CN107993452A - Speed-measuring method based on road passage rate on WIFI probes detection highway - Google Patents
Speed-measuring method based on road passage rate on WIFI probes detection highway Download PDFInfo
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- CN107993452A CN107993452A CN201711388402.3A CN201711388402A CN107993452A CN 107993452 A CN107993452 A CN 107993452A CN 201711388402 A CN201711388402 A CN 201711388402A CN 107993452 A CN107993452 A CN 107993452A
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/052—Detecting movement of traffic to be counted or controlled with provision for determining speed or overspeed
Abstract
The invention discloses the speed-measuring method based on road passage rate on WIFI probes detection highway, and in particular to a kind of speed-measuring method of vehicle on expressway, the speed-measuring method include the following steps：Pass through WIFI probe collection WIFI equipment information；The direction of vehicle traveling is judged by the information collected；Reject the information of parallel road vehicle；Reject the information for the equipment that is open to traffic；Judge the jam situation of expressway surface, calculate congestion speed；By the speed that road network is calculated.Technical solution provided by the present invention can exclude the interference of the factors such as parallel road vehicle, passenger stock and congestion in road so that the road average speed of the highway measured is more accurate.
Description
Technical field
The present invention relates to a kind of speed-measuring method of vehicle on expressway, specially detects highway based on WIFI probes
The speed-measuring method of upper road passage rate.
Background technology
With the constantly improve of China's freeway net, highway open so that traffic is more convenient, the energy more
Save, substantially reduce running time of the vehicle between two cities.
However, problem is also following.Travel speed is very fast on a highway for vehicle, easy traffic accident.Due to car
Speed is bigger, and braking distance also can accordingly increase.If front vehicles meet with situation take braking, often follow closely other vehicles because
The too late and front truck that knocks into the back is braked, causes rear-end collision.Therefore the road average speed of measurement freeway network knocks into the back containment
Accident is of great significance.
The content of the invention
The present invention provides the speed-measuring method based on road passage rate on WIFI probes detection highway, the side of testing the speed
It is accurate that method has the advantages that to test the speed.
To achieve the above object, the present invention provides following technical solution:
Based on the speed-measuring method of road passage rate on WIFI probes detection highway, which includes following step
Suddenly：
On S01, the vehicle travelled using the WIFI probe collections that are deployed on highway the id information of WIFI equipment and
By the moment, and be i by wherein numbering the id information that detects of WIFI probes and by the way that set is made constantly, be denoted as set A；
The WIFI probes that numbering is i are one of them in the WIFI probes being deployed on highway, are denoted as WIFI spies
Pin i；
S02, the WIFI probe adjacent with WIFI probes i for WIFI probe i-1 or WIFI probe i+1, WIFI probe i-1 or
Id information that WIFI probes i+1 is detected and by forming set constantly, is denoted as set A1；
Pass through set A and set A1In array judge the moving direction of WIFI equipment, choose the WIFI unidirectionally moved and set
Standby id information and by forming new set constantly, is denoted as set B；
S03, in the set B, reject the id information of the WIFI equipment on parallel with super expressway road and pass through
After moment, set C is obtained；
S04, in the set C, reject the id information of WIFI equipment on same vehicle and by moment array, obtain
To set D；
S05, the road speed for calculating and drawing whole WIFI equipments in set D；
S06, by calculating the road speed between deployment each WIFI probes on a highway, combination obtains
The passage rate of whole road network, the passage rate of the passage rate, that is, vehicle.
Preferably, in step S01, WIFI probes i by the id information collected and passes through the moment every time interval T
It is uploaded to central server, set A is the id information that WIFI probes collect in t time interval and by made by the moment
Set LI, t。
Preferably, in step S02, the WIFI probes numbering of trip adjacent with WIFI probes i and disposed thereon is i+1,
It is denoted as id information that WIFI probes i+1, WIFI probe i+1 collects in t time interval and by the collection made by the moment
Close LI+1, t, id information and pass through the set made by the moment that WIFI probes i+1 is collected in t-1 time interval
LI+1, t-1, id information and pass through the set L made by the moment that WIFI probes i+1 is collected in t-2 time intervalI+1, t-2；
It is present in L at the same time when the id information for the WIFI equipment that WIFI probes i is detected and by the momentI, t、LI+1, t、
LI+1, t-1And LI+1, t-2Shi Ze is denoted as LD by the id information and by forming new set constantlyI+1, i, t, i.e. described in step S02
Set B, DiFor the distance between WIFI probes i to WIFI probes i+1.
