CN119545314A - A method and system for reducing adjacent channel interference in ETC system - Google Patents
A method and system for reducing adjacent channel interference in ETC system Download PDFInfo
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- CN119545314A CN119545314A CN202411701945.6A CN202411701945A CN119545314A CN 119545314 A CN119545314 A CN 119545314A CN 202411701945 A CN202411701945 A CN 202411701945A CN 119545314 A CN119545314 A CN 119545314A
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Abstract
本发明公开了一种降低ETC系统中邻道干扰的方法及系统，方法包括：利用ETC系统的RSU天线中集成的摄像头对所覆盖的当前车道和相邻车道的车辆图像进行识别；在识别到当前车道存在车辆时，打开当前车道的RSU天线搜索OBU单元发出的应答信号；在至少两个相邻的车道同时存在车辆时，对应车道的RSU天线采用相同的信道进行搜索；在OBU信号对应的车牌信息与当前车道所采集车辆图像的车牌信息匹配成功时，将当前车道的RSU天线与该OBU单元进行交易；在至少两个相邻的车道同时存在车辆时，对应车道的RSU天线采用不同的信道与对应车道的OBU单元进行交易。通过本发明的技术方案，有效降低了信道干扰，提升了ETC交易的准确性与稳定性。
The present invention discloses a method and system for reducing adjacent lane interference in an ETC system, the method comprising: using a camera integrated in an RSU antenna of the ETC system to identify vehicle images of the covered current lane and adjacent lanes; when identifying that there is a vehicle in the current lane, turning on the RSU antenna of the current lane to search for a response signal sent by an OBU unit; when there are vehicles in at least two adjacent lanes at the same time, the RSU antenna of the corresponding lane uses the same channel for searching; when the license plate information corresponding to the OBU signal successfully matches the license plate information of the vehicle image collected by the current lane, the RSU antenna of the current lane is traded with the OBU unit; when there are vehicles in at least two adjacent lanes at the same time, the RSU antenna of the corresponding lane uses different channels to trade with the OBU unit of the corresponding lane. Through the technical solution of the present invention, channel interference is effectively reduced, and the accuracy and stability of ETC transactions are improved.
Description
Technical Field
The invention relates to the technical field of traffic control, in particular to a method for reducing adjacent channel interference in an ETC system and a system for reducing adjacent channel interference in the ETC system.
Background
Currently, ETC (Electronic Toll Collection ) is a full-automatic toll collection method for automatically completing deduction of vehicle tolls under the condition that vehicles are not parked through information interaction of RSU (Road Side Unit) and OBU (On Board Unit) by using a special short-range microwave communication technology. The method has the advantages of high passing efficiency, reduction of exhaust emission, reduction of environmental pollution and the like. The existing ETC system mainly comprises the following devices:
(1) The lane controller is responsible for controlling the state of the lane and finishing information processing such as toll calculation and the like;
(2) The RSU (Road Side Unit) comprises an RSU antenna and an RSU controller, and the kernel security access module is used for communicating with the OBU to complete the acquisition of the OBU information and the deduction of the OBU, and transmitting the information to the lane controller. The RSU antenna is generally arranged at a position 4.5 meters above the lane, and a charging lane is covered every RSU;
(3) OBU (On Board Unit) is installed On user vehicle, generally comprises electronic tag and IC user card, the tag is loaded with vehicle information, the IC user card is loaded with user information, the tag is mainly used for communication with RSU, and the operation of reading and writing data of IC user card and deducting fee is completed according to RSU instruction.
