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Precision satellite ephemeris time reference stability assessment method and system based on PPP

A time-based, precise satellite technology, applied in the field of global navigation satellite systems, which can solve problems such as lack of evaluation technical means

Pending Publication Date: 2022-07-15
WUHAN UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is still a lack of effective evaluation techniques in this field

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  • Precision satellite ephemeris time reference stability assessment method and system based on PPP
  • Precision satellite ephemeris time reference stability assessment method and system based on PPP
  • Precision satellite ephemeris time reference stability assessment method and system based on PPP

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Embodiment Construction

[0049] The technical solutions of the present invention will be described below through embodiments in conjunction with the accompanying drawings.

[0050] In the embodiment of the present invention, the public observation data released by IGS and the public broadcast real-time PPP correction number are used, the PPP-based one-way timing and inter-station time synchronization are used, the frequency stability is characterized by the overlapping Allan variance, and the obtained overlapping Allan variance is calculated. Linear approximation, solve the linear equation system, and obtain the time reference stability of the real-time PPP product. By comparing the time reference stability of different products, it can provide a reference for product selection for the timing receiver, and improve the long-term stability of the time-frequency signal output by the timing receiver.

[0051] see figure 1 , the embodiment provides a PPP-based precision satellite ephemeris time reference ...

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Abstract

The invention provides a PPP-based precision satellite ephemeris time reference stability assessment method and system, and the method comprises the steps: carrying out the postmortem PPP processing of the observation data of an IGS observation station externally connected with an atomic clock group frequency source and real-time products of different analysis centers, and obtaining the observation station single-station time service results corresponding to the products of the different analysis centers; selecting one observation station as a central observation station, and carrying out inter-station time synchronization to obtain a time synchronization result; and calculating an overlapped Allan variance of single-station time service and inter-station time synchronization results, linearly combining Allan variance results, and separating product reference stability from PPP estimation noise stability. The method can be realized through data processing statistical analysis by only using a PPP technology, and hardware equipment is not needed; through the linear combination of the PPP technology and the Allan variance result, the time reference stability of the PPP product can be obtained, and a reference is provided for the selection of the PPP product of the time service receiver.

Description

technical field [0001] The invention belongs to the technical field of Global Navigation Satellite System (GNSS), in particular to a method and system for evaluating the stability of precision satellite ephemeris time reference based on precision point positioning technology (Precise Point Positioning, PPP). Background technique [0002] The Global Navigation Satellite System (GNSS) is a satellite-based radio positioning system, mainly including the US Global Positioning System (GPS), China's Beidou (BDS), Russia's GLONASS (GLONASS), and Europe's Galileo's four systems. In the field of timing, the use of GNSS receivers for timing has the characteristics of high precision, low cost and stability, and timing receivers will be more and more widely used in the field of timing. [0003] The GNSS timing receiver performs one-way timing, and its accuracy depends on the accuracy of the satellite ephemeris product. Using pseudo-range single-point positioning technology, combined wi...

Claims

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Application Information

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IPC IPC(8): G01S19/23
CPCG01S19/23
Inventor 辜声峰左鸿铭郭文飞龚晓鹏
Owner WUHAN UNIV