GBAS integrity warning threshold estimation method based on Gaussian expansion method

A technology of integrity and expansion method, which is applied to satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve the problems that the warning threshold has no universality, no applicability, and lack of theoretical basis, so as to reduce the integrity The effect of sexual false alarm rate

Inactive Publication Date: 2018-11-16
THE 28TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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Problems solved by technology

At present, there are mainly two methods for estimating the warning threshold of integrity parameters: one is to determine the warning threshold according to the Stanford LAAS empirical formula, which lacks theoretical basis and the Stanford empirical formula is based on GPS satellites and their receivers. The Beidou ground-based augmentation system is also not applicable. The other is to determine the warning threshold according to the mathematical model of the integrity warning threshold. Due to the inconsistent environmental conditions in actual use, there may be a big difference between the actual value and the established model. Warning thresholds are not universal

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  • GBAS integrity warning threshold estimation method based on Gaussian expansion method
  • GBAS integrity warning threshold estimation method based on Gaussian expansion method
  • GBAS integrity warning threshold estimation method based on Gaussian expansion method

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[0035] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0036] Such as figure 1 As shown, the present invention provides a GBAS integrity warning threshold estimation method based on the Gaussian expansion method, figure 1 The process of estimating the integrity warning threshold based on the Gaussian inflation method includes the following steps:

[0037] (1) The receiver collects satellite signals, and calculates the integrity sample data to be monitored according to the GBAS integrity criteria; the integrity sample data includes: carrier difference, pseudocode-carrier deviation CCD, carrier-to-noise ratio C / N0, carrier Smooth code phase measurement value Inno, etc.; moreover, depending on the integrity object to be monitored, the integrity criteria adopted are different, it is necessary to calculate the pseudo code-carrier deviation degree based on the pseudo-range and carrier phase to monitor ...

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Abstract

The invention discloses a GBAS integrity warning threshold estimation method based on a Gaussian expansion method. The method comprises the following steps: calculating integrity sample data accordingto integrity monitoring criteria; then, dividing parameter intervals according to the satellite elevation angle, and calculating mean value and standard deviation of the sample data in each interval;carrying out normalization on the sample data; then, drawing a distribution histogram of the normalized data; and finally, determining the optimal expansion factor through the Gaussian expansion method and generating a warning threshold value. The method meets requirements of a ground-based augmentation system for false alarm rate, and meanwhile, the integrity warning threshold determined throughthe Gaussian expansion method based on system actual data accords with the actual characteristics of the system more.

Description

technical field [0001] The invention belongs to the field of satellite-based navigation enhancement systems, and in particular relates to a GBAS integrity warning threshold estimation method based on a Gaussian expansion method. Background technique [0002] The application of satellite navigation systems in civil aviation can effectively improve the flight safety and efficiency of aircraft. The Ground Based Augmentation System (GBAS) based on differential positioning and integrity monitoring is an important development direction for aircraft precision approach and landing in the future. , and is also one of the core infrastructures for performance-based navigation recommended by ICAO. GBAS is mainly composed of ground system, space system and user system. The ground system usually includes 3 to 4 reference receivers, data center processing station, and differential and integrity parameter broadcasting station. The reference receiver receives space satellite signals in real...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/20
CPCG01S19/20
Inventor 胡杰严勇杰石潇竹李贺孙奇伟单尧
Owner THE 28TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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