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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
