CN117558133B - Multi-mode positioning traffic management system of LDSW intelligent label - Google Patents
Multi-mode positioning traffic management system of LDSW intelligent label Download PDFInfo
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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
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0108—Measuring and analyzing of parameters relative to traffic conditions based on the source of data
- G08G1/012—Measuring and analyzing of parameters relative to traffic conditions based on the source of data from other sources than vehicle or roadside beacons, e.g. mobile networks
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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
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0125—Traffic data processing
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- G—PHYSICS
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- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0137—Measuring and analyzing of parameters relative to traffic conditions for specific applications
- G08G1/0145—Measuring and analyzing of parameters relative to traffic conditions for specific applications for active traffic flow control
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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
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- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/16—Gateway arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention relates to the field of traffic management, in particular to a multi-mode positioning traffic management system of an LDSW intelligent tag, which comprises an LDSW tag, a vehicle-mounted positioning module, an LDSW gateway and a traffic management module; the LDSW label comprises a vehicle information storage unit, an LDSW signal receiving unit and an LDSW signal transmitting unit, and the LDSW gateway is used for receiving and forwarding information from the LDSW label and the traffic management module; the vehicle-mounted positioning module is used for positioning the position of the vehicle; the traffic management module is used for analyzing the congestion condition of vehicles on each road section and generating corresponding countermeasures. According to the invention, the LDSW technology is adopted, and the LDSW label and the gateway are arranged, so that the gateway can receive the relevant information of the vehicle through the LDSW, thereby helping the traffic management module to carry out traffic management, and the LDSW label is normally in a sleep state and can start working only when a wake-up signal is received, so that the power consumption is low.
Description
Technical Field
The invention relates to the field of traffic management, in particular to a multi-mode positioning traffic management system of an LDSW intelligent label.
Background
Traffic Management Systems (ATMS) are systems that provide traffic management and drivers with real-time routing, control, and emergency response to emergencies through advanced monitoring, control, and information processing subsystems.
The utility model discloses an intelligent traffic management system as in the prior art of CN107993439A, including monitor platform, communication system and user terminal, monitor platform and user terminal carry out data exchange through communication system, monitor platform is used for carrying out real-time supervision to traffic condition to predict traffic flow, user terminal is used for obtaining from monitor platform traffic flow prediction information, user terminal includes central processing unit, receiving module, storage module, display module, voice module and early warning module, central processing unit respectively with receiving module, storage module, display module, voice module and early warning module are connected, are used for controlling receiving module, storage module, display module, voice module and early warning module.
Another exemplary prior art publication, such as CN110782669a, discloses a traffic management method. The traffic management method comprises the following steps: acquiring road condition information of a monitoring area; analyzing the road condition information of the monitoring area to generate a toll station management strategy; and managing the toll gate entrance traffic based on the toll gate management policy.
And in addition, the intelligent traffic management system disclosed in the prior art of CN105913654B comprises a traffic management system and a prediction device connected with the traffic management system, wherein the prediction device comprises an acquisition module, a data preprocessing module, a data classification module, a stability inspection module, a correlation coefficient calculation module, a threshold setting module, a space-time correlation coefficient matrix generation module, a history correlation coefficient matrix generation module, a prediction factor selection module and a prediction model construction module which are sequentially connected.
At present, in the field of traffic management, the LDSW technology is less utilized and the positioning mode of the vehicle is single, so as to solve the common problems in the field, and the invention is made.
Disclosure of Invention
The invention aims to provide a multi-mode positioning traffic management system of an LDSW intelligent tag aiming at the defects existing at present.
In order to overcome the defects in the prior art, the invention adopts the following technical scheme:
a multi-mode positioning traffic management system of an LDSW intelligent tag comprises an LDSW tag, a vehicle-mounted positioning module, an LDSW gateway and a traffic management module; the LDSW label comprises a vehicle information storage unit, an LDSW signal receiving unit and an LDSW signal transmitting unit, wherein the vehicle information storage unit is used for storing related information of a vehicle, the related information comprises a license plate number, a vehicle owner identity and a vehicle model, the LDSW signal receiving unit is used for receiving a wake-up signal from an LDSW gateway, and the LDSW signal transmitting unit is used for transmitting the content stored by the information storage unit to the LDSW gateway; the LDSW gateway is used for receiving information from the LDSW label and the traffic management module and forwarding the information; the vehicle-mounted positioning module is used for positioning the position of the vehicle according to the GPS signals; the traffic management module is used for analyzing the vehicle congestion condition of each road section according to the signals from the LDSW gateway and generating corresponding countermeasures;
the traffic management module comprises a traffic flow analysis unit which is used for generating congestion indexes of the running direction of the road section where the vehicle is located according to the following formula:
ZB=；
wherein ZB is a congestion index, DIS is the total length of the road section, A is the number of lanes in the running direction of the road section where the vehicle is located, and a is the total number of vehicles in the running direction of the road section where the vehicle is located;for the first weight, ++>The method comprises the steps of carrying out a first treatment on the surface of the b is the number of vehicles stopped beside the lane where the vehicle is traveling in the road section; />Movement of the i-th vehicle moving in the travel direction for the road sectionA speed; />The speed limit of the lane where the ith vehicle moving in the driving direction of the road section is located; e is a natural constant; c is the total number of walkways traversing the road segment.
