of transmission beam method visibility pick-up unit that is applied to field of traffic of each detection zone can both be made response to being no less than a real-time visibility variation in reference mark, and the concrete quantity parametrization at reference mark is provided with.

The present invention adopts a kind of bigger visibility testing environment of traffic environment shake that adapts to, detect missing the target that beam jitter causes for overcoming, detection is adopted closely, and sample mode adopts the controlled technology that defocuses of light beam that detects simultaneously, guaranteeing that light intensity difference makes detection light beam hot spot during shake rationally still can cover the target area less than 5% in the hot spot that will detect the projection increasing of light beam target area under the constant prerequisite of light intensity and make target area detection light beam projecting.

Technology difficult point when closely sampling that a kind of transmission beam method visibility that is applied to field of traffic detects is very little between the spot detection dynamic area, and the effective sample signal amplitude of acquisition is very little, and signal to noise ratio (S/N ratio) is lower.For obtaining at first must be at first anti-interference between bigger dynamic area.The present invention uses the common mode Anti-Jamming Technique, removes or reduces undesired signal and improve signal to noise ratio (S/N ratio) to greatest extent by the common mode technology.

The present invention is a kind of visibility pick-up unit of batch configuration in actual applications, detect the beam emissions pipe and all belong to semiconductor devices with detection light beam receiving tube, in production practices, its performance index discreteness can't be avoided, for guaranteeing the detection stability and the validity of visibility pick-up unit, operation parameter compensation technique of the present invention compensates detecting light beam and detecting the light beam receiving trap, compensation is meant electric index and the performance graph that detects R-T unit at the check point that presets, when finding to depart from preset parameter, by compensation way calibration bias.Compensation can be that the electrical quantity compensation also can be to detect numerical compensation, the first-selected use of the present invention detected numerical compensation, it is by making all electrical quantitys that obtain to compensate successful device and parts consistent and have interchangeability at the electrical quantity of each critical control point to the parameter sampling back of omnidistance each check point of device and master sample comparison and by the error compensation mode, each device through calibration all can have the parametric compensation database of propertyization one by one, and it has been described for device or the parts compensation numerical value at each sampled point.

Its testing result each other of the detection of under the visible light wave range different wave length visibility being carried out is discrepant (various different transmission environments to the detection beam attenuation amount of different wave length inconsistent due to), but after each relevant wavelength is examined surely then these to have decided detection be consistent to the testing result of visibility numerical value between long, that is to say, in visible light wave range, no matter use the detection light beam of what wavelength to detect to visibility, prerequisite is that the detection resources of these different wave lengths needs and standard detection environment calibration (fixed inspection), after the calibration then the detection numerical value of different wave length be basically identical.Based on above-mentioned theory, the process of use of the present invention and detection signal coupling is examined later visibility resolution data storehouse surely and is come the detection resources of adaptive different wave length respectively.

The transmission beam method visibility pick-up unit that each on-line operation of the present invention a kind of is applied to field of traffic all by communication module realize each other data transfer and and last level controlling system between data interaction, this can make a kind of transmission beam method visibility pick-up unit that is applied to field of traffic carry out configuration to the visibility numerical value between another is put arbitrarily to arbitrfary point in the detection chain and observe and predict, and also can realize the closed-loop control between the pick-up unit transceiver module.

A kind of transmission beam method visibility pick-up unit that is applied to field of traffic of the present invention uses split-second precision to come the pulsewidth and the bit interval of control detection light beam, based on split-second precision visibility numerical value is demarcated, is realized that common mode is anti-interference, realizes the switching of measuring ability and mode based on split-second precision based on split-second precision.First-selected split-second precision obtains based on satellite time service module or electric wave time service module; The split-second precision of inferior choosing obtains the wireless or wired forwarding based on the outfield time-base unit.

Each a kind of transmission beam method visibility pick-up unit that is applied to field of traffic of the present invention all has unique address of the whole network and physical address, the coordinate address that physical address can be obtained based on the satellite receiver module also can be based on the physical address of artificial setting.

When a plurality of a kind of transmission beam method visibility pick-up units that are applied to field of traffic of the present invention of installation carry out the detection of visibility band to an areal coverage continuously, make if desired have between the pick-up unit interchangeability then in the minimum detection section mounting distance of pick-up unit all equate and to have interchangeability between a kind of transmission beam method visibility pick-up unit that is applied to field of traffic.

The transmission beam method visibility detection method that is applied to field of traffic of device of the present invention, its light beam that receives by detection changes resolves visibility numerical value, receiver will detect the variable that the light beam variable converts electrical quantity to, inquire about current visibility numerical value by the numerical relation that inquiry visibility contrasting data storehouse is stored.

The establishment mode in visibility contrasting data of the present invention storehouse is, one cover is set in the valid analysing range of a standard visibility detector has calibrated electrical quantity and the later device to be detected of fixed test device installation interval distance, with data collecting computer of output terminal access of standard visibility detector; Again the actual measurement variable parameter of device to be detected is also imported data acquisition computer synchronously with the electric variable form.Create a contrasting data storehouse on data acquisition computer, a side data is from the actual measurement visibility numerical value of standard visibility detector, and the opposite side data are from the actual measurement electric variable numerical value of device to be detected; The database real time record is from the data of two pick-up units, based on the identical time electric variable of device actual measurement to be detected and visibility numerical value from the standard visibility detector contrasted and can obtain the visibility numerical value of described band pick-up unit under various electrical quantity states; Different numerical errors between the overlapping during this time measured value exceed then according to the little value of repetitive error 5% with the interior intermediate value of getting.

