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A sensitivity calibration system and its calibration method

A technology for calibrating the system and sensitivity, applied in the direction of instruments, ticketing equipment, etc., can solve the problems of wake-up or automatic adaptation of the sensitivity of the transceiver module that cannot be attenuated, vehicles cannot normally pass through the ETC lane, and cannot generally adapt to different vehicle needs, etc., to achieve With flexibility and versatility, the effect of improving the success rate of transactions and avoiding transaction failures

Active Publication Date: 2018-01-26
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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  • A sensitivity calibration system and its calibration method
  • A sensitivity calibration system and its calibration method
  • A sensitivity calibration system and its calibration method

Examples

Experimental program
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Effect test

Embodiment 1

[0036] like Figure 1a As shown, this embodiment provides a sensitivity calibration system 100 of an on-board unit (hereinafter referred to as OBU110 ), wherein the calibration system 100 includes the OBU110 and a standard signal source 130 disposed on the outer surface of the 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 , 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 severe 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, which is the same as that of...

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 both belong to the series of single-piece vehicle-mounted units. Compared with Example 1, the difference: combination Figure 2a , Figure 2b As shown, the calibration system 200 further includes a handheld issuer 240, and the calibration module 216 is arranged in the handheld 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 externally located in the OBU 210 .

[0061] The handheld issuer 240 is generally used for OBU 210 initialization, primary issue or secondary issue, where...

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 in this embodiment is that the OBU310 belongs to a series of two-piece vehicle-mounted units with a card slot, and its internal structure includes a main control module 311 and is connected to the main control module 311 respectively. The transceiver module 312, the wake-up module 315 and the card reading module 317 are provided; the transceiver module 312 is provided with a signal strength value detection unit 3121. The calibration module 317 in this embodiment is also externally placed in the OBU 310 , but the external calibration module 317 is set in a calibration IC card 380 . like Figure 3a As shown, the calibration system 300 further includes a calibration IC card 380 connected to the OBU 310 , the calibration program instructions are set in the calibration IC car...

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Abstract

The invention relates to the application field of intelligent transportation, in particular to a sensitivity calibration system, a calibration method thereof, and a communication method of a vehicle-mounted unit. The sensitivity calibration system includes a calibration module for outputting calibration instructions; a standard signal source set outside the vehicle windshield for outputting a standard signal with a constant signal strength value; an on-board unit set inside the vehicle windshield, It is used to connect to the standard signal source after receiving the calibration instruction issued by the calibration module, and set the vehicle-mounted signal corresponding to the difference according to the difference between the standard signal strength value and the actual signal strength value. The threshold required for the unit to enter the communication state. The invention also provides a calibration method of the sensitivity calibration system and a communication method of the vehicle unit after calibration. The invention is applicable to the installation of different windshields by calibrating the vehicle-mounted unit, can adjust according to the attenuation degree of the signal by the windshield, and solves the problem of poor communication due to signal attenuation.

Description

technical field [0001] The invention relates to the application field of intelligent traffic, in particular to a system and a calibration method which can be used for sensitivity calibration of vehicle-mounted units. Background technique [0002] With the development of the automotive industry, automotive windshields with thermal insulation designs are becoming more and more popular on vehicles. This glass has metal ions added to the material and is transparent to visible light, but can absorb energy from other radiation spectrums such as infrared and ultraviolet. [0003] Vehicles fitted with such windshields may experience communication difficulties when passing through the ETC lanes. Since microwaves are greatly attenuated as they pass through this metal insulation or coated glass, the additional metal components absorb the microwave energy. In my country, the existing vehicle-mounted unit production standards generally stipulate that its wake-up sensitivity is ≤-40dBm,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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