CN112017310A - Vehicle monitoring method and road network monitoring system under condition of electromagnetic interference - Google Patents
Vehicle monitoring method and road network monitoring system under condition of electromagnetic interference Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 41
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- 238000004891 communication Methods 0.000 claims description 28
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- 238000007476 Maximum Likelihood Methods 0.000 claims description 7
- 238000012417 linear regression Methods 0.000 claims description 4
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- 244000025254 Cannabis sativa Species 0.000 description 1
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
- G07B15/00—Arrangements or apparatus for collecting fares, tolls or entrance fees at one or more control points
- G07B15/06—Arrangements for road pricing or congestion charging of vehicles or vehicle users, e.g. automatic toll systems
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/017—Detecting movement of traffic to be counted or controlled identifying vehicles
- G08G1/0175—Detecting movement of traffic to be counted or controlled identifying vehicles by photographing vehicles, e.g. when violating traffic rules
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/40—Jamming having variable characteristics
- H04K3/45—Jamming having variable characteristics characterized by including monitoring of the target or target signal, e.g. in reactive jammers or follower jammers for example by means of an alternation of jamming phases and monitoring phases, called "look-through mode"
Abstract
The invention belongs to the field of ETC monitoring, and discloses a vehicle monitoring method under the condition of electromagnetic interference, which comprises the following steps: step 1: reading the license plate number of the vehicle and the equipment number of the OBU equipment or the card number of the CPC card through a camera and RSU equipment which are erected on the same portal frame of the highway network; step 2: sending the license plate number read by the camera to a server, and acquiring the equipment number of the OBU equipment or the card number of the CPC card corresponding to the license plate number from the server; and step 3: and (3) searching one or more equipment numbers or card numbers read by the RSU equipment on the same portal frame where the camera is positioned in a preset time period, judging whether the equipment numbers or card numbers obtained in the step (2) exist, and if not, sending alarm information. The scheme also provides a road network monitoring system.
Description
Technical Field
The invention relates to the field of ETC monitoring, in particular to a vehicle monitoring method and a road network monitoring system under the condition of electromagnetic interference.
Background
An invention patent application CN 201510824599.5 was proposed by southeast university in 2015, and discloses a vehicle type identification method in an ETC system, which comprises the following steps: acquiring induction data of a vehicle to be identified by using a Doppler radar device, and identifying the vehicle type; acquiring corresponding vehicle type information in an electronic tag of a vehicle to be identified and a picture of the vehicle to be identified; comparing the acquired vehicle type information with a vehicle type identification result of the Doppler radar device to obtain a vehicle type comparison result; and executing corresponding operation according to the vehicle type comparison result. By the method, the condition that the vehicle type information corresponding to the electronic tag does not correspond to the vehicle can be found in time, the working efficiency of workers is improved, and the vehicle evasion fee can be effectively avoided.
The method compares the vehicle type information recorded by the electronic tag with the vehicle type information acquired by the radar, and although the comparison result has certain representativeness, the problem of fee evasion cannot be avoided from the aspect of cost.
The existing high-speed system adopts a mode of sectional charging and outlet charging. Charging at the exit port is mainly based On the mileage record of an OBU (On board Unit, microwave device communicating with RSU, which is a typical representative of the existing ETC device) for charging. In practical applications, there are often illegal operations as: and carrying out signal shielding in the road, so that the RSU equipment cannot read the signal of the OBU equipment, and stopping the operation of the shielding equipment when the RSU equipment is close to the gate outlet. This results in very little expense being collected at the exit gate.
Therefore, the technical problem solved by the scheme is as follows: how to prevent the vehicle from escaping at high speed as much as possible.
Disclosure of Invention
The invention aims to provide a vehicle monitoring method under the condition of electromagnetic interference, and also provides a road network monitoring system.
The method is based on identification of a vehicle license plate and OBU equipment on the way, and judges whether the vehicle on the way hides the OBU equipment or interferes with communication of RSU equipment or replaces real OBU equipment corresponding to the vehicle license plate with other OBU equipment.
In order to achieve the purpose, the invention provides the following technical scheme: a method of vehicle monitoring in the presence of electromagnetic interference, comprising the steps of:
step 1: reading the license plate number of a vehicle and the equipment number of OBU equipment or the card number of a CPC card (composite highway pass card) through a camera and RSU equipment (road side unit) erected on the same portal frame of a highway network;
step 2: sending the license plate number read by the camera to a server, and acquiring the equipment number of the OBU equipment or the card number of the CPC card corresponding to the license plate number from the server;
and step 3: and (3) searching one or more equipment numbers or card numbers read by the RSU equipment on the same portal frame where the camera is positioned in a preset time period, judging whether the equipment numbers or card numbers obtained in the step (2) exist, and if not, sending alarm information.
