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Sensitivity calibration system and calibration method thereof, and communication method of onboard unit

An on-board unit and calibration system technology, applied in instruments, ticketing equipment, etc., can solve the problem that the sensitivity of the wake-up or transceiver module cannot be automatically adapted to the degree of attenuation, cannot generally adapt to different vehicle needs, and the vehicle cannot pass through the ETC lane normally. Achieve the effect of flexibility and versatility, improve transaction success rate, and avoid transaction failure

Active Publication Date: 2013-09-18
SHENZHEN GENVICT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to public reports and field measurements, the windshield signal attenuation of the metal heat insulation layer or film is as high as 20-40dB, which means that 99% of the energy in the microwave signal will be absorbed by the front windshield, causing the vehicle to malfunction. Pass ETC Lane Issues
Vehicles with heat-insulated windshields causing ETC to pass through so that it is impossible to install on-board units is a problem that has plagued many years
[0004] However, due to different vehicles, the properties of the windshield are also different, and the degree of attenuation of the signal is also different, so it cannot generally adapt to the needs of different vehicles.
On the other hand, my country does not have a set of mature vehicle unit sensitivity calibration system and method, and the relevant parameters of the vehicle unit cannot be adjusted according to the specific performance requirements of the installed vehicle, resulting in the sensitivity of the wake-up or transceiver module cannot be adjusted according to the windshield. Automatically adapt to signal attenuation

Method used

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  • Sensitivity calibration system and calibration method thereof, and communication method of onboard unit
  • Sensitivity calibration system and calibration method thereof, and communication method of onboard unit
  • Sensitivity calibration system and calibration method thereof, and communication method of onboard unit

Examples

Experimental program
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Embodiment 1

[0036] Such as Figure 1a As shown, this embodiment provides an on-board unit (hereinafter referred to as OBU 110 ) sensitivity calibration system 100 , wherein the calibration system 100 includes an OBU 110 and a standard signal source 130 provided on the outer surface of a vehicle windshield 120 .

[0037] combine Figure 1b As shown, the OBU 110 is a single-chip vehicle-mounted unit, including a main control module 111 , and a transceiver module 112 , a wake-up module 115 , and a calibration module 116 respectively connected to the main control module 111 .

[0038] in,

[0039] The transceiver module 112 has a signal strength value detection unit 1121 for detecting the received microwave signal strength in the vehicle. In order to meet the normal use of OBU110 for vehicles with serious signal attenuation due to windshield 120 (see Figure 1a ), the sensitivity of the transceiver module 112 is higher than the requirements of the industry standard, and it is compatible with...

Embodiment 2

[0060] The calibration system 200 of this embodiment also includes an OBU 210 and a standard signal source 230 disposed outside the windshield 220 , wherein the OBU 210 also belongs to the single-chip vehicle-mounted unit series. Compared with Example 1, the difference: in combination Figure 2a , Figure 2b As shown, the calibration system 200 also includes a hand-held issuer 240, and the calibration module 216 is arranged in the hand-held issuer 240; the OBU 210 includes a main control module 211, and a transceiver module 212 and a wake-up module 215 respectively connected to the main control module 211 , the transceiver module 212 is provided with a signal strength value detection unit 2121 . The handheld issuer 240 is connected to the OBU 210 through the transceiver module 212 , so that the calibration module 216 is placed outside the OBU 210 .

[0061] The hand-held issuer 240 is generally used for OBU210 initialization, primary issuance or secondary issuance, and the c...

Embodiment 3

[0065] The calibration system 300 of this embodiment also includes an OBU 310 and a standard signal source 330 disposed outside the windshield 320 . Compared with Embodiment 1 and Embodiment 2, the difference of this embodiment is that: OBU310 belongs to the series of two-piece vehicle-mounted units, has a card slot, and its internal structure includes a main control module 311, and is connected with the main control module 311 respectively The transceiver module 312, the wake-up module 315 and the card reader module 317; the transceiver module 312 is provided with a signal strength value detection unit 3121. The calibration module 317 of this embodiment is also placed externally on the OBU 310 , but the external calibration module 317 is set in a calibration IC card 380 . Such as Figure 3a As shown, the calibration system 300 also includes a calibration IC card 380 connected to the OBU 310 , the calibration program instructions are set in the calibration IC card 380 , and t...

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Abstract

The invention relates to the field of intelligent transportation applications and especially relates to a sensitivity calibration system and a calibration method thereof, and a communication method of an onboard unit. The sensitivity calibration system comprises a calibration module, a standard signal source and an onboard unit, wherein the calibration module is used for outputting a calibration instruction, the standard signal source is arranged at the outer side of a vehicle windshield and is used for outputting a standard signal with a constant signal strength value, and the onboard unit is arranged at the inner side of the vehicle windshield and is used for being connected with the standard signal source and setting a threshold value corresponding to a difference value between a standard signal strength value and an actual signal strength value and meeting the requirement for the onboard unit to enter a communication state according to the difference value after receiving the calibration instruction sent by the calibration module. The invention further provides a calibration method of the sensitivity calibration system and a communication method of a calibrated onboard unit. The sensitivity calibration system, the calibration method and the communication method of the invention can be applicable to installation of different windshields by calibrating the on-board unit, can make adjustment according to the degree of attenuation of windshields to signals and can be used for solving the problem of poor communication caused by signal attenuation.

Description

technical field [0001] The invention relates to the application field of intelligent transportation, in particular to a system and a calibration method that can be used for calibrating the sensitivity of a vehicle-mounted unit, and a communication method for the calibrated vehicle-mounted unit. Background technique [0002] With the development of the automobile industry, automobile windshields with thermal insulation design are becoming more and more popular on vehicles. This kind of glass adds metal ion components to the material, which is transparent to visible light, but can absorb energy from other radiation spectrums such as infrared and ultraviolet rays. [0003] When a car equipped with such a windshield passes through the ETC lane, the on-board unit will have communication difficulties. Since the microwave will be greatly attenuated when passing through the metal insulation layer or the filmed glass, the additional metal component will absorb the microwave energy. ...

Claims

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Application Information

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IPC IPC(8): G07B15/06
Inventor 张可和向涛李怀山陈静张亮郭云峰陈育成孙占胡维
Owner SHENZHEN GENVICT TECH
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