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GBAS (Ground Based Augmentation System) protection level integrity risk allocation method based on Bayesian decision

An allocation method and integrity technology, applied in the field of satellite navigation and positioning, can solve the problem that the protection level cannot faithfully reflect the error of the navigation system, and achieve the effect of improving usability and reducing error rate

Active Publication Date: 2019-08-27
CIVIL AVIATION UNIV OF CHINA
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Problems solved by technology

This method fails to reflect the probability of the protection level exceeding the limit according to the actual situation, so that the calculated protection level cannot faithfully reflect the navigation system error

Method used

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  • GBAS (Ground Based Augmentation System) protection level integrity risk allocation method based on Bayesian decision
  • GBAS (Ground Based Augmentation System) protection level integrity risk allocation method based on Bayesian decision
  • GBAS (Ground Based Augmentation System) protection level integrity risk allocation method based on Bayesian decision

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Embodiment Construction

[0041] The Bayesian decision-based GBAS protection level integrity risk allocation method provided by the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0042] Such as figure 1 As shown, the GBAS protection level integrity risk allocation method based on Bayesian decision-making provided by the present invention includes the following steps carried out in order:

[0043] 1) Using the missing detection product factor obtained from the integrity risk allocation method proposed in the DO-245A standard promulgated by the Aeronautical Radio Technical Committee, calculate H 0 and H 1 Vertical and horizontal protection levels under assumptions;

[0044] For the sake of safety, the misleading information probability in the present invention is the protection level integrity risk probability required in the DO-245A standard promulgated by the Aeronautical Radio Technical Committee.

[0045] In GBAS, the p...

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Abstract

The invention relates to an integrity risk allocation method based on Bayesian decision. The method comprises the steps of adopting a leakage detection product factor, and calculating vertical and horizontal protection levels under the assumption of H0 and H1; taking the protection levels as an integral limit value and a positioning error as the integral variable to perform integration on a probability density function under the assumption of H0 and H1 so as to obtain misinformation probability under the assumption of H0 and H1; based on the Bayesian decision minimum total error rate criterionand the misinformation probability, counting the proportion of the misinformation in the total sampling number under the assumption of H0 and H1, reallocating the total misinformation probability, and calculating a new leakage detection product factor; calculating the vertical and horizontal protection levels under the assumption of H0 and H1 according to the new leakage detection product factor,taking the maximum value of the vertical and horizontal protection levels as the protection level of the GBAS on-board terminal, and the like. According to the method in the invention, the error rateof integrity risk probability allocation is effectively reduced, the actual positioning error is tightly enveloped by the calculated vertical and horizontal protection levels, and the usability of the navigation system is improved.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation and positioning, and in particular relates to a GBAS (civil aviation ground-based augmentation system) protection-level integrity risk allocation method based on Bayesian decision-making. Background technique [0002] The integrity of the navigation system is one of the important indicators of the required navigation performance (RNP) in the precision approach and landing phase of civil aviation. It refers to the ability to provide timely and effective warnings within the specified time in the event of a system failure. The indicators describing integrity mainly include alarm time, integrity risk, protection level and alarm threshold. Among them, the integrity risk refers to the probability that the non-faulty airborne equipment processes the data broadcast by the GBAS ground station, and the vertical or horizontal positioning error exceeds the limit but does not give an alarm within ...

Claims

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Application Information

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IPC IPC(8): G01S19/20G06N7/00
CPCG01S19/20G06N7/01
Inventor 倪育德刘希之
Owner CIVIL AVIATION UNIV OF CHINA
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