It should be noted that although the existing camera may not be able to accurately identify the license plate number by 100%, it can achieve at least 95% of identification rate. The scheme does not need to identify all possible stealing and evading fee conditions, and the key point of the scheme is that the stealing and evading fee behaviors can be effectively found in the spot check process by the method.
In the above vehicle monitoring method with electromagnetic interference, the method further includes step 4: and judging whether an interference signal exists or not, detecting whether the interference signal exists or not through anti-interference equipment erected on the same portal frame, and adding the signal characteristic of the interference signal into the alarm information if the interference signal exists.
The interference signal judgment in the improved method has two layers of purposes: 1. the warning signal can be sent more certainly because in the above method, if the number of the license plate is read by the camera wrongly, misjudgment is possible, although the discovery of the behavior of stealing and escaping fee is not influenced, the workload of the police can be increased, if the interference signal is found at the same time or in a set time period, such as a time period of 1-3 minutes before and after the license plate is photographed when the warning is determined based on the camera and the RSU, the warning information is more certainly, and the police can act more certainly; 2. the interference signal can be characterized, and powerful support is provided for breaking and locking evidence of illegal behaviors.
Meanwhile, another purpose of the discovery and judgment of the interference signal is that if the condition occurs in the toll station, the timely discovery of the interference signal can avoid large-scale congestion.
We need to understand and note that: most of the technical schemes implemented on the expressway cannot obstruct the traffic, and if the technology can check the evasive fee behaviors on the premise of not obstructing the traffic, and can avoid and solve congestion under specific conditions, the implementation significance of the scheme is more valuable.
In the above vehicle monitoring method under the condition of electromagnetic interference, the step 4 is specifically:
s41: detecting a microwave signal of a lane through anti-interference equipment, and calculating the intensity of the obtained microwave signal; when the intensity of the microwave signal is greater than the preset value, performing S42; if the intensity of the microwave signal is smaller than a preset value, the detection of the microwave signal is abandoned;
s42: sending a request for establishing handshake communication connection, judging whether handshake communication can be established or not, and if not, performing S43; if the microwave signal can be established, the detection of the microwave signal is abandoned;
s43: and adding the intensity and the frequency of the microwave signal into the alarm information in the step 3.
In the above vehicle monitoring method under the condition of electromagnetic interference, in step 3, the preset time period is a time period of 1-3 minutes before and after the license plate number is shot by the camera.
Calculating the intensity of the acquired microwave signal comprises the steps of,
s411, acquiring an intensity curve of the microwave signal;
s412, smoothing the intensity curve, and segmenting the smoothed intensity curve, wherein the intensity deviation of each curve segment is less than 10% of the average intensity value of the curve segments;
s413, calculating a posterior probability density function of each curve segment, and obtaining a maximum likelihood estimation value of each curve segment according to the posterior probability density function;
and S414, performing linear regression by using all maximum likelihood estimation values, and fitting to obtain the final microwave signal intensity.
In step S413, the posterior probability density function of the curve segment is modified by using the pole of the curve segment, so that the probability of the pole corresponding to the posterior probability density function is greater than the average value of the posterior probability density functions.
Meanwhile, the invention also discloses a road network monitoring system under the condition of electromagnetic interference, which comprises one or more portal frames and a server, wherein the one or more portal frames and the server are arranged on a highway network, the portal frames are provided with monitoring units, and the monitoring units comprise controllers, cameras, RSU equipment and communication modules;
the camera is used for reading the license plate number of the vehicle;
the RSU equipment is used for reading the equipment number of OBU equipment carried by a vehicle passing through the portal frame or the card number of the CPC card;
the controller is used for sending the license plate number to the server through the communication module, receiving the equipment number of the OBU equipment or the card number of the CPC card corresponding to the license plate number from the server, searching whether the equipment number of the OBU equipment or the card number of the CPC card sent by the server exists in one or more equipment numbers or card numbers read by the RSU equipment within a preset time period, and sending an alarm signal if the equipment number or the card number of the CPC card does not exist;
and the server is used for sending the acquired license plate number to the server to find the pre-stored equipment number of the OBU equipment or the card number of the CPC card and sending the pre-stored equipment number or the card number of the CPC card to the monitoring unit.
