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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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 ha

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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 will be further described below in conjunction with embodiments and drawings.

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

[0036] The technical scheme of the present invention m...

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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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