CN113963532A - Road section vehicle number estimation method and terminal based on intermittent release characteristics - Google Patents
Road section vehicle number estimation method and terminal based on intermittent release characteristics Download PDFInfo
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Abstract
The invention discloses a method for estimating the number of vehicles in a road section based on intermittent release characteristics, which comprises the following steps: 1) grouping the upstream road traffic-passing records; 2) the downstream road traffic record is grouped; 3) the upstream and downstream vehicle passing records are matched in a correlation manner; 4) and estimating the number of vehicles in the road section. The invention sets the minimum interval threshold value of traffic flow intermittent release by utilizing the characteristic of lamp control intersection traffic flow intermittent release, carries out grouping operation on the vehicle passing records of upstream and downstream roads according to the threshold value, generates the matching data of upstream and downstream vehicles by combining the vehicle unique identity information correlation analysis determined by the combination of the number plate number and the number plate color, effectively reduces the searching range of the matching data by utilizing the following characteristic of vehicle driving, rapidly calculates the real-time vehicle number in the road section at any moment, and provides data support for finely mastering the road section level traffic state.
Description
Technical Field
The invention belongs to the technical field of traffic information acquisition and analysis, and particularly relates to a method and a terminal for estimating the number of vehicles in a road section based on intermittent release characteristics.
Background
With the continuous progress of national economy and the rapid development of vehicles, the attention and importance of traffic safety are also increasing. The traffic jam problem is more and more serious, and the management is difficult, and in the face of these traffic problems, intelligent traffic system takes place at the same time, and the potential of the existing traffic infrastructure is exerted to the maximum extent, and the new generation of intelligent traffic equipment is combined, so that the future traffic is more intelligent and reasonable. The statistics of the number of vehicles in the road section is also important as a part of an intelligent traffic system.
The number of vehicles in a road section refers to the number of vehicles in the middle between two intersections at the upstream and the downstream, the existing method for estimating the number of vehicles in the road section has high dependency on historical data of the same day in the week, but due to the difference of driving behaviors of traffic participants and the influence of random traffic event factors such as accidents, breakdown, temporary parking and the like, traffic flows at the same time on different dates have certain randomness, and traffic parameters obtained by analyzing real-time data and historical data of the same day in the week have certain difference, so that the accuracy of estimating the number of vehicles in the road section is often low.
Disclosure of Invention
In view of the above disadvantages of the prior art, an object of the present invention is to provide a method and a terminal for estimating the number of vehicles in a road segment based on an intermittent release feature, so as to solve the problem that the method for estimating the number of vehicles in a road segment in the prior art is too dependent on historical data of the same day of the week, which results in low accuracy of estimating the number of vehicles in the road segment. The invention sets the minimum interval threshold value of traffic flow intermittent release by utilizing the characteristic of lamp control intersection traffic flow intermittent release, carries out grouping operation on the vehicle passing records of upstream and downstream roads according to the threshold value, generates the matching data of upstream and downstream vehicles by combining the vehicle unique identity information correlation analysis determined by the combination of the number plate number and the number plate color, effectively reduces the searching range of the matching data by utilizing the following characteristic of vehicle driving, rapidly calculates the real-time vehicle number in the road section at any moment, and provides data support for finely mastering the road section level traffic state.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention discloses a road section vehicle number estimation method based on intermittent release characteristics, which comprises the following steps of:
1) grouping the upstream road traffic record: updating an upstream vehicle passing record linked list, and grouping newly-added upstream road traffic passing records according to a traffic flow discontinuous release minimum interval threshold;
2) and (3) grouping the downstream road traffic-passing records: updating a downstream vehicle passing record linked list, and grouping newly-added downstream road vehicle passing records according to a traffic flow discontinuous release minimum interval threshold;
3) the upstream and downstream vehicle passing record is matched in an associated manner: performing correlation matching on the upstream and downstream vehicle passing records according to the following characteristics of the upstream and downstream vehicle passing record comparison retrieval and vehicle driving;
4) estimation of number of vehicles in road section: calculating three parameters of an initial value of the number of vehicles in the road section, the proportion of vehicles which are driven from the upstream to leave and are not stopped in the road section in the upstream vehicle passing record, and the proportion of vehicles which are driven from the upstream to leave and pass through the downstream in the downstream vehicle passing record; and calculating to obtain the estimated value of the number of vehicles in the road section according to the relevance between the traffic flows.
