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Ground-Based Augmentation System (GBAS): Difference between revisions

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Augmentation of a global navigation satellite system (GNSS) is a method of improving – “augmenting” - the navigation system's [[GNSS Performances|performances]], such as [[Integrity|integrity]], [[Continuity|continuity]], [[Accuracy|accuracy]] or [[Availability|availability]] thanks to the use of external information to the GNSS into the user position solution<ref name="GNSS Aug">[[Wikipedia:GNSS augmentation]]</ref><ref name="Kaplan">E.D. Kaplan, C.J. Hegarty, ''Understanding GPS Principles and Applications”, 2nd Ed., Artch House, ISBN 1-58053-894-0, 2006.</ref>.
Augmentation of a global navigation satellite system (GNSS) is a method of improving – “augmenting” - the navigation system's [[GNSS Performances|performances]], such as [[Integrity|integrity]], [[Continuity|continuity]], [[Accuracy|accuracy]] or [[Availability|availability]] thanks to the use of external information to the GNSS into the user position solution<ref name="GNSS Aug">[[Wikipedia:GNSS augmentation]]</ref><ref name="Kaplan">E.D. Kaplan, C.J. Hegarty, ''Understanding GPS Principles and Applications”, 2nd Ed., Artch House, ISBN 1-58053-894-0, 2006.</ref>.


A Ground-Based Augmentation System (GBAS) is a civil-aviation safety-critical system that supports local augmentation – at airport level – of the primary GNSS constellation(s) by providing enhanced levels of service that support all phases of approach, landing, departure and surface operations. While the main goal of GBAS is to provide [[Integrity|integrity]] assurance, it also increases the [[Accuracy|accuracy]] with position errors below 1 m (1 sigma).
A [[Ground-Based Augmentation System (GBAS)]] is a civil-aviation safety-critical system that supports local augmentation – at airport level – of the primary GNSS constellation(s) by providing enhanced levels of service that support all phases of approach, landing, departure and surface operations. While the main goal of GBAS is to provide [[Integrity|integrity]] assurance, it also increases the [[Accuracy|accuracy]] with position errors below 1 m (1 sigma).


==Introduction==
==Introduction==
The Ground Based Augmentation System (GBAS) is intended primarily to support
precision approach operations. It consists of a GBAS Ground Subsystem and a
GBAS Aircraft Subsystem. One GBAS Ground Subsystem can support an unlimited number of aircraft subsystems within its GBAS coverage volume. The ground subsystem provides the aircraft with approach path data and, for each satellite in view, corrections and integrity information. The corrections enable the aircraft to determine its position relative to the approach path more accurately.
The GBAS Signal in Space is defined to be only the data broadcast from the ground to the aircraft subsystem. The Satellite Signals in Space are part of the basic GNSS satellite constellations.


The ground infrastructure for GBAS includes two or more [[:Category:Receivers|GNSS receivers]] which collect pseudoranges for all the primary GNSS satellites in view and computes and broadcasts differential corrections and [[Integrity|integrity]]-related information for them based on its own surveyed position. These differential corrections are transmitted from the ground system via a [[Wikipedia:Very high frequency|Very High Frequency (VHF)]] Data Broadcast (VDB). The broadcast information includes pseudorange corrections, [[Integrity|integrity]] parameters and various locally relevant data such as Final Approach Segment (FAS) data, referenced to the [[Wikipedia:World Geodetic System|World Geodetic System (WGS-84)]].
The ground infrastructure for GBAS includes two or more [[:Category:Receivers|GNSS receivers]] which collect pseudoranges for all the primary GNSS satellites in view and computes and broadcasts differential corrections and [[Integrity|integrity]]-related information for them based on its own surveyed position. These differential corrections are transmitted from the ground system via a [[Wikipedia:Very high frequency|Very High Frequency (VHF)]] Data Broadcast (VDB). The broadcast information includes pseudorange corrections, [[Integrity|integrity]] parameters and various locally relevant data such as Final Approach Segment (FAS) data, referenced to the [[Wikipedia:World Geodetic System|World Geodetic System (WGS-84)]].


The aircraft within the area of coverage of the ground station may use the broadcast corrections to compute their own measurements in line with the differential principle. The differentially corrected position is used to generate navigation guidance signals.
The aircraft within the area of coverage of the ground station may use the broadcast corrections to compute their own measurements in line with the differential principle. The differentially corrected position is used to generate navigation guidance signals.


==Notes==
==Notes==

Revision as of 17:25, 18 May 2011


FundamentalsFundamentals
Title Ground-Based Augmentation System (GBAS)
Author(s) GMV
Level Basic
Year of Publication 2011
Logo GMV.png


Augmentation of a global navigation satellite system (GNSS) is a method of improving – “augmenting” - the navigation system's performances, such as integrity, continuity, accuracy or availability thanks to the use of external information to the GNSS into the user position solution[1][2].

A Ground-Based Augmentation System (GBAS) is a civil-aviation safety-critical system that supports local augmentation – at airport level – of the primary GNSS constellation(s) by providing enhanced levels of service that support all phases of approach, landing, departure and surface operations. While the main goal of GBAS is to provide integrity assurance, it also increases the accuracy with position errors below 1 m (1 sigma).

Introduction

The ground infrastructure for GBAS includes two or more GNSS receivers which collect pseudoranges for all the primary GNSS satellites in view and computes and broadcasts differential corrections and integrity-related information for them based on its own surveyed position. These differential corrections are transmitted from the ground system via a Very High Frequency (VHF) Data Broadcast (VDB). The broadcast information includes pseudorange corrections, integrity parameters and various locally relevant data such as Final Approach Segment (FAS) data, referenced to the World Geodetic System (WGS-84).

The aircraft within the area of coverage of the ground station may use the broadcast corrections to compute their own measurements in line with the differential principle. The differentially corrected position is used to generate navigation guidance signals.



Notes


References

  1. ^ Wikipedia:GNSS augmentation
  2. ^ E.D. Kaplan, C.J. Hegarty, Understanding GPS Principles and Applications”, 2nd Ed., Artch House, ISBN 1-58053-894-0, 2006.