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Active phased array vehicle-mounted antenna system suitable for high-speed rail

A vehicle-mounted antenna and active antenna technology, applied in the field of communication, can solve the problems affecting the coverage effect of the EUHT communication system, reducing the transmission power of the system, and blackening under the tower, so as to enhance the anti-interference ability and driving ability, reduce power consumption and system cost. , the effect of reducing the number of phase shifters

Pending Publication Date: 2021-01-15
BEIJING NUFRONT MOBILE MULTIMEDIA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the distance between the train and the base station antenna is farthest, the spatial path loss is the largest, and the main lobe of the passive vehicle antenna points to the base station antenna, which can meet the long-distance coverage scenarios; The beam direction of the passive antenna is fixed. At this time, it is in the coverage area of ​​the side lobe of the vehicle antenna and the base station antenna. The signal is weak and prone to blackouts under the tower
[0003] In addition, because the vehicle-mounted antenna is installed on the top of the train and the vehicle-mounted equipment is installed in the cabinet in the compartment, a long RF feeder is required to connect the antenna and the vehicle-mounted equipment, resulting in large line loss, reducing the system’s transmission power, and increasing the system’s noise factor. , affecting the coverage effect of the EUHT communication system

Method used

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  • Active phased array vehicle-mounted antenna system suitable for high-speed rail
  • Active phased array vehicle-mounted antenna system suitable for high-speed rail
  • Active phased array vehicle-mounted antenna system suitable for high-speed rail

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Experimental program
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Effect test

Embodiment 1

[0065] In the embodiment, the vehicle-mounted antenna is 2×2 MIMO, and the front and rear directional antennas are ±45° dual-polarized antennas as an example to illustrate the implementation of the vehicle-mounted antenna;

[0066] The vehicle-mounted antenna includes a pair of ±45° dual-polarized directional antennas; the two polarization directions of +45° and -45° are orthogonal to each other, and the beam directions basically coincide. The antenna also exhibits a certain beam width; two directional antennas are arranged in a back-to-back manner, and the main beam of the forward antenna includes a +45-degree polarized beam and a -45-degree polarized beam, pointing in the same direction as the front of the car, and the rear direction The antenna main beam also contains a +45° polarized beam and a -45° polarized beam, pointing in opposite directions.

[0067] Exemplarily, in this embodiment, an antenna array of 3 rows and 2 columns is used to realize a directional antenna wit...

Embodiment 2

[0084] The present invention provides a vehicle-mounted device, which is used for the vehicle-mounted device to control and adjust the pitch angle of the active phased array vehicle-mounted antenna, so that the main lobe of the vehicle-mounted antenna points to the direction of the base station antenna in real time;

[0085] Pre-set the one-to-one correspondence between the vehicle antenna pitch angle command and the vehicle antenna pitch angle; the vehicle device sends the pitch angle command to the vehicle antenna through the serial port, and after the vehicle antenna receives the pitch angle command, it corresponds to the preset pitch angle command and the pitch angle. relationship, adjust the phase value of the TR unit inside each antenna, and control the vehicle antenna to point to the corresponding angle.

[0086] Specifically, the on-board equipment includes:

[0087] A power module 21, a vehicle-mounted device controller 22, a first radio frequency transceiver 23, and ...

Embodiment 3

[0128] This embodiment illustrates the open-loop power control mode of the active phased array vehicle-mounted antenna system;

[0129] Open-loop power control is realized based on the principle of uplink and downlink channel reciprocity. From the perspective of vehicle equipment, the uplink and downlink channel reciprocity of the active antenna and the passive antenna are different, and the receiving and transmitting gains of the passive antenna are the same. The uplink channel reciprocity condition; while the transceiver gain of the TR unit of the active antenna is different, from the perspective of the vehicle equipment, the uplink and downlink channels are no longer reciprocal, so the open-loop power control algorithm of the active antenna is different from that of the passive antenna. According to the proof, the open-loop power control of active antenna can be corrected and realized on the basis of the open-loop power control algorithm of passive antenna.

[0130] In the ...

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Abstract

The invention provides an active phased-array vehicle-mounted antenna system suitable for a high-speed rail. The active phased-array vehicle-mounted antenna system comprises an active phased-array vehicle-mounted antenna and vehicle-mounted equipment, wherein the vehicle-mounted equipment controls and adjusts the pitching angle of the active phased array vehicle-mounted antenna, so that the main lobe of the vehicle-mounted antenna points to the direction of the base station antenna in real time, and the active phased array vehicle-mounted antenna can improve the transmitting power of the system, improve the receiving sensitivity and enhance the signal intensity along the line.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to an active phased array vehicle-mounted antenna system suitable for high-speed rail. Background technique [0002] Enhanced ultra-high throughput EUHT (Enhanced Ultra High Throughput), is a wireless high-speed communication technology developed by Nufront Company and has completely independent intellectual property rights. In the EUHT high-speed rail communication system, the base station equipment is erected on the communication tower along the railway , the vehicle-mounted antenna is installed on the top of the train, and the wireless signal forms a band-like coverage along the railway. In order to improve the coverage distance, the EUHT high-speed rail vehicle antenna adopts two high-gain directional antennas at the front and rear. When the distance between the train and the base station antenna is farthest, the spatial path loss is the largest, and the main lobe of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/32H01Q1/50H01Q3/36H01Q21/00H01Q21/06H01Q21/24H01Q21/29
CPCH01Q21/29H01Q21/0006H01Q21/061H01Q3/36H01Q21/24H01Q1/50H01Q1/3225
Inventor 郑高伟楼旭东杨利鲍东山
Owner BEIJING NUFRONT MOBILE MULTIMEDIA TECH
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