PRELIMINARY RESULTS OF FLIGHT TEST PROGRAM TO DEVELOP A CURVED PATH NAVIGATOR

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PRELIMINARY RESULTS OF FLIGHT TEST PROGRAM TO
DEVELOP A CURVED PATH NAVIGATOR

• And set of new curved path approaches to landing
  using GPS/LAAS and WAAS
• The University of Oklahoma

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Curved PathMinimum Instrumentation Suite

• horizontal and vertical deviation indicators
• bearing ring
• ideal heading indicator
• roll out heading indicator
• distance to the active waypoint
• distance to the missed approach point
• turn anticipation indicator

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Curved Pathapproach definition

• FPAP
• LTP/FTP
• Threshold crossing height
• Approach angle
• Center of turn
• Far endpoint of straight section beyond turn
• Multiple turns can be added using the same format
  as above.

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Functional Diagram of Curved Path Navigator


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The Oklahoma University LAAS/WAAS PVT Source

• Collins GNLU-930 MMR
• LAAS/WAAS
• 1-2 m NSE with OU LAAS system

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Curved Path Navigator Processing

• Toshiba Libretto Laptop
• Condor Engineering ARINC 429 card
• OU Curved Path Navigator Software

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Curved Path Navigator Software
Approach status
Position
Horz and Vert dev
ENU velocity/position
WPT/MAP info
LAAS/ WAAS status
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Navigator Software Processing

• Read and unpack ARINC PVT information from MMR
• Compare present position to ideal Path
• Compute Horizontal and Vertical FTE
• Predict future Horizontal and Vertical FTE _at_ 5 Hz
  rate
• Pack output data in ARINC words
• Transmit to display

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The SOONER Curved Path Navigator Display
Compass Indicator
Distance to Waypoint
Vert Dev Indicator
Mode Select
Desired Course Indicator
Heading Bug
Horz Dev Indicator
SANDEL SN3308
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Curved Path Navigator Test Aircraft
Category B Rockwell Turbo Commander AC-680
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Curved Path Navigator 180 degree approach results
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Curved Path Navigator 180 degree approach results

• 13 curved approaches
• 180 degree turn
• 2 nm radius

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Curved Path Navigator 180 degree approach results
Subject Pilot B TSE
Subject Pilot A TSE
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Curve Path Navigator 180 Degree Results compared
to CRM metric
Distance to Threshold (m) PANS OPS METRIC (m) TSE (m) FTE (m) NSE (m)
Vertical 1200 5.8 4.98 4.67 1.33
4200 13.6 6.84 6.86 1.37
7800 27.4 28.8 28.21 1.17

Lateral 1200 17.5 2.02 1.1 .46
4200 40.9 16.9 16.8 .50
7800 79.6 56.1 56.1 .49
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Curved Path Navigator 90 degree approach results
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Curved Path Navigator 90 degree approach results

• 10 curved approaches
• 90 degree turn
• 2 nm radius

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Curved Path Navigator 90 degree approach results

• TSE 2 and 6 sigma isoprobability contors
• 10 curved approaches

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Curve Path Navigator 90 Degree Results compared
to CRM metric
Distance to Threshold (m) PANS OPS METRIC (m) TSE (m) FTE (m) NSE (m)
Vertical 1200 5.8 2.06 1.7 1.17
4200 13.6 6.7 6.6 1.33
7800 27.4 26.6 26.6 1.27

Lateral 1200 17.5 3.53 3.5 .52
4200 40.9 7.11 7.1 .51
7800 79.6 65.5 65.5 .46
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Curved PathPreliminary Observations

• Curved path navigation IS possible without a
  flight director
• The minimum instrumentation suite is sufficient
• No needle following!
• Curved path approaches can be made to conform to
  the CRM ILS metric

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Curved Path Navigator Acknowledgements

• Organizations involved with MLS curved path
  approaches
• Stanford University WAAS curved path

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Thanks to our Partners in the Curved Path
Navigator Effort

• Flight Standards OKC (AFS-420 TERPS)
• FAA Technical Center in Atlantic City
• Rockwell Collins
• Condor Engineering
• Sandel Avionics
• OU Electric Vehicle Research Institute Andy,
  Blevins, Chad, Chuck, Peter, Wally and Wen

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The End