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GNSS positioning method and device

A positioning method and equation technology, applied in the field of navigation and positioning, can solve problems such as affecting the PPP positioning effect, and achieve the effect of improving the iteration speed and positioning accuracy

Active Publication Date: 2022-07-12
BEIJING AEROSPACE HONGTU INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the accuracy of GIM in the vertical direction is about 2-8 TECU. The ionospheric delay accuracy obtained by GIM interpolation is equal to the accuracy of pseudorange observations. If the GIM weight is too large, it will affect the PPP positioning effect.

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Embodiment Construction

[0061] In order to make the purposes, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. The components of the embodiments of the present application generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

[0062] Thus, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application as claimed, but is merely representative of selected embodiments of the application. Based on the embodiments in this application, all other embodiments obtained by ...

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Abstract

The invention provides a GNSS positioning method and device, and relates to the technical field of navigation positioning, and the method specifically comprises the steps: obtaining observation data, ephemeris data, a global ionosphere grid diagram file, and a satellite DCB product; constructing a pseudo-range observation equation and a carrier phase observation equation based on observation data, ephemeris data and a satellite DCB product, and constructing an ionosphere virtual observation equation based on a global ionosphere grid diagram file; based on the observation data of the current epoch, determining an optimal weight which is a variance matrix between the ionosphere virtual observation value and the actual pseudo-range and carrier phase observation value; and based on a combined observation error equation formed by the pseudo-range observation equation, the carrier phase observation equation and the ionosphere virtual observation equation, calculating the position parameters of the receiver by using the optimal weight. According to the invention, the GNSS positioning solution iteration speed and the positioning precision are improved.

Description

technical field [0001] The present application relates to the technical field of navigation and positioning, and in particular, to a GNSS positioning method and device. Background technique [0002] As one of the specific services of satellite navigation, positioning technology has been widely used. Higher and higher requirements are also placed on the positioning accuracy. Among them, the non-difference and non-combination precision single point positioning (PPP) technology can not only obtain accurate ionospheric delay information, but also can accelerate the convergence of position parameters and improve the positioning accuracy by introducing external a priori ionospheric virtual observations as constraints. . [0003] At present, when introducing virtual observations of the external ionosphere for precise single-point positioning, a good positioning effect has not been obtained. The main reason is due to the fact that ex post PPP usually uses the Global Ionospheric G...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/43
CPCG01S19/43Y02A90/10
Inventor 黄雅琼王宇翔郭睿孙伟杰张龙平李晓杰辛洁谷世铭王铎
Owner BEIJING AEROSPACE HONGTU INFORMATION TECH