A kind of Araim subset selection method and system based on Beidou constellation

A subset selection and constellation technology, applied in the field of satellite navigation, can solve problems such as unavailability, impact analysis results, and uneven constellation configuration

Active Publication Date: 2021-03-19
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the current Beidou regional constellation, for users in the Asia-Pacific region, the constellation configuration is not uniform enough and relatively concentrated
Therefore, when making fault assumptions on satellites, if the fault situations of all Beidou satellites are considered on average, some extreme assumptions will greatly affect the analysis results and even be unusable

Method used

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  • A kind of Araim subset selection method and system based on Beidou constellation
  • A kind of Araim subset selection method and system based on Beidou constellation
  • A kind of Araim subset selection method and system based on Beidou constellation

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Embodiment 1

[0076] According to the present invention, this embodiment only examines the rough correction of the azimuth configuration, and adopts the outlier detection method to eliminate satellites that do not need to be assumed to be faulty. In order to make the content of the present invention more clearly described, at first a kind of ARAIM subset selection system based on the Beidou constellation of the present invention is described, as figure 1 A schematic structural diagram of the ARAIM subset selection system based on the Beidou constellation in one embodiment of the present invention shown, a kind of ARAIM subset selection system based on the Beidou constellation includes the Beidou constellation 100 and the aircraft 200, and the Beidou constellation 100 includes 35 satellites (satellites 101 , satellite 102, ..., satellite 135), the aircraft 200 includes a signal receiving antenna 201 and a data processor 22, the signal receiving antenna 201 receives the signal sent by the Beid...

Embodiment 2

[0093] This embodiment only considers the fine correction of the azimuth configuration, and the difference from the first embodiment is that the center of mass with the smallest sum of squared errors is output, and the satellites that do not need to be assumed to be faulty are screened out through the cosine distance.

[0094] In order to illustrate the content of the present invention more clearly, an ARAIM subset selection system based on the Beidou constellation of the present invention will be described. Such as image 3 A schematic structural diagram of the ARAIM subset selection system based on the Beidou constellation shown in another embodiment of the present invention, a kind of ARAIM subset selection system based on the Beidou constellation includes the Beidou constellation 100 and the aircraft 200, and the Beidou constellation 100 includes 35 satellites (satellites 101, satellite 102, ..., satellite 135), the aircraft 200 includes a signal receiving antenna 201 and ...

Embodiment 3

[0129] This embodiment examines the fine correction of the elevation angle configuration. In order to clarify the content of the present invention, an ARAIM subset selection system based on the Beidou constellation of the present invention will be described. Such as Figure 7 Shown is a schematic diagram of the structure of the ARAIM subset selection system based on the Beidou constellation in another embodiment of the present invention, a kind of ARAIM subset selection system based on the Beidou constellation includes the Beidou constellation and aircraft, the Beidou satellite includes 35 satellites, and the aircraft includes signal receiving The antenna and the data processor, the signal receiving antenna receives the signal sent by the Beidou satellite, and sends the signal to the data processor, and performs ARAIM subset selection according to the position coordinates of the satellite, and the data processor selects the subset by the following method:

[0130] a) Divide the ...

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Abstract

An ARAIM subset selection method based on a BeiDou constellation includes: (a) deeming a current airspace as a two-dimensional plane and satellite distribution at some point as point distribution on the two-dimensional plane; (b) selecting coordinates of K satellites as original centroids, assigning each satellite to the closest original centroid by means of a K-Means algorithm to form K classification clusters, and recalculating a centroid of each classification cluster to obtain a centroid coordinate; (c) re-selecting the coordinates of the K satellites as the original centroids, repeating the calculation step (b) to calculate the sum of squared errors of the centroid obtained every time, and selecting the centroid with a minimum sum of squared errors as an output result; and (d) performing outlier detection on the output result of the step (c), and if an outlier appears, not performing fault assumption on a satellite at the outlier.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to an ARAIM subset selection method and system based on the Beidou constellation. Background technique [0002] Global Navigation Satellite System (GNSS) technology can provide global users with stable and accurate location information, and has been widely used in the aviation field. The navigation performance indicators required by users in the process of using global satellite navigation mainly include: accuracy, integrity, continuity and availability. Receiver Autonomous Integrity Monitoring (RAIM) can provide services for horizontal navigation during aircraft approach. Advanced Receiver Autonomous Integrity Monitoring (Advanced Receiver Autonomous Integrity Monitoring, ARAIM) is a new generation of satellite navigation integrity monitoring technology, which extends the conventional RAIM. ARAIM uses multiple GNSS constellations, dual frequencies, has the capability...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/42G01S19/23
CPCG01S19/23G01S19/42G01S19/20G01S19/06G01S19/258G06F17/18
Inventor 王志鹏施闯李庭林
Owner BEIHANG UNIV
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