FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2917804977> ?p ?o ?g. }

• W2917804977 abstract "The Wide Area Augmentation System (WAAS) [1] has found that the ranging signals from its geostationary (GEO) satellites can significantly improve the availability of vertical guidance, particularly in Alaska and at times when not all GPS satellites are operational. However, WAAS has also observed that the GEO ranging sources can be affected by errors that are bias-like in their behavior [2] [3] [4] [5] [6] [7]. Such errors do not change values randomly but may persist with a particular sign and magnitude for many hours or longer. Some of these bias errors commonly affect our reference receivers and may thus be difficult to observe and bound in real time. Others are readily observable but not necessarily easy to eliminate as they may impact user receivers differently.One such error results from incoherence between the code and the carrier signals. Unlike GPS, the GEO signals are generated on the ground and have to traverse the ionosphere both on the way up from the ground uplink station (GUS) to the GEO and then on the way down from the GEO to the user. The GUS electronics may not always be able to keep the two components perfectly aligned. This results in a code-carrier incoherency (CCI) that creates a varying error for users with different smoothing times. A user whose carrier smoothing filter has converged will see a different effect from a user who has not smoothed their code measurements with carrier data [2].When WAAS generates a confidence bound on the ranging accuracy of the GEO satellites, it must account for all different users and for every error source. Unfortunately, the protection level equations used by WAAS do not support the inclusion of bias terms or terms to account for different smoothing times [8]. Therefore, WAAS must conduct special analyses to bound these biases. This paper describes the analysis WAAS performs to ensure that the UDRE it broadcasts for each GEO safely bounds all users for all possible bias errors. This analysis accounts for other fault modes that may also be present, but not yet detected by the WAAS integrity monitors.Versions of GEO bias analyses have existed since before WAAS was commissioned in 2003. The analysis has been updated and significantly improved since those early more conservative approaches. WAAS is in the midst of replacing all three of its GEOs and will briefly have four operational ranging GEOs in the summer of 2019. Pseudorange bias terms can lead to much bigger user position errors when there are more such terms that may all align. This WAAS GEO bias analysis has been recently updated and each new GEO has been carefully examined to ensure the continued safe operation of GEO ranging. This paper describes this analysis and demonstrates the safety and performance of the new WAAS GEOs." @default.
• W2917804977 created "2019-03-02" @default.
• W2917804977 creator A5042334655 @default.
• W2917804977 creator A5071035456 @default.
• W2917804977 creator A5078573350 @default.
• W2917804977 date "2019-02-19" @default.
• W2917804977 modified "2023-10-08" @default.
• W2917804977 title "Safety Analysis of Ranging Biases on the WAAS GEOs" @default.
• W2917804977 cites W2078131232 @default.
• W2917804977 cites W2516470601 @default.
• W2917804977 cites W2615091106 @default.
• W2917804977 doi "https://doi.org/10.33012/2019.16679" @default.
• W2917804977 hasPublicationYear "2019" @default.
• W2917804977 type Work @default.
• W2917804977 sameAs 2917804977 @default.
• W2917804977 citedByCount "0" @default.
• W2917804977 crossrefType "proceedings-article" @default.
• W2917804977 hasAuthorship W2917804977A5042334655 @default.
• W2917804977 hasAuthorship W2917804977A5071035456 @default.
• W2917804977 hasAuthorship W2917804977A5078573350 @default.
• W2917804977 hasConcept C115051666 @default.
• W2917804977 hasConcept C127162648 @default.
• W2917804977 hasConcept C127413603 @default.
• W2917804977 hasConcept C138660444 @default.
• W2917804977 hasConcept C146978453 @default.
• W2917804977 hasConcept C163150518 @default.
• W2917804977 hasConcept C16405173 @default.
• W2917804977 hasConcept C177264268 @default.
• W2917804977 hasConcept C19269812 @default.
• W2917804977 hasConcept C199360897 @default.
• W2917804977 hasConcept C205649164 @default.
• W2917804977 hasConcept C2776760102 @default.
• W2917804977 hasConcept C31972630 @default.
• W2917804977 hasConcept C3770464 @default.
• W2917804977 hasConcept C41008148 @default.
• W2917804977 hasConcept C60229501 @default.
• W2917804977 hasConcept C62649853 @default.
• W2917804977 hasConcept C76155785 @default.
• W2917804977 hasConcept C79403827 @default.
• W2917804977 hasConceptScore W2917804977C115051666 @default.
• W2917804977 hasConceptScore W2917804977C127162648 @default.
• W2917804977 hasConceptScore W2917804977C127413603 @default.
• W2917804977 hasConceptScore W2917804977C138660444 @default.
• W2917804977 hasConceptScore W2917804977C146978453 @default.
• W2917804977 hasConceptScore W2917804977C163150518 @default.
• W2917804977 hasConceptScore W2917804977C16405173 @default.
• W2917804977 hasConceptScore W2917804977C177264268 @default.
• W2917804977 hasConceptScore W2917804977C19269812 @default.
• W2917804977 hasConceptScore W2917804977C199360897 @default.
• W2917804977 hasConceptScore W2917804977C205649164 @default.
• W2917804977 hasConceptScore W2917804977C2776760102 @default.
• W2917804977 hasConceptScore W2917804977C31972630 @default.
• W2917804977 hasConceptScore W2917804977C3770464 @default.
• W2917804977 hasConceptScore W2917804977C41008148 @default.
• W2917804977 hasConceptScore W2917804977C60229501 @default.
• W2917804977 hasConceptScore W2917804977C62649853 @default.
• W2917804977 hasConceptScore W2917804977C76155785 @default.
• W2917804977 hasConceptScore W2917804977C79403827 @default.
• W2917804977 hasLocation W29178049771 @default.
• W2917804977 hasOpenAccess W2917804977 @default.
• W2917804977 hasPrimaryLocation W29178049771 @default.
• W2917804977 hasRelatedWork W1590886964 @default.
• W2917804977 hasRelatedWork W1973123391 @default.
• W2917804977 hasRelatedWork W1984207005 @default.
• W2917804977 hasRelatedWork W1996417993 @default.
• W2917804977 hasRelatedWork W2000342594 @default.
• W2917804977 hasRelatedWork W2153004494 @default.
• W2917804977 hasRelatedWork W241864963 @default.
• W2917804977 hasRelatedWork W2594043982 @default.
• W2917804977 hasRelatedWork W2886040605 @default.
• W2917804977 hasRelatedWork W3204116716 @default.
• W2917804977 isParatext "false" @default.
• W2917804977 isRetracted "false" @default.
• W2917804977 magId "2917804977" @default.
• W2917804977 workType "article" @default.