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A Long Baseline Triple-Frequency Ambiguity Resolution Method Based on Unequal Measurement Variances

A technology with ambiguity and long baseline, which is applied in measurement devices, radio wave measurement systems, satellite radio beacon positioning systems, etc. The effect of reducing the number of epochs

Active Publication Date: 2021-06-04
NAT UNIV OF DEFENSE TECH
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  • Application Information

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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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  • A Long Baseline Triple-Frequency Ambiguity Resolution Method Based on Unequal Measurement Variances
  • A Long Baseline Triple-Frequency Ambiguity Resolution Method Based on Unequal Measurement Variances
  • A Long Baseline Triple-Frequency Ambiguity Resolution Method Based on Unequal Measurement Variances

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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 present invention proposes a long-baseline three-frequency ambiguity resolution method based on non-equal measurement variance, which solves the problem of not considering the pseudo-range noise of different frequency points when the existing method calculates the combination coefficient with the minimum combination noise as the optimal goal. The difference caused by the combination coefficient is not optimal and the combination noise is large. The present invention considers the fact that the pseudo-range noise of different frequency points is different, and introduces this condition into the calculation of the combination coefficient, so that the noise after the combination is minimized, and the ambiguity detection amount of the second and third combination is smoothed by using multiple epochs , which reduces the number of required epochs and lowers the requirement for data continuity, which is of great significance for improving the success rate of three-frequency ambiguity fixation and finally improving the 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 Patents(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