In the existing ETC system in a multi-lane environment, because the beam range of the RSU antenna is difficult to accurately control, the signal of the antenna cannot be ensured to only cover the range of the lane, but can not cover a bypass, the sensitivity difference of the OBU is large, the lane environment is complex, and the vehicle and other electromechanical equipment attached to the lane have a reflection effect on microwave signals. For the OBU, signals of multiple RSUs may be received simultaneously, which results in that collision data is lost or data of other channels is received but data of an antenna of the lane is not received, and for the RSU, data of an OBU of a vehicle of the lane may be received, and in addition to data of an OBU of the vehicle of the lane, data of an OBU of a vehicle of an adjacent lane may also be received. The OBU receives adjacent channel antenna data and possibly leads to the normal transaction of the lane to be influenced, the success rate of the transaction is reduced, and the passing efficiency is influenced. The RSU receives the adjacent channel OBU data, and may cause a mistransaction to the adjacent channel OBU, deduct fees from the adjacent channel OBU, and release the vehicle which is not deducted fees from the lane. Adjacent lane interference has become a major problem in affecting the traffic efficiency of ETC toll lanes.
Disclosure of Invention
In order to solve the problems, the invention provides a method and a system for reducing adjacent channel interference in an ETC system, which are characterized in that a camera is integrated in an RSU antenna to identify vehicle license plate information of a current lane and adjacent lanes, an OBU signal consistent with the current lane license plate information of the RSU antenna is transacted, when vehicles exist in a plurality of adjacent lanes at the same time, the same channel is adopted to search for the signal, different channels are adopted to transact, and the image recognition and channel management technology are combined, so that the channel interference is effectively reduced, and the accuracy and the stability of ETC transaction are improved.
In order to achieve the above object, the present invention provides a method for reducing adjacent channel interference in an ETC system, including:
identifying the vehicle images of the covered current lane and the adjacent lane by utilizing a camera integrated in an RSU antenna of the ETC system;
when the fact that the vehicle exists in the current lane is recognized, opening the RSU antenna of the current lane to search for a response signal sent by the OBU unit;
When vehicles exist in at least two adjacent lanes at the same time, the RSU antennas of the corresponding lanes search by adopting the same channel;
When license plate information corresponding to the OBU signal is successfully matched with license plate information of a vehicle image acquired by a current lane, the RSU antenna of the current lane is transacted with the OBU unit;
when vehicles exist in at least two adjacent lanes at the same time, the RSU antennas of the corresponding lanes adopt different channels to conduct transactions with the OBU units of the corresponding lanes.
In the above technical solution, preferably, the method for reducing adjacent channel interference in the ETC system further includes:
and when the fact that the vehicle does not exist in the current lane is identified, the RSU antenna of the current lane is closed, and the OBU searching signal is not transmitted.
In the foregoing technical solution, preferably, the identifying, by using a camera integrated in an RSU antenna of an ETC system, vehicle images of a covered current lane and an adjacent lane includes:
integrating cameras in RSU antennae corresponding to each lane of the ETC system, wherein the cameras can cover the current lane and adjacent lanes for video image acquisition;
And identifying according to the acquired video image to obtain license plate information of the vehicle.
In the above technical solution, preferably, when it is identified that the vehicle exists in the current lane, the specific process of turning on the RSU antenna of the current lane to search for the response signal sent by the OBU unit includes:
And the RSU controller opens an RSU antenna corresponding to the lane with the vehicle to send out an OBU searching signal according to the identification information of each lane so as to search for a response signal sent by the OBU unit.
In the above technical solution, preferably, when the license plate information corresponding to the OBU signal is successfully matched with the license plate information of the vehicle image acquired by the current lane, the specific process includes:
Searching an OBU signal corresponding to license plate information matched with the license plate information of the current lane according to the identification information of the acquired video image;
and if the OBU signal consistent with the license plate information of the current lane is matched, the RSU antenna of the current lane is transacted with the OBU unit corresponding to the OBU signal.
