Medium-long baseline RTK positioning method based on single-difference ionized layer weighting model

A positioning method and ionospheric technology, applied in the field of satellite navigation and positioning, can solve the problems of reducing the performance of the ionospheric weighting model and improper weighting of observation values.

Pending Publication Date: 2020-04-17
SOUTHEAST UNIV
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Problems solved by technology

However, on the basis of the original GNSS observation equations, this observation is often improperly weighted, which degrades the performance of the ionospheric weighted model

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  • Medium-long baseline RTK positioning method based on single-difference ionized layer weighting model
  • Medium-long baseline RTK positioning method based on single-difference ionized layer weighting model
  • Medium-long baseline RTK positioning method based on single-difference ionized layer weighting model

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[0043] In order to make the objectives, technical solutions and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the embodiments and the accompanying drawings. Obviously, the specific embodiments described herein are only used to explain the present invention. , and is not intended to limit the present invention.

[0044] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and, unless defined as herein, are not to be taken in an idealized or overly formal sense. explain.

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Abstract

The invention discloses a medium-long baseline RTK positioning method based on a single-difference ionosphere weighting model, and the method comprises the following steps: selecting different calculation bases to calculate observation equations of an ionosphere floating point model, a fixed model and a weighting model under the condition that the rank of a GNSS observation equation is deficient,and obtaining a single-difference full-rank observation equation; adopting least square variance component estimation to obtain a correct random model GNSS observation value; analyzing the relationship between ionized layer observation values extracted by an ionized layer floating point model and a medium-long baseline by using the ionized layer observation values, and constructing a random model(single-difference ionized layer weighting model) of single-difference ionized layer observation values; and in medium -long baseline RTK positioning, the model is applied to quickly solve the integerambiguity, effectively increase the inter-station distance of RTK positioning, and improve the practicability and reliability of medium-long baseline RTK positioning.

Description

technical field [0001] The invention relates to a medium and long baseline RTK positioning method based on a single-difference ionospheric weighting model, and belongs to the technical field of satellite navigation and positioning. Background technique [0002] The integer ambiguity is the integer unknown corresponding to the first observed value in the GNSS carrier phase measurement. Determining it correctly is one of the very important and must be solved problems in GNSS carrier phase measurement. For short baselines of a few kilometers, it is easy to fix the ambiguity to an integer when the ionospheric fixation model is applied to this situation. For longer baselines greater than 10 km, the resolution of the integer ambiguity becomes difficult due to the large influence of the ionospheric delay on the single-difference observations. Correctly solving the ambiguity becomes a more challenging task as the baseline length increases. [0003] Ionospheric delay is one of the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/41G01S19/44
CPCG01S19/41G01S19/44
Inventor 吴向阳周诗洋
Owner SOUTHEAST UNIV
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