Further, the LDSW label further comprises a judging unit and a wake-up unit; the judging unit is configured to judge whether the signal received by the LDSW signal receiving unit is a wake-up signal, and the judging method is as follows: the judging unit compares the frequency, the modulation mode and the coding mode of the received signal with the regulations in the communication protocol so as to judge whether the received signal is a wake-up signal or not; the awakening unit is used for awakening the rest part of the LDSW label according to the judging result of the judging unit.
Further, the vehicle-mounted positioning module comprises a positioning signal receiving unit, a position obtaining unit, a map matching unit, a decoding unit and a display unit; the positioning signal receiving unit is used for receiving positioning signals according to GPS signals, and the position acquisition unit is used for calculating geographic position information of the vehicle according to the positioning signals of the positioning signal receiving unit; the map matching unit is used for matching the geographic position information with the digital map so as to determine the exact position of the vehicle on the map; the decoding unit is used for receiving the traffic flow signal from the LDSW gateway and decoding the traffic flow signal; the display unit is used for displaying a digital map with the vehicle position according to the exact position of the vehicle on the map and displaying the congestion degree of each road section near the position of the vehicle according to the decoded traffic flow signal.
Further, the LDSW gateway is arranged at each intersection covered by the multi-mode positioning traffic management system, and the traffic management module comprises a vehicle position calculating unit, a traffic flow analyzing unit, a traffic flow predicting unit, a traffic flow signal generating unit and an emergency response unit; the vehicle position calculation unit is used for calculating the vehicle position according to the signals of the LDSW gateway; the traffic flow analysis unit is used for acquiring vehicle information of the related road according to the calculation result of the vehicle position calculation unit or the position acquisition unit and analyzing the congestion degree of the current road according to the vehicle information; the traffic flow prediction unit is used for predicting the future congestion degree of the road; the traffic flow signal generating unit is used for generating a traffic flow signal according to the analysis result of the traffic flow analysis unit and the prediction result of the traffic flow prediction unit, and the traffic flow signal is used for representing the congestion degree of the road and the future congestion degree of the road; the emergency response unit is used for giving an alarm and generating corresponding emergency measures when the congestion degree of the road or the future congestion degree exceeds a specified threshold value.
Still further, the workflow of the traffic management system comprises the steps of:
s1, an LDSW gateway sends a wake-up signal to an LDSW label;
s2, the LDSW label recognizes the wake-up signal and sends the information in the information storage unit to the LDSW gateway;
s3, the positioning signal receiving unit judges whether the GPS signal quality meets the standard, if so, the positioning signal receiving unit obtains the positioning of the vehicle through the GPS signal and sends the positioning signal to the traffic flow analysis unit and the traffic flow prediction unit and executes S5, otherwise, S4 is executed;
s4, the vehicle position calculating unit calculates the vehicle position according to the signals of the LDSW gateway and sends the vehicle position to the traffic flow analyzing unit and the traffic flow predicting unit to execute S5;
s5, the LDSW gateway collects information of LDSW labels from different vehicles, generates corresponding IDs according to the information sent by the LDSW labels, and sends the IDs to the traffic management module;
s6, the traffic flow analysis unit generates congestion indexes of the running direction of the road section where each ID is located for each ID; the congestion index is used for representing the congestion degree of the road;
s7, the traffic flow prediction unit generates a predicted congestion index of each ID after the predicted time t of the traveling direction of the road section where the traffic flow prediction unit is located; the prediction congestion index is used for representing the future congestion degree of the road;
and S8, the traffic flow signal generating unit generates traffic flow signals according to the indexes generated in the S6 and the S7 and sends the traffic flow signals to the LDSW gateway, the LDSW gateway forwards the traffic flow signals to the vehicle-mounted positioning module of the vehicle corresponding to each ID, the decoding unit decodes the traffic flow signals, and the display unit displays the congestion index and the predictive congestion index.