The invention also provides a system for reducing adjacent channel interference in the ETC system, and a method for reducing adjacent channel interference in the ETC system, disclosed by any one of the technical schemes, comprises the following steps:
The vehicle identification module is used for identifying vehicle images of the covered current lane and adjacent lanes by utilizing cameras integrated in RSU antennae of the ETC system;
the signal searching module is used for opening the RSU antenna of the current lane to search a response signal sent by the OBU unit when the vehicle in the current lane is identified;
The RSU antennas of the corresponding lanes are searched by adopting the same channel when vehicles exist in at least two adjacent lanes at the same time;
The matching transaction module is used for carrying out transaction on the RSU antenna of the current lane and the OBU unit when the license plate information corresponding to the OBU signal is successfully matched with the license plate information of the vehicle image acquired by the current lane;
and the RSU antenna of the corresponding lane is used for trading with the OBU units of the corresponding lane by adopting different channels when vehicles exist in at least two adjacent lanes simultaneously.
In the above technical solution, preferably, the system for reducing adjacent channel interference in the ETC system further includes a signal closing module, configured to close an RSU antenna of the current lane and no longer transmit the OBU search signal when it is identified that the current lane does not have a vehicle.
In the foregoing technical solution, preferably, the vehicle identification module is specifically configured to:
integrating cameras in RSU antennae corresponding to each lane of the ETC system, wherein the cameras can cover the current lane and adjacent lanes for video image acquisition;
And identifying according to the acquired video image to obtain license plate information of the vehicle.
In the above technical solution, preferably, the signal search module is specifically configured to:
And the RSU controller opens an RSU antenna corresponding to the lane with the vehicle to send out an OBU searching signal according to the identification information of each lane so as to search for a response signal sent by the OBU unit.
In the above technical solution, preferably, the matching transaction module is specifically configured to:
Searching an OBU signal corresponding to license plate information matched with the license plate information of the current lane according to the identification information of the acquired video image;
and if the OBU signal consistent with the license plate information of the current lane is matched, the RSU antenna of the current lane is transacted with the OBU unit corresponding to the OBU signal.
Compared with the prior art, the method has the beneficial effects that the vehicle license plate information of the current lane and the adjacent lanes is identified by integrating the camera in the RSU antenna, the OBU signal consistent with the vehicle license plate information of the current lane is transacted by the RSU antenna, when vehicles exist in a plurality of adjacent lanes at the same time, the signal search is carried out by adopting the same channel, the transaction is carried out by adopting different channels, and the channel interference is effectively reduced by combining the image identification technology and the channel management technology, so that the accuracy and the stability of ETC transaction are improved.
Drawings
FIG. 1 is a schematic diagram of a method for reducing adjacent channel interference in an ETC system according to an embodiment of the present invention;
fig. 2 is a schematic workflow diagram of a method for reducing adjacent channel interference in an ETC system according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention is described in further detail below with reference to the attached drawing figures:
As shown in fig. 1 and fig. 2, the method for reducing adjacent channel interference in an ETC system according to the present invention includes:
identifying the vehicle images of the covered current lane and the adjacent lane by utilizing a camera integrated in an RSU antenna of the ETC system;
when the fact that the vehicle exists in the current lane is recognized, an RSU antenna of the current lane is opened to search a response signal sent by the OBU unit;
when vehicles exist in at least two adjacent lanes at the same time, the RSU antennas of the corresponding lanes search by adopting the same channel;
when license plate information corresponding to the OBU signal is successfully matched with license plate information of the vehicle image acquired by the current lane, carrying out transaction on an RSU antenna of the current lane and the OBU unit;
When vehicles exist in at least two adjacent lanes at the same time, the RSU antennas of the corresponding lanes adopt different channels to conduct transactions with the OBU units of the corresponding lanes.
In the embodiment, the vehicle license plate information of the current lane and the adjacent lanes is identified by integrating the cameras in the RSU antenna, the OBU signals consistent with the vehicle license plate information of the current lane are transacted by the RSU antenna, when vehicles exist in a plurality of adjacent lanes at the same time, the same channels are adopted for signal searching, different channels are adopted for transacting, and the channel interference is effectively reduced and the accuracy and the stability of ETC transaction are improved by combining the image identification technology and the channel management technology.