The described pick-up unit that the present invention is based on the same electrical parameter is shared described database; The pick-up unit of different electrical parameters or the different electrical quantity that detects under light intensity, the spectrum realize that by adaptive different database visibility is resolved or the employing equation directly calculates.

The present invention uses database mode to obtain real-time visibility numerical value and provides the reference mark based on this database, carry out visibility when detecting when using different light intensity/range instead, its range variation is what to carry out under a given multiplying power, makes the detection numerical value between the different ranges change and provide final detection numerical value by calculation procedure; Perhaps, the database of use separate configurations obtains the visibility measured value under the different light intensity.

In sum: the present invention surveys the know-why of visibility numerical value based on transmission beam method visibility detection technique, and the definition of visibility is met the definition of World Meteorological Organization (WMO) to visibility.Adopt the range segmented mode to solve the not enough problem of dynamic range in a kind of transmission beam method visibility detection technique that is applied to field of traffic in the present invention; Adopt the parameter revised law to solve the consistency problem and the field-interchangeable problem of bulk article; Adopt database to resolve the visibility mode and realize electrical quantity parsing visibility problem, adopt simultaneous techniques to solve collaborative work problem and raising signal to noise ratio (S/N ratio), adopt the common mode technology to reduce or eliminate to disturb and improve signal to noise ratio (S/N ratio), adopt segmentation to detect numerical value stack detection mode and solve more longways the interval, territory and carry out high-resolution omnidistance visibility and detect problem.

 

Description of drawings

Fig. 1 is a kind of transmission beam method visibility pick-up unit circuit structure block diagram that is applied to field of traffic;

Fig. 2 is the synthetic a kind of transmission beam method visibility pick-up unit application configuration synoptic diagram that is applied to field of traffic of segmentation;

Fig. 3 is a kind of transmission beam method visibility pick-up unit application configuration synoptic diagram that is applied to field of traffic that head and the tail connect;

Fig. 4 is a kind of transmission beam method visibility pick-up unit testing process process flow diagram that is applied to field of traffic.

 

Embodiment

Referring to Fig. 1-Fig. 4, a kind of transmission beam method visibility pick-up unit that is applied to field of traffic of the present invention obtains the ultimate principle of visibility based on transmission beam method visibility detection mode, detect light beam by a pick-up unit emission, another pick-up unit receives and the decay of analyzing and testing light beam also obtains visibility numerical value in view of the above; Because all having, a kind of each device that is applied to the transmission beam method visibility detection system of field of traffic transmits and receives the function that detects light beam, so each a kind of transmission beam method visibility pick-up unit that is applied to field of traffic all has transmitter unit R and receiving element B, uses a processor CPU, wire communication interface Net, wireless communication module Wnet, satellite time service module T; For ease of describing, present embodiment uses the two detection light source of the single wavelength of 650nm, but visible light wave range can cooperate result of use better with near-infrared light source in actual applications.Receiver uses the photosensitive tube of identical wavelength as sensor, and using in a narrow margin before the receiver, filter filters jamming light source.

The I/O end of CPU connects analog-digital chip D/A, D/A uses 12 AD5320, CPU is by D/A joint detection beam emissions pipe R and R`, gain and come the light intensity of control detection light beam by adjusting D/A, the purpose of adjusting gain is that the light intensity of control detection light beam compensates to realize range conversion and light decay; The base calibration that detects light beam is realized in detecting the light beam exciting circuit and solidifies,, need change the calibration parameter storehouse simultaneously when changing power valve the storage and gain and compensate in the subsidiary calibration parameter storehouse of CPU of the calibration curve that detects light beam by adjusting D/A.

The I/O port of CPU connects modulus conversion chip A/D, and concrete model is AD7705, and the binary channels input end of A/D then detects beam receiver (with detecting the corresponding photosensitive tube of light beam wavelength) B, B` respectively.AD7705 is a kind of 16 double channel A C chips, in be with able to programme, the maximum 128db that gains, full scale voltage 2.5V can satisfy that a kind of transmission beam method visibility that is applied to field of traffic detects accuracy requirement that small-signal is handled and to the requirement of range conversion; The A/D module carries dual input, connect two receivers respectively, this No. two receiver forms the common mode input mode, its principle is: when no signal is imported, the interference signal amplitude that two receivers receive equates, phase place is opposite, and the signal subtraction that two receivers are received can be realized the common mode anti-noise.When detection signal was imported, its receiver produced uneven, and this unbalanced signal can not be cancelled, and detection signal is detected.Working curve is aligned in the calibration parameter storehouse and stores, and compensation realizes by adjusting gain.Need to change simultaneously corresponding calibration parameter database data when changing receiving tube.

Present embodiment CPU model is ARM7, resolve required database of visibility and T-R tube calibration parameter storehouse and realize (for example SD card etc. can plug data card), be loaded with the memory device of correspondence database when the needs change way of output or when resolving precision or changing T-R tube by replacing or the reservoir of parameter library is realized based on the additional reservoir in outside.