The road network monitoring system under the condition of electromagnetic interference further comprises an anti-interference device arranged on the portal frame, wherein the anti-interference device is used for detecting whether an interference signal exists in the lane or not, and if the interference signal exists in the lane, the signal characteristics of the interference signal are sent to the controller.
In the above road network monitoring system with electromagnetic interference, the anti-interference device includes the following sub-modules:
a signal detection submodule: the system comprises a controller, a signal acquisition unit, a signal processing unit and a signal processing unit, wherein the controller is used for detecting microwave signals of a lane and calculating the intensity of the acquired microwave signals;
a communication connection establishing submodule: the device is used for sending a request for establishing handshake communication connection to microwave signals with overlarge intensity screened out by the signal detection submodule and judging whether handshake communication can be established or not;
a signal processing submodule: and when the communication connection establishing sub-module can not establish communication connection with the microwave signal, sending the intensity and the frequency of the microwave signal to the controller.
In the above road network monitoring system with electromagnetic interference, the warning information includes a license plate number read by the camera and a position of a next gantry, and the warning information further includes an equipment number of the OBU equipment or a card number of the CPC card acquired by the RSU equipment, and a model or an appearance of the vehicle acquired by the camera.
Compared with the prior art, the invention has the beneficial effects that:
the invention obtains the license plate number through the camera, and obtains the equipment number of the OBU equipment or the card number of the CPC card through the RSU equipment; the method comprises the steps of obtaining the equipment number of the OBU equipment or the card number of the CPC card from a background through the license plate number, searching the equipment number of the OBU equipment or the card number of the CPC card from the equipment number of the OBU equipment or the card number of the CPC card obtained by the RSU, and determining whether the OBU or the CPC card is shielded or whether other license plates are fake or whether other OBU or CPC cards are used for disguising the OBU or CPC card originally and actually carried by the vehicle.
Because the intensity of the microwave signal is always in the fast fluctuation, if the point is simply taken and evaluated, the deviation between the calculated value and the actual value is large. In order to overcome the technical problem, the invention improves the calculation method of microwave signal intensity, obtains the maximum likelihood estimation value by segmentation, and then carries out a linear regression fitting processing mode to carry out peak elimination fusion on a large number of fluctuation components in the intensity signal, thereby improving the consistency of the calculated value and the actual value. When the posterior probability density function is calculated, the posterior probability density function of the curve segment is corrected by utilizing the pole of the curve segment, so that the simulation accuracy of the posterior probability density function can be ensured.
In a word, the method can accurately judge whether the vehicle relates to fee evasion, and can accurately identify the vehicle if the vehicle relates to fee evasion.
Meanwhile, the scheme also provides a road network monitoring system based on the method.
Drawings
FIG. 1 is a flow chart of the method of example 1 of the present invention;
FIG. 2 is a flow chart of the method of example 1 of the present invention;
fig. 3 is a schematic structural diagram of a system according to embodiment 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1-2, a vehicle monitoring method with electromagnetic interference includes the following steps:
step 1: reading the license plate number of the vehicle and the equipment number of the OBU equipment or the card number of the CPC card through a camera and RSU equipment which are erected on the same portal frame of the highway network;
the principle that the camera reads the license plate lies in: an induction coil is generally embedded in a lane, and when a vehicle passes through the induction coil, a camera takes a picture, which is common knowledge.
When the toll settlement is performed at the toll station, the toll system reads the feedback signals recorded in the ETC equipment and the CPC card, and then the toll detail of each section can be performed, and the total fee can be calculated for charging.
It should be noted that, based on the different qualities of the OBU device and the CPC card, the RSU device may read the signal at different times, if the OBU device and the CPC card have good qualities, the RSU device may read the signal at a faster time, and if the OBU device and the CPC card have general qualities, the RSU device may read the relevant signal only when the vehicle may be driven below the portal frame.
While step 1 is performed, it is also preferable to perform interference signal detection, because in most of the fee evasion users, interference signals are used, specifically, referring to step 4, before performing the discussion of step 4, a specific manner in which the interference signals interfere with the RSU is described: the interference signal is sent by using a high-intensity radio signal, and the RSU preferably processes the high-intensity signal, so that the true OBU or CPC signal is leaked, and the interference mode is low in cost, does not need to additionally process the OBU, can be closed and hidden, and is the first choice of an illegal person.
