Shark fin vehicle-mounted antenna integrated with Beidou free flow terminal

Abstract

The embodiment of the invention discloses a shark fin vehicle-mounted antenna integrated with a Beidou free flow terminal, which comprises a bottom plate and a shark fin-shaped shell, wherein a circuit board consistent with the bottom surface of the shell in shape is arranged on the bottom plate, the circuit board is connected and grounded with a vehicle roof through the bottom plate, and the Beidou free flow terminal is integrated on the circuit board. The Beidou free flow terminal comprises a positioning antenna adopting a high-precision multi-point feed stacking design, and the positioning antenna is arranged at the rear end of the circuit board. The Beidou free flow terminal is integrated in the shark fin antenna on the roof, the installation position of the antenna is not easy to limit, and the performance of each antenna can be greatly improved, thereby improving the positioning precision and communication distance of the Beidou free flow terminal.

Description

technical field [0001] The invention relates to the technical field of automotive electronics, in particular to a shark-fin vehicle-mounted antenna integrated with a Beidou free-flow terminal. Background technique [0002] At present, my country's highways mainly use two toll methods: semi-automatic lane toll collection system (MTC) and electronic non-stop toll collection system (ETC). In order to accelerate the construction of a new generation of national traffic control network and smart expressway, the Beidou-based highway free-flow toll model has been carrying out pilot tests. [0003] Highway free flow toll based on Beidou refers to the use of Beidou satellite navigation system to locate vehicles, combined with high-precision positioning technology to draw the vehicle's driving trajectory on the expressway, calculate the expressway mileage rate through the trajectory, and collect fees through the mobile Internet. Higher efficiency and more accurate charging. [0004] ...

AI Technical Summary

Problems solved by technology

[0007] 1. The positioning antenna does not adopt the high-precision design of multi-point feed, and the phase accuracy is insufficient;

[0008] 2. When installed on the window glass, the tilt of the window glass of some models is too large, and the performance of the positioning antenna decreases;

[0009] 3. If there is a metal film on the window glass, the signal will be completely blocked;

[0010] 4. Limited by the size of the free-flow terminal, the size of the positioning antenna is limited, and there is no large-area reflector, and the gain is poor, which may easily lead to slow satellite search and poor signal-to-noise ratio;

[0011] 5. Limited by the size of the free-flow terminal, the size of the Bluetooth antenna is limited, and the gain is poor, which easily leads to a short receiving distance of the Bluetooth signal;

[0012] 6. Limited by the size of the free-flow terminal, the size of the LTE communication antenna is limited, and it is blocked by the main board, and the gain is poor, which easily leads to short communication receiving distance and poor signal;

[0013] 7. Some free streaming terminals need to add WiFi hotspots. Due to the size limitation of free streaming terminals, the size of WiFi antenna is limited, and it is blocked by the main board, and the gain is poor, which may easily lead to small coverage of WiFi hotspots;

[0014] 8. In some requirements, an ETC antenna needs to be added to the free flow terminal. Due to the limitation of the size of the free flow terminal, only a single-unit ETC antenna can be used, which is blocked by the main board and has poor gain, which easily leads to a short receiving distance of the ETC signal.

[0015] 9. To sum up, due to the limitation of free-flow terminal size and installation angle, the current mainstream free-flow terminal has insufficient positioning accuracy, and the signal is poor due to the poor gain of Bluetooth, LTE, WiFi antenna and ETC antenna

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