CPU also connects digital wireless module Wnet by port, and embodiment Wnet model is CC2530, and serial ports Net carries port based on ARM and realizes.Present embodiment detects light beam 650nm transmitter and uses 10mW technical grade laser module, the 650nm receiver module that the 650nm receiver uses the Shenzhen special photoelectricity of Buddhist development corporation, Ltd. to produce.A kind of transmission beam method visibility pick-up unit circuit structure that is applied to field of traffic is seen Fig. 1.

Need to prove, the first-selected in actual applications double-wavelength light source that uses uses 650nm ruddiness as probe source daytime, uses the near infrared detection light beam of 940nm evening, connected mode is the same with single wavelength light source, only needs to increase the receiving tube of supporting ADC of a cover and configuration corresponding wavelength again.The identification in daytime and evening is benchmark based on ephemeris with the Sunrise and Sunset times.The detection light beam that uses different wave length is in order to obtain higher detection signal-to-noise ratio and the minimizing interference to vehicle in transit, still is the technological means of mutual verification simultaneously.

The ADC chip that uses in the present embodiment, wireless communication module, CPU, 650nm detect light-beam transmitter, and 650nm detects beam receiver and is known technology, does not repeat them here.

Fig. 2 has described the synthetic a kind of transmission beam method visibility pick-up unit application configuration synoptic diagram that is applied to field of traffic of segmentation, wherein V is a kind of transmission beam method visibility pick-up unit that is applied to field of traffic, Li detects light beam, and Wnet is a digital wireless network, and Net is a cable network.Usually use wireless networking during use in the outfield, Net is only as be connected use with host computer.As can be seen from the figure, detection is divided into two sections, and the distance between interior two pick-up units of present embodiment section is 20 meters; Distance all can in the data communication coverage between section and the section.This pattern is obtained length apart from visibility numerical value by the segmentation accumulate mode, is characterized in that the numerical value between each detection segment need be realized configuration by data network, and visibility numerical value can't be detected in the space between the segmentation.

Fig. 3 has described a kind of transmission beam method visibility pick-up unit application configuration synoptic diagram that is applied to field of traffic that connects from beginning to end, wherein V is a kind of transmission beam method visibility pick-up unit that is applied to field of traffic, Li detects light beam, and Wnet is a digital wireless network, and Net is a cable network.As can be seen from the figure, detecting light beam connects from beginning to end and continues to detect, in the present embodiment between any two adjacent pick-up units the distance be 20 meters, this pattern adopts continuation mode to obtain omnidistance visibility numerical value, be characterized in not having the space in the detection band, can carry out seamless detection omnidistance visibility.

Fig. 4 is a kind of transmission beam method visibility pick-up unit testing process process flow diagram that is applied to field of traffic, described the testing process of a pick-up unit to visibility.

The method that visibility detects:

A kind of transmission beam method visibility pick-up unit that is applied to field of traffic is to change by the light beam that detection receives to resolve visibility numerical value, and receiver will detect the variable that the light beam variable converts electrical quantity to.In the present embodiment from the electrical quantity variable to the linking between the visibility numerical value with resolve and to realize by the query conversion database.In simple terms, when determined to detect the light beam luminous intensity, determined receiver receiving sensitivity, determined the dynamic changing curve of receiver and acquiescence curve consistance, determined the signal to noise ratio (S/N ratio) of detection signal after, and determined to detect after the distance, each visibility numerical value all can corresponding unique electrical quantity that receiver receives; When not needing the graded numerical value of visibility whole process, several electrical quantity sensitive spots that so a kind of transmission beam method visibility pick-up unit that is applied to field of traffic only need be provided for controlling in real time can be configured for antifog visibility sensor; Then only need set up a complete database can inquire about current visibility numerical value by electrical quantity to omnidistance if desired visibility numerical value.

Lookup table mode obtains visibility numerical value: the establishment in visibility contrasting data storehouse (database mode realizes the parsing to visibility) mode is: a cover is set in the valid analysing range of a standard visibility detector has calibrated electrical quantity and the later a kind of transmission beam method visibility pick-up unit that is applied to field of traffic of fixed test device installation interval distance, the output terminal of standard visibility detector is inserted a data collecting computer, a kind of actual measurement variable parameter (electric variable) that is applied to the transmission beam method visibility pick-up unit of field of traffic is also imported data acquisition computer synchronously, on data acquisition computer, create a database, one side data is from the actual measurement visibility numerical value of standard visibility detector, the opposite side data are from a kind of electric variable that is applied to the transmission beam method visibility pick-up unit of field of traffic, database will write down the data from two pick-up units automatically, based on the identical time a kind of electric variable of the transmission beam method visibility pick-up unit actual measurement that is applied to field of traffic and visibility numerical value from the standard visibility detector are contrasted and to obtain a kind of visibility numerical value of transmission beam method visibility pick-up unit under various electrical quantity states that is applied to field of traffic, different numerical errors during the employing between the overlapping measured value exceed then according to the little value of repetitive error 5% with the interior intermediate value that reaches.A kind of transmission beam method visibility pick-up unit that is applied to field of traffic based on the same electrical parameter can be shared this database, and a kind of transmission beam method visibility pick-up unit or different electrical quantity that detects under the light intensity that is applied to field of traffic of different electrical parameters can realize that visibility is resolved or the employing equation directly calculates by adaptive different database.Present embodiment uses database mode to obtain real-time visibility numerical value and provides the reference mark based on this database, carry out visibility when detecting when using different light intensity (range) instead, its range variation is what to carry out under a given multiplying power, can make the detection numerical value between the different ranges change and provide final detection numerical value by program, also can use the database of separate configurations to obtain visibility measured value under the different light intensity.

