Method and system for reducing adjacent channel interference in ETC system

Abstract

The invention discloses a method and a system for reducing adjacent lane interference in an ETC (Electronic Toll Collection) system. The method comprises the following steps of: identifying vehicle images of a covered current lane and an adjacent lane by using a camera integrated in an RSU antenna of the ETC system; when it is recognized that the vehicle exists in the current lane, an RSU antenna of the current lane is turned on to search for a response signal sent by an OBU; when vehicles exist in at least two adjacent lanes at the same time, the RSU antennas of the corresponding lanes adopt the same channel for searching; 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 RSU antenna of the current lane transacts with the OBU unit; and when the vehicles exist in at least two adjacent lanes at the same time, the RSU antennas of the corresponding lanes adopt different channels to carry out transactions with the OBU units of the corresponding lanes. Through the technical scheme of the invention, the channel interference is effectively reduced, and the accuracy and stability of ETC transaction are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of traffic control, and in particular to a method for reducing adjacent lane interference in an ETC system and a system for reducing adjacent lane interference in an ETC system. Background Art

[0002] At present, ETC (Electronic Toll Collection) is a fully automatic toll collection method that uses dedicated short-range microwave communication technology to automatically complete the deduction of vehicle tolls without stopping the vehicle through information interaction between RSU (Road Side Unit) and OBU (On Board Unit). It has the advantages of high traffic efficiency, reduced exhaust emissions and reduced environmental pollution. The existing ETC system mainly includes the following equipment:

[0003] (1) Lane controller: responsible for controlling lane status and completing information processing such as toll calculation;

[0004] (2) RSU (Road Side Unit): It consists of RSU antenna and RSU controller, kernel security access module, communicates with OBU, completes OBU information collection and OBU fee deduction, and transmits information to lane controller. RSU antenna is generally installed 4.5 meters above the lane, and each RSU covers a toll lane;

[0005] (3) OBU (On Board Unit): OBU is installed on the user's vehicle and is generally composed of an electronic tag and an IC user card. The tag is loaded with vehicle information, and the IC user card is loaded with user information. The tag is mainly used to communicate with the RSU and complete the reading and writing of IC user card data and deduction operations according to the RSU instructions.

[0006] In the existing ETC system in a multi-lane environment, it is often impossible to ensure that the antenna signal only covers the range of the lane and does not cover the side lanes because the beam range of the RSU antenna is difficult to control accurately. In addition, the OBU sensitivity varies greatly, and the lane environment is complex. The vehicle itself and other electromechanical equipment attached to the lane reflect the microwave signal. For the OBU, it can often receive signals from multiple RSUs at the same time, resulting in the loss of conflicting data or receiving data from other lanes without receiving data from the antenna of the lane. For the RSU, in addition to receiving data from the OBU of the vehicle in the lane, it is possible to receive data from the OBU of the vehicle in the adjacent lane. The OBU receiving data from the adjacent lane antenna may affect the normal transaction of the lane, reduce the transaction success rate, and affect the traffic efficiency. When the RSU receives data from the OBU of the adjacent lane, it may cause the transaction to be mistakenly made to the OBU of the adjacent lane, and the OBU of the adjacent lane will be charged, while the vehicle in the lane without being charged will be released. Adjacent lane interference has become a major problem affecting the traffic efficiency of ETC toll lanes. Summary of the invention

[0007] In view of the above problems, the present invention provides a method and system for reducing adjacent lane interference in the ETC system, by integrating a camera in the RSU antenna to identify the vehicle license plate information of the current lane and the adjacent lane, and trading the OBU signal with the consistent license plate information of the RSU antenna and the current lane, and when there are vehicles in multiple adjacent lanes at the same time, the same channel is used for signal search and different channels are used for transactions. By combining image recognition and channel management technology, channel interference is effectively reduced and the accuracy and stability of ETC transactions are improved.

[0008] To achieve the above object, the present invention provides a method for reducing adjacent channel interference in an ETC system, comprising:

[0009] The camera integrated in the RSU antenna of the ETC system is used to identify the vehicle images of the current lane and adjacent lanes covered;

[0010] When a vehicle is identified in the current lane, the RSU antenna of the current lane is turned on to search for a response signal sent by the OBU unit;

[0011] When there are vehicles in at least two adjacent lanes at the same time, the RSU antennas of the corresponding lanes use the same channel for searching;

[0012] 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;

[0013] When there are vehicles in at least two adjacent lanes at the same time, the RSU antennas of the corresponding lanes use different channels to perform transactions with the OBU units of the corresponding lanes.