Still further, in S4, the vehicle position calculating unit calculates the vehicle position according to the signal of the LDSW gateway includes the steps of:
s41, the vehicle-mounted positioning module sends a positioning request signal to an LDSW gateway near the vehicle, and the LDSW gateway near the vehicle forwards the positioning request signal to the traffic management module;
s42, the vehicle position calculation unit screens 3 gateways closest to the vehicle according to the sending time of the positioning request signal and the receiving time of the positioning request signal;
s43, the vehicle position calculating unit calculates the vehicle position through a trilateral ranging positioning method according to the positioning of the 3 gateways and sends the calculation result to the traffic flow signal generating unit;
s44, the traffic flow signal generating unit converts the calculation result into a positioning result signal and sends the positioning result signal to the traffic flow analyzing unit, the traffic flow predicting unit and the positioning signal receiving unit;
s45, the traffic flow analysis unit generates a corresponding congestion index; the traffic flow prediction unit generates a corresponding prediction congestion index; the positioning signal receiving unit decodes the positioning result signal and then sends the decoding result to the map matching unit, so that the position of the vehicle in the map is obtained.
Still further, the traffic flow analysis unit generates a congestion index of a traveling direction of a road section where each ID is located, comprising the steps of:
s61, acquiring the motion state, the running speed and the lane of the vehicle corresponding to each ID according to the information sent by the LDSW label corresponding to each ID;
s62, judging the running direction of the vehicle corresponding to each ID according to the acquired motion state of the vehicle;
and S63, generating congestion indexes of the running direction of the road section where the vehicle corresponding to each ID is located according to the related information.
Further, the display unit comprises a multi-mode positioning display unit, a digital map marking unit, a congestion threshold judging unit and a digital map color conversion unit, wherein the multi-mode positioning display unit is used for displaying a positioning result of GPS positioning or acquiring the positioning of a vehicle on a digital map through an LDSW gateway; the digital map marking unit is used for marking a congestion index or a predictive congestion index of each road section in each driving direction; the congestion threshold judging unit is used for judging whether the congestion index or the predicted congestion index of each road section in each driving direction exceeds a specified threshold; the digital map color conversion unit is used for marking different colors on different road sections on the digital map according to the judgment result of the congestion threshold judgment unit.
The beneficial effects obtained by the invention are as follows: 1. by adopting the LDSW technology, the LDSW label and the gateway are arranged, so that the gateway can receive the relevant information of the vehicle through the LDSW, thereby helping the traffic management module to carry out traffic management, and the LDSW label is normally in a sleep state and can start working only when a wake-up signal is received, the power consumption is less, and the traffic management module is beneficial to saving energy.
2. The vehicle is positioned by adopting two positioning modes, so that the stability and diversity of vehicle positioning are improved, the vehicle can be accurately positioned when GPS signals are poor, and the traffic management module can accurately control the position of the vehicle under various conditions.
3. By setting the congestion index, traffic managers can accurately control the congestion condition of each road and take corresponding traffic control measures, and owners can know the congestion conditions of different roads, so that a moving route is planned.
Drawings
The invention will be further understood from the following description taken in conjunction with the accompanying drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the embodiments. Like reference numerals designate like parts in the different views.
Fig. 1 is a schematic diagram of the overall structure of the present invention.
Fig. 2 is a flow chart of the operation of the present invention.
Fig. 3 is a flow chart of the invention for obtaining the positioning of a vehicle through an LDSW gateway.
Fig. 4 is a flowchart of the traffic flow analysis unit of the present invention generating congestion index of the traveling direction of the road section where each ID is located.
Detailed Description
The following embodiments of the present invention are described in terms of specific examples, and those skilled in the art will appreciate the advantages and effects of the present invention from the disclosure herein. The invention is capable of other and different embodiments and its several details are capable of modification and variation in various respects, all without departing from the spirit of the present invention. The drawings of the present invention are merely schematic illustrations, and are not intended to be drawn to actual dimensions. The following embodiments will further illustrate the related art content of the present invention in detail, but the disclosure is not intended to limit the scope of the present invention.
Embodiment one: according to fig. 1, 2, 3 and 4, the embodiment provides a multi-mode positioning traffic management system of an LDSW intelligent tag, which comprises an LDSW tag, a vehicle-mounted positioning module, an LDSW gateway and a traffic management module; the LDSW label comprises a vehicle information storage unit, an LDSW signal receiving unit and an LDSW signal transmitting unit, wherein the vehicle information storage unit is used for storing related information of a vehicle, the related information comprises a license plate number, a vehicle owner identity and a vehicle model, the LDSW signal receiving unit is used for receiving a wake-up signal from an LDSW gateway, and the LDSW signal transmitting unit is used for transmitting the content stored by the information storage unit to the LDSW gateway; the LDSW gateway is used for receiving information from the LDSW label and the traffic management module and forwarding the information; the vehicle-mounted positioning module is used for positioning the position of the vehicle according to the GPS signals; the traffic management module is used for analyzing the vehicle congestion condition of each road section according to the signals from the LDSW gateway and generating corresponding countermeasures;
preferably, the wake-up signal is generated when the multi-mode positioning traffic management system needs to perform traffic management, and the system defaults to wake up periodically according to a preset period in the period of the peak period of the on-duty and off-duty congestion every day, and the preset period is preferably the time of one traffic light cycle.