The solution of anti-interference problem: because present embodiment a kind of is applied to red laser that the detection signal of the transmission beam method visibility pick-up unit of field of traffic uses the 650nm wavelength as probe source, the undesired signal of above-mentioned wave band is very abundant at occurring in nature.Simultaneously, because of a kind of transmission beam method visibility pick-up unit that is applied to field of traffic is a kind of a kind of visibility detection technique that is applied to field of traffic based on the transmission principle, at transmission visibility detection range, the sending and receiving end near more then signal to noise ratio (S/N ratio) of distance is low more, and detection difficulty is also high more.Conventional filtering mode is to increase the arrowband filter at receiving end, but in a kind of transmission beam method visibility that is applied to field of traffic detects only lens can not satisfy the requirement that improves signal to noise ratio (S/N ratio).

Column selection of the present invention four kinds of methods that improve signal to noise ratio (S/N ratio)s, can use simultaneously also and can use respectively, present embodiment all uses these the four kinds methods that improve signal to noise ratio (S/N ratio)s:

A, common mode anti-noise technology: on a kind of transmission beam method visibility pick-up unit that is applied to field of traffic two identical receiver sensors have been installed at least, its physical condition unanimity, receive direction is different, and the sensor on the receiver is by calibration, and the optics receptivity is approximate.The receiver light path is parallel to the ground, and the receiver of two different directions is all parallel to the ground, and just receive direction differs 180 degree or 90 degree.Under no one-sided situation of blocking, the environmental light intensity of the stable equilibrium that two receivers are received when do not have detecting light beam be similar to (wherein stablely be meant no jump signal, usually the Strength Changes of signal such as light is comparatively unexpected, simultaneously one-sidedly suffers sunshine etc. can produce strong unbalanced light intensity during unexpected undesired signal).The light intensity amplitude that receive on two receiving sensors this moment is equal substantially, and the signal that two receivers are received directly subtracts each other the interference that can remove environment light source.But discerned and reject for jump signal and one-sided unbalanced equal signal service routine, effectively detection signal is then by reference time with shake hands and can effectively discern.

B, receiver and transmitter all carry out synchronous working based on high precision time, so that make the discrete receiving trap of installing can obtain the high-precision test light beam work period.When the detection light beam is synchronoused working with receiver with high-precision dutycycle and bit interval.When transmitting terminal is not launched the detection light beam, receiver can seize by still exist after the common mode on a small quantity can not common mode the residual interference signal, this moment, this signal amplitude can be made a mark because the detection light beam does not shine then, when detecting the light beam irradiates receiver, receiver can be exported the composite signal of superposeed detection signal and undesired signal, deducts composite signal after the residual interference signal amplitude weighting equilibrium with several times and can obtain an approximate pure detection signal.Present embodiment uses this technology; In the time can not obtaining effective common mode (for example one-sided have interference source, one-sided receiving trap damage etc.), the noise amplitudes of elder generation mark non-detection time, the mark amplitude of detection signal that superposeed again, the two is directly subtracted each other to remove known disturbances, this method can produce the detection error, need compensate, compensation realizes by program.

If C considers only to use and a kind ofly detects light intensity then need to consider detection demand (needing the highest light intensity of use) the minimum visibility state under, this signal intensity that receiving end is obtained when a kind of transmission beam method that is applied to field of traffic detects under than the high-visibility environment is very big, easily enter state of saturation, otherwise then can not satisfy high ambient brightness or blind detection demand.Obviously a kind of single light intensity and receiving sensitivity are difficult to satisfy closely gamut detection needs.For this reason, the mode that a kind of transmission beam method visibility pick-up unit that is applied to field of traffic has adopted automatic range to change, mainly be: the detection light beam light intensity that makes emission in detection zone all the time is a little more than the environmental light intensity of receiving on the receiver, and make and detect light beam light intensity intermediate level position in receiver linear work district, to increase noise dynamic range when; The quantitative amplification of the small-signal of seizing being carried out controllable gain is to obtain the check and analysis signal level of enough amplitudes.Above-mentioned measure can obtain a detection signal than high s/n ratio when visibility is higher; Then improve the emission light intensity by close-loop control mode and make receiving end remain at best workspace when visibility reduces, anti regular gains by the reduction transmitting terminal and obtains bigger total range scope; Can pass through programe reduction based on the detection variable that obtains after a definite enlargement factor or the definite emission light intensity, the conversion between range also can be unified to launch and the linear expression of realization by program.Closed-loop control is meant that the sending and receiving end is mutual by built-in data link realization, and shaking hands is meant between two devices by communication link realization replying a certain requirement.

