CN112037343A - Multi-angle antenna device for road side unit - Google Patents

Abstract

The present invention provides a multi-angle antenna device for a roadside unit. It includes: a system controller 2, a microwave communication module 3, a ring camera 4, and multiple groups of antennas 9 to 12. The camera system 4 has a 360° shooting angle and can identify the vehicle position through image processing. Multiple groups of antennas 9 to 12 are arranged along the shooting angle of view, and the action range of each group of antennas corresponds to different areas in the shooting angle of view. The microwave communication module 3 connects the corresponding antennas 9 to 12 according to the vehicle position identified by the ring camera 4, and communicates with the vehicle-mounted electronic tag on the vehicle to obtain vehicle information.

Description

A multi-angle antenna device for roadside unit

technical field

The present invention relates to multi-angle antenna arrangements for roadside units (RSUs), and more particularly.

Background technique

The phenomenon of random parking on the street not only affects the image of the city, but also causes great obstacles to the traffic of car owners. When individual vehicles pass through the high-speed toll gate, they deliberately follow the car to avoid the high-speed toll collection and automatically deduct the toll. Illegal acts such as counterfeiting others' license plates also occur from time to time, affecting traffic safety.

With the ETC policy "Accelerating the Implementation of Expressway Electronic Non-stop Express Toll Collection Application Service Implementation Plan" issued by the Ministry of Transport in 2019, and the preferential policies launched by major banks, the penetration rate of ETC vehicles installed by the end of 2019 reached more than 90%, and ETC equipment On-board electronic label (OBU) will become the unique electronic identification of vehicle identity.

The existing ETC roadside parking toll collection device uses the camera to identify the vehicle type and license plate information, and further uses the RSU to read the vehicle information in the vehicle-mounted electronic tag to improve the recognition accuracy. Due to the small coverage of the RSU antenna in the width direction, it is very difficult to install and debug the antenna. And in the process of use, the deviation of the antenna position is not easy to be found, and it usually needs to be checked regularly. The maintenance workload is huge when it is used in large quantities, which affects the popularity of ETC-type on-street parking toll collection devices.

The purpose of the present invention is to provide an antenna device for a multi-angle roadside unit, which is used to solve the problem of difficult installation and debugging of the RSU antenna.

SUMMARY OF THE INVENTION

The first technical solution of the present invention is a multi-angle antenna device for roadside units, which is characterized by comprising: a vehicle signal transceiver, a camera system, multiple groups of antennas, and an antenna adapter,

The camera system has a certain shooting angle, is set on the roadside to capture the image of the vehicle, and recognizes the vehicle and the position of the vehicle through image processing,

The multiple groups of antennas are arranged along the shooting angle of view of the camera system, and the scope of action of each group of antennas respectively corresponds to different areas in the shooting angle of view,

The vehicle signal transceiver communicates with the vehicle electronic tag to obtain vehicle information,

The antenna adapter connects the antenna corresponding to the vehicle position with the vehicle signal transceiver according to the vehicle position identified by the camera system.

The second technical solution is based on the first technical solution, and the action ranges of the multiple groups of antennas in the horizontal direction are seamlessly connected or partially overlapped.

The third technical solution is based on the second technical solution, and the camera system has a shooting angle of 360°.

The fourth technical solution is based on the third technical solution, and the camera in the camera system is a dome camera or a bolt camera.

The fifth technical solution is based on the third technical solution, wherein the camera system recognizes the model and license plate of the vehicle through image processing, and the vehicle signal transceiver obtains the model and license plate information of the vehicle by communicating with the vehicle-mounted electronic tag.

The sixth technical solution is based on the third technical solution, and the antenna is a microwave antenna.

The seventh technical solution is based on the sixth technical solution, wherein the antenna is a microstrip high-gain array antenna or a phased array antenna, and the wave speed scanning is realized by controlling the phase and power distribution ratio of each antenna element of the array antenna.

The eighth technical solution is based on the seventh technical solution, and the polarization mode of the antenna is right-hand circular polarization or linear polarization.