[0014] In the above technical solution, preferably, the method for reducing adjacent channel interference in the ETC system also includes:

[0015] When it is recognized that there is no vehicle in the current lane, the RSU antenna of the current lane is turned off and the OBU search signal is no longer transmitted.

[0016] In the above technical solution, preferably, the camera integrated in the RSU antenna of the ETC system is used to identify the vehicle images of the covered current lane and adjacent lanes, and the specific process includes:

[0017] A camera is integrated into the RSU antenna corresponding to each lane of the ETC system, and the camera can cover the current lane and adjacent lanes for video image acquisition;

[0018] The vehicle license plate information is obtained by performing recognition based on the collected video images.

[0019] In the above technical solution, preferably, when a vehicle is identified in the current lane, the RSU antenna of the current lane is turned on to search for a response signal sent by the OBU unit, and the specific process includes:

[0020] According to the identification information of each lane, the RSU controller turns on the RSU antenna corresponding to the lane where the vehicle exists and sends out an OBU search signal to search for the response signal sent by the OBU unit.

[0021] In the above technical solution, preferably, 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, and the specific process includes:

[0022] According to the recognition information of the collected video image, the OBU signal corresponding to the license plate information that matches the license plate information of the current lane is searched;

[0023] If an OBU signal that is consistent with the license plate information of the current lane is matched, the RSU antenna of the current lane is traded with the OBU unit corresponding to the OBU signal.

[0024] The present invention further proposes a system for reducing adjacent channel interference in an ETC system, which uses the method for reducing adjacent channel interference in an ETC system disclosed in any one of the above technical solutions, including:

[0025] A vehicle identification module is used to identify vehicle images of the current lane and adjacent lanes covered by the camera integrated in the RSU antenna of the ETC system;

[0026] A signal search module is used to turn on the RSU antenna of the current lane to search for a response signal sent by the OBU unit when a vehicle is identified in the current lane;

[0027] It is also used for when there are vehicles in at least two adjacent lanes at the same time, the RSU antennas of the corresponding lanes use the same channel to search;

[0028] A matching transaction module is used to trade the RSU antenna of the current lane with the OBU unit when the license plate information corresponding to the OBU signal matches the license plate information of the vehicle image collected by the current lane successfully;

[0029] It is also used for when there are vehicles in at least two adjacent lanes at the same time, the RSU antennas of the corresponding lanes use different channels to trade with the OBU units of the corresponding lanes.

[0030] In the above technical solution, preferably, the system for reducing adjacent lane interference in the ETC system also includes a signal shutoff module, which is used to shut down the RSU antenna of the current lane and no longer transmit the OBU search signal when it is identified that there is no vehicle in the current lane.

[0031] In the above technical solution, preferably, the vehicle identification module is specifically used for:

[0032] A camera is integrated into the RSU antenna corresponding to each lane of the ETC system, and the camera can cover the current lane and adjacent lanes for video image acquisition;

[0033] The vehicle license plate information is obtained by performing recognition based on the collected video images.

[0034] In the above technical solution, preferably, the signal search module is specifically used for:

[0035] According to the identification information of each lane, the RSU controller turns on the RSU antenna corresponding to the lane where the vehicle exists and sends out an OBU search signal to search for the response signal sent by the OBU unit.

[0036] In the above technical solution, preferably, the matching transaction module is specifically used for:

[0037] According to the recognition information of the collected video image, the OBU signal corresponding to the license plate information that matches the license plate information of the current lane is searched;

[0038] If an OBU signal that is consistent with the license plate information of the current lane is matched, the RSU antenna of the current lane is traded with the OBU unit corresponding to the OBU signal.