D, the light intensity that detects light beam in physical environment are compared many times with environmental light intensity and can be weaker than environmental light intensity, the environmental light intensity that receives when receiver is when detecting the light intensity of light beam, detection signal will " be flooded " in undesired signal, and the identification difficulty can be very big.So need on physical arrangement at first to guarantee that surround lighting is attenuated to greatest extent; " deep throat " structure that this installs based on level and the physics anti-interference structure of filter composition in a narrow margin; this similar is in osculum loudspeaker, and receiving sensor is installed in the rear portion, and postmedian is installed filter.Hydraucone is as far as possible little, and horn chamber inside is coated with light-absorbing coating, and the embodiment hydraucone only stays the incident angle less than 2 degree, reduces ambient light interference physically to greatest extent.

A kind of transmission beam method visibility pick-up unit detection resources calibration that is applied to field of traffic:

The detection light beam light intensity that pick-up unit receives by analysis changes and obtains visibility numerical value, and its light intensity variation meeting is expressed in the electrical quantity mode.Electrical quantity calibration mainly is to realize the detection light beam on all a kind of transmission beam method visibility pick-up unit that is applied to field of traffic and the consistance of receiver.Detect the convex lens focus that light beam uses adaptive this wavelength, the 650nm red laser that embodiment uses 30 meters apart from the time hot spot approximately be controlled at about 25～35 centimetres (owing to have bigger vibrations in the road traffic environment in receiver target area diameter projected, transmitting terminal is just big more to the big more focus point shake that then causes because of vibrations of distance of receiving end, the increase hot spot can make among a small circle, and shake can not influence the detection effect, if being installed, the basis of column can suitably increase hot spot diameter projected) than pine, brightness disproportionation weighing apparatus degree is controlled within 5% between the interior each point of hot spot, all transmitters all need to calibrate light intensity and calibration hot spot equilibrium degree, the present embodiment calibration sequence is at first to calibrate the hot spot equilibrium degree at 30 meters, and the hot spot equilibrium degree is realized by mirror focusing and scattering film; Light intensity detects based on spacing calibrating under the closed environment of a collimation, closed environment is that the length of a collimation is 20 meters, diameter is not less than 25 centimetres black plastic pipe, to after the dedusting in managing in two side seals, reserve circular hole in the middle of the port sealing thing and also use rubber to hide, but this environment emulation is not less than 16 kilometers visibility, if reduce intraductal atmospheric pressure to bleeding in managing then the emulation distance is higher, but do not need in the present embodiment to be higher than 5 kilometers environment, so do not need to bleed.When carrying out the light intensity initial calibration, remove the rubber shielding cover, to detect light-beam transmitter and insert in the detector tube and use anchor clamps to fix, make it parallel, opposite side installation code metering receiver with pipeline, the detection light beam that uses the transmitter emission to continue, receiver one side can receive the detection light beam of transmitter emission, and the luminous intensity of adjusting transmitter can obtain a benchmark light intensity value to standard area, all transmitters are all calibrated based on this mode, error less than reference value 5% with interior be qualified.This can make whole transmitters all realize unified benchmark luminous intensity, carry out dynamic light intensity calibration then, embodiment is divided into 64 grades with omnidistance light intensity, and (with the light intensity is to divide foundation, the corresponding electrical quantity that drives of record), corresponding numerical value under 64 grades of light intensity of receiving end mark, error correction numerical value is by calibration parameter storehouse corresponding record; Finish the transmitter that changes the outfit and calibrated after the transmitter calibration, make and calibrate receiver in the same way, enable to finish the calibration of benchmark receiving sensitivity; And then receiver carried out between dynamic area harmonious calibration, mode is to use 64 grades of light intensity of standard to launch step by step and make receiving end all consistent with the standard receiver in each level at the transmitter transmitting terminal, error is adjusted by the receiver gain and is compensated, calibrate for error and count corresponding calibration parameter storehouse, in fact measured device each grade in application also has up and down the performance graph between two end points not have detected, so the classification performance graph consistance between the detailed rules and regulations measured device more is also just good more, the range of 8 grades of light intensity can satisfy the field of traffic request for utilization in actual applications, when precision prescribed is higher, can satisfy application requirements by increasing the hierarchical detection degree.This process is used to detect the consistance of receiver under different gradients detection light intensity, this consistance also can be revised (realizing the parameter correction by photosensitive tube is added extra correction circuit) based on the electrical quantity compensation way in actual use by the photoreceptor electrical quantity decision of receiver; These corrections can be implemented after need demarcating the detection compensation point in the graded.Present embodiment is abandoned the receiving sensor (photosensitive tube) that uses the performance graph grave fault to close coherence request.Detect the initial light intensity value of light beam determine with testing result irrelevant, but the light intensity initial value be determined and with then can not change after visibility resolution data storehouse is related.