Further, the upstream road traffic passing record comprises: number plate number, number plate color, crossing number, lane number, passing time, grouping number, and passing time of downstream crossing.
Further, the downstream road traffic record comprises: number plate number, number plate color, crossing number, lane number, passing time, group number, and passing time of upstream crossing.
Further, grouping the newly added upstream road traffic passing records according to the traffic flow discontinuous release minimum interval threshold in the step 1), specifically includes:
11) and (3) calculating the minimum interval of intermittent release of the traffic flow: taking the sum of the minimum green light time and the transition light color time of all passing phases of a certain traffic flow from the loss of the right of way to the next acquisition of the right of way, namely the traffic flow intermittent passing minimum interval which is a fixed value and is irrelevant to the actual execution scheme of signal control;
12) updating the upstream vehicle-passing record linked list: adding the newly added vehicle passing record of the upstream intersection into an upstream vehicle passing record linked list, wherein the linked list only stores all vehicle passing records of the upstream intersection in the previous period (such as 1 hour);
13) dividing the reference traffic flow vehicle groups: optionally selecting one traffic flow as a reference traffic flow divided by vehicle groups, comparing the headway time distance between adjacent vehicles of the reference traffic flow with a traffic flow discontinuous release minimum interval threshold value, and determining the membership group number of each vehicle and the starting time and the ending time corresponding to each group;
14) determining non-reference traffic flow membership groups: and comparing the passing time of the passing record of all subordinate lanes of the non-reference traffic flow with the starting time of each group to determine the group number of the vehicle.
Further, the grouping of the newly added downstream road traffic passing records according to the minimum interval threshold value of discontinuous traffic release in the step 2) includes the following steps:
21) and (3) calculating the minimum interval of intermittent release of the traffic flow: taking the sum of the minimum green light time and the transition light color time of all passing phases of a certain traffic flow from the loss of the right of way to the next acquisition of the right of way, namely the minimum interval of discontinuous release of the traffic flow, wherein the fixed value is irrelevant to the actual execution scheme of signal control;
22) updating a downstream vehicle-passing record linked list: adding the newly added vehicle passing records of the downstream intersection into a downstream vehicle passing record linked list, wherein the linked list only stores all vehicle passing records of the downstream intersection in the previous period (such as 1 hour);
23) dividing the reference traffic flow vehicle groups: optionally selecting one traffic flow as a reference traffic flow divided by vehicle groups, comparing the headway time distance between adjacent vehicles of the reference traffic flow with a traffic flow discontinuous release minimum interval threshold value, and determining the membership group number of each vehicle and the starting time and the ending time corresponding to each group;
24) determining non-reference traffic flow membership groups: and comparing the passing time of the passing record of all subordinate lanes of the non-reference traffic flow with the starting time of each group to determine the group number of the vehicle.
Further, the step 3) of performing upstream and downstream vehicle passing record association matching according to the upstream and downstream vehicle passing record comparison retrieval and the following characteristics of vehicle driving specifically comprises:
31) judging whether the downstream intersection has a newly-added vehicle passing record, and if the downstream intersection has the newly-added vehicle passing record, entering the step 32); if not, continuing to wait;
32) comparing and searching the newly added downstream road traffic passing records with the traffic passing records in the upstream traffic passing record chain table one by one, extracting and recording the currently selected upstream road traffic passing record, and executing the step 33);
33) for a certain upstream road crossing vehicle-passing record, when the time for passing through a downstream road crossing in the vehicle-passing record is searched to be a null value, if the number plate number and the number plate color in the upstream and downstream vehicle-passing records are the same, recording the upstream road crossing vehicle-passing record, and executing the step 34); if the number plate numbers and the number plate colors in the upstream and downstream vehicle passing records are not identical, entering the step 32); when the time of passing through the downstream intersection in the vehicle passing record is searched to be a non-null value, the vehicle passing through the downstream intersection is indicated, according to the following characteristics of vehicle driving, the searched vehicle should appear in a plurality of upstream groups within a previous period of time (such as 15 minutes), a search stopping judgment rule is set, and the vehicle search range is narrowed; if the retrieval is needed to be continued, step 32) is carried out;
34) extracting the passing time recorded by the newly added passing vehicle of the downstream road junction, and updating the passing time into the data item of the passing time of the recorded passing vehicle of the upstream road junction; and simultaneously extracting the recorded passing time of the upstream road crossing vehicle passing record, and recording the passing time into the data item of the newly added passing time of the downstream road crossing vehicle passing record.
