CN104200648A - Road section average travelling time calculation method based on electronic license plate - Google Patents
Road section average travelling time calculation method based on electronic license plate Download PDFInfo
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- CN104200648A CN104200648A CN201410415346.8A CN201410415346A CN104200648A CN 104200648 A CN104200648 A CN 104200648A CN 201410415346 A CN201410415346 A CN 201410415346A CN 104200648 A CN104200648 A CN 104200648A
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Abstract
The invention discloses a road section average travelling time calculation method based on an electronic license plate. The method includes that an electronic license plate is installed on each vehicle, and an electronic license plate card reading device is installed at the position of an entrance/exit of a road. When vehicles pass through the card reading device, the card reading device reads the electronic license plate of each vehicle and transmits the read electronic license plate, the reading time, the reading position and other information to a center server, and the center server removes vehicle samples with the travelling time obviously difference from the average travelling time according to the read information of the vehicles, and comprehensively calculates the average traveling time of the road section in multiple directions. Compared with travelling time calculation based on an electronic license plate method, the method has the obvious advantages of low cost and high accuracy. Reading of the electronic license plates is not affected by weather and illumination, the problem of low detection accuracy caused by factors such as the weather and the illumination when a video mode is adopted to conduct license plate recognition is solved, and shortest travelling time calculation can be conducted accurately.
Description
One, technical field
The present invention relates to intelligent transportation field, particularly a kind of road-section average computing method hourage based on electronic license plate.
Two, background technology
Along with the increase of automobile, urban traffic blocking is on the rise, and still, the traffic flow distribution of urban road exists imbalance, usually occur that segment path blocks up very much, and another part road traffic is still very unimpeded.Traffic trip person is in the time selecting line road, owing to cannot knowing the jam situation of that road, can only by virtue of experience select line road or pass through navigation selection generic line, if can know the jam situation of road, know the average hourage in section, just can implement shortest time turn-by-turn navigation.
Road-section average computing method hourage mainly contain two kinds at present, a kind of Floating Car computing method that adopts, the another kind of car plate method of identification that adopts.Floating Car computing method mainly by installing GPS device on special car, read the GPS positional information of special car by centring system, determine that vehicle moves the time spending in section, adopt Floating Car to calculate the real-time of hourage relatively good, but because GPS is mounted on bus or taxi, the operation of these vehicles has singularity, especially when bus travels on dedicated bus lanes, it adopts GPS to determine to have limitation the hourage in section, and accuracy is lower.At present the another kind of method of calculating road-section average hourage is that high-definition camera is installed on section, by capturing car image, adopt image recognition technology to carry out the number plate identification of vehicle, utilize number plate to identify and determine that a same number plate car, in the time of diverse location, then calculates the average hourage in section by many cars.Adopting license plate recognition technology to calculate road-section average hourage is the previous Main Means of order, but car plate identification need to be set up a large amount of cameras and light compensating lamp on urban road, not only construction cost is high, and car plate identification is subject to the such environmental effects such as illumination, and accuracy can reduce.
Based on above reason, the present invention adopts electronic license plate is installed on vehicle, by the import and export position at road, electronic license plate reader device is installed, in the time that vehicle passes through reader device, reader device is read the electronics number plate of vehicle, and by the electronic license plate reading, read the time and read the communications such as position to central server, central server is according to the information of many cars reading, COMPREHENSIVE CALCULATING goes out the average hourage of section multiple directions.
Three, summary of the invention
The object of the invention is to calculate road-section average for current employing floating car technology and have some limitations hourage, cause accuracy not high; There is the deficiency that construction cost is high in the calculating that adopts number plate of vehicle recognition technology based on video camera to carry out road-section average hourage, a kind of new road-section average computing method hourage are provided.This method can not only accurately be calculated hourage on section, can also calculate the delay time at stop of crossing all directions, and the calculating that makes road-section average hourage more accurately and science.