The traffic management module comprises a traffic flow analysis unit which is used for generating congestion indexes of the running direction of the road section where the vehicle is located according to the following formula:
ZB=；
wherein ZB is a congestion index, DIS is the total length of the road section, A is the number of lanes in the running direction of the road section where the vehicle is located, and a is the total number of vehicles in the running direction of the road section where the vehicle is located;for the first weight, ++>,/>The value of (2) is taken by a person skilled in the art within the range of values; b is the number of vehicles stopped beside the lane where the vehicle is traveling in the road section; the stopped vehicle is a vehicle that potentially enters the road segment and therefore needs to be taken into account; />A moving speed of an i-th vehicle moving in the traveling direction for the road section; />The speed limit of the lane where the ith vehicle moving in the driving direction of the road section is located; e is a natural constant; c is the total number of walkways traversing the road segment.
Specifically, the number of vehicles or the moving speed of the vehicles counted in the above formula are all information on the road section acquired at the wake-up signal sending moment of the LDSW gateway, wherein the road section length can be acquired in the road information database through the traffic management module, the number of vehicles can be acquired by collecting the label number of LDSW labels from different vehicles through the LDSW gateway, and the acquiring of the information can also refer to the acquiring mode of daily map software, which is not described herein.
In particular, the method comprises the steps of,the staff can set several fixed values according to the past congestion index of the road, different time periods correspond to different values, and the larger the past average congestion index is, the corresponding time period is +.>The larger; the corresponding +.A. can be obtained by matching the current time with the time period>Is a value of (2).
Further, the LDSW label further comprises a judging unit and a wake-up unit; the judging unit is configured to judge whether the signal received by the LDSW signal receiving unit is a wake-up signal, and the judging method is as follows: the judging unit compares the frequency, the modulation mode and the coding mode of the received signal with the regulations in the communication protocol so as to judge whether the received signal is a wake-up signal or not; the awakening unit is used for awakening the rest part of the LDSW label according to the judging result of the judging unit.
Specifically, when the frequency, modulation scheme, and coding scheme of the received signal are the same as those specified in the communication protocol, the received signal is a wake-up signal.
Specifically, the LDSW label is usually in a sleep state, the LDSW signal receiving unit is provided with a periodic monitoring window, the monitoring window can periodically receive signals, the judging unit judges the signals monitored by the monitoring window, when judging that the received signals are wake-up signals, the wake-up unit wakes up the rest of the LDSW label, and the LDSW label is in communication connection with the LDSW gateway through the LDSW signal receiving unit and the LDSW signal sending unit, so that the information stored by the information storage unit is sent to the LDSW gateway, and the LDSW is in a sleep state in most of the time by adopting the LDSW label for periodic monitoring, thereby being beneficial to reducing energy loss.
Further, the vehicle-mounted positioning module comprises a positioning signal receiving unit, a position obtaining unit, a map matching unit, a decoding unit and a display unit; the positioning signal receiving unit is used for receiving positioning signals according to GPS signals, and the position acquisition unit is used for calculating geographic position information of the vehicle according to the positioning signals of the positioning signal receiving unit; the map matching unit is used for matching the geographic position information with the digital map so as to determine the exact position of the vehicle on the map; the decoding unit is used for receiving the traffic flow signal from the LDSW gateway and decoding the traffic flow signal; the display unit is used for displaying a digital map with the vehicle position according to the exact position of the vehicle on the map and displaying the congestion degree of each road section near the position of the vehicle according to the decoded traffic flow signal.
Further, the LDSW gateway is arranged at each intersection covered by the multi-mode positioning traffic management system, and the traffic management module comprises a vehicle position calculating unit, a traffic flow analyzing unit, a traffic flow predicting unit, a traffic flow signal generating unit and an emergency response unit; the vehicle position calculation unit is used for calculating the vehicle position according to the signals of the LDSW gateway; the traffic flow analysis unit is used for acquiring vehicle information of the related road according to the calculation result of the vehicle position calculation unit or the position acquisition unit and analyzing the congestion degree of the current road according to the vehicle information; the traffic flow prediction unit is used for predicting the future congestion degree of the road; the traffic flow signal generating unit is used for generating a traffic flow signal according to the analysis result of the traffic flow analysis unit and the prediction result of the traffic flow prediction unit, and the traffic flow signal is used for representing the congestion degree of the road and the future congestion degree of the road; the emergency response unit is used for giving an alarm and generating corresponding emergency measures when the congestion degree of the road or the future congestion degree exceeds a specified threshold value.