Detect the attenuation compensation and the redundancy of light beam:

As the part of alignment mechanism, present embodiment detect light beam and receiver outside head's time can decay after using, the factor that causes decaying mainly contains external field environment pollution, the luminous light intensity attenuation of detection beam emissions.This can cause detecting error and strengthen.Light decay is a process of development gradually, and present embodiment uses the multiple gun technology to reduce error.Its method is to dispose two similar detection light beams at least at transmitting terminal, one is the light beam that detects commonly used, another detects light beam for reserve, parametrization is set a comparison cycle, alternately start when comparing the cycle and mainly detect light beam and reserve detects light beam, receiver detects difference and obtains light decay and penalty coefficient, reduces the error that light decay causes by compensation way; When main detection light beam broke down, reserve detected light beam and takes over the main light beam that detects automatically, to increase redundancy; In addition, also can infer light decay and it is added the calibration parameter storehouse by continuous working period.

Anti-interference and the fault-tolerant design of physical arrangement:

When using the visible light wave range light beam as detection source, usage level focuses on forward emitted mode emission detection light beam (forward direction of indication is meant install consistent with vehicle heading in road environment) here, it is consistent with vehicle heading that detect the beam emissions direction this moment, can avoid detecting the negative effect of light beam to safe driving; When using the infrared band light beam as detection source, usage level focuses on the back to radiation pattern emission detection light beam (indication is back to being meant that contrary vehicle heading is installed in road environment) here, can avoid this moment car light to detecting the interference of data.Each a kind of transmission beam method pick-up unit that is applied to field of traffic has all possessed the detection beam emissions simultaneously and has detected the light beam receiving function, and R-T unit also all is simultaneously in work, so the conversion reiving/transmitting state can be realized based on program.

The horn-like reception cavity that the embodiment receiving element uses median diameter to be not more than 3 centimetres receives and detects light beam, 160 centimetres of reception cavity total lengths present 2 degree angle flares, and are pre-large post-small, receiving sensor (photosensitive tube) is installed in the reception cavity rear portion, is coated with light absorbing material in the reception cavity and disturbs to reduce.Above-mentioned design can basic guarantee 2 degree incident angles direct projection jamming light source in addition be blocked in outside the receiver to greatest extent; Aims at by the semiconductor laser emitted laser Shu Jinhang that focuses between transmitter and the receiver, allow transmitter and receiver to have 2 to spend with interior alignment error (optical alignment can be finished the outfield installation by the detection light beam acquiring receiving end target area that carries between two pick-up units).

Communication between a kind of transmission beam method visibility pick-up unit that is applied to field of traffic:

Each a kind of transmission beam method visibility pick-up unit that is applied to field of traffic all comprises two kinds of communication routes, a kind of is main communication route, wireless telecommunications based on the zigbee technique construction, present embodiment is that CC2530 is as communication module, effectively covering radius is about 75 meters, can form between a kind of transmission beam method pick-up unit that is applied to field of traffic and carry out mutual link, about the about 160K of the effective transmission bandwidth in outfield, closed-loop control realizes based on this link; Second kind is based on the optical modulation communication that detects the light beam composition, after detection beam emissions and receiving end all increase optical modulation, can constitute unidirectional data and instruction transmission route, and present embodiment does not use.

Each a kind of transmission beam method visibility pick-up unit that is applied to field of traffic has also increased a RS-232 serial line interface on processor, be used for being connected with the outfield field optical fibers.The effect of this interface in system is the effect of " bridge ", and responsible structure is gone up the data channel between level controlling system and the outfield visibility pick-up unit and realized uploading the task (for example enter wireless data link through local device and visit other devices) of data and download instruction.Whether allow remote control terminal to enter the gateway decision that the outfield data chainning is provided with by upper control end.

A kind of transmission beam method visibility pick-up unit that is applied to field of traffic has the function that the outfield directly drives low visibility positive guide system, based on antifog demand, be provided with the storage space that can store control strategy in processor, above-mentioned space can provide real-time online access and strategy change with good conditionsi.

Based on the direct demand for control in outfield, a kind of transmission beam method visibility pick-up unit that is applied to field of traffic is built-in with a system configuration mapping table, the data link that mapping table is expressed total system is formed the address of state and each pick-up unit, initiates once the visit of arbitrary node and accessed based on any one visibility pick-up unit in this mapping table permission system; All can calculate to the visibility numerical value of accumulative total between another pick-up unit based on any one intrasystem pick-up unit of this mapping table, last level controlling system can obtain its duty, running status, real time data by the visit to any pick-up unit, also can adjust the operational factor of pick-up unit based on mutual and visit.

A kind of control that is applied to the transmission beam method visibility pick-up unit of field of traffic:

A kind of processor that is applied to the transmission beam method visibility pick-up unit of field of traffic uses ARM9 in the present embodiment, and the processing power of this processor can satisfy the data processing requirement that a kind of visibility that is applied to field of traffic is detected; Technology such as ARM9, A/D conversion, database, zigbee application belong to known technology, do not repeat them here.

Satellite time service and coordinate obtain:

Present embodiment satellite receiver module uses the CT2010S thick film circuit assembly based on the SIRF chipset, and it can provide time service and coordinate, and it is known technology that satellite-signal receives, and does not repeat them here.