Further, the estimating the number of vehicles in the road section in the step 4) specifically includes:
41) calculating an initial value of the number of vehicles in the road section at the moment: determining whether the vehicle has driven away from the downstream intersection or not according to whether the data item of the time of passing the downstream intersection in the upstream vehicle-passing record linked list is null or not, setting a stopping retrieval judgment rule according to the following characteristics of vehicle driving, and calculating to obtain an initial value of the number of vehicles in the road section at the current calculation time;
42) calculating the proportion of vehicles which are not stopped in the road section and are driven from the upstream in the recording of the upstream vehicle: counting the number of vehicles passing through the upstream in a plurality of groups in which the existing vehicles leave the downstream in a previous period of time (such as 15 minutes) and the number of vehicles passing through the upstream but not passing through the downstream in the upstream vehicle record linked list, and calculating the proportion of the vehicles leaving the section without stopping in the upstream vehicle record;
43) calculating the ratio of vehicles driving from the upstream to the downstream in the downstream passing vehicle record: counting the number of vehicles passing through the downstream vehicle and the number of vehicles passing through the downstream vehicle but not passing through the upstream vehicle in a plurality of groups within a previous period (such as 15 minutes) in a downstream vehicle record linked list, and calculating the proportion of vehicles driving from the upstream to the downstream vehicle in the downstream vehicle record;
44) estimation of number of vehicles in road section: and according to the inter-traffic correlation, correcting the initial value of the number of vehicles in the road section by combining the occupation ratio of the vehicles which are not stopped in the road section from the upstream driving away in the upstream vehicle passing record and the occupation ratio of the vehicles which are not stopped in the road section from the upstream driving away in the downstream vehicle passing record to obtain the estimated value of the number of vehicles in the road section.
The method carries out grouping operation on the vehicle passing records of the upstream and downstream road according to the minimum interval of discontinuous release of the traffic flow, can quickly acquire the number of vehicles in a road section at any calculation moment by utilizing the following characteristic of vehicle driving, is convenient for calculating the refined traffic state in real time, and provides data support for intelligent traffic signal control.
The invention also provides a terminal for estimating the number of vehicles in a road section based on the intermittent release characteristics, which comprises the following steps: one or more processors; a memory for storing one or more programs; the one or more programs, when executed by the one or more processors, cause the one or more processors to implement a method for estimating a number of vehicles in a road segment based on a discontinuous clearance feature as described above.
The invention has the beneficial effects that:
1. the method of the invention does not depend on historical data, only utilizes real-time data and has high calculation accuracy.
2. In the invention, only the latest upstream and downstream vehicle matching data at the current calculation time is extracted in each calculation, and no accumulated error is generated.
3. The number of vehicles in the road section can depict the traffic demand level through different numerical value sections.
Drawings
Fig. 1 is a schematic view of traffic flow at an upstream and a downstream intersection.
Fig. 2 is a schematic diagram of association and matching of upstream and downstream vehicle passing record groups.
Fig. 3 is a schematic diagram of the relationship between traffic flows of traffic zones in the upstream and downstream intersections and the road sections.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.
The invention discloses a road section vehicle number estimation method based on intermittent release characteristics, which comprises the following steps of:
1) grouping the upstream road traffic record: the upstream road crossing vehicle passing record comprises data items such as number plate numbers, number plate colors, crossing numbers, lane numbers, passing time, grouping numbers, passing time of downstream crossings and the like; constructing all vehicle passing records in a period of time (such as 1 hour) before the upstream intersection to form an upstream vehicle passing record linked list; and grouping the upstream road traffic passing records according to the traffic flow discontinuous release minimum interval threshold. Optionally selecting a traffic flow as a reference traffic flow for vehicle grouping division, calculating the headway time of the current vehicle and the previous vehicle, comparing the headway time with the minimum interval threshold value for intermittent release of the traffic flow, and determining the grouping number of each vehicle and the information such as the starting time, the ending time and the like corresponding to each group; the vehicles of other traffic flows can determine the affiliated grouping information according to the passing time of the vehicles.
