Remote real-time time calibration method based on Beidou

Abstract

The invention discloses a Beidou-based remote real-time time calibration method. The method comprises the following steps: 1) a common-view receiver receives second pulse data sent by the same navigation satellite; 2) carrying out noise reduction processing on the second pulse data sequence received by the common-view receiver; 3) the local atomic clock and the common-view receiver respectively send pulses per second to a time interval counter, and the time interval counter calculates the time difference between the local time and the satellite time; 4) continuously tracking and processing the data output by the time interval counter by a data processing module of the time unification equipment; 5) the data processing module compiles the measurement result of each tracking epoch into a B code and sends the B code; and 6) demodulating the B code to obtain a 1PPS signal, and measuring the demodulated 1PPS signal by a time interval counter to obtain the time difference between the timing system equipment calibration instrument and the calibrated time equipment. According to the method, the common-view real-time performance is enhanced, and the defect that a tracking dead zone exists in traditional common view is overcome.

Description

technical field [0001] The invention relates to the technical field of time calibration, in particular to a remote real-time time calibration method. Background technique [0002] With the development of science and technology, high-precision time-frequency transmission plays an increasingly important role in the development of the national economy. In recent years, with the development of national defense and space technology, higher requirements have been placed on high-precision time and frequency transfer. The time synchronization of the SDH communication network, the detection and interception of air targets, require the time synchronization accuracy to reach the nanosecond level. In addition to the accuracy requirements, many applications also have requirements such as real-time synchronization of time. Because the GNSS common-view time transfer technology has the characteristics of cheap equipment, high timing accuracy, and convenient use, it has become an important...

AI Technical Summary

Problems solved by technology

[0010] However, the traditional GNSS common-view technology still has the following defects: First, the traditional common-view technology is mostly based on GPS outputting a measurement result every 16 minutes, which cannot meet the real-time requirements

A total of 3 minutes of tracking blind spots before and after lead to data waste

Second, the way of file interaction is not conducive to real-time data exchange

This mode of exchanging data after the event leads to a serious lag in the generation of comparison results, which does not meet the real-time requirements

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