The object of the invention is to reach like this: the present invention adopts electronic license plate is installed on vehicle, electronic license plate reader device is installed in import and export position at road, in the time that vehicle passes through reader device, reader device is read the electronics number plate of vehicle, and by the electronic license plate reading, read the time and read the communications such as position to central server, central server is according to the information of many cars that read, each sample vehicle journeys time and average hourage are compared, reject hourage obviously than the vehicle sample that has larger difference average hourage, COMPREHENSIVE CALCULATING goes out the average hourage of section multiple directions.
Electronic license plate reader device is installed in the described import and export position at road, according to no signal control right-angled intersection be provided with two kinds of different situations of signal controlling lamp right-angled intersection electronic license plate reader devices are installed.
Described central server is according to the information of many cars that read, and be provided with signal controlling lamp according to crossing, road and do not have two kinds of different situations of signalization control lamp to calculate average hourage the average hourage that COMPREHENSIVE CALCULATING goes out section multiple directions.
The described installation that electronic license plate reader device is installed at no signal control right-angled intersection, be 4 directions of right-angled intersection entrance reader device is installed respectively, the installation site of reader device antenna is from 10 meters of stop lines.
Describedly in 8 directions of turnover that are provided with signal controlling lamp right-angled intersection, electronic license plate reader device is all installed, the installation site of reader device is arranged on from 20～50 meters of of stop line reading the reader device antenna that enters crossing vehicle, sail out of the vehicle at crossing, read the reader device antenna that sails out of crossing vehicle and be arranged on from 10 meters of of stop line.
The described right-angled intersection situation according to no signal control lamp is calculated average hourage: be according in certain hour section, calculate correct read electric license plate number vehicle by the averaging time in section, in the time of the each road-section average of calculating hourage, calculating once every 1 minute, is by the vehicle of reader device in first 5 minutes of current computing time and calculate selected vehicle.
Described according to the account form that has signal controlled junctions road-section average hourage be included in average running time on this section, in the average queuing at crossing by mean transit time three parts of time, downstream road junction, be divided three classes by the mean transit time of downstream road junction: craspedodrome direction hourage, the direction of turning right hourage and the direction hourage of turning left.
The calculating of the average running time on section is the time from outlet reader device installation site, crossing, upstream to this section of distance in downstream road junction entrance reader device installation site; Crossing computing method hourage are calculated with turning left keeping straight on, turning right respectively; No matter calculate road-section average hourage or the average hourage of crossing all directions, it is all the average hourage of calculating certain interval section, its computing method are consistent, and before agreement, point is for entering interval section vehicle detection point, and rear point is for sailing out of interval section vehicle detection point:
1), first obtaining current time sails out of all vehicle license plate information that the rear some reader device in interval section read in first 5 minutes and passes through the time;
2), then, in the data that read at the front some reader device that enters interval section, search and within the scope of certain hour, pass through vehicle consistent with rear point-like electron license plate number in vehicle data storehouse, and using the vehicle satisfying condition as initial Sample Storehouse, initial sample vehicle number is set as K;
3), each initial sample vehicle is used by the time of rear point and deducted and be designated as t by the time of front point
i, calculate front arrive rear point initial average hourage:
4), compare the t of each sample vehicle
ivalue and T
1difference, to judge that whether this value effective, if
this sample vehicle is cancelled from initial Sample Storehouse, K value deducts 1; If t
i>2T
1, this sample vehicle to be cancelled from initial Sample Storehouse, K value deducts 1;
5) calculate residue sample vehicle average hourage:
Be exactly the current average hourage that rear point is put in section in the past this hourage.
Described according within the scope of rear some place certain hour by finding out the vehicle consistent with point-like electron license plate number before E in vehicle data storehouse, its time range is to be no more than in the past point to 5 times of times of rear normal vehicle operation time.
Described rejecting hourage is the half that the Rejection of samples vehicle journeys time is less than average hourage obviously than the vehicle sample that has larger difference average hourage, and the sample vehicle journeys time is greater than the vehicle sample of a times of average hourage.