[0039] Compared with the prior art, the beneficial effects of the present invention are as follows: by integrating a camera in the RSU antenna to identify the vehicle license plate information of the current lane and the adjacent lane, the OBU signal with the consistent license plate information of the RSU antenna and the current lane is traded, and when there are vehicles in multiple adjacent lanes at the same time, the same channel is used for signal search and different channels are used for transactions. By combining image recognition with channel management technology, channel interference is effectively reduced and the accuracy and stability of ETC transactions are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of the architecture of a method for reducing adjacent channel interference in an ETC system disclosed in an embodiment of the present invention;

[0041] Figure 2 A schematic diagram of the working process of a method for reducing adjacent channel interference in an ETC system disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0044] like Figure 1 and Figure 2 As shown, a method for reducing adjacent channel interference in an ETC system provided by the present invention includes:

[0045] The camera integrated in the RSU antenna of the ETC system is used to identify the vehicle images of the current lane and adjacent lanes covered;

[0046] When a vehicle is identified in the current lane, the RSU antenna of the current lane is turned on to search for the response signal sent by the OBU unit;

[0047] When there are vehicles in at least two adjacent lanes at the same time, the RSU antennas of the corresponding lanes use the same channel for searching;

[0048] When the license plate information corresponding to the OBU signal successfully matches the license plate information of the vehicle image collected in the current lane, the RSU antenna of the current lane is traded with the OBU unit;

[0049] When there are vehicles in at least two adjacent lanes at the same time, the RSU antennas of the corresponding lanes use different channels to communicate with the OBU units of the corresponding lanes.

[0050] In this implementation, a camera is integrated into the RSU antenna to identify the vehicle license plate information of the current lane and the adjacent lane, and the OBU signal with consistent license plate information between the RSU antenna and the current lane is traded. When there are vehicles in multiple adjacent lanes at the same time, the same channel is used for signal search and different channels are used for transactions. By combining image recognition with channel management technology, channel interference is effectively reduced and the accuracy and stability of ETC transactions are improved.

[0051] Specifically, a wide-angle high-definition camera is integrated in the antenna unit to identify vehicles and license plate numbers in the current lane and the two adjacent lanes on the left and right in real time, and transmit the identification results to the RSU controller. The OBU license plate number is searched to match the video license plate number, and the transaction starts when the OBU license plate number matches the video recognition license plate number. For the adjacent lane OBU response signal received, if the license plate number matches the adjacent lane license plate number identified by the video, the response signal can be ignored to avoid mistaken transactions to the adjacent lane OBU.

[0052] Each lane is equipped with an RSU antenna unit, which integrates a high-definition camera with a wide-angle lens, which can cover the effective transaction area of ​​the current lane and the two adjacent lanes on the left and right. 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 the lane.

[0053] Among them, the RSU (Roadside 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 matches the OBU transaction and allocates channels based on this information.

[0054] The channel management module pre-configures mutually staggered channels for multiple lane antennas to avoid signal conflicts between adjacent lane antennas when multiple lanes are trading simultaneously. Adjacent lane antenna units trade through different channels to minimize interference with adjacent lanes. The data processing unit is used to analyze the matching of the license plate number and the OBU license plate, decide whether to trade, and ensure that the transaction only occurs when the match is successful.

[0055] When a vehicle enters a lane, the camera in the RSU antenna unit starts real-time monitoring and performs image acquisition and license plate number recognition on the vehicles in the lane. The recognition range not only includes the current lane, but also extends to the effective transaction areas of the left and right adjacent lanes. After the high-definition camera recognizes the vehicle's license plate number, it transmits the information to the RSU controller through the antenna unit. The RSU controller stores the license plate numbers of all recognized vehicles in the current lane and adjacent lanes.

[0056] Furthermore, by detecting whether there is a car in the current lane through video images, the antenna is controlled to transmit a signal. When there is no car in the current lane, the antenna is turned off and no signal is transmitted, which can reduce the impact on the normal passing transactions of adjacent lanes. Similarly, when there is no car in the adjacent lane, no signal is transmitted, which can reduce the impact on the normal transactions of the current lane. When there is only one car passing through multiple adjacent lanes at the same time, the interference of adjacent lanes can be minimized, and there is basically no interference problem with adjacent lanes. When the video recognizes that a car has entered the current lane, the RSU antenna is turned on to search for the OBU unit for transactions, and the RSU antenna is turned off after completion. When the RSU controller confirms that a vehicle has entered the current lane, it controls the antenna unit to transmit an OBU search signal and waits for the OBU's response signal. At this time, if there is no vehicle entering the adjacent lane, its antenna will not transmit any signal to avoid interference.

