CN107085961A - A kind of method and system of car-mounted terminal, acquisition crossing traffic signal control information - Google Patents
A kind of method and system of car-mounted terminal, acquisition crossing traffic signal control information Download PDFInfo
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- G—PHYSICS
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- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
- G08G1/09623—Systems involving the acquisition of information from passive traffic signs by means mounted on the vehicle
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Abstract
The invention discloses a kind of method for obtaining crossing traffic signal control information, wherein, including：Wireless communication connection is set up with the roadside unit of current location；Receive the traffic signal control information in each import direction of the intersection at the current time for the process digital signature that roadside unit is periodically sent；The traffic signal control information in the traveling import direction for obtaining current time is screened according to Current vehicle travel direction；Traffic signal control information to the traveling import direction at the current time Jing Guo digital signature is digitally signed checking；When digital signature authentication by when, confirm that the traffic signal control information in the traveling import direction at current time is credible；Show the traffic signal control information in the traveling import direction at the current time.The invention also discloses a kind of car-mounted terminal and a kind of system of acquisition crossing traffic signal control information.The method for the acquisition crossing traffic signal control information that the present invention is provided improves the confidence level and security of interactive information.
Description
Technical Field
The invention relates to the technical field of intelligent traffic, in particular to a method for acquiring intersection traffic signal control information, a vehicle-mounted terminal and a system for acquiring the intersection traffic signal control information, wherein the system comprises the vehicle-mounted terminal.
Background
The 25 th regulation of the road traffic safety act states that "unified road traffic signals are carried out nationwide", and the national mandatory standards "road traffic signal setting and installation Specifications (GB 14886-. The traffic signal controller installed at the intersection is used for controlling and displaying traffic signal lamps in different directions, and is also used for controlling a countdown display and a variable lane mark on an entrance lane. At present, a traffic signal controller for domestic large and medium-sized cities is basically in a networking control mode, namely, the traffic signal controller is remotely controlled and managed by a central-level or regional-level traffic signal control system, but only about 20% of small and medium-sized cities use a countdown display at part of intersections for displaying red light waiting time or green light remaining time in different directions, so that drivers cannot know the current red light waiting time or green light remaining time of intersections under most conditions. In some large and medium-sized cities, variable lane real-time control is implemented at some special intersections to adapt to the condition that the change of a certain turning traffic flow is obvious in a certain time period, so that the passing efficiency of the intersections is improved.
At present, the internet of things technology, the car networking technology and the artificial intelligence technology develop rapidly, the future car networking technology is the core and the foundation of an intelligent traffic system, and the vehicle-road cooperation and information interaction are realized based on the technologies such as wireless communication and sensing detection, so that the purposes of optimizing and utilizing road resources and improving the road traffic safety are achieved.
In the car networking technology, how to let the car or the driver know or accurately identify the traffic signal control information (including the traffic signal status information and the variable lane indication sign status information) of the front intersection in advance is the key point, and meanwhile, the obtained information is credible and time-efficient. Currently, various forms of identification technologies or information perception technologies are proposed internationally, and these technologies include a vision sensor identification technology, a short-range wireless communication technology, and a 4G mobile internet technology. Enterprises such as google, Baidu, Tesla and the like adopt a camera and a high-precision electronic map based on a visual sensor identification technology, and identify and judge the color of a traffic signal according to the number and the size of red, yellow and green spots in a video image (for example, the invention patent US9145140B 2' obtained by the google company in 2013, namely a method and equipment for detecting the traffic signal and the associated state thereof). However, in the invention patent US20140129121a1 "Routing based on detected traffic lights" obtained in 2014 by apple inc, based on a real-time crowdsourcing collection technology, the specific position and state of a traffic light are determined by collecting and analyzing travel data uploaded from different mobile terminals (iPhone and the like), and traffic lights and travel time on a route are calculated, so that the shortest route is provided for a user and the time required by a destination to reach the destination is displayed. These techniques and methods have the following disadvantages: firstly, the color remaining time of the current traffic signal lamp cannot be obtained (the countdown displays are not installed on the signal lamps of most intersections at home and abroad, and the countdown numbers changing every second are difficult to accurately identify by a video camera); and secondly, the color state of the traffic signal lamp is difficult to accurately identify under severe weather conditions. And the safety certification mechanism is not considered in relevant patents and applications for acquiring the states of traffic lights based on the vehicle-road cooperation technology abroad. The invention relates to a city level crossing in-car signal indicating system based on vehicle-road cooperation, a invention patent 201410157544.9, a invention patent 201410306450.3, an engine start-stop control system based on vehicle-road cooperation and a method thereof, a invention patent 201210139864.2, a vehicle-road cooperation early warning system with a rapid passing prompt function and an early warning method thereof, a invention patent 201610807902.5, a signal lamp state terminal display method and a system based on vehicle-road cooperation technology, a utility model patent 201620739614.6, an active safety early warning device based on vehicle-road cooperation and 4G network, academia of Shipeng and the like, a vehicle-mounted traffic signal lamp state acquisition system design based on ZigBee, a high auspicious thesis of cigarette desk university at signal crossing passing method research under vehicle networking environment and the like, wherein although wireless communication is adopted to realize transmission and reception of crossing traffic signal lamp state information, how to ensure that the received traffic signal lamp state information by a vehicle-mounted terminal is credible is not considered, and a transmission method for realizing the state information of the variable lane marker at the intersection is not provided.
Therefore, how to safely acquire the traffic signal control information becomes an urgent technical problem to be solved.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art, and provides a method for acquiring intersection traffic signal control information, a vehicle-mounted terminal and a system for acquiring the intersection traffic signal control information, wherein the system comprises the vehicle-mounted terminal, so as to solve the problems in the prior art.
As a first aspect of the present invention, there is provided a method of acquiring intersection traffic signal control information, wherein the method comprises:
establishing wireless communication connection with a road side unit at the current position;
receiving traffic signal control information of each entrance direction of the intersection at the current moment after the road side unit periodically sends the traffic signal control information through the digital signature;
screening according to the current vehicle driving direction to obtain traffic signal control information of the driving inlet direction at the current moment;
carrying out digital signature verification on the traffic signal control information of the driving inlet direction at the current moment after the digital signature;
when the digital signature passes verification, confirming that the traffic signal control information of the driving direction at the current moment is credible;
and displaying the traffic signal control information of the driving inlet direction at the current moment.
Preferably, the traffic signal control information includes traffic signal light status information, variable lane indicator flag information, and timestamp information, wherein the traffic signal light status information includes each import direction number, a left turn signal light color remaining time, a straight going signal light color remaining time, a right turn signal light color, and a right turn signal light color remaining time, the variable lane indicator flag information includes each import direction number, a variable lane current indication direction, a variable lane current indication remaining time, and an information generation timestamp, and the left turn signal light color, the straight going signal light color, and the right turn signal light color all include red, green, and yellow.
Preferably, the method further comprises, after the step of displaying the traffic signal control information of the driving direction at the current time:
and when the displayed remaining time of the current light color is less than or equal to 5 seconds, sending a prompt signal.
Preferably, the number of each of the entry directions is related to the number of roads accessed by the intersection.
As a second aspect of the present invention, there is provided a vehicle-mounted terminal, wherein the vehicle-mounted terminal includes:
the wireless communication module is used for establishing wireless communication connection with the road side unit at the current position;
the receiving module is used for receiving traffic signal control information of all inlet directions of the intersection at the current moment after the road side unit periodically sends the traffic signal control information through the digital signature;
the information screening module is used for screening and obtaining the traffic signal control information of the driving inlet direction at the current moment according to the current vehicle driving direction;
the safety module is used for carrying out digital signature verification on the traffic signal control information of the driving inlet direction at the current moment after the digital signature;
the confirmation module is used for confirming that the traffic signal control information of the driving direction at the current moment is credible when the digital signature passes verification;
and the display module is used for displaying the traffic signal control information of the driving inlet direction at the current moment.
