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Method for improving OBU radio frequency dynamic range, radio frequency front end and OBU

A dynamic range, RF front-end technology, applied in electrical components, transmission systems, instruments, etc., can solve the problems of RF indicators that do not meet actual applications, difficult to debug OBU, and difficult to adapt to multiple vehicle models and multiple application scenarios.

Active Publication Date: 2020-05-15
AEROSPACE INFORMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fact that some indicators only specify the maximum or minimum limit value of radio frequency parameters in the national standard, and the windshields of different models have different signal attenuation factors, the OBUs of various manufacturers still have radio frequency indicators in the actual application process. It does not meet the actual application situation, but because the integrated chip has been finalized, it is difficult to debug the OBU in the later stage
[0006] The existing OBU is difficult to adapt to various application scenarios of multiple models

Method used

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  • Method for improving OBU radio frequency dynamic range, radio frequency front end and OBU
  • Method for improving OBU radio frequency dynamic range, radio frequency front end and OBU
  • Method for improving OBU radio frequency dynamic range, radio frequency front end and OBU

Examples

Experimental program
Comparison scheme
Effect test

application example 1

[0074] This application example is mainly aimed at the problem that the OBU wake-up sensitivity is normal but the receiving sensitivity is too high in the actual application process of the ordinary vehicle OBU.

[0075] When the vehicle equipped with OBU drives to the ETC lane, after the OBU is awakened, the OBU will transmit and receive signals. Due to the current OBU chip on the market, there is a problem of high receiving sensitivity. At this time, the OBU will communicate with the ETC next to it. Lane for communication. It is easy to receive the information of the RSU of the adjacent ETC lane, causing the OBU to communicate with the adjacent ETC RSU.

[0076] Such as image 3 The illustrated application example mainly includes two radio frequency channels, radio frequency channel 3-1 and radio frequency channel 3-2. The radio frequency channel 3-1 includes: an antenna 1: 3-10 and a branch unit 1: 3-11. Among them, the gain of antenna 1: 3-10 is 1dB, and the polarization...

application example 2

[0080] This application example is mainly aimed at the problem that when the OBU is installed in a high-end vehicle, because the front windshield of the high-end vehicle has a large attenuation of the signal, it is difficult to wake up or the wake-up distance is too short after the vehicle drives to the ETC lane.

[0081] Such as Figure 4 As shown, in this embodiment, four radio frequency channels are included, namely: radio frequency channel 1: 4-1; radio frequency channel 2: 4-2; radio frequency channel 3: 4-3; radio frequency channel 4: 4-4. The first three RF channels, that is, RF channel 1: 4-1, RF channel 2: 4-2 and RF channel 3: 4-3, are used for the wake-up link of the OBU; the last RF channel, that is, RF channel 4: 4 -4, for the receive link and transmit link of the OBU.

[0082] The radio frequency channel 4-4 mainly includes: antenna 4: 4-40, branch unit 4: 4-41. Antenna 4: 4-40, the gain is 3dB, and the polarization mode is circular polarization antenna. Branc...

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Abstract

The invention discloses a method for improving a radio frequency dynamic range of an OBU, a radio frequency front end and the OBU. The method comprises the steps that a plurality of radio frequency channels are arranged, each radio frequency channel comprises an antenna and a branch unit, and the branch unit of at least one radio frequency channel is an attenuation unit; in the wait awakening stage, the first radio frequency channel combination is selected as a receiving channel; and after awakening, the second radio frequency channel combination is selected as a receiving channel, and the third radio frequency channel combination is selected as a transmitting channel. According to the invention, through the combination of different radio frequency channels, the radio frequency dynamic range of the OBU can be greatly improved, so as to adapt to various application scenes of various vehicle types.

Description

technical field [0001] The present application relates to the field of electronic non-stop charging, and more specifically, to a method for improving the dynamic range and adaptability of an OBU radio frequency, a radio frequency front end and an OBU. Background technique [0002] Electronic Toll Collection (ETC) is an intelligent transportation electronic system that realizes automatic toll collection without parking, based on modern communication technology, electronic technology, automatic control technology, computer and network technology. Through the dedicated short-range communication between the roadside unit (RSU) and the on-board unit (OBU) of the high-speed toll station, the system automatically completes the toll collection process without the need for drivers to stop and other toll personnel to operate. The ETC system can greatly improve efficiency. [0003] The OBU on the vehicle is usually in a state of low power consumption waiting to wake up. When the vehic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/401G07B15/06
CPCG07B15/063H04B1/401
Inventor 林磊
Owner AEROSPACE INFORMATION