Specifically, wide-angle high-definition cameras are integrated in the antenna unit, vehicles and license plate numbers in the current lane and the left and right adjacent lanes are identified in real time, and identification results are transmitted to the RSU controller. The OBU license plate number is searched to be matched with the video license plate number, and transaction is started when the OBU license plate number is matched with the video identification license plate number. And if the license plate number is matched with the adjacent channel license plate number identified by the video, the received adjacent channel OBU response signal can be ignored, and the error transaction to the adjacent channel OBU is avoided.
Each lane is provided with an RSU antenna unit, a high-definition camera is integrated in the antenna unit, and the camera is provided with a wide-angle lens and can cover the effective transaction areas of the current lane and the left and right adjacent lanes. The high-definition camera has real-time image processing and license plate recognition functions and is responsible for image acquisition and license plate number recognition of vehicles entering a lane.
The RSU (road side unit) controller is responsible for managing the switch control of the antenna, the transaction control of the OBU and the channel management. The RSU controller receives the vehicle image and license plate number from the antenna unit and performs matching and channel allocation of the OBU transaction based on the information.
The channel management module is used for configuring mutually staggered channels for the multi-lane antennas in advance and avoiding signal collision of adjacent-lane antennas when the multi-lane antennas are simultaneously traded. The adjacent lane antenna units conduct transactions through different channels, and adjacent lane interference is guaranteed to be minimized. The data processing unit is used for analyzing the matching condition of the license plate number and the OBU license plate, deciding whether to conduct the transaction or not and ensuring that the transaction only occurs under the condition of successful matching.
When a vehicle enters a certain lane, a camera in the RSU antenna unit starts to monitor in real time, and image acquisition and license plate number recognition are carried out on the vehicle in the lane. The recognition range includes not only the current lane but also the effective transaction area of the left and right adjacent lanes. After the high-definition camera identifies the license plate number of the vehicle, the information is transmitted to the RSU controller through the antenna unit. The RSU controller stores the license plate numbers of all identified vehicles in the current lane and adjacent lanes.
Further, whether the vehicle exists in the current lane or not is detected through the video image, whether the antenna transmits a signal or not is controlled, when the current lane does not exist, the antenna is closed, the signal is not transmitted, the influence on the normal vehicle passing transaction of the adjacent lane can be reduced, the signal is not transmitted when the adjacent lane does not exist, and the influence on the normal transaction of the current lane can be reduced. When only one vehicle passes through a plurality of adjacent lanes at the same time, the interference of the adjacent lanes can be reduced to the minimum, and the problem of adjacent lane interference is basically avoided. And when the video recognizes that the vehicle enters the current lane, opening the RSU antenna to search the OBU unit, and continuing to close the RSU antenna after the video is completed. When the RSU controller confirms that the vehicle enters the current lane, the antenna unit is controlled to transmit an OBU searching signal and wait for a response signal of the OBU. At this time, if no vehicle enters the adjacent channel, the antenna will not transmit any signal, thus avoiding interference.
In the foregoing embodiment, preferably, the method for reducing adjacent channel interference in the ETC system further includes:
and when the fact that the vehicle does not exist in the current lane is identified, the RSU antenna of the current lane is closed, and the OBU searching signal is not transmitted.
In the above embodiment, preferably, the method for identifying the vehicle image of the covered current lane and the adjacent lane by using the camera integrated in the RSU antenna of the ETC system includes:
integrating cameras in RSU antennae corresponding to each lane of the ETC system, wherein the cameras can cover the current lane and adjacent lanes for video image acquisition;
And identifying according to the acquired video image to obtain license plate information of the vehicle.
In the foregoing embodiment, preferably, when it is recognized that the vehicle exists in the current lane, the specific process of turning on the RSU antenna of the current lane to search for the response signal sent by the OBU unit includes:
And the RSU controller opens an RSU antenna corresponding to the lane with the vehicle to send out an OBU searching signal according to the identification information of each lane so as to search for a response signal sent by the OBU unit.
