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Threshold value determining method for local enhanced system completeness monitoring

A technology of integrity monitoring and enhancement system, applied in the field of satellite navigation, can solve problems such as the inability to guarantee full application

Inactive Publication Date: 2015-01-28
NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Often, these two approaches are used in combination, but there is no guarantee that they will work perfectly

Method used

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  • Threshold value determining method for local enhanced system completeness monitoring
  • Threshold value determining method for local enhanced system completeness monitoring
  • Threshold value determining method for local enhanced system completeness monitoring

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0024] The present invention utilizes the Gaussian distribution to envelop the probability density distribution of the observed data, and calculates the corresponding threshold value in combination with the requirements of the false alarm rate. The specific steps are as follows:

[0025] (1) Calculate the quantile corresponding to the false alarm rate

[0026] The false alarm rate required by the local area enhancement system is p, for the Gaussian distribution X~N(μ, σ 2 ), the threshold value is T=μ±a*σ, where a is the quantile corresponding to the false alarm rate (a>0), then the probability that the value of X exceeds the threshold value is P(|X-μ| >a*σ)=P(|S|>a)=p, where S is a standard normal distribution, S~N(0,1), then the quantile corresponding to the false alarm ...

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Abstract

The invention provides a threshold value determining method for local enhanced system completeness monitoring. According to the method, the corresponding quantile is calculated according to the false alarm rate requirements of a local enhanced system; then, a satellite elevation angle interval is divided according to actual use requirements, and in addition, collected observation quantity data are grouped according to the intervals; the average value and the standard difference of each group of data are calculated, and normalization processing is carried out; then, the expansion Gaussian distribution is utilized for enveloping the probability density distribution of the normalization data for thus calculating an expansion factor; the quantile, the average value, the standard value and the expansion factor are used for calculating the threshold value of each interval; finally, the threshold value of each interval is utilized for fitting to obtain a threshold value curve. The threshold value determining method has the advantages that the requirements of the local enhanced system on the false alarm rate are met, and meanwhile, the threshold value is determined by using the data collected by the system per se, so the threshold value determining method better conforms to the actual characteristics of the system.

Description

technical field [0001] The invention belongs to the field of satellite navigation, and relates to a method for determining a threshold value for integrity monitoring of a local area augmentation system. Background technique [0002] Satellite navigation has the advantages of all-weather, wide coverage and low cost, and has become the most important means of navigation in the navigation system. With the deepening of navigation applications, the traditional single point positioning service of satellite navigation system can no longer meet the requirements of accuracy and integrity required by various users. This requires the establishment of an augmentation system to enhance the navigation performance, and the local augmentation system is one of them. The local area augmentation system is widely used in the approach guidance of the airport to the aircraft. It is a ground-based augmentation system. The ground reference station uses multiple reference receivers (usually 3 to 4)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00G01S19/42
Inventor 熊帅吕超李斌王晓旺路阳
Owner NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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