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

A technology of equipment clock and calibration method, applied in the directions of synchronization devices, measurement devices, radio wave measurement systems, etc., can solve the problems of difficult to accurately obtain real-time frequency offset, unable to locate satellites, unable to reach GPS, etc., and achieve precise positioning. , to achieve positioning, to eliminate the effect of its own frequency offset

Active Publication Date: 2022-02-25
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

[0033] 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 .

[0034] 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 device clock calibration method, device and system, self-calibration method and device, the device includes a TSXO and a WIFI module, the device clock calibration method includes: eliminating the self-contained frequency offset of the TSXO through the WIFI module ; Calibrate 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) is mostly used for intelligent positioning. Pan-connected devices for mobile communications, such as mobile phones and computers, generally have their own mobile connectivity modules (Connectivity) and global positioning modules (Global Positioning System, GPS for short). Wherein, the mobile connection module may include a Bluetooth module (BlueTooth, BT for short) or a wireless network connection (Wireless-Fidelity, WIFI for short) module. [0003] For the GPS module, there are generally two ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G04R20/04G04R40/06G01S19/23G01S19/25H04W56/00
CPCG04R20/04G04R40/06G01S19/23G01S19/256H04W56/0035
Inventor 元恒敏
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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