Kalman Filter

General parameters:
  • Intmat = 20090925_151900
  • modes = 400 KLs
  • modulation radius = 3 lambda/D
  • sampling frequency: 1kHz
  • CCD47: Filter 800nm-40nm

NOTES:
  • CCD47: Strange popcorn pattern always present....

Open loop

20090930_112233

We applied the disturbance and took open-loop data.
  • Disturbance: ....._20090928_145548.fits
    • freq: 1kHz.
    • atm: seeing 0.8, vwind=15m/s.
    • vib: TT modes, 21Hz, 100mas, damping 0.
    • oversampling OFF
  • High flux conditions (maxof the lamp)
  • 12000 iterations (since decimation is 1 over 3, in this way we can get all original realizations).

Closed loop with integrator

Lower the flux (500-600 photons per subaperture)

20090930_112926
  • Gain = 0.3

NOTES:
  • Loop OK
  • CCD47 PSF at the border. Vibrations too big and it goes out of sight...
  • No modal attenuation on low-order modes. Furthermore, modes higher than #100 go in overshoot.

Closed loop with Kalman filter

  • Disturbance: ....._20090929_102737.fits
    • freq: 1kHz.
    • atm: seeing 0.8, vwind=15m/s.
    • vib: TT modes, 21Hz, 20mas, damping 0.
    • oversampling OFF
  • High flux conditions (1150 ph/subap)
20090930_124759

  • gain=0.01 for all modes

Open loop

20090930_ 125003

Since we changed the disturbance, we took a new OL data set.

Disturbance: ....._20090929_102737.fits

Closed loop with Kalman filter

  • Disturbance: ....._20090929_102737.fits
  • High flux conditions (1150 ph/subap)
20090930_125223

  • gain=0.05 for all modes

NOTES:
  • Waffle mode slowly arising.

Closed loop with H-infinity

  • Disturbance: ....._20090929_102737.fits
  • High flux conditions (1150 ph/subap)

Diverges immediately, even with no disturbance, and with low gains.

20090930_135408
  • Transitory saved to analyse the divergence of H-infinity

-- GuidoAgapito - 2009-10-30
Topic revision: r2 - 30 Oct 2009, GuidoAgapito
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