2) And (3) grouping the downstream road traffic-passing records: the downstream road crossing vehicle passing record comprises data items such as number plate numbers, number plate colors, crossing numbers, lane numbers, passing time, grouping numbers, passing time of upstream crossings and the like; constructing all vehicle passing records in a period of time (such as 1 hour) before a downstream intersection to form a downstream vehicle passing record linked list; and grouping the downstream road traffic passing records according to the traffic flow discontinuous release minimum interval threshold value. And selecting one traffic flow as a reference traffic flow divided by the vehicle groups, calculating the time headway between the current vehicle and the previous vehicle, comparing the time headway with the minimum interval threshold value for intermittent release of the traffic flow, determining the group number of each vehicle and the information such as the starting time and the ending time corresponding to each group, and determining the group information of the other vehicles according to the passing time of the other vehicles.
3) The upstream and downstream vehicle passing record is matched in an associated manner: and performing association matching on the upstream and downstream vehicle passing records according to the comparison retrieval of the upstream and downstream vehicle passing records and the following characteristics of vehicle driving. And comparing and searching a newly added vehicle passing record at the downstream intersection with the upstream vehicle passing record linked list, effectively reducing the comparison and searching range according to the following characteristic of vehicle driving, and updating the time data item of the upstream vehicle passing record at the downstream intersection and the time data item of the downstream vehicle passing record at the upstream intersection when the number plate number and the color plate number in the upstream and downstream vehicle passing records are the same.
4) Estimation of number of vehicles in road section: counting the total number of vehicles which do not drive away from a downstream intersection at the current calculation moment according to the upstream vehicle passing record linked list, and calculating the initial value of the number of vehicles in the road section; counting vehicles passing through the upstream but not passing through the downstream in a previous period according to the upstream vehicle record linked list, and calculating the occupation ratio of the vehicles which are driven from the upstream and not stopped in the road section in the upstream vehicle record; counting vehicles passing through the downstream but not passing through the upstream in the previous period according to the downstream vehicle passing record linked list, and calculating the ratio of vehicles passing through the downstream from the upstream in the downstream vehicle passing record; and correcting the initial value of the number of vehicles in the road section according to the relevance between the traffic flows to obtain the estimated value of the number of vehicles in the road section.
In a preferred example, the grouping of the newly added upstream road traffic-passing records according to the minimum interval threshold for intermittent release of traffic in step 1) includes the following steps:
11) calculating the minimum interval of discontinuous release of traffic; the minimum interval of the intermittent release of the traffic flow can be the sum of the minimum green light time and the transition light color time of all passing phases of a certain traffic flow from the loss of the right of way to the next acquisition of the right of way, namely the minimum interval of the intermittent release of the traffic flow is a fixed value and is irrelevant to the actual execution scheme of signal control;
12) updating the upstream vehicle-passing record linked list; constructing all vehicle passing records in a period of time (such as 1 hour) before the upstream intersection to form an upstream vehicle passing record linked list; acquiring the passing records, Veh, of all subordinate lanes of the reference traffic flow in real time according to the time sequenceup,1，Vehup,2… …, updating the newly added upstream crossing traffic-passing record to the tail of the upstream crossing traffic-passing record linked list, and initially setting the data item of time of passing through the downstream crossing as a null value;
13) dividing the reference traffic flow vehicle groups; according to fig. 1, three traffic flows of the upstream intersection, namely, the left turn to the east in the north, the straight going to the east in the west and the right turn to the east in the south can be converged into the downstream intersection; for signal lamp controlled intersections, each traffic flow has the characteristic of intermittent passing, and one optional traffic flow can be used as a reference traffic flow for vehicle grouping division;
comparing the headway time distance between adjacent vehicles of the reference traffic flow with the traffic flow intermittent release minimum interval threshold value, and determining the membership grouping number of each vehicle and the information such as the starting time, the ending time and the like corresponding to each group; the specific method for dividing the vehicle groups is as follows:
extracting the latest vehicle passing record Veh in the upstream vehicle passing record linked listup,iWhen i ≠ 1, it calculates the headway HT from the previous vehicle when i ≠ 1 is calculated by counting the corresponding group number as 1 and the passing time of this vehicle as the start time of the group 1i＝Tveh,i-Tveh,i-1When HTiWhen the traffic flow discontinuous release minimum interval threshold is less than or equal to the traffic flow discontinuous release minimum interval threshold, returning to continuously obtain the next vehicle; when HTiWhen the time is larger than the minimum interval threshold value of intermittent release of the traffic flow, the passing time of the vehicle is taken as the end time of the current grouping, and meanwhile, the time is taken as the end time of the current groupingAdding 1 to the serial number of the group, taking the passing time of the vehicle as the starting time of the next group, and returning to continuously obtain the next vehicle;
14) determining non-reference traffic flow membership groups; and comparing the passing time of the passing record of all affiliated lanes of the non-reference traffic flow with the starting time of each group to determine the group number of the vehicle.