Therefore, the scheme is additionally provided with the step 4: judging whether an interference signal exists or not, detecting whether the interference signal exists or not through anti-interference equipment erected on the same portal frame, and adding the signal characteristics of the interference signal into alarm information if the interference signal exists; the step 4 specifically comprises the following substeps:
s41: detecting the microwave signal of the lane through anti-interference equipment, acquiring the intensity and frequency of the microwave signal, and calculating the intensity of the acquired microwave signal; when the intensity of the microwave signal is greater than the preset value, performing S42; if the intensity of the microwave signal is smaller than a preset value, the detection of the microwave signal is abandoned;
s42: sending a request for establishing handshake communication connection, judging whether handshake communication can be established or not, and if not, performing S43; if the microwave signal can be established, the detection of the microwave signal is abandoned;
s43: and adding the intensity and the frequency of the microwave signal into the alarm information in the step 3.
Calculating the intensity of the acquired microwave signal comprises the steps of,
s411, acquiring an intensity curve of the microwave signal;
s412, smoothing the intensity curve, and segmenting the smoothed intensity curve, wherein the intensity deviation of each curve segment is less than 10% of the average intensity value of the curve segments;
s413, calculating a posterior probability density function of each curve segment, and obtaining a maximum likelihood estimation value of each curve segment according to the posterior probability density function;
and S414, performing linear regression by using all the maximum likelihood estimation values, and fitting to obtain the final microwave signal intensity.
In step S413, the posterior probability density function of the curve segment is modified by using the pole of the curve segment, so that the probability of the pole corresponding to the posterior probability density function is greater than the average value of the posterior probability density functions.
The advantage of adding the information of the microwave signal to the warning information is that the traffic police can intercept the vehicle at any position between the two portal frames and perform interference signal evidence collection on the illegal vehicle without intercepting at the next portal frame. Specifically, if the traffic police receives the alarm information, the microwave signal can be obtained through the vehicle-mounted anti-interference device which is the same as that in the step 4, the evidence can be fixed when the microwave signal is obtained, and even if the traffic police stops the vehicle and then the vehicle owner closes the interference device, the traffic police still has enough evidence to prove that the illegal behavior that the normal operation of the high-speed device is damaged through signal interference can be realized.
Simultaneously, the step 4 further comprises: and detecting whether the interference signal exists all the time, if so, sending another alarm message to prompt a traffic police that an interference source is placed near the portal frame or the toll station and needs to be eliminated.
The method for positioning and discharging the interference source comprises the following steps: the anti-interference equipment adopts a structure with a rotatable antenna, receives microwave signals through the rotation of the antenna, and judges which direction the microwave signals are strongest, so that the direction of an interference source can be known, and the interference source is generally placed in a grass, so that the mode is feasible and effective.
Step 2: sending the license plate number read by the camera to a server, and acquiring the equipment number of the OBU equipment or the card number of the CPC card corresponding to the license plate number from the server;
the server is a remote server, and a license plate of a vehicle handling the ETC card and the equipment number of the OBU equipment are stored in the server; if the vehicle does not handle ETC or does not use ETC, when driving into high speed, the vehicle generally gets the CPC card, and at this moment, the entry gate can be with information transmission to server, and the server can carry out the associative storage with CPC card and license plate number.
And step 3: and (3) searching one or more equipment numbers or card numbers read by the RSU equipment on the same portal frame where the camera is positioned in a preset time period, judging whether the equipment numbers or card numbers obtained in the step (2) exist, and if not, sending alarm information. According to the quality difference of the OBU device and the CPC card, the preset time period in this embodiment generally refers to an information pool formed by the device number of the OBU device or the card number of the CPC card read by the RSU device within a time period of 1 minute before and after the license plate number is read by the camera, and whether a constant device number or card number exists is inquired from the information pool of the device number and the card number acquired by the server.
If the corresponding equipment number and card number exist in the information pool in the step 3, no alarm is given, if the equipment number and card number do not exist, the alarm is given, and the sending object of the alarm information can be a server or a road administration supervisor or a traffic police. The related alarm information comprises the license plate number and the position of the next portal frame related to the step 1, and even can comprise the following steps: the equipment number of the OBU equipment or the card number of the CPC card related in the step 1, and the model or the appearance of the vehicle obtained by the camera in the step 1.
In the embodiment, the license plate number is obtained through the camera, and the equipment number of the OBU equipment or the card number of the CPC card is obtained through the RSU equipment; the method comprises the steps of obtaining the equipment number of the OBU equipment or the card number of the CPC card from a background through the license plate number, searching the equipment number of the OBU equipment or the card number of the CPC card from the equipment number of the OBU equipment or the card number of the CPC card obtained by the RSU, and determining whether the OBU or the CPC card is shielded or whether other license plates are fake or whether other OBU or CPC cards are used for disguising the OBU or CPC card originally and actually carried by the vehicle.