[0057] In the above implementation, preferably, the method for reducing adjacent channel interference in the ETC system further includes:

[0058] When it is recognized that there is no vehicle in the current lane, the RSU antenna of the current lane is turned off and the OBU search signal is no longer transmitted.

[0059] In the above implementation, preferably, the camera integrated in the RSU antenna of the ETC system is used to identify the vehicle images of the covered current lane and adjacent lanes, and the specific process includes:

[0060] A camera is integrated into the RSU antenna corresponding to each lane of the ETC system, and the camera can cover the current lane and adjacent lanes for video image acquisition;

[0061] The vehicle license plate information is obtained by performing recognition based on the collected video images.

[0062] In the above implementation, preferably, when a vehicle is identified in the current lane, the RSU antenna of the current lane is turned on to search for a response signal sent by the OBU unit, and the specific process includes:

[0063] According to the identification information of each lane, the RSU controller turns on the RSU antenna corresponding to the lane where the vehicle exists and sends out an OBU search signal to search for the response signal sent by the OBU unit.

[0064] In the above implementation, preferably, 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, and the specific process includes:

[0065] According to the recognition information of the collected video image, the OBU signal corresponding to the license plate information that matches the license plate information of the current lane is searched;

[0066] If an OBU signal that is consistent with the license plate information of the current lane is matched, the RSU antenna of the current lane is traded with the OBU unit corresponding to the OBU signal.

[0067] Specifically, if a response signal is received from the adjacent lane OBU, the RSU controller will match the license plate number of the OBU based on the license plate number identified by the adjacent lane camera. If the response signal is sent by a vehicle in the adjacent lane, the system will ignore the response signal to prevent interference. When vehicles in multiple lanes enter at the same time and start trading, the antennas of each lane will be turned on and the OBU transaction will be conducted through the preset channel. At this time, the RSU controller of each lane determines which OBU to trade with by identifying the matching result of the license plate number and the OBU license plate number through the camera, ensuring that even if the adjacent lane OBU signal enters the antenna of the current lane, it will not interfere with the transaction process. When the camera detects that there is no vehicle in the lane, the RSU controller will turn off the antenna of the lane and no longer transmit any OBU search signal to avoid unnecessary interference to the adjacent lane. Even if a vehicle enters the adjacent lane, the adjacent lane antenna will work independently without affecting the operation of the current lane.

[0068] According to the method for reducing adjacent lane interference in the ETC system disclosed in the above-mentioned implementation mode, during the implementation process, when vehicles pass through multiple lanes at the same time, multiple RSU antennas broadcast and search for OBUs in the same channel. Regardless of whether the OBU receives a search signal from the RSU antenna of the current lane or the RSU antenna of the adjacent lane, it responds to the RSU antenna search using the same channel. The RSU antenna of the current lane can receive a response from the OBU unit of the corresponding lane, and the search success rate is guaranteed.

[0069] After searching for the OBU unit, the unique identity information MAC of the OBU unit is obtained. When performing a separate communication and fee deduction operation on the OBU unit, different lane intervals use different channels to communicate with the OBU unit of their own lanes. The channels are staggered, and the antennas of adjacent lanes use electromagnetic waves of different frequency bands to communicate with the OBU unit. There is no problem of overlapping signal coverage and interference between them, and there is no problem of increasing transaction time by waiting for the transmission window due to synchronous staggered communication time. The vehicle transaction is completed and the vehicle passes through the toll lane.

[0070] If the video recognition detects that there is no vehicle in the current lane, the RSU antenna is turned off and the OBU search signal is not transmitted. If the video recognition detects that the rear vehicle enters the current lane, the OBU search signal continues to be transmitted until an OBU unit that matches the license plate information of the vehicle in the current lane identified by the video is found. The OBU unit is then charged for the communication transaction using a fixed channel staggered in adjacent lanes, and this process is repeated.

[0071] Adjacent lane antennas are configured to use different channels to ensure that each lane will not conflict with the signals of adjacent lanes when conducting transactions. Especially when multiple lanes are trading at the same time, the adjacent channels are staggered to effectively avoid mutual interference of signals.

[0072] Simply put, the RSU antennas of multiple adjacent lanes use the same channel during the OBU search process and different channels during the OBU transaction process to avoid mutual interference of communication frequency band signals.