In a preferred example, the grouping of the newly added downstream road traffic passing records according to the traffic flow discontinuous release minimum interval threshold in step 2) includes the following steps:
21) calculating the minimum interval of discontinuous release of traffic; the minimum interval of the intermittent release of the traffic flow can be the sum of the minimum green light time and the transition light color time of all passing phases of a traffic flow from the loss of the right of way to the next acquisition of the right of way, namely the minimum interval of the intermittent release of the traffic flow, and the parameter is a fixed value and is irrelevant to the actual execution scheme of signal control;
22) updating a downstream vehicle passing record linked list; constructing all vehicle passing records in a period of time (such as 1 hour) before a downstream intersection to form a downstream vehicle passing record linked list; acquiring the passing records, Veh, of all subordinate lanes of the reference traffic flow in real time according to the time sequencedown,1，Vehdown,2… …, updating the newly added downstream crossing traffic-passing record to the tail of the downstream traffic-passing record linked list, and initially setting the data item of the time of passing the upstream crossing as a null value;
23) dividing the reference traffic flow vehicle groups; according to fig. 1, the west entrance of the downstream intersection comprises three traffic flows of turning left to the north in the west, going straight to the east in the west and turning right to the south in the west; for signal lamp controlled intersections, each traffic flow has the characteristic of intermittent passing, and one optional traffic flow can be used as a reference traffic flow for vehicle grouping division;
comparing the headway time distance between adjacent vehicles of the reference traffic flow with the traffic flow intermittent release minimum interval threshold value, and determining the membership grouping number of each vehicle and the information such as the starting time, the ending time and the like corresponding to each group; the specific method for dividing the vehicle groups is as follows:
extracting the latest vehicle passing record in the downstream vehicle passing record chain tableVehdown,jWhen j is equal to 1, the vehicle is the first vehicle, the corresponding group number is counted as 1, the passing time of the vehicle is taken as the starting time of the group 1, and when j is equal to 1, the headway HT from the previous vehicle is calculatedj＝Tveh,j-Tveh,j-1When HTjWhen the traffic flow discontinuous release minimum interval threshold is less than or equal to the traffic flow discontinuous release minimum interval threshold, returning to continuously obtain the next vehicle; when HTjWhen the time interval is larger than the minimum interval threshold value of discontinuous release of the traffic flow, taking the passing time of the vehicle as the ending time of the current grouping, adding 1 to the grouping number, taking the passing time of the vehicle as the starting time of the next grouping, and returning to continuously obtain the next vehicle;
24) determining non-reference traffic flow membership groups; and comparing the passing time of the passing record of all affiliated lanes of the non-reference traffic flow with the starting time of each group to determine the group number of the vehicle.