A kind of transmission beam method visibility pick-up unit outfield that is applied to field of traffic is provided with embodiment:

A kind of transmission beam method visibility pick-up unit that is applied to field of traffic is formed a detection zone by two same devices, and a device emission detects light beam, and another device receives and detects light beam.Receiving end in this detection zone is the detection node of this detection zone, and single node visibility numerical value definition place is exactly the detection zone of node position.Each device promptly is that transmitting terminal also is a receiving end in the continuously uninterrupted configuration of a kind of transmission beam method that is applied to field of traffic, detects light beam by the pick-up unit a kind of visibility detection system that is applied to the transmission beam method of field of traffic of formation that joins end to end.Mounting distance between the pick-up unit is decided on external field environment and application requirements, and installation interval scope of the present invention is 12 meters～500 meters, and present embodiment pick-up unit installation interval is 20 meters.The different light intensity that detect are suitable for installation interval distance in the different detection zones respectively.

Present embodiment is a kind of transmission beam method visibility pick-up unit that is applied to field of traffic of highway section configuration at five kilometers, according to antifog requirement and hardware compatibility convention, a kind of configuration space that is applied to the transmission beam method visibility pick-up unit of field of traffic is made as 20 meters one, per 20 meters visibility detection zones of forming a single-unit.

The controlled plant of present embodiment rear end is not accepted the requirement of gradient signal, so present embodiment only provides the outfield opertaing device required parametrization reference mark.The reference mark can be provided with as required, embodiment provides the position, 8 reference mark (8 kinds of different visibility numerical value control signal is down exported) of acquiescence, to support being no less than 8 kinds of antifog guiding control strategies, be respectively: 25 meters, 50 meters, 100 meters, 200 meters, 300 meters.400 meters, 500 meters, 1000 meters visibility values.Above-mentioned some position can be satisfied 8 kinds of different fog-zone boot policy of startup and crashproof tactful requirement respectively.

The visibility testing process:

Present embodiment is a kind of to be applied to detect beam launcher in the transmission beam method visibility pick-up unit of field of traffic and to detect light beam with the 650nm of pulse forward emitted in a narrow margin, the detecting light beam light intensity adds one grade of emission by the environmental light intensity upper limit, for example during environmental light intensity 15000lux, press the emission of 20000lux light intensity, when environmental light intensity surpasses the highest numerical value, by the highest numerical value emission.Whether the light intensity conversion that detects light beam is determined in receiving tube best effort district according to the received signal light intensity by receiving end and pass to transmitting terminal by shaking hands when each emission.

Present embodiment detects the light beam pulse width when ambient light illumination is higher than 5000lux be 100 milliseconds, and the pulse width is 50 milliseconds when being lower than 5000lux, 1000 milliseconds of cycles in recurrent interval.With pulse per second (PPS) lock in time initial value rising edge as start-up time, start detection light beam when for example pulse per second (PPS) begins, close the detection light beam during daytime to 100 millisecond, restart the next light beam that detects, so circulation when the next pulse per second (PPS) after waiting for 900 milliseconds begins.When environmental light intensity is higher than 15000lux or actual measurement visibility and is higher than a kind of this detection segment of the transmission beam method visibility pick-up unit upper limit of detection that is applied to field of traffic, present embodiment is increased to 100000 milliseconds (100 seconds) with sense cycle and detects once, pulse width is still followed 50～100 milliseconds obtaining value method, the detection pulse initiation time remains the pulse per second (PPS) initiating terminal, midfeather 99 seconds.Above-mentioned parameter can self-defined as requested setting.

Receiving end and transmitting terminal synchronous error are less than 5 milliseconds, after the transmitting terminal emission detects light beam, the light intensity that the receiving end synchronous acquisition receives is also compared with the comparison of this light intensity and database and with result and parameter preset, if touch the control threshold value then provide the control signal of correspondence.For example establish electrical quantity 010101 value and be 50 meters of visibility, the back is stable to obtain to be no less than 3 cycles when all being 010101 value when the receiving end sampling detects, and judges that then current visibility is 50 meters.The wherein stable time (cycle) that continues is parameterized, and stable detected value also is a relative value, and error range is provided with parametrization, and the stable detection value that present embodiment is set is meant in positive negative error 5% scope of central value.

A kind of any a pair of pick-up unit that is applied to the transmission beam method visibility pick-up unit of field of traffic is all formed a detection zone, and each detection zone is a detection node in whole detection arrays; Each detection node all has independent and unique detection node coding in detector segments, is the visibility calibration point with the receiver geocoding.

A kind of transmission beam method visibility pick-up unit that is applied to field of traffic of present embodiment is not to touching the data temporary ten (predeterminable) of visibility control threshold value, and the visibility incident of touching the control threshold value then is divided into automatic processing and two kinds of tupes of artificial treatment; Automatically handle is to provide steering order according to preset requirement immediately and incident is uploaded; Artificial treatment is then uploaded incident as requested; When occurring a plurality of incident in the system simultaneously, processing priority is: sequential, event class are preferential to the outermost coordinate after then when identical sequential and event class.

Though the present invention with embodiment openly as above; but it is not in order to limit protection scope of the present invention; any technician who is familiar with this technology, change and the retouching done in not breaking away from design of the present invention and scope all should belong to protection scope of the present invention.