Specifically, the traffic flow signal generating unit generates the corresponding traffic flow signal by encoding the analysis result and the prediction result, and the encoding technology belongs to the prior art and will not be described in detail herein.
In particular, the emergency situation includes a traffic accident on the road or a future congestion degree of the road exceeding a road traffic flow threshold, etc., which are only exemplified herein and are not limited thereto.
Still further, the workflow of the traffic management system comprises the steps of:
s1, an LDSW gateway sends a wake-up signal to an LDSW label;
s2, the LDSW label recognizes the wake-up signal and sends the information in the information storage unit to the LDSW gateway;
s3, the positioning signal receiving unit judges whether the GPS signal quality meets the standard, if so, the positioning signal receiving unit obtains the positioning of the vehicle through the GPS signal and sends the positioning signal to the traffic flow analysis unit and the traffic flow prediction unit and executes S5, otherwise, S4 is executed;
s4, the vehicle position calculating unit calculates the vehicle position according to the signals of the LDSW gateway and sends the vehicle position to the traffic flow analyzing unit and the traffic flow predicting unit to execute S5;
s5, the LDSW gateway collects information of LDSW labels from different vehicles, generates corresponding IDs according to the information sent by the LDSW labels, and sends the IDs to the traffic management module;
s6, the traffic flow analysis unit generates congestion indexes of the running direction of the road section where each ID is located for each ID; the congestion index is used for representing the congestion degree of the road;
s7, the traffic flow prediction unit generates a predicted congestion index of each ID after the predicted time t of the traveling direction of the road section where the traffic flow prediction unit is located; the prediction congestion index is used for representing the future congestion degree of the road;
and S8, the traffic flow signal generating unit generates traffic flow signals according to the indexes generated in the S6 and the S7 and sends the traffic flow signals to the LDSW gateway, the LDSW gateway forwards the traffic flow signals to the vehicle-mounted positioning module of the vehicle corresponding to each ID, the decoding unit decodes the traffic flow signals, and the display unit displays the congestion index and the predictive congestion index.
Further, in S4, the obtaining the positioning of the vehicle through the LDSW gateway includes the following steps:
s41, the vehicle-mounted positioning module sends a positioning request signal to an LDSW gateway near the vehicle, and the LDSW gateway near the vehicle forwards the positioning request signal to the traffic management module;
s42, the vehicle position calculation unit screens 3 gateways closest to the vehicle according to the sending time of the positioning request signal and the receiving time of the positioning request signal;
specifically, the vehicle position calculating unit calculates the time difference between the sending time and the receiving time, and selects 3 gateways with the shortest corresponding time difference as screening results;
s43, the vehicle position calculating unit calculates the vehicle position through a trilateral ranging positioning method according to the positioning of the 3 gateways and sends the calculation result to the traffic flow signal generating unit;
specifically, the location of the gateway is known information; the trilateration positioning method is the prior art and is not described in detail herein;
s44, the traffic flow signal generating unit converts the calculation result into a positioning result signal and sends the positioning result signal to the traffic flow analyzing unit, the traffic flow predicting unit and the positioning signal receiving unit;
s45, the traffic flow analysis unit generates a corresponding congestion index; the traffic flow prediction unit generates a corresponding prediction congestion index; the positioning signal receiving unit decodes the positioning result signal and then sends the decoding result to the map matching unit, so that the position of the vehicle in the map is obtained.
Still further, the traffic flow analysis unit generates a congestion index of a traveling direction of a road section where each ID is located, comprising the steps of:
s61, acquiring the motion state, the running speed and the lane of the vehicle corresponding to each ID according to the information sent by the LDSW label corresponding to each ID;
specifically, the motion state and the running speed of the vehicle are stored in the information storage unit, and the lane where the vehicle is located can be obtained by combining the lane where the vehicle obtained by the monitoring camera enters the current road section and the number of lane changing times and the lane changing direction of the vehicle stored in the information storage unit;
s62, judging the running direction of the vehicle corresponding to each ID according to the acquired motion state of the vehicle;
and S63, generating congestion indexes of the running direction of the road section where the vehicle corresponding to each ID is located according to the related information.
Specifically, the larger the congestion index, the more congested the road.
Further, the display unit comprises a multi-mode positioning display unit, a digital map marking unit, a congestion threshold judging unit and a digital map color conversion unit, wherein the multi-mode positioning display unit is used for displaying a positioning result of GPS positioning or positioning of a vehicle on a digital map through an LDSW gateway, specifically, when the positioning signal receiving unit judges that the quality of GPS signals accords with the standard, the positioning result of GPS positioning is used, and when the quality of GPS signals does not accord with the standard, the positioning result obtained by the LDSW gateway is used; the digital map marking unit is used for marking a congestion index or a predictive congestion index of each road section in each driving direction; the congestion threshold judging unit is used for judging whether the congestion index or the predicted congestion index of each road section in each driving direction exceeds a specified threshold; the digital map color conversion unit is used for marking different colors on different road sections on the digital map according to the judgment result of the congestion threshold judgment unit.
