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Adjustable-precision time acquisition method based on second pulses

An acquisition method and pulse-per-second technology, which is applied in time-division multiplexing systems, electrical components, multiplexing communications, etc., can solve the problems of inability to adjust accuracy, inconvenient function upgrade and expansion of timing equipment, and inability to flexibly adjust clock accuracy, etc. question

Active Publication Date: 2019-04-12
XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA
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AI Technical Summary

Problems solved by technology

However, this technology has the problem of being unable to flexibly adjust the precision of the clock below the second
In this technology, FPGA designers set a fixed clock accuracy of less than one second according to the actual use requirements of the timing equipment, and the accuracy cannot be adjusted during use.
When the time service equipment needs to use higher precision time due to changes in requirements, FPGA designers need to redesign the logic circuit according to the new requirements, which brings great inconvenience to the upgrade and expansion of the time service equipment functions

Method used

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  • Adjustable-precision time acquisition method based on second pulses
  • Adjustable-precision time acquisition method based on second pulses

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Embodiment Construction

[0016] The basic principle of the adjustable-accuracy time acquisition method based on the second pulse of the present invention is: the local crystal oscillator provides a clock signal for generating high-precision time, the PPC processor controls the initialization time information and determines the time accuracy, and the FPGA uses the PPS signal to correct the time error.

[0017] figure 1 An architecture diagram showing the method of the present invention. Such as figure 1 As shown, the PPC processor receives the UTC time information sent by the GPS receiver, and obtains the hour, minute, and second data synchronized with the GPS after solving the UTC time information; the PPC processor generates precision information, and obtains The hour, minute, second and second data and accuracy information are transmitted to the FPGA clock acquisition unit; the FPGA clock acquisition unit receives the local clock signal from the local clock source and the PPS signal from the GPS re...

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Abstract

The invention provides an adjustable-precision time acquisition method based on second pulses. The method includes: receiving UTC time information, which is issued by a GPS receiver, by a PPC processor, and obtaining hour, minute and second data, which are synchronized with a GPS, after solution calculation; generating precision information by the PPC processor, and passing the hour, minute, second and less-than-second data obtained after solution calculation and the precision information to an FPGA clock acquisition unit; receiving a local clock signal from a local clock source by the FPGA clock acquisition unit, receiving a PPS signal from the GPS receiver, and calibrating the received hour, minute, second and less-than-second data; and sending back the calibrated hour, minute, second and less-than-second data to the PPC processor by the FPGA clock acquisition unit through an LBC bus to realize calibration of less-than-second data. According to the method, time precision configuringis flexible, and time acquisition precision is high.

Description

technical field [0001] The invention relates to the technical field of clock synchronization of aviation equipment systems, in particular to a method for acquiring time with adjustable precision based on second pulses. Background technique [0002] System time synchronization between aviation airborne equipment is particularly important, and system time synchronization is the basis for ensuring normal communication and collaborative work between equipment. In the whole system, the device terminal can obtain a high-precision clock by receiving GPS signals or B codes, and use this clock as a reference to serve time to other devices. Although the accuracy of the UTC time frame output by the terminal in RS422 format can reach 1us or even higher, due to the serial-to-parallel conversion delay inside the terminal, the transmission delay of the data line, and the serial-to-parallel conversion delay of the time-service device, the time-service device can obtain The UTC time is not ...

Claims

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Application Information

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IPC IPC(8): H04J3/06H04J3/16
CPCH04J3/0644H04J3/0658H04J3/1676
Inventor 冯毅陈颖图张曼高群立郭晓光付洁
Owner XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA
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