Preferably, in step S03, if set LDI+1, i, tIn have the WIFI equipment that quantity is x, and the quantity is x
The id information detected on vehicle is not admitted to
LI+2, t-n, LI+3, t-n(0 ＜=n ＜=3)
In any one set or when being not belonging to above-mentioned two set at the same time, then the vehicle that the quantity is x is rejected, after rejecting
Vehicle newly collection be combined into LKI+1, i, t=LDI+1, i, t- x, i.e. the set D.
Preferably, step S04 includes：
Step S04.1, WIFI equipment close quarters is estimated
In same scan cycle, WIFI probe scannings to the set of WIFI equipment information be denoted as LNI+1, i, t, tf, in K
In the scan period of a WIFI probes, max (LNI+1, i, t, tf) it is WIFI equipment information-intensive area, it is denoted as set LMI+1, i, t；Its
In, tf is the scan period of WIFI probes；
Step S04.2, estimation colleague WIFI equipment set
If there is y WIFI equipment information to appear in set LM at the same timeI+1, i, tWith set LMI+2, i+1, tIn, then it is assumed that this y
WIFI equipment is on same car；If y ＞ 6, from set LKI+1, i, tIn subtract the WIFI equipment information of repetition vehicle, collected
Close LCI+1, i, t, set LCI+1, i, t=LKI+1, i, t- y+1, i.e. the set D.
Preferably, step S05 is specifically included：
When meeting condition：Set LCI+1, i, tElement number be less than M, and set LCI+2, i+1, tAnd LCI+2, i+2, tElement
Number is less than 2*M, then the passage rate on road between the WIFI probes that the WIFI probes that numbering is i+1 are i to numbering is set
For this section of high speed speed limit；
When meeting condition：Set LCI+1, i, tElement number be more than or equal to M, and set LCI+2, i+1, tAnd LCI+2, i+2, t's
Element number is not less than 2*M, then will number the WIFI probes for being i+1 to the road numbered between the WIFI probes for being i
Passage rate is defined as congestion speed, is 5KM/h；
Work as LCI+1, i, tElement number when being not less than M, LCI+1, i, tThe speed of middle jth car is：
Wherein trjRepresent the time that jth car is detected in i-th of WIFI probe, average current speed of the jth car in current road segment
Spend and be：vi=avg (vI, j), by calculating LCI+1, i, tIn all vehicles be averaged passage rate, so as to obtain WIFI probes i+1 extremely
The distance between WIFI probes i DiOn road speed.
Preferably, in step S06, calculate respectively numbering be 0,1,2, own between the WIFI probes of 3...i...n
Road speed, combination obtain the passage rate of whole road network.
Beneficial effects of the present invention are：
Technical solution provided by the present invention can exclude the dry of the factors such as parallel road vehicle, passenger stock and congestion in road
Disturb so that the road average speed of the highway measured is more accurate.Meanwhile the present invention is passed through car using highway
Speed is fast, across putting the characteristics of more, using WIFI in the WIFI probe collection driving vehicles being previously deployed on highway side
The id information of equipment and by the moment, so as to estimate the travel speed of vehicle on a highway.
Brief description of the drawings
Fig. 1 is the flow for detecting the speed-measuring method of road passage rate on highway in the present embodiment based on WIFI probes
Structure diagram；
Fig. 2 is the data that WIFI probes are collected in the present embodiment；
Fig. 3 is the WIFI equipment data collected at the same time by WIFI probes 1 and WIFI probes 2 in the present embodiment.
Embodiment
In the present embodiment：
Road speed referred in the unit interval, passed through the average of some region vehicle pass-through speed of section.WIFI is visited
Pin refers in the equipment in investigative range, can detect all WIFI equipments in signal cover, and record detection
To at the time of and device id, such as can detect open WIFI switch mobile phone, IPAD.Parallel road refers to and a certain bar
The distance between the parallel road of highway, two road are often nearer.Vehicle on parallel road when driving, can also be by
The WIFI probes installed on another road detect.Passenger stock refers to all vehicles using carrying as operation business.
Passenger stock passenger is more, causes WIFI equipment more, these equipment all represent the speed of same car, may influence path link
The calculating of scanning frequency degree.Passenger stock referred to herein, refers in particular to multiply and takes out the more vehicle of visitor, need to generally be more than 6 people.