Specifically, the number of the thresholds set by the congestion threshold judging unit is multiple, and the digital map color converting unit marks the digital map with colors according to the threshold range of the index, so that the vehicle owner can more easily distinguish the congestion degree of different road sections, for example, the vehicle owner is mauve when exceeding the maximum threshold, the vehicle owner is red when exceeding the larger threshold and being smaller than the maximum threshold, the vehicle owner is yellow when exceeding the smaller threshold and being smaller than the larger threshold, and the vehicle owner is green when not exceeding any threshold.
The beneficial effect of this scheme: 1. by adopting the LDSW technology, the LDSW label and the gateway are arranged, so that the gateway can receive the relevant information of the vehicle through the LDSW, thereby helping the traffic management module to carry out traffic management, and the LDSW label is normally in a sleep state and can start working only when a wake-up signal is received, the power consumption is less, and the traffic management module is beneficial to saving energy.
2. The vehicle is positioned by adopting two positioning modes, so that the stability and diversity of vehicle positioning are improved, the vehicle can be accurately positioned when GPS signals are poor, and the traffic management module can accurately control the position of the vehicle under various conditions.
3. By setting the congestion index, traffic managers can accurately control the congestion condition of each road and take corresponding traffic control measures, and owners can know the congestion conditions of different roads, so that a moving route is planned.
Embodiment two: this embodiment should be understood to include all the features of any one of the foregoing embodiments, and be further improved on the basis thereof, and further in that the traffic flow prediction unit generates, for each ID, a predicted congestion index after the traveling direction of the road section in which it is located passes through the prediction time t, including the steps of:
s71, acquiring a predicted congestion index of a next road section which can enter in the running direction according to the road section in which the vehicle corresponding to the ID is located and the running direction of the vehicle;
specifically, when the next road section of the vehicle has a plurality of possible road sections, generating predictive congestion indexes of the plurality of possible road sections;
s72, a predicted congestion index is generated according to the following formula;
YCZB=；
wherein YCZB is a predicted congestion index, d is a predicted value of the total number of vehicles moving on the next road section after the predicted time t,a current congestion index for the next road section;
specifically, the current congestion index is obtained in the same manner as the ZB;
specifically, d may be obtained by:
s721, acquiring a total number N of vehicles that may enter the next road section in the traveling direction and a current number M of vehicles of the next road section according to the number of vehicles on lanes of the remaining road section connected to the entrance of the next road section;
s722, obtaining a value of d according to the following formula:
d=；
wherein,for the predicted value of the number of vehicles entering the next road section after the predicted time t +.>A predicted value for the number of vehicles leaving from the next road section after the predicted time t has elapsed;
of the N vehicles, the number of vehicles satisfying the following formula:
（t-）*s>/>；
wherein t is the predicted time,for the duration of the red light experienced by a vehicle entering the next road section in the driving direction within the predicted time, s is the current speed of the vehicle entering the next road section in the driving direction, and D is the distance from the vehicle entering the next road section in the driving direction to the exit of the road section where the vehicle is located, wherein the distance can be obtained according to the current positioning of the vehicle;
of the M vehicles, the number of vehicles satisfying the following formula:
（t-）*ss/>DD；
wherein t is the predicted time,for the duration of the red light experienced by the vehicle in the next road section in the predicted time,/>For the current speed of the vehicle at the next road section, DD is the distance from the vehicle at the next road section to the exit of the road section where the DD is located, and the distance can be obtained according to the current positioning of the vehicle;
specifically, the predicted time may be a multiple of 10, such as 10 minutes, 20 minutes, or the like.
The beneficial effects of this embodiment are: the method has the advantages that the congestion degree visualization of different road sections after different prediction time can be obtained through setting the prediction congestion index, traffic managers can predict the congestion condition of each road, corresponding traffic control measures are adopted, owners can know the future congestion condition of different roads, and accordingly moving routes are planned.
Embodiment III: this embodiment should be understood to include all the features of any one of the foregoing embodiments and be further improved on the basis thereof, and in S3, the determining by the positioning signal receiving unit whether the GPS signal quality meets the criterion includes the steps of:
s31, performing noise reduction processing on the GPS signals;
s32, acquiring GPS signal quality indexes according to the following formula:
=/>*/>；
wherein,for the GPS signal quality index, X is the number of GPS signals received by the positioning signal receiving unit, ++>Noise power for the x-th GPS signal received by the positioning signal receiving unit,/for the positioning signal receiving unit>For the signal power of the x-th GPS signal received by the positioning signal receiving unit,/for the positioning signal receiving unit>Signal delay between the x-th GPS signal received by the positioning signal receiving unit and the first GPS signal received by the positioning signal receiving unit;
specifically, the GPS signal may generate a multipath effect during the propagation process, so that the positioning signal receiving unit receives a plurality of signals when receiving the GPS signal;
s33, if the GPS signal quality index is smaller than the set GPS signal quality threshold, the quality of the GPS signal does not accord with the standard; otherwise, the quality of the GPS signal meets the standard.