Described electronic license plate is radio frequency identification RFID 2.4G, communicates by label antenna and read write line; Described electronic license plate reader device is made up of card reader, antenna and main control system, and card reader is RFID2.4G active long-range card reader, and antenna is dull and stereotyped directional antenna, the corresponding antenna in each track, and a main control system can connect multiple card reader simultaneously.
The present invention has following beneficial effect:
1, electronic license plate reader device equipment cost is low, easy for installation, adopts and carries out calculating hourage based on electronic license plate method, compares to adopt video to carry out car plate identification to carry out calculating hourage, and cost is low, accuracy is high.
2, electronic license plate read the impact that is not subject to weather and illumination, fully solve video mode and carry out car plate identification because of the low problem of the such environmental effects such as weather and illumination Detection accuracy.
3, the hourage of road-section average hourage and crossing all directions can be calculated simultaneously, the calculating of the shortest hourage can be carried out more accurately.
Four, brief description of the drawings
Fig. 1 electronic license plate read schematic diagram.
The connection diagram of Fig. 2 reader device.
Fig. 3 reader device scheme of installation.
Fig. 4 electronic license plate reader device is at the installation site schematic diagram of no signal control right-angled intersection.
Fig. 5 electronic license plate reader device is having the installation site schematic diagram of signal controlling right-angled intersection.
Fig. 6 is that to read the hourage that the E point in accompanying drawing 5 orders to B ＇ be example, concrete implementation step process flow diagram.
Five, embodiment
The electronic license plate that the present invention adopts is based on RFID2.4G active electronic car plate, can be described as again electronic tag, communicates by label antenna and read write line.Electronic tag adopts advanced CMOS 0.18um low-power integrated circuit, meets that size is little, low-power performance design, and working current is about 12～18uA, and voltage is 3V.The design of its ultra low power, makes Intelligent electronic license plate in the situation that not affecting transmitting range, and battery life reached more than 4 years.
In order to ensure that electronic license plate can effectively be read, electronic license plate of the present invention is arranged on pilot dial plate side or front screen conventionally.For each car, the valid data such as photo of the number-plate number that electronic license plate can store car, user profile, purchase ground, time buying, engine number, vehicle.
Electronic license plate read schematic diagram as shown in Figure 1.
The electronic license plate reader device that the present invention adopts is mainly made up of following several parts:
Card reader: adopt RFID2.4G active long-range card reader.To by the vehicle of road, read its electronic license plate information, and information is sent to main control system.
Antenna: selecting antenna is the read signal in order to strengthen card reader, improves distance and accuracy that card reader reads, and the present invention selects dull and stereotyped directional antenna, the corresponding antenna in each track.
Main control system: receive the electronic license plate information that card reader reads, to central server, a main control system can connect multiple card reader simultaneously by communication.
The connection layout of electronic license plate reader device as shown in Figure 2.Wherein, antenna is connected with card reader by copper axis cable, and card reader is connected with main control system by Serial Port Line, and main control system is connected with central server by fiber optic network or 3G/LTE wireless network.
Reader device is installed as shown in Figure 3, and this figure is the scheme of installation in 2 tracks, has 1 electronic license plate card reader in figure, and connects 2 antennas, 1 track of every antenna cover, and card reader is connected to main control system by serial ports.
For city road network, road is divided into turnpike road and non-turnpike road, for turnpike road, conventionally be all provided with signal controlling lamp, when vehicle passes through crossing, running into red light need to wait in line, in the time that the magnitude of traffic flow is large, vehicle queue is longer by the time at crossing, forms the delay of long period at crossing place; And for non-major trunk roads, vehicle flowrate is less, crossing no signal control lamp, vehicle is shorter by the crossing delay time at stop.For this reason, whether the present invention, in the time of calculating road-section average hourage, has signal controlling lamp according to crossing, is divided into two kinds of situations and calculates respectively.
1, the account form of no signal control crossing road-section average hourage
The magnitude of traffic flow of no signal control intersection is less, and vehicle is less in the crossing stand-by period, and vehicle is basically identical working time in crossing all directions, therefore, relatively simpler in the time of calculating road-section average hourage.