In the present embodiment, due to WIFI probe in detecting to WIFI equipment information derive from passenger on vehicle, therefore count
The translational speed of obtained WIFI equipment is the travel speed of this car.
As shown in Figure 1, the present embodiment provides a kind of technical solution：Based on road on WIFI probes detection highway
The speed-measuring method of speed, the speed-measuring method include the following steps：
S01, collection WIFI equipment information
Take WIFI probes common n+1, respectively reference numeral be 0,1,2,3......n, WIFI probe deployments need to test the speed
On highway, to gather the id information of WIFI equipment and pass through the moment；Wherein, WIFI probes will be adopted every time interval T
The id information that collects and by being uploaded to central server constantly.
S02, will number the id information that is collected in t time interval of WIFI probes for being i and by the way that collection is made constantly
Close LI, t, the WIFI probes of numbering i be numbering be 0,1,2, one of them in 3......nWIFI probes.
S03, judge vehicle heading
If set LI, tIn vehicle, in LI+1, t, LI+1, t-1Or LI+1, t-2In be found, it is from numbering i+ to illustrate vehicle
Reached at 1WIFI deployed with devices at the WIFI equipment deployment that numbering is i.If set LI, tIn vehicle, in LI-1, t, LI-1, t-1Or
Person LI-1, t-2In be found, illustrate vehicle be reached at numbering i-1WIFI probes numbering be i WIFI probes at.Find out from
The new set LD of vehicle composition at the WIFI probes that numbering is i is reached at the WIFI probes of numbering i+1I+1, i, t.Because road is fast
It is two-way to spend result of calculation, succinct for what is illustrated, below set LD is only discussedI+1, i, tSituation.WIFI probes detect
Id information is in set LI, t、LI+1, t、LI+1, t-1And LI+1, t-2In in the presence of, then vehicle is by numbering the WIFI probe rows for being i+1
Sail at the WIFI probes that numbering is i；At this time, the WIFI probes that numbering is i will be driven to by numbering the WIFI probes for being i+1
The vehicle composition set LD at placeI+1, i, t, DiFor WIFI probes extremely the distance between WIFI probes of numbering i+1 of numbering i.
S04, reject parallel road vehicle
If set LDI+1, i, tIn have the vehicle that quantity is x, and the quantity is equal by the id information detected on the vehicle of x
It is not belonging to LI+2, t-n, LI+3, t-nAny one set in (0 ＜=n ＜=3) or when being not belonging to above-mentioned two set at the same time, then pick
Except the vehicle that the quantity is x, newly collection is combined into LK to the vehicle after rejectingI+1, i, t=LDI+1, i, t-x。
S05, reject same vehicle device
(1) equipment close quarters is estimated
In same scan cycle, WIFI probe scannings to the set of WIFI equipment information be denoted as LNI+1, i, t, tf, in K
In a scan period, max (LNI+1, i, t, tf) it is WIFI equipment information-intensive area, it is denoted as set LMI+1, i, t；Wherein, tf is
The scan period of WIFI probes.
(2) estimation colleague cluster tool
If there is y WIFI equipment information to appear in set LM at the same timeI+1, i, tWith set LMI+2, i+1, tIn, then it is assumed that this y
WIFI equipment is on same car；If y ＞ 6, from set LKI+1, i, tIn subtract the WIFI equipment information of repetition vehicle, collected
Close LCI+1, i, t, set LCI+1, i, t=LKI+1, i, t-y+1；
S06, congestion judge, obtain congestion speed
When meeting condition：Set LCI+1, i, tElement number be less than M, and set LCI+2, i+1, tAnd LCI+2, i+2, tElement
Number is less than 2*M, then the passage rate on road between the WIFI probes that the WIFI probes that numbering is i+1 are i to numbering is set
For this section of high speed speed limit；
When meeting condition：Set LCI+1, i, tElement number be more than or equal to M, and set LCI+2, i+1, tAnd LCI+2, i+2, t's
Element number is not less than 2*M, then will number the WIFI probes for being i+1 to the road numbered between the WIFI probes for being i
Passage rate is defined as congestion speed, is 5KM/h；
Work as LCI+1, i, tElement number when being not less than M, M can value be 10, LCI+1, i, tThe speed of middle jth car is：Wherein trjRepresent the time that jth car is detected in i-th of WIFI probe, jth car is on current road
Section average passage rate be：vi=avg (vI, j), by calculating LCI+1, i, tIn all vehicles be averaged passage rate, so as to obtain
The distance between the WIFI probes that the WIFI probes that numbering is i+1 are i to numbering DiOn road speed.
