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GISMO Navigation John Sonntag EG&G Technical Services, Inc. 31 January 2007

GISMO Navigation John Sonntag EG&G Technical Services, Inc. 31 January 2007. Navigation Techniques. Two navigation tools available Soxmap Used for May 2006 GISMO Standard Twin Otter tool Visual aid for flight crew Best for following curved path Course Deviation Indicator (CDI)

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GISMO Navigation John Sonntag EG&G Technical Services, Inc. 31 January 2007

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  1. GISMO Navigation John Sonntag EG&G Technical Services, Inc. 31 January 2007

  2. Navigation Techniques • Two navigation tools available • Soxmap • Used for May 2006 GISMO • Standard Twin Otter tool • Visual aid for flight crew • Best for following curved path • Course Deviation Indicator (CDI) • Will be used for 2007 GISMO • Can couple to aircraft steering • Good repeatability for long straight lines

  3. 23 May 2006 Mission Plan • Flight plan was out-and-back • Thule to Camp Century, then southeast along 18 May 1999 ATM/KU flight track • Inbound leg offset 25 m to south of outbound • Constant 10,000' pressure altitude

  4. 060523 Steering Performance (1) • Red dots: outbound leg • Blue dots: inbound leg • Black lines are the target lines • Target lines are separated by 25 m • Top panel is at 300 km along-track from Thule, bottom at 400 km • Inbound/outbound separation in top panel is ~35 m • Inbound/outbound separation in bottom panel is <=175 m

  5. 060523 Steering Performance (2)

  6. 060523 Steering Performance (3)

  7. 24 March 2006P-3 Steering Error with CDI

  8. Lessons Learned from May 2006 • 2006 GISMO flight used Soxmap / Twin Otter combination • Configuration more suitable for outlet glacier work • Steering within +/-50m, could be better • 2007 GISMO flights will use CDI with P-3 • Better repeatability for straight flight lines • Consistent 25-m separation still difficult to maintain • More info: atm.wff.nasa.gov; click “Aircraft Navigation”

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