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Method for improving GNSS synchronous time service precision

A precision and coarse synchronization technology, applied in the field of timing system and satellite navigation system, can solve the problems of not being able to meet the timing requirements of the timing system, and the accuracy can only meet the technical indicators given by the receiver, so as to improve the timing stability and hardware cost The effect of increasing low and improving timing accuracy

Active Publication Date: 2020-08-25
成都七维频控科技有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0005] The present invention provides a method for improving the precision of GNSS synchronous timing service to solve the problem that the existing 1PPS signal output by the GNSS receiver is directly used as the punctual signal of the second signal, and its precision can only reach the technical index given by the receiver, and cannot adapt to higher The problem of the timing requirements of the precision timing system

Method used

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  • Method for improving GNSS synchronous time service precision
  • Method for improving GNSS synchronous time service precision

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as figure 1 As shown, a method for improving GNSS synchronous timing accuracy comprises the steps:

[0037] Step 1. Use the GNSS antenna to receive the radio signal of GNSS satellite navigation;

[0038] Step 2. After the radio signal is amplified and filtered, it is sent to the GNSS receiver for demodulation processing;

[0039]Step 3. After the demodulation process, the GNSS receiver outputs two-way signals, and one-way signal output navigation positioning and timing information to the CPU acquisition processing unit, and the CPU acquisition processing unit reads the timing information and the state information received by the satellite, thereby Determine the working status of the system; another signal outputs 1PPS_SAT timing second pulse to the TIE measurement unit;

[0040] Step 4. Use the local crystal oscillator to output a 10MHz signal. The 10MHz signal is divided into two channels, one of which enters the frequency division unit, and the frequency divisi...

Embodiment 2

[0056] Perform smoothing filter processing on 1PPS_SAT, the process is as follows:

[0057] First establish a local high stable frequency source, the frequency source includes the CPU acquisition processing unit, the digital-to-analog converter unit, the rough synchronization unit, the frequency division unit, the local crystal oscillator and the The TIE measurement unit, the local crystal oscillator is a high-voltage-controlled crystal oscillator, and the frequency source can improve the frequency accuracy of the local crystal oscillator to 5E-11, and the frequency division unit is effective for the local The 10MHz signal output by the crystal oscillator is divided by 10000000 to generate a high-precision, high-stability 1PPS_LOCAL signal, which is used as a reference signal for the smoothing and filtering measurement of the 1PPS_SAT signal.

[0058] The frequency division algorithm of the local crystal oscillator output 10MHz signal is as follows:

[0059]

Embodiment 3

[0061] Such as image 3 As shown, the process of the TIE measuring unit measuring the time interval of 1PPS_SAT and 1PPS_LOCAL is as follows:

[0062] The frequency division unit multiplies the 10MHz signal to 200MHz through its internal phase-locked loop, and uses it as a filling pulse for time interval measurement. The rising edge of 1PPS_SAT is used as the opening signal to start the counter to count 200MHz, and 1PPS_LOCAL is used as the closing signal to stop counting , the count value multiplied by 5 is the time difference between the rising edges of the two pulses of 1PPS_SAT and 1PPS_LOCAL. The time difference is read by the CPU acquisition processing unit from the TIE measurement unit through the second communication bus, and is accumulated and calculated, outliers are eliminated, and an average value is calculated every 100 seconds.

[0063] The TIE measurement unit measurement algorithm is as follows:

[0064]

[0065]

[0066]

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Abstract

The invention provides a method for improving GNSS synchronous time service precision. The method comprises the following steps: 1, a GNSS antenna receiving a radio signal of GNSS satellite navigation; 2, amplifying and filtering the radio signal, and transmitting the radio signal to a GNSS receiver for demodulation; 3, after demodulation processing, the GNSS receiver outputting two paths of signals; 4, the local crystal oscillator outputting a 10MHz signal, and dividing the 10MHz signal into two paths; 5, the TIE measurement unit measuring pulse rising edge time intervals of the 1PPS_LOCAL and the 1PPS_SAT; 6, the CPU acquisition and processing unit transmitting the control quantity signal to a digital-to-analog converter unit; 7, converting the control quantity signal into an analog voltage-controlled voltage by the digital-to-analog converter unit; 8, the CPU acquisition and processing unit controlling the fine synchronization unit to perform fine synchronization; and 9, the CPU acquisition processing unit controlling the fine synchronization unit to output a high-precision pulse per second synchronization signal. According to the invention, the problems that the jitter is large, the precision can only reach dozens of nanoseconds, and the time service requirement of a time service system with higher precision cannot be met due to the fact that the 1PPS signal output by the GNSS receiver is directly used as the punctuality signal of the second signal are solved.

Description

technical field [0001] The invention relates to the technical field of satellite navigation systems and timing systems, and more particularly to a method for improving the precision of GNSS synchronous timing. Background technique [0002] In a series of communication activities, the measurement data and events acquired and recorded by each measurement and control station must have a strict and unified same time standard before they can be analyzed and processed to be of value. In the time unified system, time transfer usually includes satellite timing, network timing, and IRIG-B timing, all of which rely on a stable and accurate 1PPS second signal. [0003] At present, there are mainly two ways to provide the time reference second signal of the same time system: one is to maintain a high-precision second time reference through a dedicated watch clock, but the cost is very high due to the need for expensive atomic clock groups; the other is to use low The low-cost GNSS sate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04R20/04G04G7/00
CPCG04G7/00G04R20/04
Inventor 崔保健周德海张占国
Owner 成都七维频控科技有限公司
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