Electronic license plate reader device of the present invention in the installation site of no signal control right-angled intersection as shown in Figure 4, is installed respectively reader device in 4 directions of right-angled intersection entrance, and the installation site of reader device antenna is from 10 meters of stop lines.
In the time of calculating road-section average hourage, be actually according in certain hour section, calculate correct read electric license plate number vehicle by the averaging time in section, the present invention is in the time of the each road-section average of calculating hourage, calculating once every 1 minute, is by the vehicle of reader device in first 5 minutes of current computing time and calculate selected vehicle.
In accompanying drawing 4, calculate from crossing 1 to the average hourage in 2 sections, crossing, real transform is for calculating the road-section average hourage of ordering to A ＇ from A point (B point or D point).The reader device of ordering at A ＇, to often, by a car, card reader reads its electronic license plate number, and records passing through the time of this car, and the car information of crossing of this car is sent to central server.Central server is in the time of calculating road-section average hourage, first inquire in first 5 minutes of current time by A ＇ point and complete the vehicle that correct electronic license plate information reads, then, according to upstream A point (B point or D point) locate within the scope of certain hour find out the vehicle consistent with A ＇ point-like electron license plate number in by vehicle data storehouse.The normal vehicle operation Time dependent that this time range is ordered to A ＇ according to A point, is no more than 5 times from A point to the A ＇ point normal vehicle operation time conventionally.And using the vehicle satisfying condition as the statistics initial Sample Storehouse of hourage, use the time of orderring by A ＇ to deduct by the time of A point (B point or D point) on all vehicles in initial Sample Storehouse, calculate the hourage of each sample vehicle from crossing 1 to crossing 2, and calculate the mean value of all initial sample vehicle journeys times.In the time of calculating road-section average hourage, because existing on section, part vehicle stops or other factors, cause its hourage obviously than there being larger difference average hourage, for the accuracy of calculating, this part vehicle need to be rejected, for this reason, each sample vehicle journeys time and average hourage need to be compared, if the sample vehicle journeys time is less than average half, this car exists extremely hourage, and this car is cancelled from sample vehicle; If the sample vehicle journeys time is greater than one times of average hourage, this car exists extremely hourage, and this car is cancelled from sample vehicle.Finally all sample vehicles of removing abnormal hourage of vehicle are calculated to its mean value, and average hourage using this value as crossing 1 to crossing 2.
In the time of calculating road-section average hourage, if section is one-way road, the road-section average that defines forbidden direction is+∞ hourage.
There is the signal controlled junctions road-section average account form of hourage
Road-section average based on there being signal controlled junctions is made up of three parts hourage: average running time on section, the average queuing at crossing by the time with by the mean transit time of downstream road junction.Wherein, queuing time is important time-varying parameter, larger on impact hourage of accurate estimation road-section average.And downstream road junction is according to road conditions, can be divided into again craspedodrome, three directions of turning right and turn left, the mean transit time of each direction is different.
Because the reader device of electronic license plate is easy for installation, cost is lower, therefore, electronic license plate reader device of the present invention in the installation site that has a signal controlling right-angled intersection as shown in Figure 5, in 8 directions of right-angled intersection, reader device is all installed, the installation site of reader device enters crossing and sails out of crossing and there are differences according to reading vehicle, because the vehicle that enters crossing often exists the state of waiting in line, at the vehicle that enters crossing queuing, not to travel by normal speed, for this reason, the present invention is arranged on from 20～50 meters of of stop line reading the reader device antenna that enters crossing vehicle, mounting distance is depending on crossing congestion situation, and the vehicle that sails out of crossing, there is not waiting status, the present invention is arranged on from 10 meters of of stop line reading the reader device antenna that sails out of crossing vehicle.