In the foregoing embodiment, preferably, when the license plate information corresponding to the OBU signal is successfully matched with the license plate information of the vehicle image acquired by the current lane, the transaction is performed between the RSU antenna of the current lane and the OBU unit, and the specific process includes:
Searching an OBU signal corresponding to license plate information matched with the license plate information of the current lane according to the identification information of the acquired video image;
and if the OBU signal consistent with the license plate information of the current lane is matched, the RSU antenna of the current lane is transacted with the OBU unit corresponding to the OBU signal.
Specifically, if a response signal of an adjacent channel OBU is received, the RSU controller matches the license plate number of the OBU according to the license plate number identified by the adjacent channel camera. If the answer signal is sent by the adjacent road vehicle, the system ignores the answer signal and prevents interference. When vehicles in a plurality of lanes enter and start trading simultaneously, the antennas of all the lanes are started, and OBU trading is carried out through a preset channel. At this time, the RSU controller of each lane determines which OBU to trade with through the matching result of the license plate number of the camera recognition and the OBU license plate number, and ensures that even if the adjacent lane OBU signal enters the current lane antenna, the transaction flow is not interfered. When the camera detects that no vehicle exists in the lane, the RSU controller closes the antenna of the lane, no OBU searching signal is transmitted any more, and unnecessary interference to adjacent lanes is avoided. Even if vehicles enter adjacent roads, the antennas of the adjacent roads can work independently, and the operation of the current lane is not affected.
According to the method for reducing adjacent channel interference in the ETC system disclosed by the embodiment, in the implementation process, when a plurality of lanes pass through simultaneously, a plurality of RSU antennas are used for searching by broadcasting in the OBU searching stage, the same channel is used for searching, the OBU receives the searching signals of the RSU antenna of the current lane or the RSU antenna of the adjacent lane, the RSU antenna is responded by the same channel for searching, the RSU antenna of the current lane can receive the response of the corresponding lane OBU unit, and the searching success rate is ensured.
After the OBU unit is searched, unique identity information (MAC) of the OBU unit is obtained, when the OBU unit is subjected to independent communication deduction operation, different lane intervals are used for communicating the OBU unit of the lane, different channels are staggered, adjacent lane antennas are used for communicating the OBU unit by using electromagnetic waves of different frequency bands, the problem that signal coverage is overlapped to interfere with each other does not exist, and the problem that the time consumption of transaction is increased because of waiting for a transmitting window by synchronously staggering communication time does not exist. The vehicle transaction is completed and the vehicle passes through the toll lane.
If the video identification detects that no vehicle exists in the current lane, the RSU antenna is closed, an OBU searching signal is not transmitted, if the video identification detects that a rear vehicle enters the current lane, the OBU searching signal is continuously transmitted until an OBU unit matched with the vehicle license plate information of the video identification current lane is searched, a channel staggered from adjacent lanes is fixedly configured for the OBU unit, communication transaction fee deduction is completed for the OBU, and the steps are repeated.
The adjacent lane antennae are configured to use different channels, so that each lane is ensured not to collide with the signals of the adjacent lanes when carrying out transactions. Particularly, when multiple lanes trade simultaneously, the adjacent channels are staggered, so that mutual interference of signals is effectively avoided.
In short, the RSU antennas of a plurality of adjacent lanes adopt the same channel in the OBU searching process, and adopt different channels in the OBU transaction process, so that the mutual interference of communication frequency band signals is avoided.
According to the method for reducing adjacent channel interference in the ETC system disclosed in the above embodiment, in the implementation process, specifically, in a certain ETC multilane system, it is assumed that three lanes of lane 1, lane 2 and lane 3 are respectively configured with the system of the present invention:
Vehicle a enters lane 1, vehicle B enters lane 2, and lane 3 has no vehicle, lane 1 presets transaction use channel 1, lane 2 presets transaction use channel 2, lane 3 presets transaction use channel 1, and unified use channel 1 is searched.
The camera of the lane 1 respectively recognizes the vehicle A and the license plate number of the lane 1, and the vehicle B and the license plate number of the lane 2, and transmits the vehicle A and the license plate number to the RSU controller.
