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Non-differential and non-combination PPP method based on double constraints of ionized layer delay prior information and temporal and spatial variation information

An ionospheric delay, non-difference and non-combination technology, applied in the field of global satellite navigation and positioning, can solve the problems of ignoring the factors of time and space changes, restricting the convergence speed and positioning accuracy of non-difference and non-combination PPP, and improve the initial positioning accuracy and convergence The effects of speed, increasing time domain constraints, and improving modeling accuracy

Pending Publication Date: 2019-09-27
苏州时空复弦网络科技有限公司
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Problems solved by technology

Commonly used ionospheric models include the Klobuchar model and the Global Ionospheric Grid Product (GIM). The former can only provide about 50-60% of the ionospheric delay error correction effect, and the latter's nominal accuracy is only 2-8TECU, and, Because the ionosphere has the characteristics of time and space changes, the commonly used ionosphere correction model does not take into account the factors of time and space changes, which restricts the improvement of the convergence speed and positioning accuracy of non-difference and non-combined PPP

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  • Non-differential and non-combination PPP method based on double constraints of ionized layer delay prior information and temporal and spatial variation information
  • Non-differential and non-combination PPP method based on double constraints of ionized layer delay prior information and temporal and spatial variation information
  • Non-differential and non-combination PPP method based on double constraints of ionized layer delay prior information and temporal and spatial variation information

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[0034] The present invention is further elaborated below in conjunction with embodiment and accompanying drawing.

[0035]The present invention designs a non-difference and non-combined PPP positioning method based on the dual constraints of ionospheric delay prior correction information and time-space change information. By counting the spatial correlation and variability information of ionospheric VTEC, it is constructed based on Kriging method. The high-precision ionospheric VTEC grid provides the change information of the ionospheric spatial structure, obtains the high-precision ionospheric delay prior correction model, and at the same time increases the time-varying variance information of the ionospheric delay prior correction model error and the ionospheric delay time domain constraint, The IC-PPP model is established, which plays an important role in improving the initial positioning accuracy and convergence speed of IC-PPP.

[0036] Technical scheme of the present inv...

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Abstract

The invention provides a non-differential and non-combination PPP positioning method based on double constraints of ionized layer delay prior information and ionized layer spatial variation information. Based on an ionized layer space change structure, namely the statistics of ionized layer delay space correlation and variability information, an ionized layer grid with high precision and high resolution is obtained by adopting a Kriging space interpolation method, accurate ionized layer delay prior correction information is provided, meanwhile, proper time domain constraint information is added, non-differential and non-combined PPP (IC-PPP) positioning calculation is performed, and the problems of ionized layer delay correction precision in the non-differential and non-combined PPP and improvement of initial positioning precision domain and convergence speed are effectively solved.

Description

technical field [0001] The invention belongs to the technical field of global satellite navigation and positioning, and relates to a dual-frequency non-difference non-combined PPP (IC-PPP) positioning method based on ionospheric delay correction prior information and time-space change information double constraints. Background technique [0002] With the development of global satellite navigation and positioning system (GNSS), the precise point positioning (PPP) algorithm model is also being continuously optimized, making PPP technology more effective in high-precision dynamic positioning, high-precision integrated navigation, GNSS meteorology, crustal deformation monitoring, and earthquake disasters. It has been widely used in various fields such as forecasting and low-orbit satellite orbit determination. Among the error sources affecting PPP positioning, the ionosphere is an error source related to the signal rate, and the ionosphere is affected by the sun and the earth's ...

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Application Information

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IPC IPC(8): G01S19/44G01S19/07
CPCG01S19/44G01S19/07
Inventor 黄玲景贵飞
Owner 苏州时空复弦网络科技有限公司
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