S07, calculate road network speed
Calculate respectively numbering be 0,1,2, road speed all between the WIFI probes of 3......n, combination obtains
The passage rate of whole road network.
Below with specific data instance：
1st, data as shown in Figure 2 are the deployment data that one of WIFI probes are collected on a highway, according to upper
Method is stated to calculate the data：
2nd, vehicle heading is judged：As shown in figure 3, we count the WIFI equipment of setting-out frame and appear at the same time first
Among WIFI probes 1 and WIFI probes 2, then judged according to timestamp, last three collected except WIFI probes 2
WIFI equipment is to leave for WIFI probes 2 from WIFI probes 1, and other parts are all to leave for WIFI probes 1 from WIFI probes 2.
We only calculate the WIFI equipment for leaving for WIFI probes 1 from WIFI probes 2 in an experiment.
3rd, parallel road vehicle is rejected
Following equipment only occurred in probe 2, therefore treated them as the vehicle that tangible parallel road uplink is sailed, by it
Reject.
The data of rejecting are：
21:42:52:1S:SF:TS
2:60:34:0D:DS:CW
54:20:02:3F:GS:GE
4th, same vehicle device is rejected
Following equipment is almost appeared in probe 1,2,3 at the same time, can be regarded as colleague's equipment, only be retained one of which number
According to deleting unnecessary equipment.
60:01:94:1F:BD:GC
58:01:94:2F:BD:EC
60:81:44:3F:HD:KG
85:01:63:7R:BD:JD
55:36:94:5F:JF:SC
60:95:94:7G:BD:EC
5th, congestion judges
After aforementioned four step, following nine groups of data are there remains：
60:01:94:1F:BD:GC
58:01:94:2F:BD:EC
60:81:44:3F:HD:KG
85:01:63:7R:BD:JD
55:36:94:5F:JF:SC
60:95:94:7G:BD:EC
52:01:85:7F:BD:KC
13:12:94:4F:FD:SS
60:01:94:3F:BD:EC
60:01:94:4F:BD:EC
60:01:94:5F:BD:EC
Since the equipment amount that probe 0,1,2,3 detects is less than 10, this section of super expressway passage rate is set to
High speed speed limit, is 100km/h.
6th, all road speed between residue WIFI probes is calculated respectively, is combined and is obtained the current speed of whole road network
Degree.
Claims (7)
1. the speed-measuring method based on road passage rate on WIFI probes detection highway, it is characterised in that including following step
Suddenly：
The id information of WIFI equipment and pass through on S01, the vehicle travelled using the WIFI probe collections that are deployed on highway
Moment, and be i by wherein numbering the id information that detects of WIFI probes and by the way that set is made constantly, be denoted as set A；
The WIFI probes that numbering is i are one of them in the WIFI probes being deployed on highway, are denoted as WIFI probes i；
S02, the WIFI probe adjacent with WIFI probes i are WIFI probe i-1 or WIFI probe i+1, WIFI probes i-1 or WIFI
Id information that probe i+1 is detected and by forming set constantly, is denoted as set A1；
Pass through set A and set A1In array judge the moving direction of WIFI equipment, choose the ID of the WIFI equipment unidirectionally moved
Information and by forming new set constantly, is denoted as set B；
S03, in the set B, reject the id information of the WIFI equipment on parallel with super expressway road and pass through the moment
Afterwards, set C is obtained；
S04, in the set C, reject the id information of WIFI equipment on same vehicle and by moment array, collected
Close D；
S05, judge whether highway gets congestion, and obtains congestion speed；
The road speed of whole WIFI equipments in set D is calculated；
S06, by calculating the road speed between deployment each WIFI probes on a highway, combination obtains whole
The passage rate of road network, the passage rate of the passage rate, that is, vehicle.
