Clock source device based on GPS second pulse and control method thereof

A control method and pulse-per-second technology, applied in the field of high-precision clock source devices, can solve problems such as cumulative error, large cumulative error, and high price

Inactive Publication Date: 2010-12-29
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the short-term stability of the crystal oscillator on the market is very high, but there is a large cumulative error after working for a long time
In addition, even if the same batch of crystal oscillators is produced by different crystal oscillators, there are certain differences among individuals, which will bring serious cumulative errors when used in high-precision instruments.
And high-precision crystal oscillators are expensive. For example, crystal oscillators with a stability of 0.035ppb (ppb is one billionth) cost more than 7,000 yuan, and there are also cumulative errors.

Method used

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  • Clock source device based on GPS second pulse and control method thereof
  • Clock source device based on GPS second pulse and control method thereof
  • Clock source device based on GPS second pulse and control method thereof

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Embodiment Construction

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] A clock source device based on GPS second pulse, such as figure 1 Shown: including GPS module, voltage-controlled crystal oscillator module, clock distribution chip, single-chip microcomputer module, single-chip microcomputer module includes A counter and B counter integrated in the single-chip microcomputer, a digital-to-analog converter DAC and an I / O interface; the clock distribution chip has two There are two clock channels, each with an input port and a control enable port; the clock output of the voltage-controlled crystal oscillator module can not only be connected to the device as the clock source of the device, but also connected to the input port of the two clock channels, the second channel The enabling terminal of the clock channel is grounded, and the output terminal is connected to the A counter of the single-chip...

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Abstract

The invention discloses a clock source device based on GPS second pulse and a control method thereof. A closed loop negative feedback control principle is adopted, and the output power of a voltage control x-tal crystal oscillator (VCXCO) is controlled at the nominal frequency thereof so as to satisfy the condition that multiple measuring systems can be used synchronously. Experiment results show that after the VCXCO is subjected to closed loop control, the cumulative errors can be controlled within a plurality of pulses.

Description

technical field [0001] The invention relates to a high-precision clock source device and a control method thereof which work for a long time without accumulative errors based on GPS second pulses. Background technique [0002] With the development of electronic technology, people have higher and higher requirements for the accuracy and synchronization of instrument measurement. Especially in the measurement of magnetotelluric or power system, it is often required that the instruments distributed in different areas can realize synchronous acquisition. , and the synchronization of sampling is guaranteed for a long time, which puts forward very high requirements on the stability of the clock system. Not only is the clock of each instrument required to be stable, but the clocks between the instruments must also be matched. At present, the short-term stability of the crystal oscillator on the market is very high, but there is a large cumulative error after working for a long tim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04G7/00G04G5/00G04R20/04
Inventor 杨建国赖淋香周旺
Owner XI AN JIAOTONG UNIV
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