Interfaces

1
Interfaces

• Joel Kastner

2
Interfaces

• Widespread consensus exists within the SOFIA
  Project about the need for cooperation between
  the DCS, FSI teams, and other important players
  (e.g. Sterling Software)
• DCS design process has benefited tremendously
  from this atmosphere of cooperation
• For its part, the DCS is proactive in building
  and maintaining close ties with all parties

3
Interfaces

• Close ties with FSI teams fostered via on-site
  visits, interface workshops, telecons, document
  exchanges
• Close contact between DCS and FSI teams
  facilitates rapid development of DCS instrument
  commanding and data pipelining
• Preliminary observing mode descriptions and
  commanding scenarios for FORCAST HAWC received
  reviewed we are iterating with all 4 FSI teams
  on these designs
• Pipeline prototypes are already being developed
  by DCS w/ considerable assistance from FSI teams

4
EXAMPLE FORCAST Observing Mode Parameters (I.e.
Astronomical Observing Template AOT)
5
EXAMPLE FORCAST Observing Sequence
6
EXAMPLE HAWC Pipeline Requirements

• Generate elemental difference images (chop-rate
  image data) from demodulated sample-rate (ADC
  rate) data
• Process individual elemental difference images to
  assess noise and remove detector artifacts
• Co-add elemental difference images
• Integrate coadded difference images for each
  telescope pointing in a stare nod sequence
• Combine dithered image series into a mosaic
• Calibrate final, combined image intensities
  establish image coordinate system
• Merge/correlate image data with contemporaneous
  ancillary (HK, telescope, observatory) data
• Produce archive-quality products at each major
  processing step

7
EXAMPLE Prototype HAWC Pipeline

• Developed in vanilla IDL
• Uses data output by prototype HAWC simulator
  (author B. Loewenstein)

Demodulate sample-rate data
Coadd chop-rate images
8
EXAMPLE HAWC Data Products
product archived by DCS (TBR)

• ADC sample-rate pixel (telemetry) stream
• demodulated, raw elemental difference images
• cleaned, deglitched elemental difference images
• coadded elemental difference images
• merged, final dithered image w/ coordinate
  system attached
• image calibration files (and other ancillary data
  files)
• bad pixel glitch mask
• image noise characterization
• flat field
• telescope pointing history
• global HK data (HAWC, telescope, observatory)