Backward diode/global positioning system (BD/GPS) dual-mode time service-based time synchronization device

A time synchronization device, time interval measurement technology, applied in the direction of synchronization, clocks driven by synchronous motors, electronic timers, etc., can solve the problems of complex hardware system structure, complex program structure, system instability, etc., to improve reliability. , Improve the effect of stability and reliability improvement

Inactive Publication Date: 2012-02-01
XI AN JIAOTONG UNIV +2
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Problems solved by technology

The above-mentioned research results all mentioned a method based on Beidou/GPS dual-mode timing technology (such as figure 1 ), but this method uses GPS and BD receivers respectively, the hardw

Method used

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  • Backward diode/global positioning system (BD/GPS) dual-mode time service-based time synchronization device
  • Backward diode/global positioning system (BD/GPS) dual-mode time service-based time synchronization device

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Embodiment Construction

[0011] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0012] Such as figure 1 As shown, in the time synchronization device of BD / GPS dual-mode time service, the rubidium clock of X72 outputs a sine wave with a frequency of 10MHz. After processing with an AND gate, a 10MHz square wave can be obtained, and the square wave is divided by CPLD Output a second pulse (1pps) after the frequency.

[0013] The 1pps output by the BD / GPS dual-mode receiver will be used as the reference time for adjusting the rubidium clock time. Input the 1pps and the 1pps after CPLD frequency division into the time interval measuring instrument, and the time difference between the two second pulses can be measured, thereby measuring the drift speed and drift amount of the rubidium clock relative to the time reference, and then the difference The value signal is input into the digital signal processor DSP, which w...

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Abstract

The invention discloses a backward diode/global positioning system (BD/GPS) dual-mode time service-based time synchronization device. In the device, a frequency output pin of a rubidium clock X72 is connected with an input pin of an AND gate; an output pin of the AND gate is connected with an input pin of a complex programmable logic device (CPLD); an output end of a top dead center-general purpose 2 (TDC-GP2) chip of a time interval measuring instrument is connected with a digital signal processor (DSP) through a single program initiation (SPI) port; the DSP is connected with the rubidium clock through an RS232 serial port; an output end of a 1pps signal output by a BD/GPS dual-mode receiver is connected with the TDC-GP2 chip of the time interval measuring instrument; and an RS 232 port of the BD/GPS dual-mode receiver is connected with the DSP. The device has a simple structure and high stability and can adapt to a switchover time service mode; and the cost of the device is reduced, a system structure is simplified and the stability of the device is enhanced without accuracy loss.

Description

technical field [0001] The invention relates to a time synchronization device, in particular to a time synchronization device based on BD / GPS dual-mode time service. Background technique [0002] Time is the basic parameter of physics and the basic form of material existence. The measurement of time and the transmission and application of time information are crucial to our life, the development of the national economy, and especially the construction of national defense. And time synchronization is to make the time in various places have the same time measurement value at the same moment. With the rapid development of social productivity and science and technology, the application of time synchronization is becoming more and more extensive, and some specific fields have higher and higher requirements for time synchronization accuracy of timing systems. For example, in the fields of rocket launch, satellite tracking, oceanographic survey, geodetic survey, aircraft and ship ...

Claims

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Application Information

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IPC IPC(8): G04G7/00
Inventor 孙剑张志雄李斌付金厚
Owner XI AN JIAOTONG UNIV
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