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RF Blackout During RLV Reentry: Public Safety Implications

This presentation discusses the implications and future concerns regarding radio frequency blackout during reentry of reusable launch vehicles (RLVs). The Federal Aviation Administration highlights the impact of blackout on communication and safety, emphasizing the need for continuous communications, telemetry, and vehicle control during critical flight phases. Furthermore, it delves into the challenges of deriving feasible frequency bands from atmospheric and plasma attenuation, along with the evolving spectrum management schemes. Spectrum allocation being a lengthy process, addressing blackout concerns for space vehicles is crucial for ensuring public safety in future space missions.

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RF Blackout During RLV Reentry: Public Safety Implications

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  1. Federal Aviation Administration RF Blackout During RLV Reentry: Public Safety Implications COMSTAC RLV Working Group Pradipta Shome 17 May 2007

  2. 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 Title of Presentation (This text must be edited in the Master Slide) Name or Date 2 2 2 2 Radio Frequency Blackout During RLV Reentry

  3. 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 Title of Presentation (This text must be edited in the Master Slide) Name or Date 3 3 3 3 Radio Frequency Blackout During RLV Reentry

  4. 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 Title of Presentation (This text must be edited in the Master Slide) Name or Date Title of Presentation (This text must be edited in the Master Slide) Name or Date Title of Presentation (This text must be edited in the Master Slide) Name or Date 4 4 4 4 4 4 4 4 4 Radio Frequency Blackout During RLV Reentry

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