Preferably, the in-vehicle terminal further includes:
and the prompting module is used for sending a prompting signal when the displayed remaining time of the current light color is less than or equal to 5 seconds.
Preferably, the prompt signal comprises a digital flashing prompt signal or an audible warning prompt signal.
Preferably, the wireless communication module comprises a DSRC communication module, a LET-V communication module, or a 4G/5G communication module.
Preferably, the display module comprises an automobile instrument panel or an in-vehicle terminal display.
As a third aspect of the present invention, there is provided a system for acquiring intersection traffic signal control information, wherein the system comprises:
a traffic signal controller, a road side unit and the vehicle-mounted terminal;
the traffic signal controller is in communication connection with the road side unit and is used for digitally signing traffic signal control information of the intersection and sending the digitally signed traffic signal control information of the intersection to the road side unit;
the road side unit is in wireless communication connection with the vehicle-mounted terminals and is used for periodically sending traffic signal control information of the intersection passing through the digital signature outwards under the control of the traffic signal controller.
According to the method and the system for acquiring the intersection traffic signal control information, the vehicle-mounted terminal can be in wireless communication with the road side unit, and the data interaction information of the vehicle-mounted terminal and the road side unit is authenticated by the digital signature, so that a hacker and a pseudo base station can be prevented from issuing false traffic signal lamp states and the like, the problem that video reading is inaccurate in severe weather is avoided, the reliability and the safety of interaction information are improved, and the vehicle-mounted terminal can safely acquire the traffic signal control information.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of a method for acquiring intersection traffic signal control information according to the present invention.
Fig. 2 is a schematic structural diagram of the vehicle-mounted terminal provided by the invention.
Fig. 3 is another schematic structural diagram of the vehicle-mounted terminal provided by the invention.
Fig. 4 is a schematic diagram of a traffic signal lamp state display mode at the road junction of the vehicle-mounted terminal provided by the invention.
Fig. 5 is a schematic structural diagram of a system for acquiring intersection traffic signal control information according to the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
As a first aspect of the present invention, there is provided a method of acquiring intersection traffic signal control information, wherein, as shown in fig. 1, the method includes:
s110, establishing wireless communication connection with a road side unit at the current position;
s120, receiving traffic signal control information of each entrance direction of the intersection at the current moment after the road side unit periodically sends the traffic signal control information through the digital signature;
s130, screening according to the current vehicle driving direction to obtain traffic signal control information of the driving inlet direction at the current moment;
s140, carrying out digital signature verification on the traffic signal control information of the driving inlet direction at the current moment after the digital signature;
s150, when the digital signature passes verification, confirming that the traffic signal control information of the driving entrance direction at the current moment is credible;
and S160, displaying the traffic signal control information of the driving inlet direction at the current moment.
According to the method for acquiring the intersection traffic signal control information, the vehicle-mounted terminal can be in wireless communication with the road side unit, and the data interaction information of the vehicle-mounted terminal and the road side unit is authenticated by the digital signature, so that a hacker and a pseudo base station can be prevented from issuing false traffic signal lamp states and the like, the problem that video reading is inaccurate in severe weather is avoided, the reliability and the safety of the interaction information are improved, and the vehicle-mounted terminal can safely acquire the traffic signal control information.
Specifically, the traffic signal control information includes traffic signal light state information, variable lane indicator flag information, and timestamp information, where the traffic signal light state information includes each import direction number, a left turn signal light color remaining time, a straight going signal light color remaining time, a right turn signal light color, and a right turn signal light color remaining time, the variable lane indicator flag information includes each import direction number, a variable lane current indication direction, a variable lane current indication remaining time, and an information generation timestamp, and the left turn signal light color, the straight going signal light color, and the right turn signal light color all include red, green, and yellow.
It should be noted that when the digital signature verification fails, the traffic signal control information in the driving entrance direction at the current time is discarded
According to the method for acquiring the intersection traffic signal control information, the variable lane indication mark information is arranged in the traffic signal control information, so that the vehicle-mounted terminal can know the state of the variable lane by acquiring the information, and convenience is provided for a driver to drive.