[0073] According to the method for reducing adjacent lane interference in the ETC system disclosed in the above embodiment, during the implementation process, specifically, in a certain ETC multi-lane system, assuming that lane 1, lane 2 and lane 3 are respectively configured with the system of the present invention:

[0074] Vehicle A enters lane 1, vehicle B enters lane 2, and there is no car in lane 3. Lane 1 is preset to use channel 1 for transactions, lane 2 is preset to use channel 2 for transactions, and lane 3 is preset to use channel 1 for transactions. The search is unified to use channel 1.

[0075] The camera in lane 1 identifies vehicle A and its license plate number in lane 1, and vehicle B and its license plate number in lane 2, and transmits them to the RSU controller.

[0076] The RSU controller of lane 1 transmits an OBU search signal based on the information of vehicle A and confirms the transaction by matching the OBU license plate number.

[0077] The RSU controller in lane 2 also controls the antenna to transmit signals, but there is no car in lane 3, the antenna is in the off state and does not transmit any signals.

[0078] If the antenna of lane 1 receives an OBU response signal from vehicle B in lane 2 at this time, the RSU controller of lane 1 will recognize the license plate number through the camera, confirm that the response signal does not belong to the vehicle in lane 1, and automatically ignore the signal.

[0079] Lane 1 uses channel 1 to trade with vehicle A, and lane 2 uses channel 2 to trade with vehicle B. The transactions are carried out simultaneously without interfering with each other.

[0080] When a vehicle enters lane 3, the antenna of lane 3 will be turned on. Lane 3 uses channel 1 to communicate with the vehicle entering lane 3, and lane 2 uses channel 2. Frequency band errors will not affect each other.

[0081] The present invention further proposes a system for reducing adjacent channel interference in an ETC system, which uses the method for reducing adjacent channel interference in an ETC system disclosed in any one of the above embodiments, including:

[0082] A vehicle identification module is used to identify vehicle images of the current lane and adjacent lanes covered by the camera integrated in the RSU antenna of the ETC system;

[0083] The signal search module is used to turn on the RSU antenna of the current lane to search for the response signal sent by the OBU unit when a vehicle is identified in the current lane;

[0084] It is also used for when there are vehicles in at least two adjacent lanes at the same time, the RSU antennas of the corresponding lanes use the same channel for searching;

[0085] The matching transaction module is used to trade the RSU antenna of the current lane with the OBU unit when the license plate information corresponding to the OBU signal matches the license plate information of the vehicle image collected by the current lane successfully;

[0086] It is also used for when there are vehicles in at least two adjacent lanes at the same time, the RSU antennas of the corresponding lanes use different channels to trade with the OBU units of the corresponding lanes.

[0087] In the above embodiment, preferably, the system for reducing adjacent lane interference in the ETC system also includes a signal shutoff module, which is used to shut down the RSU antenna of the current lane and no longer transmit the OBU search signal when it is identified that there is no vehicle in the current lane.

[0088] In the above implementation, preferably, the vehicle identification module is specifically used for:

[0089] A camera is integrated into the RSU antenna corresponding to each lane of the ETC system, and the camera can cover the current lane and adjacent lanes for video image acquisition;

[0090] The vehicle license plate information is obtained by performing recognition based on the collected video images.

[0091] In the above implementation, preferably, the signal search module is specifically used for:

[0092] According to the identification information of each lane, the RSU controller turns on the RSU antenna corresponding to the lane where the vehicle exists and sends out an OBU search signal to search for the response signal sent by the OBU unit.

[0093] In the above implementation, preferably, the matching transaction module is specifically used for:

[0094] According to the recognition information of the collected video image, the OBU signal corresponding to the license plate information that matches the license plate information of the current lane is searched;

[0095] If an OBU signal that is consistent with the license plate information of the current lane is matched, the RSU antenna of the current lane is traded with the OBU unit corresponding to the OBU signal.

[0096] According to the system for reducing adjacent channel interference in the ETC system disclosed in the above-mentioned implementation manner, the functions to be implemented by each module thereof correspond to the steps of the method for reducing adjacent channel interference in the ETC system disclosed in the above-mentioned implementation manner. During implementation, operations are performed with reference to the above-mentioned implementation manner, which will not be repeated here.

