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Evaluation of a Truth Evaluation of a Truth Reference System for High Reference System for High
Dynamic Flight TestingDynamic Flight Testing
Avionics Engineering Center, Ohio University
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Truth Reference EvaluationTruth Reference Evaluation
Michael S. Braasch, Ph.D., P.E.Associate Professor of Electrical
EngineeringAvionics Engineering CenterOhio UniversityPh: 740-593-0105Email: [email protected]
Avionics Engineering Center, Ohio University
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Expanded Flight TestingExpanded Flight Testing
High altitude (up to FL 390)
High speed (Vne = 440 kts)
High dynamics (fully aerobatic)
Avionics Engineering Center, Ohio University
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Expanded Research Expanded Research OpportunitiesOpportunities
Space range safety test bedGPS acquisition and tracking under high
dynamicsGPS/INS testingFlight control researchSAR test bedYour R&D flight test
Avionics Engineering Center, Ohio University
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AeroVodochody L-29 Delfin AeroVodochody L-29 Delfin SpecificationsSpecifications
Max Gross Weight: 7826 lbMax Crew Weight: 250 lb ea.G-limits: +8, -4Fuselage Tanks: 1000 L /
264 GWing Tanks: 300 L / 79 G
Avionics Engineering Center, Ohio University
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Specifications (cont’d)Specifications (cont’d)
Takeoff speed: 100 kts Initial climb speed: 190 kts Vne: 440 kts (Mach 0.7) Cruise speed: 320 kts Fuel consumption: 150 gal/hr Length: 36’; Wingspan: 34’; Height: 10’
Avionics Engineering Center, Ohio University
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First Flight TestFirst Flight Test
July 12, 2000Chillicothe, Ohio (RZT)Ashtech Z-12 (Ground and Air)Low Dynamics (static, taxi, take-off)Medium Dynamics (steep turns)High Dynamics (2g & 3g turns, aileron
rolls)
Avionics Engineering Center, Ohio University
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Flight Test GoalFlight Test Goal
Evaluate traditional GPS-based truth reference system– Survey-type, dual-frequency GPS receivers– Ashtech PNAV software set for ‘aircraft’
dynamics (note: low-dynamic photogrammetry profiles are expected with this mode)
– Limitation: no truth reference to check the truth reference
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ConclusionsConclusions Conventional truth reference system is not
applicable in a high dynamic aircraft GPS receivers capable of high dynamics
(such as the Ashtech G12) should be investigated
Differential carrier-phase processing software should also be tuned for the dynamic environment
Additional flight testing scheduled with G12’s in the next couple of months
