[Nspcsg] NSP CSG Iono Anomaly Discussion

[Harris, Matt]

NSP CSG,

As a result of today's ionosphere gradient monitor requirements discussion, we decided to meet once more in two days (Friday, September 5, same time as today's call).

Agenda:

-       Review previous Honeywell NSP paper describing observed tropospheric effects
-       Review Boeing simulation results that we ran out of time for today
-       Comments or questions for Susumu Saito on plasma bubble observations he presented today
-       Comments or questions on straw-man SARPS gradient monitor requirements discussed today
-       Welcome any other feedback or material that comes up
-       Desired actions and outcomes for October NSP CSG meeting

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Very brief notes from today's discussion:

Plasma bubble observations:
Susumu Saito, ENRI, presented observations of larger plasma bubble gradients (515mm/km with 7km width).  These observations may fall within the scope of the bubble model that was used to validate the SARPS requirements previously with 1.5 second time to detect.  Susumu Saito and Matt Harris will verify that gradients up to 700mm/km were simulated for the plasma bubble scenarios and consider writing guidance material for the specific plasma bubble model used in validation.  Also, the wedge model could be adapted to include larger gradients, potentially with limited maximum delay, but Matt believes this may result in undetectable errors that are larger than acceptable for GAST D.  If time-to-detect is allowed to increase, then does the plasma bubble validation also need to be performed again for larger values, or do we need to modify SARPS requirements to account for different ionospheric environments?

SARPS requirement / Tropo effect:
        It is difficult for ground manufacturers to validate the proposed requirements for increased time-to-detect since the tropospheric effect is not well understood or modeled in terms of frequency, time constant, size, etc.  Also, there is no detailed technical solution in the public domain, and it might vary depending on the specific implementation of a gradient monitor.  We plan to discuss the previous papers by Honeywell at the next call to provide any additional details on the tropo effect to help the group understand the phenomenon enough to validate or agree with the proposed requirements.  We will also discuss the simulation work being used to derive the time-to-detect requirements since we ran out of time today.



Thanks,
Matt Harris
Electronic Systems / Avionics
Boeing Commercial Airplanes
P.O. Box 3707  MC 0L-83
Seattle, WA 98124
(425) 266-0889




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