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Device and method for detecting and positioning ETC jammer

A technology of jammers and monitoring devices, applied in traffic flow detection, instruments, traffic control systems of road vehicles, etc., can solve problems such as inability to effectively trace illegal vehicles, ETC interference, etc., to facilitate tracing and punishment, improve efficiency, and restore The effect of huge losses

Active Publication Date: 2019-09-27
成都安杰联科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a device and method for detecting and locating an ETC jammer in view of the above-mentioned problems; the present invention solves the problem that the vehicle interferes with the ETC when the vehicle passes through the ETC; The problem with illegal vehicles

Method used

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  • Device and method for detecting and positioning ETC jammer
  • Device and method for detecting and positioning ETC jammer
  • Device and method for detecting and positioning ETC jammer

Examples

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Embodiment 1

[0028] A method of detecting and locating ETC jammers such as figure 1 shown, including:

[0029] S1: Set the signal power threshold value.

[0030] In the above steps, after the jammer sends out the interference signal, it will not only affect the passband of the ETC signal, but also affect the outside of the passband. When there is no interference, the signal strength outside the passband of the signal is small, which can be considered as noise; When there is interference, the signal strength outside the signal passband is greatly enhanced, which is considered to be the superposition of noise and interference signals; therefore, a frequency band outside the signal passband can be selected and a signal power threshold value can be set. When the signal power in this frequency band is less than the gate Limit value, no interference is considered; when the signal power in this frequency band is greater than the threshold value, interference is considered. In this way, the dete...

Embodiment 2

[0048] A device for detecting and locating ETC jammers such as figure 2 As shown, it includes a sensing device 1 , a monitoring device 2 and an image acquisition device 3 .

[0049] The sensing device 1 is used to detect whether a vehicle passes through and trigger the detection device; in the present embodiment, the sensing device 1 adopts a phased array antenna, and the phased array antenna is arranged on the gantry at the entrance of the ETC, and the phased array antenna It is a three-beam phased array antenna, which includes 3 antennas that can emit beams. It divides the position in front of the ETC entrance into 3 different areas, and measures the interference field strength in these 3 areas. When the vehicle passes through a certain area will trigger the interference identification device.

[0050] The monitoring device 2 is used to identify whether there is interference from passing vehicles; the detection device includes a radio frequency signal receiver 21 , an anal...

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Abstract

The invention discloses a device and a method for detecting and positioning an ETC jammer. The method comprises the following steps: setting a signal power threshold value; sensing passing vehicles through a phased-array antenna and triggering an interference recognition device; enabling the interference recognition device to receive a signal containing an ETC frequency band through a radio frequency signal receiver and to carry out band-pass filtering on the signal; performing analog-to-digital conversion on the filtered signal; calculating a converted signal power through a signal power algorithm; judging whether the calculated signal power is greater than the threshold value or not; when the interference signal is judged, accurately positioning a vehicle generating interference through image acquisition equipment. According to the method, the power of the out-of-passband signal is calculated and compared with the preset threshold value so as to judge whether the out-of-passband signal is the interference signal, so that whether the received signal is the interference signal can be accurately identified; through cooperation of the image acquisition equipment and the phased-array antenna, information of the vehicle sending out interference signals can be accurately positioned and recorded.

Description

technical field [0001] The invention relates to the field of signal monitoring, in particular to a device and method for detecting and locating an ETC jammer. Background technique [0002] With the continuous development of highways, the number of cars on the highway is also increasing. In order to speed up the efficiency of cars passing through toll stations, the ETC system came into being; in the ETC system, the electronic label (OBU) is placed on the car, and the road The measurement unit (RSU-Road Side Unit) is placed on the gantry. When the vehicle passes through the RSU, microwave communication is used between the OBU and the RSU to realize charging. [0003] At present, some criminals use radio jammers to interfere with the toll collection system of ETC to achieve the purpose of evading tolls, causing certain economic losses, and have a relatively large negative impact on the development of expressway non-stop toll collection. Therefore, there is a need for a device ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08G1/017G08G1/04G08G1/042H04B17/327
CPCG08G1/0175G08G1/04G08G1/042H04B17/327
Inventor 郑智文赖远萱
Owner 成都安杰联科技有限公司
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