The RSU controller of the lane 1 transmits an OBU searching signal according to the information of the vehicle A, and confirms the transaction by matching the OBU license plate number.
The RSU controller of lane 2 also controls the antenna to transmit signals, but lane 3 has no vehicle, the antenna is in the off state, and no signal is transmitted.
If the antenna of the lane 1 receives the OBU response signal from the vehicle B of the lane 2, the RSU controller of the lane 1 recognizes the license plate number through the camera, confirms that the response signal does not belong to the vehicle of the lane 1, and automatically ignores the response signal.
Lane 1 uses channel 1 to trade vehicle a and lane 2 uses channel 2 to trade vehicle B, the trade is done simultaneously without interfering with each other.
When a vehicle enters the lane 3, the antenna of the lane 3 is started, the lane 3 uses the channel 1 to trade the vehicle entering the lane 3, and the lane 2 uses the channel 2, so that the frequency band errors cannot be influenced mutually.
The invention also provides a system for reducing adjacent channel interference in the ETC system, and the method for reducing the adjacent channel interference in the ETC system, disclosed by any one of the embodiments, comprises the following steps:
The vehicle identification module is used for identifying vehicle images of the covered current lane and adjacent lanes by utilizing cameras integrated in RSU antennae of the ETC system;
the signal searching module is used for opening an RSU antenna of the current lane to search a response signal sent by the OBU unit when the fact that the vehicle exists in the current lane is recognized;
The RSU antennas are used for searching by adopting the same channel when vehicles exist in at least two adjacent lanes simultaneously;
The matching transaction module is used for carrying out transaction on the RSU antenna of the current lane and the OBU unit when the license plate information corresponding to the OBU signal is successfully matched with the license plate information of the vehicle image acquired by the current lane;
And the RSU antennas of the corresponding lanes are used for trading with the OBU units of the corresponding lanes by adopting different channels when vehicles exist in at least two adjacent lanes simultaneously.
In the foregoing embodiment, preferably, the system for reducing adjacent channel interference in the ETC system further includes a signal closing module, configured to close an RSU antenna of the current lane and no longer transmit the OBU search signal when it is identified that the current lane does not have a vehicle.
In the above embodiment, preferably, the vehicle identification module is specifically configured to:
integrating cameras in RSU antennae corresponding to each lane of the ETC system, wherein the cameras can cover the current lane and adjacent lanes for video image acquisition;
And identifying according to the acquired video image to obtain license plate information of the vehicle.
In the above embodiment, preferably, the signal search module is specifically configured to:
And the RSU controller opens an RSU antenna corresponding to the lane with the vehicle to send out an OBU searching signal according to the identification information of each lane so as to search for a response signal sent by the OBU unit.
In the above embodiment, preferably, the matching transaction module is specifically configured to:
Searching an OBU signal corresponding to license plate information matched with the license plate information of the current lane according to the identification information of the acquired video image;
and if the OBU signal consistent with the license plate information of the current lane is matched, the RSU antenna of the current lane is transacted with the OBU unit corresponding to the OBU signal.
According to the system for reducing adjacent channel interference in the ETC system disclosed in the above embodiment, functions to be realized by each module are respectively corresponding and consistent with each step of the method for reducing adjacent channel interference in the ETC system disclosed in the above embodiment, and in the implementation process, operations are performed with reference to the above embodiment, which is not described herein.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for reducing adjacent channel interference in an ETC system, comprising:
identifying the vehicle images of the covered current lane and the adjacent lane by utilizing a camera integrated in an RSU antenna of the ETC system;
when the fact that the vehicle exists in the current lane is recognized, opening the RSU antenna of the current lane to search for a response signal sent by the OBU unit;
When vehicles exist in at least two adjacent lanes at the same time, the RSU antennas of the corresponding lanes search by adopting the same channel;
When license plate information corresponding to the OBU signal is successfully matched with license plate information of a vehicle image acquired by a current lane, the RSU antenna of the current lane is transacted with the OBU unit;
when vehicles exist in at least two adjacent lanes at the same time, the RSU antennas of the corresponding lanes adopt different channels to conduct transactions with the OBU units of the corresponding lanes.