Reader device is by above mounting means, two parts will be divided into average hourage that ask section, a part is the hourage of vehicle on section and the vehicle hourage at crossing place, wherein comprise that vehicle queue's transit time and vehicle are by the time at crossing the hourage at crossing place, due to crossing place signal lamp three directions that can be divided into craspedodrome, turn right and turn left, therefore, according to the difference of signal lamp direction, be divided three classes the hourage at crossing place: craspedodrome direction hourage, the direction of turning right hourage and the direction hourage of turning left.
On section hourage computing method
In the time calculating on section hourage, its computing method are more consistent with the account form of no signal control crossing road-section average hourage, just there is reader device in the exit at crossing, upstream, therefore be the time from outlet reader device installation site, crossing, upstream to this section of distance in downstream road junction entrance reader device installation site computing time, in accompanying drawing 5, be the road-section average hourage of ordering to B ＇ from E point the average hourage on this section.
In accompanying drawing 5, calculate average hourage the section of ordering to B ＇ from E point, first, the reader device of ordering at B ＇ need read its electronic license plate number by vehicle to each, and record passing through the time of this car, and the car information of crossing of this car is sent to central server, central server is in the time of calculating road-section average hourage, first inquire in first 5 minutes of current time by B ＇ point and complete the vehicle that correct electronic license plate information reads, then, according within the scope of upstream E point place certain hour by finding out the vehicle consistent with B ＇ point-like electron license plate number in vehicle data storehouse.The Vehicle Driving Cycle Time dependent that this time range is ordered to B ＇ according to E point, is no more than 5 times from E point to the B ＇ point normal vehicle operation time conventionally.And using the vehicle satisfying condition as initial Sample Storehouse, use the time of orderring by B ＇ to deduct the time of orderring by E on all vehicles in initial Sample Storehouse, calculate the hourage that each sample vehicle is ordered to B ＇ from E point, and calculate the mean value of all initial sample vehicle journeys times, in the time of calculating road-section average hourage, part abnormal hourage of vehicle need to be rejected, for this reason, each sample vehicle journeys time and average hourage need to be compared, if the sample vehicle journeys time is less than the half of average hourage, this car exists abnormal hourage, this car is cancelled from sample vehicle storehouse, if the sample vehicle journeys time is greater than one times of average hourage, this car exists abnormal hourage, this car is cancelled from sample vehicle storehouse, finally, all sample vehicles of removing abnormal hourage are calculated to its mean value, and the average hourage that point is ordered to B ＇ using this value as E.
Crossing computing method hourage
In the time of the hourage of calculating crossing, the situation that need to arrange according to belisha beacon, calculate with turning left keeping straight on, turning right respectively, computing method hourage of each direction are more consistent with the account form of no signal control crossing road-section average hourage, in accompanying drawing 5, vehicle from crossing 1 to crossing 2 direction runnings, need to calculate the hourage of keeping straight on its average hourage at crossing 2, from B ＇ point to E ＇ point hourage; Turn right hourage, from B ＇ point to C ＇ point hourage; Turn left hourage, from B ＇ point to G ＇ point hourage.
In accompanying drawing 5, calculating the crossing of ordering to E ＇ from B ＇ point keeps straight on hourage, first, the card reader of ordering at E ＇ reads its electronic license plate number to each by vehicle, and record it and pass through the time, and vehicle is crossed to car information send to central server, central server is in the time of calculating road-section average hourage, first inquire current time and complete by E ＇ point the vehicle that correct electronic license plate information reads in first 5 minutes, then, according to B ＇ point place certain hour scope (the Vehicle Driving Cycle Time dependent that this time range is ordered to E ＇ according to B ＇ point, conventionally be no more than 5 times from B ＇ point to the E ＇ point normal vehicle operation time) in by finding out the vehicle consistent with E ＇ point-like electron license plate number vehicle data storehouse, and using the vehicle satisfying condition as initial Sample Storehouse, use the time of orderring by E ＇ to deduct the time of orderring by B ＇ on all vehicles in initial Sample Storehouse, calculate the hourage that each sample vehicle is ordered to E ＇ from B ＇ point, and calculate the mean value of all sample vehicle journeys times, in the time that average hourage is kept straight at calculating crossing, part abnormal hourage of vehicle need to be rejected, for this reason, each sample vehicle journeys time and average hourage need to be compared, if the sample vehicle journeys time is less than the half of average hourage, this car exists abnormal hourage, this car is cancelled from sample vehicle storehouse, if the sample vehicle journeys time is greater than one times of average hourage, this car exists abnormal hourage, this car is cancelled from sample vehicle storehouse, finally, all sample vehicles of removing abnormal hourage are calculated to its mean value, and keep straight on average hourage in the crossing that this value is ordered to E ＇ as B ＇ point.
