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Beidou IGSO/MEO satellite pseudo-range code deviation one-step modeling method

A satellite pseudo-range and Beidou technology, which is applied in the field of positioning and orbit determination ambiguity fixation, Beidou IGSO/MEO satellite pseudo-range code deviation one-step modeling method, can solve the problems of precise single-point positioning non-difference ambiguity difficult to fix quickly and effectively , to achieve the effects of reducing convergence time, eliminating ambiguity parameters, and improving reliability

Active Publication Date: 2018-01-05
WUHAN UNIV
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Problems solved by technology

[0009] Aiming at the problem that the Beidou system's long-distance double-difference ambiguity and precise single-point positioning non-difference ambiguity are difficult to fix quickly and effectively, the present invention proposes a one-step modeling of Beidou IGSO / MEO satellite pseudorange code deviation that can quickly and effectively fix the ambiguity Law

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with specific embodiments, see Figure 5 , the present invention includes two parts of modeling and gross error elimination.

[0048] The specific steps of the modeling part are as follows:

[0049] Step 1. For the designated station of a single Beidou IGSO / MEO satellite, the normal equation is superimposed according to the observation data of the designated station.

[0050] This step further includes:

[0051] Step 1.1, using the IGS precise satellite orbit, precise satellite clock difference products and observation data of the designated station, using the Precise Point positioning (PPP) method to solve the coordinates of the designated station.

[0052] Step 1.2: Perform cycle slip detection on the observation data of the specified station, if the current epoch is the first epoch or the phase observation value of the current epoch has a cycle slip, set the current epoch as the reference epoch t ...

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Abstract

The present invention discloses a Beidou IGSO / MEO satellite pseudo-range code deviation one-step modeling method. An original phase observed value is subjected to cycle slip detection to determine whether a phase observed value in each frequency at a current epoch is set as a reference epoch or not, pseudo-range code deviation of a receiver is neglected based on an MP (Multi-Path) combination observed value, and each observation station MP combination observed value of each epoch is subjected to weighing according to a satellite elevation and then reference epochs with the same arc section aresubtracted from each observation station MP combination observed value of each epoch to accurately eliminate unknown integer ambiguity parameters so that the pseudo-range code deviation of a single satellite in each frequency is added into a same method equation to comprehensively solve a three-order polynomial correction model coefficient, the pseudo-range code deviation related to an elevatingangle of each satellite in each frequency is accurately corrected to an extreme, stability of a code-phase combination observed value of the Beidou satellite is improved, and the Beidou IGSO / MEO satellite pseudo-range code deviation one-step modeling method has an important meaning for shortening fuzziness convergence time.

Description

technical field [0001] The invention belongs to the technology for fixing ambiguities in positioning and orbit determination in the field of global navigation systems, and in particular relates to a one-step modeling method for Beidou IGSO / MEO satellite pseudorange code deviations. Background technique [0002] The convergence time of ambiguity is a hot and difficult issue in the research of satellite navigation positioning and orbit determination technology. There are systematic deviations in the pseudorange code observations of Beidou system IGSO / MEO satellites, see figure 1 , affecting the convergence speed and reliability of the carrier phase ambiguity solution. Scholars such as Andre'Hauschild, Oliver Montenbruck and others have proposed that the code-phase combination observations of the Beidou IGSO / MEO satellite have systematic errors related to the altitude angle [1-2] . [0003] In addition, Scholars Lambert Wanninger analyzed the MP (Multi-Path) combined observa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/44
Inventor 邹璇李宗楠冯瑾陈亮李敏唐卫明施闯
Owner WUHAN UNIV
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