Further specifically, the method further comprises, after the step of displaying the traffic signal control information of the driving inlet direction at the current time:
and when the displayed remaining time of the current light color is less than or equal to 5 seconds, sending a prompt signal.
Specifically, the detailed steps of the method for acquiring intersection traffic signal control information provided by the invention comprise the following steps:
(a) the road side traffic signal controller periodically broadcasts (issues) traffic signal control information (including information such as a traffic signal lamp display state, variable lane mark display information and a time stamp) and corresponding digital signature information through a wireless communication module of a Road Side Unit (RSU);
(b) the automobile entering the signal coverage area receives related information by using a wireless communication module of an on-board terminal (OBU), filters invalid (or invalid) information by using attribute information such as driving position, direction and the like, and only reserves traffic signal control information and the like in the direction i of the entrance. E.g. current time T-timestamp TSAnd when the time is more than or equal to 5 seconds, the received information can be judged as failure information which exceeds the time limit.
(c) The running automobile is subjected to safety verification through a safety module of the vehicle-mounted terminal and a secret key thereof to obtain credible traffic signal control information, and front left-turn, straight-going and right-turn signal lamp state real-time information or variable lane mark state information is displayed on an automobile instrument panel or a terminal display in a matching manner, and if the safety verification is unsuccessful, the received information is abandoned;
preferably, the security module and the key of the vehicle-mounted terminal can also directly use the existing SM7 cryptographic security algorithm and key in the automobile electronic identification chip which is being promoted by the public security organization.
(d) When the color (phase) of the signal lamp changes for several seconds, the automobile and the driver are reminded to select a correct operation mode to drive in time. Wherein: the reminding mode comprises that digital flashing display or sound early warning prompt is adopted for seconds before the color of the signal lamp changes (the remaining time of the current color of the signal lamp is displayed in real time is less than or equal to 5 seconds).
(e) After the automobile leaves the intersection, the information sent by the intersection traffic signal controller is filtered, and the traffic signal control information sent by the next intersection is ready to be received.
It should be noted that the number of each entrance direction is related to the number of roads accessed by the intersection. For example, for the type of the intersection to be T-type or Y-type, the above-mentioned inlet directions i are only three, i e ∈ {1, 2, 3 }; and if 5 roads are accessed at the intersection, i belongs to {1, 2, 3, 4, 5 }.
Therefore, the method for acquiring the intersection traffic signal control information solves the problem of mutual information credibility commonly existing in the current application cases and patents of vehicle-road cooperation V2I, avoids hackers and fake base stations from issuing false traffic signal lamp states and the like, avoids the problem of inaccuracy of video reading in severe weather, enables the vehicle-mounted terminal to acquire the traffic signal lamp states which are sent by an intersection traffic signal controller and are authenticated by digital signatures, and enables the vehicle and drivers to master the information of the current green light passing remaining time, red light waiting time, variable lane marking states and the like of the front intersection, make correct judgment and driving operation, and ensure the running safety of the vehicle. In addition, aiming at the current situation of signal lamp setting at different intersections, the related information of the signal lamp for right turn, straight going and right turn can be displayed according to three display modes, and the problem of multi-phase signal lamp state display is solved.
As a second aspect of the present invention, there is provided a vehicle-mounted terminal, wherein, as shown in fig. 2, the vehicle-mounted terminal 30 includes:
the wireless communication module 31, the wireless communication module 31 is used for establishing wireless communication connection with the road side unit at the current position;
a receiving module 32, where the receiving module 32 is configured to receive traffic signal control information, which is periodically sent by the road side unit and passes through the digitally signed intersection at the current time, in each entrance direction of the intersection;
the information screening module 33 is used for screening and obtaining the traffic signal control information of the driving inlet direction at the current moment according to the current vehicle driving direction;
the security module 34 is used for performing digital signature verification on the traffic signal control information of the driving inlet direction at the current time after the digital signature is performed on the traffic signal control information;
the confirming module 35 is used for confirming that the traffic signal control information of the driving entrance direction at the current moment is credible when the digital signature is verified;
and the display module 36, wherein the display module 36 is configured to display the traffic signal control information of the driving inlet direction at the current moment.
