Vehicle-mounted unit antenna control system and control method thereof

Abstract

The invention discloses a vehicle-mounted unit antenna control system, which comprises antenna detection units, a radio frequency switch unit and a control unit, wherein the antenna detection units are used for detecting whether antennas work normally or not in real time, and are in one-to-one correspondence with the antennas; the radio frequency switch unit is used for controlling switching of different types of antenna paths; the control unit is used for receiving input signals of the antenna detection units and driving the radio frequency switch unit to control the antenna switching signaloutput sources according to control rules. The invention further discloses a vehicle-mounted unit antenna control method. Mutual backup among all vehicle-mounted unit antennas can be realized, normaluse of a communication function or a broadcast message under an important function system can be ensured to be executed according to a vehicle scene, and the reliability and the adaptability of an OBUfunction can be enhanced.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a vehicle-mounted unit antenna control system. The invention also relates to a method for controlling the antenna of the vehicle unit. Background technique [0002] The OBU (On board Unit) of the Internet of Vehicles usually supports many communication standards such as: 2G / 3G / 4G cellular network communication standard, Wi-Fi wireless LAN standard and the latest V2X (Vehicle-to-Everything cellular car connection) For the communication system, many antennas are used, including the built-in antenna. The built-in antenna and the external antenna (usually placed on the roof away from the OBU vehicle terminal) are placed inside the OBU PCB (Printed Circuit Board) for more important communication systems. [0003] Such as figure 1 As shown, the current vehicle-mounted OBUs (On board Units) all use 2G / 3G / 4G external antennas, and most OBUs (On board Units) use 2G / 3G / 4G main antennas to incr...

AI Technical Summary

Problems solved by technology

[0005] 1. In the existing technology, 2G / 3G / 4G signals can only be switched between the dedicated 2G / 3G / 4G external antenna and the 2G / 3G / 4G built-in backup antenna. If both the external antenna and the built-in backup antenna are damaged, it cannot Use the emergency communication function

[0006] 2. At present, V2X (Vehicle-to-Everything) antennas use external antennas, and there is no built-in backup or switching to other antennas for compatible use

In this way, in the scenario where the external antenna is damaged, the V2X (Vehicle-to-Everything Cellular Vehicle Linkage) broadcast signal cannot play a role, resulting in the possibility of two accidents or continuous collisions

[0007] 3. In the case that the dedicated V2X internal and external antennas are damaged, V2X has no backup antenna to use, and the cellular Internet of Vehicles function cannot be used

If some external antennas are damaged, the existing technology cannot use other standard external antennas to improve communication quality

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