Specifically, the GPS signal quality threshold is set by one skilled in the art.
The beneficial effects of this embodiment are: the vehicle is positioned by using the GPS under the general condition, but the GPS signals are weaker in signals in certain areas and cannot be positioned normally, in this case, the LDSW gateway is adopted to position the vehicle to make up for the defect of GPS positioning, the vehicle can be positioned accurately even in the places with weaker GPS signals, and when the signal quality of the GPS does not meet the standard, the vehicle can be effectively ensured to be always in a state with a known position by adopting the multi-mode positioning method, so that the traffic management efficiency is improved.
The foregoing disclosure is only a preferred embodiment of the present invention and is not intended to limit the scope of the invention, so that all equivalent technical changes made by applying the description of the present invention and the accompanying drawings are included in the scope of the present invention, and in addition, elements in the present invention can be updated as the technology develops.
Claims (5)
1. The multi-mode positioning traffic management system of the LDSW intelligent tag is characterized by comprising the LDSW intelligent tag, a vehicle-mounted positioning module, an LDSW gateway and a traffic management module; the LDSW label comprises a vehicle information storage unit, an LDSW signal receiving unit and an LDSW signal transmitting unit, wherein the vehicle information storage unit is used for storing related information of a vehicle, the related information comprises a license plate number, a vehicle owner identity and a vehicle model, the LDSW signal receiving unit is used for receiving a wake-up signal from an LDSW gateway, and the LDSW signal transmitting unit is used for transmitting the content stored by the vehicle information storage unit to the LDSW gateway; the LDSW gateway is used for receiving information from the LDSW label and the traffic management module and forwarding the information; the vehicle-mounted positioning module is used for positioning the position of the vehicle according to the GPS signals; the traffic management module is used for analyzing the vehicle congestion condition of each road section according to the signals from the LDSW gateway and generating corresponding countermeasures;
the traffic management module comprises a traffic flow analysis unit which is used for generating congestion indexes of the running direction of the road section where the vehicle is located according to the following formula:
ZB=；
wherein ZB is a congestion index, DIS is the total length of the road section, A is the number of lanes in the running direction of the road section where the vehicle is located, and a is the total number of vehicles in the running direction of the road section where the vehicle is located;for the first weight, ++>The method comprises the steps of carrying out a first treatment on the surface of the b is the number of vehicles stopped beside the lane where the vehicle is traveling in the road section; />A moving speed of an i-th vehicle moving in the traveling direction for the road section; />The speed limit of the lane where the ith vehicle moving in the driving direction of the road section is located; e is a natural constant; c is the total number of sidewalks traversing the road segment; the LDSW label further comprises a judging unit and a wake-up unit; the judging unit is configured to judge whether the signal received by the LDSW signal receiving unit is a wake-up signal, and the judging method is as follows: the judging unit compares the frequency, the modulation mode and the coding mode of the received signal with the regulations in the communication protocol so as to judge whether the received signal is a wake-up signal or not; the awakening unit is used for awakening the rest part of the LDSW label according to the judging result of the judging unit; the vehicle-mounted positioning module comprises a positioning signal receiving unit, a position obtaining unit, a map matching unit, a decoding unit and a display unit; the positioning signal receiving unit is used for receiving positioning signals according to GPS signals, and the position acquisition unit is used for calculating geographic position information of the vehicle according to the positioning signals of the positioning signal receiving unit; the map matching unit is used for matching the geographic position information with the digital map so as to determine the exact position of the vehicle on the map; the decoding unit is used for receiving the traffic flow signal from the LDSW gateway and decoding the traffic flow signal; the display unit is used for displaying a digital map with the vehicle position according to the exact position of the vehicle on the map and displaying the congestion degree of each road section near the position of the vehicle according to the decoded traffic flow signal; the LDSW gateway is arranged at each intersection covered by the multi-mode positioning traffic management system, and the traffic management module comprises a vehicle position calculation unit, a traffic flow analysis unit, a traffic flow prediction unit, a traffic flow signal generation unit and an emergency response unit; the vehicle position calculation unit is used for calculating the vehicle position according to the signals of the LDSW gateway; the traffic flow analysis unit is used for calculating according to the vehicle position calculation unit or the position acquisition unitObtaining vehicle information of a related road as a result, and analyzing the congestion degree of the current road according to the vehicle information; the traffic flow prediction unit is used for predicting the future congestion degree of the road; the traffic flow signal generating unit is used for generating a traffic flow signal according to the analysis result of the traffic flow analysis unit and the prediction result of the traffic flow prediction unit, and the traffic flow signal is used for representing the congestion degree of the road and the future congestion degree of the road; the emergency response unit is used for giving an alarm and generating corresponding emergency measures when the congestion degree of the road or the future congestion degree exceeds a specified threshold value.