The vehicle-mounted terminal provided by the invention can be in wireless communication with the road side unit, and the data interaction information of the vehicle-mounted terminal and the road side unit is authenticated by the digital signature, so that a hacker and a pseudo base station can be prevented from issuing false traffic signal lamp states and the like, the problem that video reading is inaccurate in severe weather is avoided, the reliability and the safety of the interaction information are improved, and the vehicle-mounted terminal can safely acquire traffic signal control information.
Further, as shown in fig. 3, the in-vehicle terminal 30 further includes:
and the prompt module 37, wherein the prompt module 37 is used for sending a prompt signal when the displayed remaining time of the current light color is less than or equal to 5 seconds.
Specifically, the prompt signal comprises a digital flashing prompt signal or a sound early warning prompt signal.
Preferably, the wireless communication module 31 includes a DSRC communication module, a LET-V communication module, or a 4G/5G communication module.
Preferably, the display module 36 includes a dashboard of a car or a display of a car terminal.
In order to more clearly understand the working principle of the vehicle-mounted terminal provided by the invention, the following describes the vehicle-mounted terminal provided by the invention in further detail by combining the drawings and the specific embodiments and assuming that the intersection is an intersection.
As shown in fig. 4, corresponding to the related regulations of the national standard GB 14886-; the display mode B is used for displaying the state information of the intersection signal lamps with independent left-turn control phases, so that only 1 group of disc signal lamps, 1 group of left-turn direction indicating signal lamps and 2 timing displays are displayed; the display mode C is used for displaying intersection signal lamp status information provided with independent left-turn and right-turn control phases, and therefore 1 group of disc signal lamps, 1 group of left-turn direction indication signal lamps, 1 group of right-turn direction indication signal lamps and 3 independent timing displays need to be displayed.
As shown in fig. 5, the drive test equipment mainly includes a road traffic signal controller 10 and a drive test unit 20, where the road traffic signal controller 10 includes a main control module 11, a lamp control module 12 and a first communication module 13, and the drive test unit 20 mainly includes a second communication module 21, so that at the roadside equipment:
first, the main control module 11 of the Roadside Traffic Signal Controller (RTSC) transmits the traffic signal light state information/variable lane indication sign information SS of the current entrance direction iiAnd carrying out asymmetric encryption operation on the ID of the traffic signal controller equipment to form a character string DMiI.e. DMi＝AE(ID，SSi，Pkey)，
AE is a certain asymmetric encryption operation function, Pkey is an encryption public key, and the encryption algorithm and the public key are built in a main control module of a traffic signal controller; traffic signal lamp display state information SSiI (import direction number) (left turn signal lamp color LC)iTime remaining for lamp color RTi 1) (straight-going signal lamp color SCiTime remaining for lamp color RTi 2) (Right turn signal lamp color RCiTime remaining for lamp color RTi 3) Generating time stamp TS for informationiAnd variable lane marker display information SSi(number i of entrance direction, current indication direction LD of variable lane ═ 1iAnd the remaining time RTiGenerating time stamp TS for informationi}. When a certain turn signal lamp is not available, the turn signal lamp color LC and the lamp color remaining time LT are both set to be zero; the intersection traffic signal control machine without variable lane control does not broadcast the information.
Secondly, the digitally signed traffic signal control information (i.e. SS) of each entrance direction of the intersection is periodically and repeatedly broadcasted (distributed) through the second communication module 21 of the Road Side Unit (RSU)iAnd DMi) Lasting 2 to 5 seconds, and then returning to regenerate the current traffic signal control information.