In a preferred example, referring to fig. 2, the performing, in step 3), the upstream and downstream vehicle passing record association matching according to the upstream and downstream vehicle passing record comparison retrieval and the following characteristics of the vehicle driving includes the following steps:
31) judging whether the downstream intersection has a newly-added vehicle passing record, and if the downstream intersection has the newly-added vehicle passing record, executing the step 32);
32) comparing and searching the newly added downstream road traffic passing records with the traffic passing records in the upstream traffic passing record chain table one by one, extracting and recording the currently selected upstream road traffic passing record, and entering the step 33);
33) for a certain upstream road crossing vehicle-passing record, when the time for passing through the downstream road crossing in the vehicle-passing record is searched to be an empty value, if the number plate number and the number plate color in the upstream and downstream vehicle-passing records are the same, the upstream road crossing vehicle-passing record is recorded, and step 34) is executed; if the number plate numbers and the number plate colors in the upstream and downstream vehicle passing records are not identical, entering the step 32); when the time of passing through the downstream intersection in the vehicle passing record is searched to be a non-null value, the fact that the vehicle passes through the downstream is shown, according to following characteristics of vehicle driving (related concepts such as a vehicle following model and a vehicle fleet exist in traffic, each driver expects to arrive at a destination as soon as possible, so the following characteristics exist among the vehicles), the searched vehicle is required to appear in a plurality of recent upstream groups, a search stopping judgment rule is set, the vehicle searching range is narrowed, and the searching efficiency is improved;
the search stopping judgment rule is specifically as follows: if the time of passing the downstream intersection in the vehicle passing record is not null value in the first search, extracting the grouping number of the vehicle passing record of the upstream intersection and recording the grouping number as GroupNoupThen, go to step 32) to continue searching; if the time of passing the downstream intersection in the vehicle passing record is not null value, the upstream intersection group number of the vehicle is extracted and recorded as GroupNoup，newCalculating the group number difference GroupNoup,sub＝GroupNoup-GroupNoup，newWhen GroupNo is considered in consideration of the following characteristic of the vehicle drivingup,subIf the value is larger than a certain value (in the example, the value is 3), the vehicle is not driven away from the downstream intersection together with the vehicle in the same way for a long time, the vehicle is considered to be directly driven into the downstream from the road section, and the retrieval is stopped;
34) extracting the passing time recorded by the newly added passing vehicle of the downstream road junction, and updating the passing time into the data item of the passing time of the recorded passing vehicle of the upstream road junction; and simultaneously extracting the recorded passing time of the upstream road crossing vehicle passing record, and recording the passing time into the data item of the newly added passing time of the downstream road crossing vehicle passing record.
In a preferred example, the estimating of the number of vehicles in the road segment according to the upstream vehicle-passing record linked list and the downstream vehicle-passing record linked list in the step 4) includes the following steps:
41) and (3) carrying out preliminary statistics on the number of vehicles in the road section: determining whether the vehicle has driven away from the downstream intersection or not according to whether the data item of the time of passing the downstream intersection in the upstream vehicle-passing record linked list is null or not, setting a stopping retrieval judgment rule according to the following characteristics of vehicle driving, and calculating to obtain an initial value of the number of vehicles in the road section at the current calculation time;
the initial value of the number of vehicles in the road section is recorded as SegVehNuminit(ii) a When the vehicle passes by the upstream, the recording chain table is recordedWhen the time of passing the downstream intersection is null, adding 1 to the initial value of the number of vehicles in the road section, and returning to continue searching; when the data item of the time of passing the downstream intersection in the upstream and downstream vehicle-passing record linked list is a non-null value, if the data item is the non-null value for the first time, the current packet number is recorded as MatchGroupNoupReturning to continue searching, if not being the first non-null value, calculating the current packet number and MatchGroupNoupIf the difference is greater than a certain value (in the example, the value is 3), the search is stopped;
42) passing upstream but not downstream vehicle statistics: the number of vehicles passing upstream is recorded as VehTotalNumupThe number of vehicles passing upstream but not passing downstream is recorded as VehPartNumup(ii) a When the data item of the time of passing the downstream intersection in the upstream vehicle record linked list is null, VehTotalNumupAnd VehPrtNumupAdding 1, returning to continue searching; when the data item of the time of passing the downstream intersection in the upstream vehicle record linked list is a non-null value, VehTotalNumupPlus 1, if it is the first non-null value, VehTotalNumupAnd VehPrtNumupReset to 1 and record the current packet number as MatchGroupNoupReturning to continue searching; if the packet number is not a non-null value for the first time, calculating the current packet number and MatchGroupNoupIf the difference is less than or equal to a certain value (in the example, the value is 5), returning to continue searching, and if the difference is greater than the certain value, stopping searching;