2. A multi-mode location traffic management system of LDSW smart tags according to claim 1, wherein the workflow of the traffic management system comprises the steps of:
s1, an LDSW gateway sends a wake-up signal to an LDSW label;
s2, the LDSW label recognizes the wake-up signal and sends the information in the information storage unit to the LDSW gateway;
s3, the positioning signal receiving unit judges whether the GPS signal quality meets the standard, if so, the positioning signal receiving unit obtains the positioning of the vehicle through the GPS signal and sends the positioning signal to the traffic flow analysis unit and the traffic flow prediction unit and executes S5, otherwise, S4 is executed;
s4, the vehicle position calculating unit calculates the vehicle position according to the signals of the LDSW gateway and sends the vehicle position to the traffic flow analyzing unit and the traffic flow predicting unit to execute S5;
s5, the LDSW gateway collects information of LDSW labels from different vehicles, generates corresponding IDs according to the information sent by the LDSW labels, and sends the IDs to the traffic management module;
s6, the traffic flow analysis unit generates congestion indexes of the running direction of the road section where each ID is located for each ID; the congestion index is used for representing the congestion degree of the road;
s7, the traffic flow prediction unit generates a predicted congestion index of each ID after the predicted time t of the traveling direction of the road section where the traffic flow prediction unit is located; the prediction congestion index is used for representing the future congestion degree of the road;
and S8, the traffic flow signal generating unit generates traffic flow signals according to the indexes generated in the S6 and the S7 and sends the traffic flow signals to the LDSW gateway, the LDSW gateway forwards the traffic flow signals to the vehicle-mounted positioning module of the vehicle corresponding to each ID, the decoding unit decodes the traffic flow signals, and the display unit displays the congestion index and the predictive congestion index.
3. A multi-mode location traffic management system of LDSW smart tags according to claim 2, wherein in S4, the vehicle location calculation unit calculates the vehicle location according to the signal of the LDSW gateway comprises the steps of:
s41, the vehicle-mounted positioning module sends a positioning request signal to an LDSW gateway near the vehicle, and the LDSW gateway near the vehicle forwards the positioning request signal to the traffic management module;
s42, the vehicle position calculation unit screens 3 gateways closest to the vehicle according to the sending time of the positioning request signal and the receiving time of the positioning request signal;
s43, the vehicle position calculating unit calculates the vehicle position through a trilateral ranging positioning method according to the positioning of the 3 gateways and sends the calculation result to the traffic flow signal generating unit;
s44, the traffic flow signal generating unit converts the calculation result into a positioning result signal and sends the positioning result signal to the traffic flow analyzing unit, the traffic flow predicting unit and the positioning signal receiving unit;
s45, the traffic flow analysis unit generates a corresponding congestion index; the traffic flow prediction unit generates a corresponding prediction congestion index; the positioning signal receiving unit decodes the positioning result signal and then sends the decoding result to the map matching unit, so that the position of the vehicle in the map is obtained.
4. A multi-mode location traffic management system of LDSW smart tags according to claim 3, wherein the traffic flow analysis unit generates congestion index of the traveling direction of the road section where each ID is located, comprising the steps of:
s61, acquiring the motion state, the running speed and the lane of the vehicle corresponding to each ID according to the information sent by the LDSW label corresponding to each ID;
s62, judging the running direction of the vehicle corresponding to each ID according to the acquired motion state of the vehicle;
and S63, generating congestion indexes of the running direction of the road section where the vehicle corresponding to each ID is located according to the related information.
5. The multi-mode positioning traffic management system of the LDSW intelligent tag according to claim 4, wherein the display unit comprises a multi-mode positioning display unit, a digital map marking unit, a congestion threshold judging unit and a digital map color converting unit, wherein the multi-mode positioning display unit is used for displaying the positioning result of the GPS positioning or acquiring the positioning of the vehicle on the digital map through the LDSW gateway; the digital map marking unit is used for marking a congestion index or a predictive congestion index of each road section in each driving direction; the congestion threshold judging unit is used for judging whether the congestion index or the predicted congestion index of each road section in each driving direction exceeds a specified threshold; the digital map color conversion unit is used for marking different colors on different road sections on the digital map according to the judgment result of the congestion threshold judgment unit.
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