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Unequal measurement variance-based long base-line three-frequency ambiguity dissolving method

A technology with ambiguity and long baseline, which can be used in measurement devices, radio wave measurement systems, satellite radio beacon positioning systems, etc., and can solve problems such as different pseudorange noises

Active Publication Date: 2019-11-12
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

At present, when calculating the combined noise, it is generally assumed that the pseudo-range noise on the three frequency points is the same, but in the actual environment, because the code ring parameters, front-end bandwidth, and multipath effects of the receiver at different frequency points are not the same, the three frequency points The pseudorange noise of the points is significantly different

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  • Unequal measurement variance-based long base-line three-frequency ambiguity dissolving method
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  • Unequal measurement variance-based long base-line three-frequency ambiguity dissolving method

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[0060] In order to make the purpose, technical solution and advantages of the present invention clearer, the real-time mode of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0061] refer to figure 1 , for global positioning system (GPS), GLONASS satellite navigation system, Beidou satellite navigation system and other satellite navigation systems capable of broadcasting triple-frequency navigation signals, the present invention provides a long baseline triple-frequency ambiguity based on unequal measurement variance The solution method includes the following steps:

[0062] (1) Extract the pseudo-range noise of each frequency point according to the formula (1):

[0063] MP ind = ρ ind -(a 0 φ 1 +b 0 φ 2 +c 0 φ 3 ) (1)

[0064] Among them, MP ind The three frequencies to be extracted are f 1 ,f 2 ,f 3 Pseudorange noise at frequency points, ρ ind for the three frequencies f 1 ,f 2 ,f 3 Frequency ...

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Abstract

The invention proposes an unequal measurement variance-based long base-line three-frequency ambiguity dissolving method, and solves the problems that difference among pseudorange noises of different frequency points is not considered to cause that a combination coefficient is not optimal and the combination noise is relatively large during combination coefficient calculation of an existing methodby taking minimum combination noise as an optimal target. The fact that different frequency points are different in pseudorange noise, the condition is introduced to the combination coefficient calculation, so that the noise is minimum after combination, the required epoch numbers are reduced during smoothing ambiguity detection quantity of a second combination and a third combination by multipleepochs, the requirement on data continuity is reduced, and the unequal measurement variance-based long base-line three-frequency ambiguity dissolving method is of important significance to improvementof three-frequency ambiguity fixed success rate and further final improvement of positioning accuracy.

Description

technical field [0001] The invention relates to the technical field of high-precision data processing of satellite navigation systems, in particular to a three-frequency ambiguity resolution method under long baseline conditions. Background technique [0002] Ambiguity resolution is the basis for high-precision data processing of satellite navigation systems such as Precise Point Position (PPP) and Real-time Kinematic (RTK). At present, satellite navigation systems represented by Beidou and GPS can broadcast triple-frequency navigation signals, which bring information redundancy to ambiguity resolution and improve the success rate of ambiguity resolution. [0003] Under the long baseline condition, due to the weakening of the ionospheric spatial correlation, the ionospheric residual error after the double difference is large. Therefore, under the long baseline condition, the pseudorange observations are generally added to the observation combination to meet the constraint of...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/44
CPCG01S19/44
Inventor 陈飞强王耀鼎刘文祥刘哲王飞雪楼生强李峥嵘李井源黄龙牟卫华
Owner NAT UNIV OF DEFENSE TECH