2. the speed-measuring method according to claim 1 based on road passage rate on WIFI probes detection highway, its
It is characterized in that, in step S01, WIFI probes i is in time interval T is by the id information collected and by being uploaded to constantly
Central server, set A are the id information that is collected in t time interval of WIFI probes and by the set made by the moment
LI, t。
3. the speed-measuring method according to claim 1 based on road passage rate on WIFI probes detection highway, its
It is characterized in that, in step S02, the WIFI probes numbering of trip adjacent with WIFI probes i and disposed thereon is i+1, is denoted as WIFI
The id information and pass through the set L made by the moment that probe i+1, WIFI probe i+1 is collected in t time intervalI+1, t,
The id information and pass through the set L made by the moment that WIFI probes i+1 is collected in t-1 time intervalI+1, t-1, WIFI spies
The id information and pass through the set L made by the moment that pin i+1 is collected in t-2 time intervalI+1, t-2；
It is present in L at the same time when the id information for the WIFI equipment that WIFI probes i is detected and by the momentI, t、LI+1, t、LI+1, t-1And
LI+1, t-2When, then by the id information and by forming new set constantly, it is denoted as LDI+1, i, t, i.e., the set B described in step S02,
DiFor the distance between WIFI probes i to WIFI probes i+1.
4. the speed-measuring method according to claim 1 based on road passage rate on WIFI probes detection highway, its
It is characterized in that, in step S03, if set LDI+1, i, tIn have the WIFI equipment that quantity is x, and the quantity is institute on the vehicle of x
The id information detected is not admitted to
LI+2, t-n, LI+3, t-n(0 ＜=n ＜=3)
In any one set or when being not belonging to above-mentioned two set at the same time, then reject the vehicle that the quantity is x, the car after rejecting
New collection is combined into LKI+1, i, t=LDI+1, i, t- x, i.e. the set D.
5. the speed-measuring method according to claim 1 based on road passage rate on WIFI probes detection highway, its
It is characterized in that, step S04 includes:
Step S04.1, WIFI equipment close quarters is estimated
In same scan cycle, WIFI probe scannings to the set of WIFI equipment information be denoted as
LNI+1, i, t, tf, in the scan period of K WIFI probe, max (LNI+1, i, t, tf) it is WIFI equipment information-intensive area,
It is denoted as set LMI+1, i, t；Wherein, tf is the scan period of WIFI probes；
Step S04.2, estimation colleague WIFI equipment set
If there is y WIFI equipment information to appear in set LM at the same timeI+1, i, tWith set LMI+2, i+1, tIn, then it is assumed that this y WIFI is set
For on same car；If y ＞ 6, from set LKI+1, i, tIn subtract the WIFI equipment information of repetition vehicle, gathered
LCI+1, i, t, set LCI+1, i, t=LKI+1, i, t- y+1, i.e. the set D.
6. the speed-measuring method according to claim 1 based on road passage rate on WIFI probes detection highway, its
It is characterized in that, step S05 is specifically included:
When meeting condition：Set LCI+1, i, tElement number be less than M, and set LCI+2, i+1, tAnd LCI+2, i+2, tElement number it is small
The passage rate on road between 2*M, the then WIFI probes that the WIFI probes that numbering is i+1 are i to numbering is set to this section
High speed speed limit；
When meeting condition：Set LCI+1, i, tElement number be more than or equal to M, and set LCI+2, i+1, tAnd LCI+2, i+2, tElement
Number is not less than 2*M, then will number current speed of the WIFI probes for being i+1 to the road numbered between the WIFI probes for being i
Degree is defined as congestion speed, is 5KM/h；
Work as LCI+1, i, tElement number when being not less than M, LCI+1, i, tThe speed of middle jth car is：
Wherein trjRepresent the time that jth car is detected in i-th of WIFI probe, jth car is in the average logical of current road segment
Scanning frequency degree is：vi=avg (vI, j), by calculating LCI+1, i, tIn all vehicles be averaged passage rate, so as to obtain WIFI probes i+
1 to the distance between WIFI probes i DiOn road speed.
7. the speed-measuring method according to claim 1 based on road passage rate on WIFI probes detection highway, its
Be characterized in that, in step S06, calculate respectively numbering be 0,1,2, path link all between the WIFI probes of 3...i...n
Scanning frequency degree, combination obtain the passage rate of whole road network.
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| CN111179598A (en) * | 2020-01-18 | 2020-05-19 | 杭州后博科技有限公司 | Vehicle running speed calculation method and system based on intelligent lamp pole |
| CN114999219A (en) * | 2022-06-23 | 2022-09-02 | 重庆城市综合交通枢纽（集团）有限公司 | Underground parking lot vehicle running state sensing system |
| CN115131964A (en) * | 2022-06-23 | 2022-09-30 | 重庆交通大学 | Tunnel traffic flow sensing system |
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