the ratio of vehicles which are not stopped in the road section and are driven away from the upstream in the recording of the upstream passing vehicles is
43) Passing downstream but not upstream vehicle statistics: the number of vehicles passing downstream is recorded as VehTotalNumdownThe number of vehicles passing downstream but not upstream is recorded as VehPartNumdown(ii) a When the data item of the time of passing the upstream intersection in the downstream vehicle record linked list is null, VehTotalNumdownAnd VehPrtNumdownPlus 1, returnContinuing to search; when the data item of the time of passing the upstream intersection in the downstream vehicle record linked list is a non-null value, VehTotalNumdownPlus 1, if it is the first non-null value, VehTotalNumdownAnd VehPrtNumdownReset to 1 and record the current packet number as MatchGroupNodownReturning to continue searching; if the packet number is not a non-null value for the first time, calculating the current packet number and MatchGroupNodownIf the difference is less than or equal to a certain value (in the example, the value is 5), returning to continue searching, and if the difference is greater than the certain value, stopping searching;
the ratio of vehicles driving from upstream to downstream in the downstream passing record is
44) Estimation of number of vehicles in road section: the estimated value of the number of vehicles in the road section is recorded as SegVehNumfinalBecause the vehicles may stop in the road section or drive into the downstream intersection from the traffic cell in the road section, and the like, in combination with the relationship between the upstream and downstream traffic flows and the traffic flow of the traffic cell in the road section shown in fig. 3, the initial value of the number of vehicles in the road section can be obtained by correcting the initial value of the number of vehicles in the road section through the upstream drive-off and non-stop vehicle occupation ratio in the upstream passing record and the downstream drive-off and downstream vehicle occupation ratio in the downstream passing record; the correction formula is as follows:
while the invention has been described in terms of its preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (8)
1. A method for estimating the number of vehicles in a road section based on intermittent release characteristics is characterized by comprising the following steps:
1) grouping the upstream road traffic record: updating an upstream vehicle passing record linked list, and grouping newly-added upstream road traffic passing records according to a traffic flow discontinuous release minimum interval threshold;
2) and (3) grouping the downstream road traffic-passing records: updating a downstream vehicle passing record linked list, and grouping newly-added downstream road vehicle passing records according to a traffic flow discontinuous release minimum interval threshold;
3) the upstream and downstream vehicle passing record is matched in an associated manner: performing correlation matching on the upstream and downstream vehicle passing records according to the following characteristics of the upstream and downstream vehicle passing record comparison retrieval and vehicle driving;
4) estimation of number of vehicles in road section: calculating three parameters of an initial value of the number of vehicles in the road section, the proportion of vehicles which are driven from the upstream to leave and are not stopped in the road section in the upstream vehicle passing record, and the proportion of vehicles which are driven from the upstream to leave and pass through the downstream in the downstream vehicle passing record; and calculating to obtain the estimated value of the number of vehicles in the road section according to the relevance between the traffic flows.
2. The method for estimating the number of vehicles on a road segment based on a discontinuous release characteristic according to claim 1, wherein the upstream road traffic-passing record includes: number plate number, number plate color, crossing number, lane number, passing time, grouping number, and passing time of downstream crossing.
3. The method for estimating the number of vehicles on a road segment based on a discontinuous release characteristic according to claim 1, wherein the downstream crossing vehicle passing record comprises: number plate number, number plate color, crossing number, lane number, passing time, group number, and passing time of upstream crossing.
4. The method for estimating the number of vehicles in a road section based on intermittent release characteristics according to claim 1, wherein the grouping of the newly-added upstream road traffic passing records according to a minimum interval threshold value of intermittent release of traffic flow in step 1) specifically comprises:
11) and (3) calculating the minimum interval of intermittent release of the traffic flow: taking the sum of the minimum green light time and the transition light color time of all passing phases of a certain traffic flow from the loss of the right of way to the next acquisition of the right of way, namely the minimum interval of intermittent release of the traffic flow;
12) updating the upstream vehicle-passing record linked list: adding newly-added vehicle passing records of the upstream crossing into an upstream vehicle passing record linked list, wherein the linked list only stores all vehicle passing records of the upstream crossing in the previous period;
13) dividing the reference traffic flow vehicle groups: optionally selecting one traffic flow as a reference traffic flow divided by vehicle groups, comparing the headway time distance between adjacent vehicles of the reference traffic flow with a traffic flow discontinuous release minimum interval threshold value, and determining the membership group number of each vehicle and the starting time and the ending time corresponding to each group;
14) determining non-reference traffic flow membership groups: and comparing the passing time of the passing record of all subordinate lanes of the non-reference traffic flow with the starting time of each group to determine the group number of the vehicle.