2. The method for reducing adjacent channel interference in an ETC system of claim 1, further comprising:
and when the fact that the vehicle does not exist in the current lane is identified, the RSU antenna of the current lane is closed, and the OBU searching signal is not transmitted.
3. The method for reducing adjacent channel interference in an ETC system according to claim 1 or 2, wherein the identifying the vehicle image of the covered current lane and the adjacent lane by using the camera integrated in the RSU antenna of the ETC system comprises the following specific steps:
integrating cameras in RSU antennae corresponding to each lane of the ETC system, wherein the cameras can cover the current lane and adjacent lanes for video image acquisition;
And identifying according to the acquired video image to obtain license plate information of the vehicle.
4. The method for reducing adjacent channel interference in an ETC system according to claim 3, wherein the specific process of turning on the RSU antenna of the current lane to search for a response signal sent by the OBU unit when the presence of the vehicle in the current lane is recognized comprises:
And the RSU controller opens an RSU antenna corresponding to the lane with the vehicle to send out an OBU searching signal according to the identification information of each lane so as to search for a response signal sent by the OBU unit.
5. The method for reducing adjacent channel interference in an ETC system according to claim 3, wherein when the license plate information corresponding to the OBU signal is successfully matched with the license plate information of the vehicle image collected by the current lane, the method comprises the following specific steps:
Searching an OBU signal corresponding to license plate information matched with the license plate information of the current lane according to the identification information of the acquired video image;
and if the OBU signal consistent with the license plate information of the current lane is matched, the RSU antenna of the current lane is transacted with the OBU unit corresponding to the OBU signal.
6. A system for reducing adjacent channel interference in an ETC system, characterized in that a method for reducing adjacent channel interference in an ETC system as claimed in any of the claims 1 to 5 is applied, comprising:
The vehicle identification module is used for identifying vehicle images of the covered current lane and adjacent lanes by utilizing cameras integrated in RSU antennae of the ETC system;
the signal searching module is used for opening the RSU antenna of the current lane to search a response signal sent by the OBU unit when the vehicle in the current lane is identified;
The RSU antennas of the corresponding lanes are searched by adopting the same channel when vehicles exist in at least two adjacent lanes at the same time;
The matching transaction module is used for carrying out transaction on the RSU antenna of the current lane and the OBU unit when the license plate information corresponding to the OBU signal is successfully matched with the license plate information of the vehicle image acquired by the current lane;
and the RSU antenna of the corresponding lane is used for trading with the OBU units of the corresponding lane by adopting different channels when vehicles exist in at least two adjacent lanes simultaneously.
7. The system for reducing adjacent channel interference in an ETC system of claim 6, further comprising a signal shutdown module for shutting down an RSU antenna of a current lane and not transmitting an OBU search signal when it is recognized that no vehicle is present in the current lane.
8. The system for reducing adjacent channel interference in an ETC system according to claim 6 or 7, wherein the vehicle identification module is specifically configured to:
integrating cameras in RSU antennae corresponding to each lane of the ETC system, wherein the cameras can cover the current lane and adjacent lanes for video image acquisition;
And identifying according to the acquired video image to obtain license plate information of the vehicle.
9. The system for reducing adjacent channel interference in an ETC system of claim 8, wherein the signal search module is specifically configured to:
And the RSU controller opens an RSU antenna corresponding to the lane with the vehicle to send out an OBU searching signal according to the identification information of each lane so as to search for a response signal sent by the OBU unit.
10. The system for reducing adjacent channel interference in an ETC system of claim 8, wherein the matching transaction module is specifically configured to:
Searching an OBU signal corresponding to license plate information matched with the license plate information of the current lane according to the identification information of the acquired video image;
and if the OBU signal consistent with the license plate information of the current lane is matched, the RSU antenna of the current lane is transacted with the OBU unit corresponding to the OBU signal.
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