The average hourage of turning right that calculating is ordered to C ＇ from B ＇ point is consistent average hourage with the craspedodrome of ordering to E ＇ from B ＇ point with the computing method of the average hourage of turning left of ordering to G ＇ from B ＇ point, does not tire out and states at this.
In the time calculating crossing hourage, if a direction is that no through traffic direction, be the calculated as hourage+∞ of crossing of this direction.
No matter calculate road-section average hourage or the average hourage of crossing all directions, can regard the average hourage as calculating certain interval section as, if A point in accompanying drawing 4 is to A ＇ point, E point in accompanying drawing 5 is to B ＇ point, B ＇ point to C ＇ point, B ＇ point to E ＇ point, B ＇ point to G ＇ point, and its computing method are all consistent.Wherein, point is for entering interval section vehicle detection point, and rear point is for sailing out of interval section vehicle detection point.
Calculate hourage that implementation step just orders to B ＇ taking the E point reading in accompanying drawing 5 hourage below as example.
Concrete implementation step is as follows, and workflow is shown in shown in accompanying drawing 6:
1, first obtaining current time sails out of all vehicle license plate information that the rear some reader device B ＇ point in interval section read in first 5 minutes and passes through the time.
2, then, in the data that read at the front some reader device E point that enters interval section, search and in 5 times of time ranges that are no more than from E point to the B ＇ point normal vehicle operation time, pass through vehicle consistent with B ＇ point-like electron license plate number vehicle data storehouse, and using the vehicle satisfying condition as initial Sample Storehouse, initial sample vehicle number is set as K.
3, each initial sample vehicle is used the time of orderring by B ＇ deduct the time of orderring by E and be designated as t
i, calculate E point and order to obtain initial average hourage to B ＇:
4, compare the t of each sample vehicle
ivalue and T
1difference, to judge that whether this value effective, if
this sample vehicle is cancelled from initial Sample Storehouse, K value deducts 1; If t
i>2T
1, this sample vehicle to be cancelled from initial Sample Storehouse, K value deducts 1.
5, calculate residue sample vehicle average hourage:
Be exactly the current average hourage of ordering to B ＇ from E point in section this hourage.
Claims (6)
1. road-section average computing method hourage based on electronic license plate, it is characterized in that: electronic license plate is installed on vehicle, electronic license plate reader device is installed in import and export position at road, in the time that vehicle passes through reader device, electronic license plate reader device is read the electronic license plate number of vehicle, and by the electronic license plate number reading, read the time and read positional information and be transferred to central server, central server is according to the information of many cars that read, each sample vehicle journeys time and average hourage are compared, reject hourage obviously than the vehicle sample that has larger difference average hourage, COMPREHENSIVE CALCULATING goes out the average hourage of section multiple directions,
Electronic license plate reader device is installed in the described import and export position at road, according to no signal control right-angled intersection be provided with two kinds of different situations of signal controlling lamp right-angled intersection electronic license plate reader devices are installed;
Described central server is according to the information of many cars that read, and be provided with signal controlling lamp according to crossing, road and do not have two kinds of different situations of signalization control lamp to calculate average hourage the average hourage that COMPREHENSIVE CALCULATING goes out section multiple directions.
