Calibration method, device and system for equipment clock, self-calibration method and device

A calibration method and equipment clock technology, applied in the direction of synchronization devices, measuring devices, radio wave measuring systems, etc., can solve the problems of not reaching GPS, difficult to solve, large frequency deviation, etc., achieve stable clock signal and eliminate temperature drift Interference, eliminate the effect of self-contained frequency offset

Active Publication Date: 2021-11-30
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology

Compared with VC-TCXO / TCXO, the cost of DCXO is lower, but since DCXO itself has no frequency adjustment mechanism, it needs to solve static and dynamic frequency errors. Static errors can generally be adjusted through the calibration process, but dynamic errors, that is, with temperature The changing frequency drift is difficult to solve, especially it is difficult to accurately obtain the real-time frequency deviation corresponding to the current temperature, which leads to the situation that the client device cannot locate the satellite due to the large frequency deviation at very high temperature, which cannot meet the requirements of GPS.

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  • Calibration method, device and system for equipment clock, self-calibration method and device
  • Calibration method, device and system for equipment clock, self-calibration method and device
  • Calibration method, device and system for equipment clock, self-calibration method and device

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Embodiment Construction

[0036] According to the background technology, the clock source of the existing GPS module is TCXO or DCXO, among which, the cost of TCXO is relatively high; and DCXO cannot solve the dynamic error caused by the frequency drift with the temperature change, thus making the positioning of the GPS module inaccurate .

[0037] To address the above problems, a Temperature Sensor Crystal Oscillator (TSXO) can be used to provide a clock for the device. The difference between a TSXO and an ordinary crystal oscillator (Crystal Oscillator) is that the TSXO contains a temperature sensor inside. The temperature sensor is a thermistor or Temperature diodes. At the same time, unlike TCXO, TSXO performs closed-loop feedback control on the output frequency. The output frequency of TSXO is not temperature compensated, which makes the frequency of TSXO output greatly affected by temperature. However, the clock corresponding to the crystal oscillator is required to be accurate as the reference c...

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Abstract

A method, device and system for calibrating an equipment clock, a self-calibrating method and equipment, the equipment includes a TSXO and a GPS module, and the GPS module includes a signal receiver; the method for calibrating the equipment clock includes: through the GPS module eliminating the self-contained frequency offset of the TSXO; and calibrating the temperature drift of the TSXO. Through this method, a low-cost and high-precision clock solution with a built-in positioning function can be provided for ubiquitous connected devices.

Description

technical field [0001] The present invention relates to the field of clock calibration of smart devices, in particular to a device clock calibration method, device and system, self-calibration method and equipment. Background technique [0002] In today's society, mobile phone products and Internet of Things technology are developing vigorously, and the development of Internet of Things is inseparable from intelligent positioning technology. At present, Global Positioning System (GPS) modules are mostly used for intelligent positioning. Pan-connected devices for mobile communications, such as mobile phones, computers, etc., generally have their own mobile connectivity modules (Connectivity) and GPS modules. Wherein, the mobile connection module may include a Bluetooth module (BlueTooth, BT for short) or a wireless network connection module (Wireless-Fidelity, Wi-Fi for short). [0003] For the GPS module, there are generally two clock sources: one is that it has a temperatu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G04R20/04G04R40/06G01S19/23G01S19/25H04W56/00
CPCG01S19/23G01S19/256G04R20/04G04R40/06H04W56/0035
Inventor 元恒敏
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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