In a word, the method can accurately judge whether the vehicle relates to fee evasion, and can accurately identify the vehicle if the vehicle relates to fee evasion.
The only situation that the alarm cannot be correctly given exists in the embodiment: in the case where the license plate cannot be recognized due to heavy fog, heavy rain, or the like, such extreme weather conditions are not considered in the present embodiment.
Example 2
Referring to fig. 3, a road network monitoring system under the condition of electromagnetic interference includes a plurality of portal frames 1 and servers 2 arranged on a highway network, wherein the portal frames 1 are provided with monitoring units 3, and each monitoring unit 3 includes a controller 4, a camera 5, RSU equipment 6, a communication module 7 and anti-interference equipment 8;
the camera 5 is used for reading the license plate number of the vehicle;
the RSU equipment 6 is used for reading the equipment number of OBU equipment carried by a vehicle passing through the portal frame 1 or the card number of a CPC card;
the anti-jamming device 8 is used for detecting whether a jamming signal exists in the lane, and if the jamming signal exists in the lane, the signal characteristic of the jamming signal is sent to the controller 4.
It includes the following sub-modules:
the signal detection sub-module 81: the system comprises a controller, a signal acquisition unit, a signal processing unit and a signal processing unit, wherein the controller is used for detecting microwave signals of a lane and calculating the intensity of the acquired microwave signals;
the communication connection establishment sub-module 82: the device is used for sending a request for establishing handshake communication connection to microwave signals with overlarge intensity screened out by the signal detection submodule and judging whether handshake communication can be established or not; an excessive microwave signal generally means exceeding the maximum signal strength of the OBU device.
The signal processing sub-module 83: and when the communication connection establishing sub-module can not establish communication connection with the microwave signal, sending the intensity and the frequency of the microwave signal to the controller.
The controller 4 is configured to send the license plate number to the server 2 through the communication module 7, receive the device number of the OBU device or the card number of the CPC card corresponding to the license plate number from the server 2, and search for whether the device number of the OBU device or the card number of the CPC card sent by the server 2 exists in one or more device numbers or card numbers read by the RSU device 6 within a preset time period, and if not, send an alarm signal; the preset time period is 1 minute before and after the license plate number shot by the camera 5; the alarm information comprises the license plate number read by the camera 5 and the position of the next portal frame 1; in the road network monitoring system with electromagnetic interference, the alarm information further includes the device number of the OBU device or the card number of the CPC card acquired by the RSU device 6, and the model or appearance of the vehicle acquired by the camera 5;
the server 2 is used for sending the obtained license plate number to the server 2 to find the pre-stored equipment number of the OBU equipment or the card number of the CPC card and sending the pre-stored equipment number or the card number of the CPC card to the monitoring unit 3, and the server 2 is also used for: if the vehicle gets the CPC card when driving into the high speed, the corresponding relation between the CPC card and the license plate number is stored.
The working process is as follows: the expressway is provided with a plurality of portal frames 1, each portal frame 1 is provided with a camera 5 and RSU equipment 6, the camera 5 reads the license plate number of a passing vehicle, and the RSU equipment 6 reads the numbers of OBUs and CPC cards carried by the vehicle. The controller 4 controls the server 2 to send the license plate number read by the camera 5 to the server 2, the server 2 inquires the numbers of the OBU and the CPC card corresponding to the license plate number and sends the numbers to the controller 4, the controller 4 finds the numbers of the OBU and the CPC card which are matched with each other from the number pool of the RSU equipment 6, if yes, the alarm is not given, and if not, the alarm is given. The high-speed police can intercept the vehicle corresponding to the license plate at the next portal frame 1 for checking.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. A method of monitoring a vehicle in the presence of electromagnetic interference, comprising the steps of:
step 1: reading the license plate number of the vehicle and the equipment number of the OBU equipment or the card number of the CPC card through a camera and RSU equipment which are erected on the same portal frame of the highway network;
step 2: sending the license plate number read by the camera to a server, and acquiring the equipment number of the OBU equipment or the card number of the CPC card corresponding to the license plate number from the server;
and step 3: and (3) searching one or more equipment numbers or card numbers read by the RSU equipment on the same portal frame where the camera is positioned in a preset time period, judging whether the equipment numbers or card numbers obtained in the step (2) exist, and if not, sending alarm information.
