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Uplink Tune-in Parameter

Uplink Tune-in Parameter. M. Dugast ESA. a) Offset = 0. + Range. Rate. Ful = Frest. RF ON. - Range. T. + Range. + Range. b) Offset > 0. RF ON. Rate. Rate. Ful = Frest. Ful = Frest. RF ON. c) Offset < 0. - Range. - Range. T. T.

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Uplink Tune-in Parameter

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  1. Uplink Tune-in Parameter M. Dugast ESA

  2. a) Offset = 0 + Range Rate Ful = Frest RF ON - Range T + Range + Range b) Offset > 0 RF ON Rate Rate Ful = Frest Ful = Frest RF ON c) Offset < 0 - Range - Range T T OFFSET SWEEP (Or 3 legs sweep)Sweep Parameters – No Doppler compensation • Ful = UL Carrier frequency • Range = SweepRange • Rate = SweepRate • Offset = SweepFrequencyOffset • sweepFrequencyOffsetAdjustement = Fixed

  3. a) Doppler > 0 + Range + Range Frest RF ON Rate Ful = Frest Ful Rate RF ON - Range - Range T T OFFSET SWEEP (Or 3 legs sweep)Sweep Parameters – With Doppler compensation • Ful = UL Carrier frequency • Range = SweepRange • Rate = SweepRate • Offset = SweepFrequencyOffset • sweepFrequencyOffsetAdjustment = DopplerAdjusted Doppler adjustment consist of adding a computed offset equal to the doppler value. Can be added with a fixed SweepFrequencyOffset b) Doppler < 0 Frest

  4. If Range = 0 2 legs sweep + Range Frest or Offset Frest or Offset Initial Rate Initial Rate Rate Ful Ful Rate RF ON RF ON T - Range T Implementation of the Offset Sweep at ESAOne additional Parameter added • Ful = UL Carrier frequency • Range = SweepRange • Rate = SweepRate • Offset = SweepFrequencyOffset • sweepFrequencyOffsetAdjustment = Fixed / DopplerAdjusted • Inititial rate

  5. If Range = 0 2 legs sweep + Range RF ON Frest or Offset Frest or Offset Initial Rate Rate Ful Ful Rate RF ON T - Range T Problem related to the ESA offset sweepNo “Hold duration” defined • Ful = UL Carrier frequency • Range = SweepRange • Rate = SweepRate • Offset = SweepFrequencyOffset • sweepFrequencyOffsetAdjustment = Fixed / DopplerAdjusted • Inititial rate • Initial Hold duration Initial hold duration required to avoid Frequency jump while RF is ON or to achieve MEX1 acq sweep

  6. Ful + Offset Rate Frest Ful T RF ON Ful + Offset Rate Ful = Frest T RF ON Single leg - sweep Parameters No Doppler compensated • Ful = UL Carrier frequency • Rate = SweepRate • SweepEndFrequency • sweepFrequencyOffsetAdjustement = Fixed With Doppler compensation • Ful = UL Carrier frequency • Rate = SweepRate • SweepEndFrequency • sweepFrequencyOffsetAdjustement = DopplerAdjusted

  7. Implementation of the Single leg Sweep at ESAAdaptation to multileg sweep Doppler compensation is not implemented Hold duration is added Possibility to chain up to 10 Single legs in order to create any kind of sweep is provided Parameters for the Multileg sweep: • Ful = UL Carrier frequency (correspond to the sweep start frequency) • Number of Legs • Leg(i) SweepEndFrequency (always expressed as offset related to Ful) • Leg(i) SweepRate • Leg(i) Hold Duration

  8. 60 s XA2 110 Hz/s 7 khz Ful XA 110 Hz/s 7 khz 60 s XA1 Leg1 Leg2 Leg3 RF ON Example of multileg: Ulysses Acquisition Sweep • Ulysses Acquisition sweep is not symmetric and is not achievable with the current implementation of the standard offset sweep Parameters for the Multileg sweep: • Ful = UL Carrier frequency • Number of Legs = 3 • Leg1 SweepEndFrequency = XA1 • Leg1 SweepRate = 1 MHz/s • Leg1 Hold Duration = 60 sec • Leg2 SweepEndFrequency = XA2 • Leg2 SweepRate = 110 Hz/s • Leg2 Hold Duration = 60 sec • Leg3 SweepEndFrequency = 0 Hz • Leg3 SweepRate = 110 Hz/s • Leg3 Hold Duration = 0 sec

  9. Offset and Multileg sweep harmonisation • Introduction of the Doppler compensation in the Multileg sweep • Introduction of the Offset with initial rate (tbc) and initial hold duration in the Multileg sweep Parameters for the Ulysses sweep: • Ful = UL Carrier frequency • sweepFrequencyOffsetAdjustement = Fixed • SweepFrequencyOffset = XA1 • Initial Hold Duration = 60 sec • Initial rate (tbc ?) • Number of Legs = 2 (Multileg sweep) • Leg1 SweepEndFrequency = XA2 • Leg1 SweepRate = 110 Hz/s • Leg1 Hold Duration = 60 sec • Leg2 SweepEndFrequency = 0 Hz • Leg2 SweepRate = 110 Hz/s • Leg2 Hold Duration = 0 sec Parameters for the Standard sweep: • Ful = UL Carrier frequency • sweepFrequencyOffsetAdjustement • SweepFrequencyOffset • Initial Hold Duration • Initial rate (tbc) • Number of Legs = NULL (Standard sweep) • SweepEndFrequency = +Range • SweepRate • Hold Duration (tbc)

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