1 Jacob Campbell Jacob Campbell Advisor: Maarten Uijt de Haag, Advisor: Maarten Uijt de Haag, Ph D. Ph D. Presented at: Presented at: JUP Quarterly Review JUP Quarterly Review Atlantic City Atlantic City October 26, 2000 October 26, 2000 Issues using Radar Altimeters Issues using Radar Altimeters for a Real-Time Integrity Monitor for a Real-Time Integrity Monitor for SVS for SVS
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1 11 1 Jacob Campbell Advisor: Maarten Uijt de Haag, Ph D. Presented at: JUP Quarterly Review Atlantic City October 26, 2000 Issues using Radar Altimeters.
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Jacob CampbellJacob Campbell
Advisor: Maarten Uijt de Haag, Ph D.Advisor: Maarten Uijt de Haag, Ph D.
Presented at:Presented at:
JUP Quarterly ReviewJUP Quarterly Review
Atlantic CityAtlantic City
October 26, 2000October 26, 2000
Issues using Radar AltimetersIssues using Radar Altimetersfor a Real-Time Integrity Monitor for a Real-Time Integrity Monitor
for SVSfor SVS
Issues using Radar AltimetersIssues using Radar Altimetersfor a Real-Time Integrity Monitor for a Real-Time Integrity Monitor
for SVSfor SVS
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• Background
• TAWS vs. SVS
• Terrain Database Integrity
• Integrity Algorithms
• Future Work
OverviewOverviewOverviewOverview
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• Terrain Awareness Warning Systems (advisory only) have been mandated by the FAA
• Significant R&D investment is being made to reduce CFIT» NASA’s Aviation Safety Program
» FAA’s SafeFlight21 Program
» NIMA’s Ron Brown Airfield Initiative
• Shuttle Radar Topography Mission
• Previous work at OU on integrity monitor
• De-classification of the Department of Defense (DoD) digital terrain elevation data (DTED) level I
BackgroundBackgroundBackgroundBackground
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• Generally provides a Plan display
(note: Universal has a perspective display)
• Data Sources» Terrain Database (also can include obstacles)
From the set of candidate points pick the closest onefor comparison with the database data
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Radar Altimeter CharacterizationRadar Altimeter CharacterizationDatabase Profile to Rwy 16 using the NGS data and the “Spot” AlgorithmDatabase Profile to Rwy 16 using the NGS data and the “Spot” Algorithm
Radar Altimeter CharacterizationRadar Altimeter CharacterizationDatabase Profile to Rwy 16 using the NGS data and the “Spot” AlgorithmDatabase Profile to Rwy 16 using the NGS data and the “Spot” Algorithm
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Radar Altimeter CharacterizationRadar Altimeter CharacterizationT Statistic for Approach to Runway 16T Statistic for Approach to Runway 16
Radar Altimeter CharacterizationRadar Altimeter CharacterizationT Statistic for Approach to Runway 16T Statistic for Approach to Runway 16
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Slant Range StatisticsSlant Range Statistics
r
x
Y
Horizontal Errors in Terrain Map into Slant Range
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But Does All This Give Integrity?But Does All This Give Integrity?
• Some Data Base Errors Could Slip Past
Translation Error
True Position
Displayed Position
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Integrity MonitoringIntegrity Monitoring
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T Statistic (Absolute Disparity) forEntire Search Area