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Local clock calibrating method and vehicle-mounted equipment

A technology of local clock and vehicle-mounted equipment, which is applied in the field of vehicle-mounted communication, can solve problems such as crystal oscillator frequency is easy to change, RTC clock lacks an automatic calibration mechanism, and accumulated errors, etc., to achieve the effect of ensuring accuracy

Active Publication Date: 2013-11-20
LAUNCH TECH CO LTD
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AI Technical Summary

Problems solved by technology

The crystal oscillator frequency of the RTC clock is prone to change due to factors such as product technology, ambient temperature, and matching capacitor accuracy, and the RTC clock lacks an automatic calibration mechanism, which makes the RTC clock prone to cumulative errors during years of use, resulting in on-board The device's system time is inaccurate

Method used

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  • Local clock calibrating method and vehicle-mounted equipment

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Embodiment Construction

[0012] The embodiment of the present invention provides a local clock calibration method and a vehicle-mounted device, which can provide accurate time for the vehicle-mounted device.

[0013] See figure 1 An embodiment of the local clock calibration method in the embodiment of the present invention includes:

[0014] 101. The vehicle-mounted equipment obtains GPS positioning information of the vehicle's global positioning system;

[0015] The Global Positioning System (GPS) can provide vehicles with real-time, all-weather and global navigation services. Most vehicles are equipped with GPS positioning systems. GPS is a new generation of satellite navigation, timing and positioning system developed by the United States in the 1970s. Each of the 24 dedicated GPS satellites has an atomic clock, which can carry the accurate Universal Time (UTC) in the GPS positioning information and send it to the vehicle-mounted device. Vehicle-mounted equipment can use GPS receivers to obtain GPS posi...

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Abstract

The embodiment of the invention discloses a local clock calibrating method and vehicle-mounted equipment. In the embodiment of the invention, the method comprises the following steps that the vehicle-mounted equipment acquires global positioning system (GPS) positioning information of a vehicle; the vehicle-mounted equipment resolves the GPS positioning information to obtain universal time coordinated (UTC) in the GPS positioning information; the vehicle-mounted equipment calibrates the local clock on the basis of the UTC in the GPS positioning information, wherein the local clock is a real-time clock (RTC). The embodiment of the invention further provides vehicle-mounted equipment. According to the embodiment of the invention, accurate time can be provided for the vehicle-mounted equipment.

Description

Technical field [0001] The embodiment of the present invention relates to the technical field of in-vehicle communication, in particular to a local clock calibration method and an in-vehicle device. Background technique [0002] Currently, in-vehicle devices mainly use Real-Time Clock (RTC) as a local clock to display system time. The crystal frequency of the RTC clock is prone to change due to factors such as product technology, ambient temperature, matching capacitance accuracy, etc., and the RTC clock lacks an automatic calibration mechanism, which makes the RTC clock prone to accumulate errors during the long-term use process, which may cause vehicle-mounted The system time of the device is not accurate. Summary of the invention [0003] The embodiment of the present invention provides a local clock calibration method and a vehicle-mounted device, which can provide accurate time for the vehicle-mounted device. [0004] The local clock calibration method provided by the embodim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04R20/04G04R40/06
Inventor 刘均孙宏伟
Owner LAUNCH TECH CO LTD
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