The ninth technical solution is based on the seventh technical solution, and includes a system controller (2), a communication module, and a security authentication module (13), the communication module, the security authentication module (13), the camera system (4), the The vehicle signal transceiver is connected with the system controller (2),

The communication module includes any one or a combination of a network port communication module (5), an RS485 communication module (6), a WIFI communication module (7), a 4G/5G communication module (8), and a Bluetooth communication module (14) .

The tenth technical solution is based on any of the third to ninth technical solutions, and includes a microwave communication module (3), consisting of a controller (30), a microwave transceiver (31), a power amplifier (32), and a low-noise amplifier (33) ), a single-pole double-throw switch (34), a single-pole 4-throw switch (35), a network port transceiver (36), and a connector (37),

The controller (30), the microwave transceiver (31), the power amplifier (32), the low noise amplifier (33), the single-pole double-throw switch (34), the network port transceiver (36), and the connector (37) serve as the The vehicle signal transceiver communicates with the vehicle electronic tag to obtain vehicle information,

The SPDT switch (34) is used as the antenna adapter to connect the antenna corresponding to the vehicle position.

Description of drawings

FIG. 1 is an explanatory diagram of the structure of a multi-angle antenna device for a roadside unit;

FIG. 2 is an explanatory diagram of the structure of the power module;

FIG. 3 is an explanatory diagram of the structure of the microwave communication module.

Detailed ways

In order to make the purpose, technical solutions and effects of the present invention more clearly expressed, the technical solutions of the present invention are further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

FIG. 1 is an explanatory diagram of the structure of a multi-angle antenna device for a roadside unit. As shown in Figure 1, the multi-angle antenna device mainly includes a power module 1, a system controller 2, a microwave communication module 3, a dome camera (camera system) 4, a network port communication module 5, an RS485 communication module 6, and a WIFI communication module 7 , 4G/5G communication module 8, Bluetooth communication module 14, antenna (front) 9, antenna (rear) 10, antenna (left) 11, antenna (right) 12, security authentication module 13 and so on.

The system controller 2 communicates with the microwave communication module 3 through LAN1, through the LAN2 dome camera (camera system) 4, through the SPI1 and the network port communication module 5, through the UART1 and the RS485 communication module 6, through the USB1 port and the WIFI communication module 7, It is connected with the 4G/5G communication module 8 through the USB2 port, with the Bluetooth communication module 14 through the SPI3 port, and with the security authentication module 13 through the SPI1.

The network port communication module 5, the RS485 communication module 6, the WIFI communication module 7, the 4G/5G communication module 8, and the Bluetooth communication module 14 are used as communication modules to send the acquired information to an external server or receive instructions. The security authentication module 13 performs security management of the system controller 2 .

The dome camera 4 is set in, for example, a roadside parking lot, and is used to monitor vehicles entering the roadside parking lot. The dome camera 4 has a 360° shooting angle of view, and can monitor the situation in the roadside parking lot within 360° in the horizontal direction. The dome camera 4 has an image processing function, and can accurately identify the vehicle type and license plate information entering the parking area through image processing of the captured image.

The antenna (front) 9, the antenna (rear) 10, the antenna (left) 11, and the antenna (right) 12 are evenly distributed in four positions along the shooting angle of the dome camera 4. The front of the shooting angle of view, the range of action of the antenna 10 corresponds to the back of the shooting angle of view, the range of action of the antenna 11 corresponds to the left of the shooting angle of view, the range of action of the antenna 12 corresponds to the right of the shooting angle of view, and the four antennas (9-12) ) in the horizontal direction are seamlessly connected or partially overlapped.

In this embodiment, the antennas 9, 10, 11, and 12 are microstrip high-gain array antennas, or phased array antennas. By controlling the phase and power distribution ratio of each antenna element of the array antenna, wave speed scanning is realized, and the vehicle position can be located. . The antenna polarization is preferably right-handed circular polarization, but may also be linear polarization. The form of the antenna can also be other forms of antennas, such as a horn antenna, a waveguide slot antenna, etc., as long as the four antennas can cover 360 degrees in the horizontal direction to ensure that there is no blind spot in the microwave communication in the horizontal direction. The structure of the antenna is not limited to the above forms. Any antenna that can communicate with the OBU on the vehicle and has a smaller range of action than the shooting angle of the dome camera 4, and the combined range of action is applicable to the antenna corresponding to the entire shooting angle.