2. as claimed in claim 1 road-section average computing method hourage based on electronic license plate, it is characterized in that: the described installation that electronic license plate reader device is installed at no signal control right-angled intersection, be 4 directions of right-angled intersection entrance reader device is installed respectively, the installation site of reader device antenna is from 10 meters of stop lines;
Describedly in 8 directions of turnover that are provided with signal controlling lamp right-angled intersection, electronic license plate reader device is all installed, the installation site of reader device is arranged on from 20～50 meters of of stop line reading the reader device antenna that enters crossing vehicle, sail out of the vehicle at crossing, read the reader device antenna that sails out of crossing vehicle and be arranged on from 10 meters of of stop line.
3. as claimed in claim 1 road-section average computing method hourage based on electronic license plate, it is characterized in that: the described right-angled intersection situation according to no signal control lamp is calculated average hourage: be according in certain hour section, calculate correct read electric license plate number vehicle by the averaging time in section, in the time of the each road-section average of calculating hourage, calculating once every 1 minute, is by the vehicle of reader device in first 5 minutes of current computing time and calculate selected vehicle;
Described according to the account form that has signal controlled junctions road-section average hourage be included in average running time on this section, in the average queuing at crossing by mean transit time three parts of time, downstream road junction, be divided three classes by the mean transit time of downstream road junction: craspedodrome direction hourage, the direction of turning right hourage and the direction hourage of turning left;
The calculating of the average running time on section is the time from outlet reader device installation site, crossing, upstream to this section of distance in downstream road junction entrance reader device installation site; Crossing computing method hourage are calculated with turning left keeping straight on, turning right respectively; No matter calculate road-section average hourage or the average hourage of crossing all directions, it is all the average hourage of calculating certain interval section, its computing method are consistent, and before agreement, point is for entering interval section vehicle detection point, and rear point is for sailing out of interval section vehicle detection point:
1), first obtaining current time sails out of all vehicle license plate information that the rear some reader device in interval section read in first 5 minutes and passes through the time;
2), then, in the data that read at the front some reader device that enters interval section, search and within the scope of certain hour, pass through vehicle consistent with rear point-like electron license plate number in vehicle data storehouse, and using the vehicle satisfying condition as initial Sample Storehouse, initial sample vehicle number is set as K;
3), each initial sample vehicle is used by the time of rear point and deducted and be designated as t by the time of front point
i, calculate front arrive rear point initial average hourage:
4), compare the t of each sample vehicle
ivalue and T
1difference, to judge that whether this value effective, if
this sample vehicle is cancelled from initial Sample Storehouse, K value deducts 1; If t
i>2T
1, this sample vehicle to be cancelled from initial Sample Storehouse, K value deducts 1;
5) calculate residue sample vehicle average hourage:
Be exactly the current average hourage that rear point is put in section in the past this hourage.
4. as claimed in claim 3 road-section average computing method hourage based on electronic license plate, it is characterized in that: described according within the scope of rear some place certain hour by finding out the vehicle consistent with point-like electron license plate number before E in vehicle data storehouse, its time range is to be no more than in the past point to 5 times of times of rear normal vehicle operation time.
5. as claimed in claim 1 road-section average computing method hourage based on electronic license plate, it is characterized in that: described rejecting hourage is obviously than the vehicle sample that has larger difference average hourage, be the half that the Rejection of samples vehicle journeys time is less than average hourage, the sample vehicle journeys time is greater than the vehicle sample of a times of average hourage.
6. as claimed in claim 1 road-section average computing method hourage based on electronic license plate, is characterized in that: described in described electronic license plate, electronic license plate is radio frequency identification RFID 2.4G, communicates by label antenna and read write line; Described electronic license plate reader device is made up of card reader, antenna and main control system, and card reader is RFID2.4G active long-range card reader, and antenna is dull and stereotyped directional antenna, and the corresponding antenna in each track can connect multiple card reader with a main control system simultaneously.
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| CN107025788A (en) * | 2017-05-17 | 2017-08-08 | 青岛海信网络科技股份有限公司 | A kind of travel time prediction method and device |
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| CN108564793A (en) * | 2018-05-31 | 2018-09-21 | 重庆大学 | A kind of Travel Time Estimation Method based on RFID electronic license plate data |
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