2. The method for monitoring the vehicle with the electromagnetic interference according to claim 1, further comprising the step 4: and judging whether an interference signal exists or not, detecting whether the interference signal exists or not through anti-interference equipment erected on the same portal frame, and adding the signal characteristic of the interference signal into the alarm information if the interference signal exists.
3. The vehicle monitoring method under electromagnetic interference according to claim 2, wherein the step 4 is specifically:
s41: detecting a microwave signal of a lane through anti-interference equipment, and calculating the intensity of the obtained microwave signal; when the intensity of the microwave signal is greater than the preset value, performing S42; if the intensity of the microwave signal is smaller than a preset value, the detection of the microwave signal is abandoned;
s42: sending a request for establishing handshake communication connection, judging whether handshake communication can be established or not, and if not, performing S43; if the microwave signal can be established, the detection of the microwave signal is abandoned;
s43: and adding the intensity and the frequency of the microwave signal into the alarm information in the step 3.
4. The vehicle monitoring method with electromagnetic interference of claim 3, characterized in that the calculation of the intensity of the acquired microwave signal comprises the steps of,
s411, acquiring an intensity curve of the microwave signal;
s412, smoothing the intensity curve, and segmenting the smoothed intensity curve, wherein the intensity deviation of each curve segment is less than 10% of the average intensity value of the curve segments;
s413, calculating a posterior probability density function of each curve segment, and obtaining a maximum likelihood estimation value of each curve segment according to the posterior probability density function;
and S414, performing linear regression by using all the maximum likelihood estimation values, and fitting to obtain the final microwave signal intensity.
5. The method according to claim 4, wherein in step S413, the posterior probability density function of the curve segment is modified by using the poles of the curve segment, so that the probability that the poles correspond to the posterior probability density function is greater than the average value of the posterior probability density function.
6. The method for monitoring the vehicle with the electromagnetic interference of claim 1, wherein the alarm information includes a license plate number related to step 1, a position of a next portal frame, an equipment number of the OBU equipment or a card number of the CPC card related to step 1, and a model or an appearance of the vehicle obtained by the camera of step 1.
7. A road network monitoring system with electromagnetic interference for realizing the method of any one of claims 1 to 6, characterized by comprising one or more portal frames and a server, wherein the portal frames are arranged on a highway network, the portal frames are provided with monitoring units, and the monitoring units comprise controllers, cameras, RSU equipment and communication modules;
the camera is used for reading the license plate number of the vehicle;
the RSU equipment is used for reading the equipment number of OBU equipment carried by a vehicle passing through the portal frame or the card number of the CPC card;
the controller is used for sending the license plate number to the server through the communication module, receiving the equipment number of the OBU equipment or the card number of the CPC card corresponding to the license plate number from the server, searching whether the equipment number of the OBU equipment or the card number of the CPC card sent by the server exists in one or more equipment numbers or card numbers read by the RSU equipment within a preset time period, and sending an alarm signal if the equipment number or the card number of the CPC card does not exist;
and the server is used for sending the acquired license plate number to the server to find the pre-stored equipment number of the OBU equipment or the card number of the CPC card and sending the pre-stored equipment number or the card number of the CPC card to the monitoring unit.
8. The system according to claim 7, further comprising an anti-jamming device installed on the gantry, wherein the anti-jamming device is configured to detect whether there is a jamming signal in the lane, and if so, send a signal characteristic of the jamming signal to the controller.
9. Road network monitoring system with emi as claimed in claim 8, characterized in that said anti-jamming device comprises the following sub-modules:
a signal detection submodule: the system comprises a controller, a signal acquisition unit, a signal processing unit and a signal processing unit, wherein the controller is used for detecting microwave signals of a lane and calculating the intensity of the acquired microwave signals;
a communication connection establishing submodule: the device is used for sending a request for establishing handshake communication connection to microwave signals with overlarge intensity screened out by the signal detection submodule and judging whether handshake communication can be established or not;
a signal processing submodule: and when the communication connection establishing sub-module can not establish communication connection with the microwave signal, sending the intensity and the frequency of the microwave signal to the controller.
10. The system for monitoring road network under electromagnetic interference according to claim 7, wherein said warning information includes the number plate read by the camera, the position of the next gantry, the device number of the OBU device or the card number of the CPC card acquired by the RSU device, and the model or appearance of the vehicle acquired by the camera.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010708982.5A CN112017310A (en) | 2020-07-20 | 2020-07-20 | Vehicle monitoring method and road network monitoring system under condition of electromagnetic interference |
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