Under the control of the system controller 2, the dome camera performs 424-hour monitoring of the roadside. When a vehicle is captured, the image processing system in the dome camera 4 performs image processing on the image, detects the vehicle position, and identifies the vehicle model. and vehicle information such as vehicle registration number.

After the system controller 2 obtains the vehicle position information detected by the dome camera 4, it starts the microwave communication module 3 to communicate with the OBU on the vehicle to obtain vehicle information such as the vehicle type and vehicle number plate.

The microwave communication module 3 inputs the vehicle location information from the system controller 2, and connects to the antenna corresponding to the vehicle location for communication. Therefore, even if the coverage (action range) of the antennas (9-12) in the width (horizontal) direction is narrow, the microwave communication module 3 can correctly communicate with the OBU on the vehicle without the deviation of the antenna position However, the problem that vehicle information (such as model and license plate information) cannot be read occurs. That is, in the present invention, the four antennas and the dome camera 4 are pre-fixed together, and there is no need to adjust the position of each antenna during installation, nor to periodically detect and adjust.

When the system controller 2 sends the vehicle information to the server, it can also compare the vehicle information from the dome camera 4 with the vehicle information from the microwave communication module 3. When the two are consistent, the vehicle information is sent to the server to improve the accuracy of the vehicle information. correctness.

FIG. 2 is an explanatory diagram of the structure of the power supply module. The power supply module 1 is used to provide different voltages required for each module. The input voltage of the power supply module is AC 220V, and after passing through the switching power supply module 20, it outputs a DC voltage of 12V, and the voltage of 12V is output through the DC/DC power supply chip and the filter circuit 21. The terminal outputs a DC voltage of 5V, and the voltage of 5V then outputs different voltages such as 3.3V, 3V, and 1.8V after passing through LDOs with different output voltages and the filter circuit 22 to provide working voltages for each module.

FIG. 3 is an explanatory diagram of the structure of the microwave communication module. As shown in FIG. 3 , the microwave communication module 3 consists of a controller 30, a microwave transceiver 31, a power amplifier (PA) 32, a low noise amplifier (LNA) 33, a single-pole double-throw connector (SPDT) 34, and a single-pole 4-throw connector (SP4T) 35, a network port transceiver 36, and a connector 37 are composed. The controller 30 is connected to the microwave transceiver 31 through SPI1, and is connected to the network port transceiver 36 through SPI2. The microwave transceiver 31 realizes modulation and demodulation of 5.8GHz microwave signals. The power amplifier (PA) 32 can amplify the transmitted signal to a certain power, and then radiate it to the antenna. A low noise amplifier (LNA) 33 further amplifies the weak signal received by the antenna.

The single-pole double-throw connector 34 realizes the switching of signal reception and transmission. The single-pole 4-throw connector 35 implements the function of selecting and connecting the antenna 9 , the antenna 10 , the antenna 11 , and the antenna 12 , that is, according to the vehicle position information, selecting the corresponding antenna for the connection function.

For example, when the dome camera 4 recognizes the information of the vehicle ahead, the single-pole 4-throw 35 is connected to the front antenna 9, and the microwave transceiver 31 communicates with the on-board electronic label (OBU) in the front vehicle through the front antenna 9 to obtain vehicle information or Handling parking charges.

The controller 30, the microwave transceiver 31, the power amplifier 32, the low noise amplifier 33, the single-pole double-throw switch connector 34, the network port transceiver 36, and the connector 37 constitute the claims, and are used to communicate with the vehicle-mounted electronic tag to obtain the vehicle. information to the vehicle signal transceiver.

The single-pole, 4-throw connector 35 constitutes an antenna adapter for connecting an antenna corresponding to a vehicle position in the claims.

In this embodiment, a dome camera with a shooting angle of 360° is used to detect the position of the vehicle and the vehicle model and license plate information, but the camera can also be used for shooting.

The number of antennas is not limited to four groups, and can be arbitrarily selected according to the coverage of the antennas.

As a camera system, it is not limited to a dome camera or a bolt camera with a shooting angle of 360°. Various other forms of camera mechanisms can also be used. As long as it has a wide shooting angle of view, it can cover the range that needs to be detected.

