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Receiver autonomous integrity monitoring and troubleshooting method based on student's t-distribution

A troubleshooting method and integrity technology, applied in the field of satellite positioning, can solve problems such as weak error detection capability

Active Publication Date: 2017-04-19
CHINA RAILWAYS CORPORATION +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned RAIM algorithm based on "snapshot" theory has weak detection ability for medium-sized error faults

Method used

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  • Receiver autonomous integrity monitoring and troubleshooting method based on student's t-distribution
  • Receiver autonomous integrity monitoring and troubleshooting method based on student's t-distribution
  • Receiver autonomous integrity monitoring and troubleshooting method based on student's t-distribution

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Embodiment Construction

[0042] The following describes the embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The following embodiments described with reference to the accompanying drawings are exemplary, and are only used to explain the present invention, and cannot be construed as limiting the present invention.

[0043] Those skilled in the art can understand that, unless specifically stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, elements...

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Abstract

The embodiment of the invention provides a receiver autonomous integrity monitoring and troubleshooting method based on student's t-distribution. The method comprises the steps of respectively calculating by adopting a student's t-distribution algorithm according to a plurality of satellite sets in an RAIM (Receiver Autonomous Integrity Monitoring) operation period to acquire a plurality of parity vectors, calculating a parity vector sample mean x-bar and a sample variance S of (m+1) sampling in a plurality of parity vector sets Samp1, calculating a test statistic T, comparing the test statistic T with a preset threshold TD, and determining whether there is a satellite with pseudo-range deviation in the satellite sets or not according to a comparison result; and if the satellite sets are determined to have no satellite with pseudo-range deviation, outputting a satellite set Setj without a deviation trouble, calculating a horizontal protection level HPL of the satellite set Setj without a deviation trouble, and determining whether a positioning result of the satellite set Setj without a deviation trouble meets performance requirements or not. The method provided by the invention makes full use of information between redundant receivers, and various system troubles including receiver noises can be monitored.

Description

Technical field [0001] The invention relates to the technical field of satellite positioning, in particular to a method for autonomous integrity detection and troubleshooting of a receiver based on student t distribution. Background technique [0002] The RAIM (Receiver Autonomous Integrity Monitoring) algorithm monitors the integrity of the user's positioning results based on the redundant observations of the user's receiver. Its purpose is to detect malfunctioning satellites during the navigation process and ensure the accuracy of navigation and positioning. . [0003] Generally speaking, it is required that the number of visible satellites be more than 5 to perform GPS completeness detection; only 6 or more satellites can be used to identify faulty satellites. The RAIM algorithm can be implemented in different ways, one of which is to check the consistency of various visible satellite positioning subsets. If the consistency fails, an early warning can be provided for the fligh...

Claims

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Application Information

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IPC IPC(8): G01S19/20
CPCG01S19/20
Inventor 王剑靳成铭蔡伯根
Owner CHINA RAILWAYS CORPORATION
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