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- W2601336090 abstract "Future versions of the Global Positioning System may supportsignificant levels of integrity, including a six secondTime To Alarm (TTA) for an appropriately equipped user.The present system, on the other hand, has no integrityrequirements other than a best effort by the OperationalControl Segment (OCS) operators to correct misleadingSignal In Space (SIS) issues as soon as possible. The“SVN 22 Event” of 2001, wherein a rogue satellite effectivelybroadcast incorrect information for nearly two hours,dramatically illustrated the extent of integrity risk in thecurrent system.This paper outlines activities — planned and in progress— to improve the integrity of the current GPS signal. Theactivities fall into two principal categories: (1) detectionof an erroneous SIS, and (2) mitigation of the error. Afteroutlining the limitations of the current system, we introducenear-term improvements that will — in the eventof a future erroneous SIS — reduce the user’s exposuretime from hours to minutes. Specifically, we introducea heterogeneous monitoring network that exploits currentsystems by the National Imagery and Mapping Agency(NIMA) , Jet Propulsion Laboratory (JPL) , the FAA’sWide Area Augmentation System (WAAS) and others toprovide timely alarms to the OCS. Analysis of alarms derivedfrom data from these alternate resources is presented,along with a format for sharing integrity alarms among thedifferent monitoring networks and the GPS system.We also discuss how these activities dovetail with theGlobal Dual-use Monitoring System (GDMS) initiativesponsored by the civil Interagency GPS Executive Board(IGEB), and how the concepts outlined in the paper canbe extended from SIS integrity issues to more general integrityrequirements for GPS." @default.
- W2601336090 created "2017-04-07" @default.
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- W2601336090 date "2002-09-27" @default.
- W2601336090 modified "2023-09-26" @default.
- W2601336090 title "Near-Term Integrity Improvements for the GPS Operational Control Segment" @default.
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