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Federal Aviation Administration. RF Blackout During RLV Reentry: Public Safety Implications. COMSTAC RLV Working Group Pradipta Shome 17 May 2007. Federal Aviation Administration. Federal Aviation Administration. Summary of conditions that lead to blackout. High reentry velocity

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Presentation Transcript
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Federal Aviation

Administration

RF Blackout During

RLV Reentry:

Public Safety Implications

COMSTAC RLV Working Group

Pradipta Shome

17 May 2007

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Federal Aviation

Administration

Federal Aviation

Administration

Summary of conditions that lead to blackout

  • High reentry velocity
  • Steep angle of attack
  • Body shape contributes to electron density
  • Velocity is the major determinant of flow field temperature and level of ionization
  • Onset of blackout ~ 300,000 ft and 25,000 ft/sec
    • End of blackout approx 80,000 ft and 18,000 ft/sec
  • ATC Implications
    • Maintain continuous communications

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Radio Frequency Blackout During RLV Reentry

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Federal Aviation

Administration

Federal Aviation

Administration

Why we should care

Orbital vehicles slated to come before AST in near future may be subject to blackout; e.g. Rocketplane Kistler OV and SpaceX two-stage reusable booster.

Future RLVs could remain in attenuated or blackout mode for extended periods, during a critical phase of the flight

Sub-orbitals might not blackout fully but experience communication degradation

To meet public Safety concerns, may need to maintain:

- Communications for telemetry and vehicle control

- Navigation and Tracking of vehicle

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Radio Frequency Blackout During RLV Reentry

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Federal Aviation

Administration

Federal Aviation

Administration

Future Concerns

  • Blackout remains a concern for space vehicles during critical phase of flight
  • Need to derive feasible frequency bands from atmospheric and plasma attenuation considerations
  • If frequency band is chosen, how to implement in spectrum management scheme
    • Spectrum plan may be changing
    • Spectrum is a finite resource
    • Spectrum allocation is a lengthy process

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Radio Frequency Blackout During RLV Reentry