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Production line calibration method, device and system of equipment clock, self-calibration method, and equipment

A technology of equipment clock and calibration method, which is applied to clocks, timing pulses, electronic timers, etc., can solve the problems of not being able to reach GPS, not being able to locate satellites, and large frequency deviation, and achieve the effect of eliminating frequency errors

Active Publication Date: 2020-04-14
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.

Method used

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  • Production line calibration method, device and system of equipment clock, self-calibration method, and equipment
  • Production line calibration method, device and system of equipment clock, self-calibration method, and equipment
  • Production line calibration method, device and system of equipment clock, self-calibration method, and equipment

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Embodiment Construction

[0034] 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 .

[0035] 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

The invention discloses a production line calibration method, device and system for an equipment clock, a self-calibration method, and equipment. The equipment comprises a TSXO and a Bluetooth module.The production line calibration method for the equipment clock comprises the steps: eliminating the built-in frequency offset of the TSXO through the Bluetooth module; and calibrating the temperaturedrift of the TSXO. Through the method, a low-cost and high-precision clock scheme with a positioning function can be provided for the universal connection equipment.

Description

technical field [0001] The present invention relates to the field of clock calibration of intelligent equipment, in particular to a production line calibration method, device and system, self-calibration method and equipment of equipment clocks. 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, computers, etc., generally have a mobile connectivity module (Connectivity) and a global positioning module (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 module (Wireless-Fidelity, WIFI for short). [0003] For the GPS module...

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Application Information

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IPC IPC(8): G04G3/04G04R20/02
CPCG04G3/04G04R20/02
Inventor 元恒敏
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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