Impact of receiver inter-frequency bias residual uncertainty on dual-frequency GBAS integrity

Kang, Kai; Fang, Kun; Zhu, Yanbo; Liu, Yuan; Wang, Zhipeng; Li, Qiang

doi:10.1016/j.cja.2022.01.006

Cited by 1 publication

(1 citation statement)

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“…Additional uncertainties derived from airborne errors, tropospheric errors and IFB need to be taken into account. Gaussian models developed by [44,45] are utilized rather than a remodeling of these errors. Then, a final GMM overbound can be obtained by convolving the Gaussian distributions with ( 13) to cover all the potential errors.…”

Section: Ifree-based Protection Level Calculation Utilizing Gmm Overb...mentioning

confidence: 99%

An Error Overbounding Method Based on a Gaussian Mixture Model with Uncertainty Estimation for a Dual-Frequency Ground-Based Augmentation System

et al. 2022

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To ensure the integrity of a ground-based augmentation system (GBAS), an ionosphere-free (Ifree) filtering algorithm with dual-frequency measurements is employed to make the GBAS free of the first-order ionospheric influence. However, the Ifree algorithm outputs the errors of two frequencies. The protection level obtained via the traditional Gaussian overbound is overconservative. This conservatism may cause false alarms and diminish availability. An overbounding framework based on a Gaussian mixture model (GMM) is proposed to handle samples drawn from Ifree-based GBAS range errors. The GMM is employed to model the single-frequency errors that concern the uncertainty estimation. A Monte Carlo simulation is performed to determine the accuracy of the estimated GMM confidence level obtained by using the general estimation approach. Then, the final GMM used to overbound the Ifree error distribution is analyzed. Based on the convolution invariance property, vertical protection levels in the position domain are explicitly derived without introducing complex numerical calculations. A performance evaluation based on a real-world road test shows that the Ifree-based vertical protection levels are tightened with a small computational cost.

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Section: Ifree-based Protection Level Calculation Utilizing Gmm Overb...mentioning

confidence: 99%

An Error Overbounding Method Based on a Gaussian Mixture Model with Uncertainty Estimation for a Dual-Frequency Ground-Based Augmentation System

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

Impact of receiver inter-frequency bias residual uncertainty on dual-frequency GBAS integrity

Cited by 1 publication

References 16 publications

An Error Overbounding Method Based on a Gaussian Mixture Model with Uncertainty Estimation for a Dual-Frequency Ground-Based Augmentation System

An Error Overbounding Method Based on a Gaussian Mixture Model with Uncertainty Estimation for a Dual-Frequency Ground-Based Augmentation System

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