As described above, the structure of the in-vehicle terminal 30 is known, and therefore, at the end of the in-vehicle terminal 30, specifically:
in the first step, the wireless communication module 31 of the on-board terminal (OBU) receives the signal sent by the roadside traffic signal control device in real time, performs filtering processing and judgment (for example, the judgment can be made according to the vehicle driving direction and the position information of the roadside traffic signal control device), and receives only the traffic signal control information (i.e., SS) in the front entrance direction iiAnd DMi) (ii) a The asymmetric cryptographic algorithm and the decryption private Key Rri _ Key built in the security module 34 of the vehicle-mounted terminal 30 are utilized to perform digital signature security verification on the received information, namelyWherein,and (4) carrying out exclusive-or operation. When DM'iIf the safety verification is successful, the SS obtained by analysis is obtainediAnd TSiIs authentic information; when DM'iAnd if the security verification is unsuccessful, abandoning the received information, and repeating the first step of work.
In the second step, the display module 36 (generally referred to as a vehicle-mounted terminal display or a dashboard) of the vehicle-mounted terminal 30 displays the left-turn, straight-going and right-turn signal light status real-time information (including the current light color status and the light color remaining time) or the variable lane marker status information (including the left-turn, straight-going or right-turn indication, and the remaining time) of the front entrance direction i in a matching manner. The displayed current light color state is still represented by red, yellow and green, and the remaining time delta T of a certain turning j is displayedi jFor the acquired lamp color remaining time- (current time T-timestamp), j ═ 1, 2, 3 represent left turn, straight run, and right turn, respectively). For example, the light color remaining time calculation formula of the straight lane (j ═ 2) is:
time remaining for lamp color of straight lane
If the calculated remaining time delta T of the variable lane marker light color is obtainedi jWhen the time is more than or equal to 100 seconds, the time is delta Ti jAnd taking a value of 99, namely displaying for 99 seconds at most on the vehicle-mounted display equipment.
Thirdly, the wireless communication module 31 of the vehicle-mounted terminal (OBU) acquires the latest traffic signal control information DMiBefore, the display module 38 decrements the display light color remaining time per second; otherwise, returning to the first step.
Fourthly, when the remaining time of the current light color is less than or equal to 5 seconds, the vehicle-mounted terminal (OBU) reminds a driver to pay attention to the light color conversion of the signal lamp and select correct driving operation in the modes of digital flicker, voice early warning prompt and the like; when the remaining time of the current light color is equal to 0, the phase content of the next signal is automatically updated and displayed.
It should be added that, for the type of the intersection being T-type or Y-type, there are only three inlet directions i, i is e {1, 2, 3 }; and if 5 roads are accessed at the intersection, i belongs to {1, 2, 3, 4, 5 }.
The description of the vehicle-mounted terminal provided by the present invention can refer to the description of the method for acquiring intersection traffic signal control information, and is not repeated herein.
As a third aspect of the present invention, there is provided a system for acquiring intersection traffic signal control information, wherein, as shown in fig. 5, the system 1 includes:
a traffic signal controller 10, a roadside unit 20, and the aforementioned vehicle-mounted terminal 30;
the traffic signal controller 10 is in communication connection with the roadside unit 20, and the traffic signal controller 10 is configured to digitally sign traffic signal control information at an intersection and send the digitally signed traffic signal control information at the intersection to the roadside unit 20;
the road side unit 20 is connected with the plurality of vehicle-mounted terminals 30 in a wireless communication manner, and is configured to periodically send traffic signal control information of intersections passing through the digital signature to the outside under the control of the traffic signal controller 10.
According to the system for acquiring the traffic signal control information of the intersection, the vehicle-mounted terminal can be in wireless communication with the road side unit, and the data interaction information of the vehicle-mounted terminal and the road side unit is authenticated by the digital signature, so that a hacker and a pseudo base station can be prevented from issuing false traffic signal lamp states and the like, the problem that video reading is inaccurate in severe weather is avoided, the reliability and the safety of the interaction information are improved, and the vehicle-mounted terminal can safely acquire the traffic signal control information.
Specifically, the traffic signal controller 10 installed at the roadside mainly includes a main control module 11, a lamp control module 12 and a first communication module 13, the roadside unit 20 mainly includes a second communication module 21, and the vehicle-mounted terminal 30 includes the structure described above. The traffic signal controller 10 performs network connection and data transmission with the second communication module 21 of the roadside unit 20 through the first communication module 13, and realizes display control of the color states of the signal lamps in each direction through the lamp control module 12; the road side unit 20 performs wireless communication and data transmission with the wireless communication module 31 of the vehicle-mounted terminal 30.