5. The method for estimating the number of vehicles in the road section based on the intermittent release characteristics according to claim 1, wherein the step 2) of grouping the newly-added downstream road traffic passing records according to the minimum interval threshold value of intermittent release of traffic flow comprises the following steps:
21) and (3) calculating the minimum interval of intermittent release of the traffic flow: taking the sum of the minimum green light time and the transition light color time of all passing phases of a certain traffic flow from the loss of the right of way to the next acquisition of the right of way, namely the minimum interval of intermittent release of the traffic flow;
22) updating a downstream vehicle-passing record linked list: adding the newly added vehicle passing records of the downstream crossing into a downstream vehicle passing record linked list, wherein the linked list only stores all vehicle passing records of the downstream crossing in the previous period;
23) dividing the reference traffic flow vehicle groups: optionally selecting one traffic flow as a reference traffic flow divided by vehicle groups, comparing the headway time distance between adjacent vehicles of the reference traffic flow with a traffic flow discontinuous release minimum interval threshold value, and determining the membership group number of each vehicle and the starting time and the ending time corresponding to each group;
24) determining non-reference traffic flow membership groups: and comparing the passing time of the passing record of all subordinate lanes of the non-reference traffic flow with the starting time of each group to determine the group number of the vehicle.
6. The method for estimating the number of vehicles in a road section based on the intermittent release characteristics according to claim 1, wherein the step 3) of performing the association matching of the upstream and downstream passing records according to the comparison retrieval of the upstream and downstream passing records and the following characteristics of vehicle driving specifically comprises:
31) judging whether the downstream intersection has a newly-added vehicle passing record, and if the downstream intersection has the newly-added vehicle passing record, entering the step 32); if not, continuing to wait;
32) comparing and searching the newly added downstream road traffic passing records with the traffic passing records in the upstream traffic passing record chain table one by one, extracting and recording the currently selected upstream road traffic passing record, and executing the step 33);
33) for a certain upstream road crossing vehicle-passing record, when the time for passing through a downstream road crossing in the vehicle-passing record is searched to be a null value, if the number plate number and the number plate color in the upstream and downstream vehicle-passing records are the same, recording the upstream road crossing vehicle-passing record, and executing the step 34); if the number plate numbers and the number plate colors in the upstream and downstream vehicle passing records are not identical, entering the step 32); when the time of passing through the downstream intersection in the vehicle passing record is searched to be a non-null value, the fact that the vehicle passes through the downstream intersection is indicated, the searched vehicle should appear in a plurality of upstream groups in the previous period of time according to the following characteristics of vehicle driving, a search stopping judgment rule is set, and the vehicle search range is narrowed; if the retrieval is needed to be continued, step 32) is carried out;
34) extracting the passing time recorded by the newly added passing vehicle of the downstream road junction, and updating the passing time into the data item of the passing time of the recorded passing vehicle of the upstream road junction; and simultaneously extracting the recorded passing time of the upstream road crossing vehicle passing record, and recording the passing time into the data item of the newly added passing time of the downstream road crossing vehicle passing record.
7. The method for estimating the number of vehicles in a road section based on the intermittent release characteristics according to claim 1, wherein the estimating the number of vehicles in the road section in the step 4) specifically comprises:
41) calculating an initial value of the number of vehicles in the road section at the moment: determining whether the vehicle has driven away from the downstream intersection or not according to whether the data item of the time of passing the downstream intersection in the upstream vehicle-passing record linked list is null or not, setting a stopping retrieval judgment rule according to the following characteristics of vehicle driving, and calculating to obtain an initial value of the number of vehicles in the road section at the current calculation time;
42) calculating the proportion of vehicles which are not stopped in the road section and are driven from the upstream in the recording of the upstream vehicle: counting the number of vehicles which pass through the upstream in a plurality of groups and have driven away from the downstream in a period of time before in the upstream vehicle record linked list, and counting the percentage of vehicles which pass through the upstream vehicles but do not pass through the downstream in the upstream vehicle record;
43) calculating the ratio of vehicles driving from the upstream to the downstream in the downstream passing vehicle record: counting the number of vehicles passing through the downstream and the number of vehicles passing through the downstream but not passing through the upstream in a plurality of groups in the previous period in a downstream vehicle passing record linked list, and calculating the ratio of vehicles driving from the upstream to the downstream in the downstream vehicle passing record;
44) estimation of number of vehicles in road section: and according to the inter-traffic correlation, correcting the initial value of the number of vehicles in the road section by combining the occupation ratio of the vehicles which are not stopped in the road section from the upstream driving away in the upstream vehicle passing record and the occupation ratio of the vehicles which are not stopped in the road section from the upstream driving away in the downstream vehicle passing record to obtain the estimated value of the number of vehicles in the road section.
8. A terminal for estimating the number of vehicles in a road section based on a discontinuous release characteristic, comprising:
one or more processors;
a memory for storing one or more programs;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method recited in any of claims 1-7.
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