搜索结果: 1-15 共查到“工学 Threat”相关记录24条 . 查询时间(0.063 秒)
A highly toxic water pollutant, known as perfluorooctanoic acid (PFOA), last year caused a number of U.S. communities to close their drinking water supplies. Because of its historical use in Teflon pr...
Ionospheric Estimation and Integrity Threat Detection
Ionospheric Estimation Integrity Threat Detection
2015/6/29
A full realization of the Wide Area Augmentation System (WAAS) is intended to provide aircraft guidance throughout the en route, terminal, non-precision and precision approach phases of ight.
The ionosphere is the largest remaining error source affecting GPS. It also has some of the least predictable spatial and temporal variations. As such the ionosphere becomes the determining factor in ...
Estimation of ICAO Threat Model Parameters For Operational GPS Satellites
Estimation ICAO Threat Model Parameters GPS Satellites
2015/6/26
The ICAO Second Order Step threat model defines a class of signal deformations that present a potential integrity threat to GPS-based aircraft landing systems such as the Local Area Augmentation...
LAAS Ionosphere Spatial Gradient Threat Model and Impact of LGF and Airborne Monitoring
LAAS Ionosphere Spatial Gradient Threat Model Airborne Monitoring
2015/6/26
The ionosphere spatial gradient and its temporal rate of change in the vicinity of a LAAS-equipped airport are likely to influence the architecture required to meet the Category II/III precision appro...
Ionosphere Threat to LAAS: Updated Model,User Impact,and Mitigations
Ionosphere Threat LAAS Updated Model
2015/6/26
Several severe ionosphere storms have occurred in recent years that tripped the WAAS storm detector and caused partial WAAS service shutdowns. Under extreme conditions, these spatial gradients can thr...
Ionosphere Spatial Gradient Threat for LAAS: Mitigation and Tolerable Threat Space
Ionosphere Spatial Gradient Threat LAAS:Threat Space
2015/6/26
The ionosphere spatial gradients under extreme conditions are likely to influence the LAAS architecture,particularly for Category II/III precision approach and landing systems. In previous study, a “m...
A Comprehensive Ionosphere Storm Data Analysis Method to Support LAAS Threat Model Development
Ionosphere Storm Support LAAS Threat Model
2015/6/26
Several recent papers have analyzed the potential threat of severe ionosphere spatial gradients on LAAS users [1-4]. To support this work, a comprehensive methodology has been developed to analyze WAA...
WAAS-Based Threat Monitoring for a Local Airport Monitor (LAM) that Supports Category I Precision Approach
WAAS-Based Threat Monitoring Local Airport Monitor (LAM) Category Precision
2015/6/26
The Federal Aviation Administration has sponsored the development of a Local Airport Monitor (LAM) prototype designed to enable GPS-based precision approach by leveraging the existing capabilities of ...
Mitigation of Anomalous Ionosphere Threat to Enhance Utility of LAAS Differentially Corrected Positioning Service (DCPS)
Mitigation Anomalous Ionosphere Threat LAAS Differentially Corrected Positioning Service (DCPS)
2015/6/25
Local Area Augmentation System (LAAS) can be used for both Category I (CAT I) precision approach and Differentially Corrected Positioning Service (DCPS) navigation applications. Through its support of...
Enabling LAAS Airport Surface Movement:Mitigating the Anomalous Ionospheric Threat
LAAS DCPS airport surface movement anomalous ionosphere
2015/6/25
The Local Area Augmentation System (LAAS) can be used for both precision approach and Differentially Corrected Positioning Service (DCPS) applications. Through its support of DCPS, the LAAS Ground Fac...
Ionospheric Threat Parameterization for Local Area Global-Positioning-System-Based Aircraft Landing Systems
Ionospheric Parameterization Local Area Global-Positioning-System-Based Aircraft Landing Systems
2015/6/25
Observations of extreme spatial rates of change of ionospheric electron content and the characterization strategy for mitigation applied by the U.S. local area augmentation system are shown. During ex...
Ionospheric Threat Mitigation by Geometry Screening in Ground-Based Augmentation Systems
Ionospheric Geometry Screening Ground-Based Augmentation Systems
2015/6/24
Large spatial variations in ionospheric delay of Global Navigation Satellite System signals observed during severe ionospheric storms pose potential threats to the integrity of the Ground-Based Augmen...
Constructing Ionospheric Irregularity Threat Model for Korean SBAS
Constructing Ionospheric Irregularity Threat Model Korean SBAS
2015/6/24
Single-frequency based Satellite-Based Augmentation Systems (SBAS), the augmentation of the Global Navigation Satellite System (GNSS), broadcast estimates of vertical ionospheric delays and confidence...
The Role of Perceived Collective Anger and Fear on Policy Support in Response to Terrorist Threat
Anger Collective emotion Counter-terrorism policy Fear Threat
2014/12/18
The current research investigates how the perceived emotional responses of a majority of Americans to 9/11 (i.e., collective anger and fear) affect individuals’ support for governmental policies, in p...