It should be noted that the main control module 11 of the traffic signal controller 10 includes a conventional traffic signal processing function, and further stores an asymmetric encryption algorithm, a secret key, and a unique traffic signal controller device code.
Preferably, the roadside unit 20 may be integrated into the traffic signal controller 10 to improve integration reliability and save equipment cost.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A method of obtaining intersection traffic signal control information, the method comprising:
establishing wireless communication connection with a road side unit at the current position;
receiving traffic signal control information of each entrance direction of the intersection at the current moment after the road side unit periodically sends the traffic signal control information through the digital signature;
screening according to the current vehicle driving direction to obtain traffic signal control information of the driving inlet direction at the current moment;
carrying out digital signature verification on the traffic signal control information of the driving inlet direction at the current moment after the digital signature;
when the digital signature passes verification, confirming that the traffic signal control information of the driving direction at the current moment is credible;
and displaying the traffic signal control information of the driving inlet direction at the current moment.
2. The method of claim 1, wherein the traffic signal control information includes traffic signal light status information, variable lane indicator flag information, and timestamp information, wherein the traffic signal light status information includes each of an ingress direction number, a left turn signal light color remaining time, a straight going signal light color remaining time, a right turn signal light color, and a right turn signal light color remaining time, wherein the variable lane indicator flag information includes each of an ingress direction number, a variable lane current indication direction, a variable lane current indication remaining time, and an information generation timestamp, and wherein each of the left turn signal light color, the straight going signal light color, and the right turn signal light color includes red, green, and yellow.
3. The method of claim 2, further comprising, after the step of displaying traffic signal control information for the direction of approach at the current time:
and when the displayed remaining time of the current light color is less than or equal to 5 seconds, sending a prompt signal.
4. A method according to claim 2, wherein the number of directions of entry is related to the number of roads accessed by the intersection.
5. A vehicle-mounted terminal, characterized in that the vehicle-mounted terminal comprises:
the wireless communication module is used for establishing wireless communication connection with the road side unit at the current position;
the receiving module is used for receiving traffic signal control information of all inlet directions of the intersection at the current moment after the road side unit periodically sends the traffic signal control information through the digital signature;
the information screening module is used for screening and obtaining the traffic signal control information of the driving inlet direction at the current moment according to the current vehicle driving direction;
the safety module is used for carrying out digital signature verification on the traffic signal control information of the driving inlet direction at the current moment after the digital signature;
the confirmation module is used for confirming that the traffic signal control information of the driving direction at the current moment is credible when the digital signature passes verification;
and the display module is used for displaying the traffic signal control information of the driving inlet direction at the current moment.
6. The in-vehicle terminal according to claim 5, wherein the in-vehicle terminal further comprises:
and the prompting module is used for sending a prompting signal when the displayed remaining time of the current light color is less than or equal to 5 seconds.
7. The vehicle-mounted terminal according to claim 6, wherein the prompt signal comprises a digital flashing prompt signal or a voice warning prompt signal.
8. The in-vehicle terminal of any of claims 5-7, wherein the wireless communication module comprises a DSRC communication module, a LET-V communication module, or a 4G/5G communication module.
9. The vehicle terminal according to any one of claims 5 to 7, wherein the display module comprises a dashboard of a vehicle or a vehicle terminal display.
10. A system for obtaining intersection traffic signal control information, the system comprising:
a traffic signal controller, a roadside unit, and the vehicle-mounted terminal of any one of claims 5 to 9;
the traffic signal controller is in communication connection with the road side unit and is used for digitally signing traffic signal control information of the intersection and sending the digitally signed traffic signal control information of the intersection to the road side unit;
the road side unit is in wireless communication connection with the vehicle-mounted terminals and is used for periodically sending traffic signal control information of the intersection passing through the digital signature outwards under the control of the traffic signal controller.
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