Claims (14)

1. transmission beam method visibility pick-up unit that is applied to field of traffic, it is characterized in that: but form by the monomer of configuration as required and independent operating, it further comprises a pair of pick-up unit, one of them pick-up unit emission detects light beam, and another pick-up unit receives and the analyzing and testing light beam also obtains visibility numerical value in view of the above from transmitting terminal to the decay that receiving end produced; Each visibility pick-up unit of configuration all possesses interface and the agreement that the measured data of similar visibility pick-up unit with other merges or is connected, and is with based on the visibility numerical value statement that these interfaces that are connected mutually and agreement are formed the high region of long distance resolution by a plurality of detection zones.

2. according to the described a kind of transmission beam method visibility pick-up unit that is applied to field of traffic of claim 1, it is characterized in that: each monomer also comprises control and real time data processing module, a communication module, a supply module; Wherein, pick-up unit is minimum forms a detection zone by two monomers, and each monomer all has unique address, and unique and an address physical address corresponding or a coordinate are realized the position statement based on above-mentioned address when visibility is explained; Each detection zone comprises and is no less than one and detects beam launcher, and receiving trap has and is no less than one and detects beam receiver.

3. according to claim 1 or 2 described a kind of transmission beam method visibility pick-up units that are applied to field of traffic, it is characterized in that: the detection light beam of described pick-up unit has the variable ability of the light intensity of detection, can launch light intensity and make it to be tending towards optimum detection light intensity district according to the actual detected light intensity closed loop adjustment that receiving end receives, the closed loop adjustment realizes by built-in communication link.

4. a kind of transmission beam method visibility pick-up unit that is applied to field of traffic according to claim 1 and 2 is characterized in that: described pick-up unit adopts database mode to resolve visibility numerical value.

5. a kind of transmission beam method visibility pick-up unit that is applied to field of traffic according to claim 1 and 2 is characterized in that: described pick-up unit adopts the controlled mode that defocuses to realize a kind of anti-jitter that is applied to field of traffic.

6. a kind of transmission beam method visibility pick-up unit that is applied to field of traffic according to claim 1 and 2 is characterized in that: described pick-up unit adopts a kind of filtration that realizes undesired signal in common mode Anti-Jamming Technique or employing Anti-Jamming Technique lock in time.

7. a kind of transmission beam method visibility pick-up unit that is applied to field of traffic according to claim 1 and 2 is characterized in that: described pick-up unit adopts electrical quantity database compensation technique to solve and detects beam launcher and receiving device electrical quantity dispersed problem.

8. a kind of transmission beam method visibility pick-up unit that is applied to field of traffic according to claim 1 and 2 is characterized in that: described pick-up unit adopts the data link bridging mode to form array configurations and visibility detection numerical value is carried out configuration and formation visibility statement band.

9. a kind of transmission beam method visibility pick-up unit that is applied to field of traffic according to claim 1 and 2, it is characterized in that: described pick-up unit adopts the standard time as the time synchronized source, and visibility numerical value is explained based on the standard time, this standard time source is satellite time service, the wireless forwarding of electric wave time service or outfield.

10. a kind of transmission beam method visibility pick-up unit that is applied to field of traffic according to claim 1 and 2 is characterized in that: each pick-up unit all has unique address and coordinate address or the physical address coding corresponding with physical address.

11. an employing is as the transmission beam method visibility detection method that is applied to field of traffic of device as described in one of claim 1 to 10, its light beam that receives by detection changes resolves visibility numerical value, receiver will detect the variable that the light beam variable converts electrical quantity to, inquire about current visibility numerical value by the numerical relation that inquiry visibility contrasting data storehouse is stored.

12. a kind of transmission beam method visibility detection method that is applied to field of traffic according to claim 11, it is characterized in that: the establishment mode in described visibility contrasting data storehouse is, one cover is set in the valid analysing range of a standard visibility detector has calibrated electrical quantity and the later device to be detected of fixed test device installation interval distance, with data collecting computer of output terminal access of standard visibility detector; Again the actual measurement variable parameter of device to be detected is also imported data acquisition computer synchronously with the electric variable form; Create a contrasting data storehouse on data acquisition computer, a side data is from the actual measurement visibility numerical value of standard visibility detector, and the opposite side data are from the actual measurement electric variable numerical value of device to be detected; The database real time record is from the data of two pick-up units, based on the identical time electric variable of device actual measurement to be detected and visibility numerical value from the standard visibility detector contrasted and can obtain the visibility numerical value of described band pick-up unit under various electrical quantity states; Different numerical errors between the overlapping during this time measured value exceed then according to the little value of repetitive error 5% with the interior intermediate value of getting.

13. according to claim 11 or 12 described a kind of transmission beam method visibility detection methods that are applied to field of traffic, it is characterized in that: the described pick-up unit based on the same electrical parameter is shared described database; The pick-up unit of different electrical parameters or the different electrical quantity that detects under the light intensity realize that by adaptive different database visibility is resolved or the employing equation directly calculates.

14. a kind of transmission beam method visibility detection method that is applied to field of traffic of stating according to claim 11 or 12, it is characterized in that: use the real-time visibility numerical value of database mode acquisition and provide the reference mark based on this database, carry out visibility when detecting when using different light intensity/range instead, its range variation is what to carry out under a given multiplying power, makes the detection numerical value between the different ranges change and provide final detection numerical value by calculation procedure; Perhaps, the database of use separate configurations obtains the visibility measured value under the different light intensity.

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