Beneficial effects brought about by the technical solution of the present invention

The multi-angle antenna device of the present invention not only has the function of video recognition, can accurately recognize various models and license plates, but also has the function of microwave communication, which can read the vehicle information in the in-vehicle electronic label (OBU) by microwave. The dome camera 4 detects the vehicle, and after recognizing the vehicle position, the microwave communication module 3 will automatically select the antenna in the corresponding direction, and then conduct microwave communication. communicate with the OBU on the vehicle and can locate the vehicle.

Compared with the traditional single antenna line side device, since the multi-angle antenna device of the present invention has a field of view of 360°, the trouble of manually adjusting the installation angle of the antenna during installation is avoided. Various communication methods such as network port, RS485, WIFI, 4G/5G, Bluetooth, etc. can be selected for communication with external servers. Among them, WIFI, 4G/5G, and Bluetooth communication methods do not require wiring and are easy to install. In addition, maintenance work such as regular inspection is not required, which reduces the cost of use.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Any person skilled in the art can easily obtain changes and alternatives within the technical scope described in the present invention. , should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (10)

1. A multi-angle antenna device for a roadside unit, characterized in that it comprises: a vehicle signal transceiver, a camera system, multiple groups of antennas, an antenna adapter, The camera system has a certain shooting angle, is set on the roadside to capture the image of the vehicle, and recognizes the vehicle and the position of the vehicle through image processing, The multiple groups of antennas are arranged along the shooting angle of view of the camera system, and the scope of action of each group of antennas respectively corresponds to different areas in the shooting angle of view, The vehicle signal transceiver communicates with the vehicle electronic tag to obtain vehicle information, The antenna adapter connects the antenna corresponding to the vehicle position with the vehicle signal transceiver according to the vehicle position identified by the camera system. 2 . The multi-angle antenna device for a roadside unit according to claim 1 , wherein the action ranges of the multiple groups of antennas in the horizontal direction are seamlessly connected or partially overlapped. 3 . 3 . The multi-angle antenna device for roadside units according to claim 2 , wherein the camera system has a shooting angle of 360°. 4 . 4 . The multi-angle antenna device for a roadside unit according to claim 3 , wherein the camera in the camera system is a dome camera or a bolt camera. 5 . 5 . The multi-angle antenna device for roadside units according to claim 3 , wherein the camera system recognizes the vehicle type and license plate through image processing, and the vehicle signal transceiver communicates with the vehicle-mounted electronic tag. 6 . Get the model and license plate information of the vehicle. 6 . The multi-angle antenna device for a roadside unit according to claim 3 , wherein the antenna is a microwave antenna. 7 . 7. The multi-angle antenna device for a roadside unit according to claim 6, wherein the antenna is a microstrip high-gain array antenna or a phased array antenna, and the phase and the phase of each antenna unit of the array antenna are controlled by Power distribution ratio to achieve wave speed scanning. 8 . The multi-angle antenna device for a roadside unit according to claim 7 , wherein the polarization mode of the antenna is right-hand circular polarization or linear polarization. 9 . 9. The multi-angle antenna device for a roadside unit according to claim 7, further comprising: a system controller (2), a communication module, and a safety authentication module (13), wherein the communication module, safety authentication The module (13), the camera system (4), the vehicle signal transceiver are connected with the system controller (2), The communication module includes any one or a combination of a network port communication module (5), an RS485 communication module (6), a WIFI communication module (7), a 4G/5G communication module (8), and a Bluetooth communication module (14) . 10. The multi-angle antenna device for a roadside unit according to any one of claims 3 to 9, characterized in that it comprises a microwave communication module (3), which consists of a controller (30), a microwave transceiver (31) ), a power amplifier (32), a low noise amplifier (33), a single-pole double-throw switch (34), a single-pole 4-throw switch (35), a network port transceiver (36), and a connector (37), The controller (30), the microwave transceiver (31), the power amplifier (32), the low noise amplifier (33), the single-pole double-throw switch (34), the network port transceiver (36), and the connector (37) serve as the The vehicle signal transceiver communicates with the vehicle electronic tag to obtain vehicle information, The SPDT switch (34) is used as the antenna adapter to connect the antenna corresponding to the vehicle position.

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