[0097] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for reducing adjacent channel interference in an ETC system, characterized in that: include: The camera integrated in the RSU antenna of the ETC system is used to identify the vehicle images of the current lane and adjacent lanes covered; When a vehicle is identified in the current lane, the RSU antenna of the current lane is turned on to search for a response signal sent by the OBU unit; When there are vehicles in at least two adjacent lanes at the same time, the RSU antennas of the corresponding lanes use 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 antennas of the corresponding lanes use different channels to perform transactions with the OBU units of the corresponding lanes.

2. The method for reducing adjacent channel interference in an ETC system according to claim 1, characterized in that: Also includes: When it is recognized that there is no vehicle in the current lane, the RSU antenna of the current lane is turned off and the OBU search signal is no longer transmitted.

3. The method for reducing adjacent channel interference in an ETC system according to claim 1 or 2, characterized in that: The camera integrated in the RSU antenna of the ETC system is used to identify the vehicle images of the current lane and the adjacent lanes covered. The specific process includes: A camera is integrated into the RSU antenna corresponding to each lane of the ETC system, and the camera can cover the current lane and adjacent lanes for video image acquisition; The vehicle license plate information is obtained by performing recognition based on the collected video images.

4. The method for reducing adjacent channel interference in an ETC system according to claim 3, characterized in that: When a vehicle is identified in the current lane, the RSU antenna of the current lane is turned on to search for a response signal sent by the OBU unit. The specific process includes: According to the identification information of each lane, the RSU controller turns on the RSU antenna corresponding to the lane where the vehicle exists and sends out an OBU search signal to search for the response signal sent by the OBU unit.

5. The method for reducing adjacent channel interference in an ETC system according to claim 3, characterized in that: When the license plate information corresponding to the OBU signal matches the license plate information of the vehicle image collected by the current lane successfully, the RSU antenna of the current lane is traded with the OBU unit. The specific process includes: According to the recognition information of the collected video image, the OBU signal corresponding to the license plate information that matches the license plate information of the current lane is searched; If an OBU signal that is consistent with the license plate information of the current lane is matched, the RSU antenna of the current lane is traded with the OBU unit corresponding to the OBU signal.

6. A system for reducing adjacent channel interference in an ETC system, characterized in that: The method for reducing adjacent channel interference in an ETC system as described in any one of claims 1 to 5 above comprises: A vehicle identification module is used to identify vehicle images of the current lane and adjacent lanes covered by the camera integrated in the RSU antenna of the ETC system; A signal search module is used to turn on the RSU antenna of the current lane to search for a response signal sent by the OBU unit when a vehicle is identified in the current lane; It is also used for when there are vehicles in at least two adjacent lanes at the same time, the RSU antennas of the corresponding lanes use the same channel to search; A matching transaction module is used to trade the RSU antenna of the current lane with the OBU unit when the license plate information corresponding to the OBU signal matches the license plate information of the vehicle image collected by the current lane successfully; It is also used for when there are vehicles in at least two adjacent lanes at the same time, the RSU antennas of the corresponding lanes use different channels to trade with the OBU units of the corresponding lanes.

7. The system for reducing adjacent channel interference in an ETC system according to claim 6, characterized in that: It also includes a signal closing module, which is used to close the RSU antenna of the current lane and no longer transmit the OBU search signal when it is recognized that there is no vehicle in the current lane.

8. The system for reducing adjacent channel interference in an ETC system according to claim 6 or 7, characterized in that: The vehicle identification module is specifically used for: A camera is integrated into the RSU antenna corresponding to each lane of the ETC system, and the camera can cover the current lane and adjacent lanes for video image acquisition; The vehicle license plate information is obtained by performing recognition based on the collected video images.

9. The system for reducing adjacent channel interference in an ETC system according to claim 8, characterized in that: The signal search module is specifically used for: According to the identification information of each lane, the RSU controller turns on the RSU antenna corresponding to the lane where the vehicle exists and sends out an OBU search signal to search for the response signal sent by the OBU unit.

10. The system for reducing adjacent channel interference in an ETC system according to claim 8, characterized in that: The matching transaction module is specifically used for: According to the recognition information of the collected video image, the OBU signal corresponding to the license plate information that matches the license plate information of the current lane is searched; If an OBU signal that is consistent with the license plate information of the current lane is matched, the RSU antenna of the current lane is traded with the OBU unit corresponding to the OBU signal.

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