Analysis of future LAAS ‘availability’ at Hyderabad station for Precision Approach of aircraft

Author

Reddy, A.S. ; Jhansi, Batthula ; Sarma, A.D.

Author_Institution

Res. & Training Unit for Navig. Electron., Osmania Univ., Hyderabad, India

fYear

2012

fDate

7-9 Dec. 2012

Firstpage

865

Lastpage

868

Abstract

Local Area Augmentation System (LAAS) is basically designed by USA, to support aircraft precision approach and landing in poor visibility conditions. LAAS is still in conceptual stage in India. As LAAS is meant for safety-of-life systems, it must meet stringent requirement of achieving adequate service availability. LAAS availability varies with time and number of satellites in GPS constellation. It is dictated by Vertical Protection Level (VPL), the error bound in vertical direction. This paper analyzes the variation of instantaneous availability with time by computing VPL of all possible subset geometries visible over a period of one day at 24 different epochs. Also, availability is computed by varying Vertical Alert Limit (VAL). The results obtained are encouraging and agreeing with the results published elsewhere.

Keywords

Global Positioning System; aircraft landing guidance; avionics; precision engineering; GPS constellation; Hyderabad station; India; LAAS availability; USA; VAL; VPL; adequate service availability; aircraft precision approach; local area augmentation system; safety-of-life systems; subset geometries; vertical alert limit; vertical direction; vertical protection level; visibility conditions; Aerospace electronics; Aircraft; Availability; Global Positioning System; Receivers; Satellites; Standards; Availability; GPS; LAAS; VAL; VPL;

fLanguage

English

Publisher

ieee

Conference_Titel

India Conference (INDICON), 2012 Annual IEEE

Conference_Location

Kochi

Print_ISBN

978-1-4673-2270-6

Type

conf

DOI

10.1109/INDCON.2012.6420738

Filename

6420738