Foundation augmentation system integrity monitoring method based on stable distribution

A ground-based enhancement system and integrity monitoring technology, applied in the field of satellite navigation, to achieve the effect of improving accuracy and reliability, and improving integrity and continuity

Pending Publication Date: 2020-12-25
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0006] In order to solve the problems existing in the existing system, the present invention provides a ground-based augmentation system integrity monitoring method based on stable distribution, collect data thro...

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  • Foundation augmentation system integrity monitoring method based on stable distribution
  • Foundation augmentation system integrity monitoring method based on stable distribution
  • Foundation augmentation system integrity monitoring method based on stable distribution

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Embodiment Construction

[0034] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0035] The ground-based augmentation system integrity monitoring method under multiple assumptions designed by the present invention models each threshold in GBAS integrity monitoring by introducing a stable distribution, and improves the accuracy of threshold modeling under the H2 integrity risk assumption of GBAS , thus improving the usability and security of the GBAS system, such as image 3 As shown, it specifically includes the following steps:

[0036] The ground station first performs differential processing on the collected data, that is, decodes the GNSS satellite signal, smoothes the pseudo-range with the carrier, generates pseudo-range correction information, and sends the pseudo-range correction information to the airborne user terminal in the form of a broadcast message.

[0037] Integrity monitoring, that is, a series of integrity mo...

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Abstract

The invention discloses a foundation augmentation system integrity monitoring method based on stable distribution. Through a method of combining stable distribution with maximum likelihood parameter estimation and quantile calculation, threshold modeling is performed on monitoring quantities such as code/ carrier divergence values and carrier-to-noise ratios involved in a ground station module ofa GBAS system based on H2 risk hypothesis, and the accuracy of threshold modeling is improved in a mode of dividing model intervals according to elevation angles and selecting confidence parameters ina monitoring process of the ground station module in the modeling process. The method solves the problems that a traditional threshold model depends too much on an empirical formula, the model is notaccurate enough and the applicability is low, and the credibility and availability of the GBAS integrity monitoring system are improved through more accurate threshold modeling.

Description

technical field [0001] The invention relates to a method for monitoring integrity of a ground-based augmentation system based on stable distribution, and belongs to the technical field of satellite navigation. Background technique [0002] The GNSS Ground-Based Augmentation System (GBAS) provides differential corrections and ensures the integrity of the navigation solution for aircraft flying precision approaches. The data processing system of GBAS is divided into two modules: the ground algorithm module and the user algorithm module. The ground module is mainly responsible for generating pseudorange correction information and integrity enhancement information, and monitoring various integrity risk failures; the user module is mainly responsible for Perform the tasks of pseudorange correction, position calculation and protection level calculation. [0003] In order to ensure the integrity performance required for operation, the GBAS ground station needs to monitor the space...

Claims

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Application Information

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IPC IPC(8): G01S19/20
CPCG01S19/20
Inventor 刘海颖孙颢陈捷马莹
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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