Apparatus for time synchronizing based on common view of multiple satellites and filtering and method thereof

A time synchronization and common viewing technology, applied in the field of satellite navigation, can solve the problems of being vulnerable to damage, vulnerable to high mountains, blocked by tall buildings, and unusable

Active Publication Date: 2015-11-11
交信北斗(浙江)科技有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, GNSS one-way time synchronization is restricted by various factors such as ionospheric delay, tropospheric delay, satellite ephemeris, clock difference, etc., the time synchronization accuracy is about 20-30ns, and the synchronization accuracy is poor, which cannot be used in real systems; The common view time synchronization method only realizes time synchronization between stations by observing one satellite at the same time. Since the signal propagation paths of the same satellite observed by two stations are not exactly the same, the time synchronization accuracy between

Method used

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  • Apparatus for time synchronizing based on common view of multiple satellites and filtering and method thereof
  • Apparatus for time synchronizing based on common view of multiple satellites and filtering and method thereof
  • Apparatus for time synchronizing based on common view of multiple satellites and filtering and method thereof

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Embodiment 1

[0060] A time synchronization device based on multi-satellite common viewing and α-β filtering, such as figure 1 As shown, it includes: a connected time synchronization module installed in two pseudolite stations; the time synchronization module includes: a multi-channel receiver module, a communication module, an information processing and clock correction module, wherein the multi-channel receiver module communicates with the The satellite is connected, and the multi-channel receiver module is connected to the communication module through the information processing and clock correction module; the two time synchronization modules are connected through their respective communication modules;

[0061] Among them, the multi-channel receiver is responsible for the extraction of the pseudo-range of the current observation satellite and the calculation of the message, the information processing and clock correction module is responsible for the accurate estimation of the clock diff...

Embodiment 2

[0064] A time synchronization method based on multi-satellite common view and α-β filtering, such as figure 2 shown, including:

[0065] Step 1. Use the multi-channel receivers of the two pseudolite stations A and B to capture, track and measure the navigation satellites observed respectively, and obtain the position of the measured satellite and the pseudolite positions relative to the pseudolite stations A and B. distance, and calculate the relative clock error of the pseudolite station;

[0066] By observing the locations of the two pseudolites respectively, the observations of pseudolite stations A and B at the same time t are obtained: the satellite position of satellite i at time t and pseudoranges and

[0067] Assume that the clock errors observed by pseudolite stations A and B through satellite i at time t are respectively δt iA and δt iB , by correcting the errors and delays of the pseudo-range observations, the clock errors of the two pseudolite stations A ...

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Abstract

The invention belongs to the technical field of satellite navigation, and in particular relates to an apparatus for time synchronizing based on multi-satellite common view and a [alpha]-[beta] filtering and a method thereof. The apparatus includes connected time synchronous modules which are mounted inside two pseudo satellites, wherein the time synchronous module includes: a multi-channel receiver module, a communication module, an information processing and clock correcting module. The method includes: through collection data of the two pseudo satellites, obtaining the position of the satellite tested and pseudo ranges with respect to the pseudo satellites A and B, obtaining an elevation angle of the satellite through calculation, and conducting weighting and averaging with the sine value of the elevation angle as the weight, conducting the [alpha]-[beta] filtering in combination with the mathematical model for clock error, further correcting clock errors, eventually obtaining a more accurate clock error estimation value, correcting the clock error of the pseudo satellite which needs synchronization based on the clock error estimation value, and at last achieving the time synchronization between the two pseudo satellites. The embodiments of the invention can eliminate random error in observed quantity, increase precision of time synchronization, and have a stronger ability than single channel common-view time synchronization method in terms of anti-interference.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation, and in particular relates to a time synchronization device and method based on multi-satellite common viewing and α-β filtering. Background technique [0002] At present, the world's navigation satellite systems mainly include the GPS of the United States, the GLONASS of Russia, the GALILEO system under construction of the European Union, and the BD-2 satellite navigation system of our country. In addition, different departments and organizations in many countries and regions have also established their own satellite-based augmentation systems (SBAS), typically including EGNOS, OmniSTAR, QZSS systems, etc. It is foreseeable that the future will be a multi-system integration Global Navigation Satellite System (GNSS )era. However, the accuracy, reliability and availability of various global navigation satellite systems depend to a certain extent on the number and geometric distributio...

Claims

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Application Information

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IPC IPC(8): G01S19/40
CPCG01S19/40
Inventor 于渊沈兵李晶刘建卢红洋
Owner 交信北斗(浙江)科技有限公司
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