Difference between revisions of "The HFI DPC"

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The HFI DPC has been organized into three different "Levels": 1, 2 and 3.  
 
 
The HFI DPC has been organized into a number of different "Levels": 1, 2 and 3.  
 
  
 
== Level 1 ==
 
== Level 1 ==
  
 
The (L1): which consists in receiving the telemetry and ancillary data files and ingesting them into the DPC database.  This involves decompressing, in some cases changing data formats, computing the time of individual data samples from the time of the compression slices, but otherwise no processing proper. Other steps are:
 
The (L1): which consists in receiving the telemetry and ancillary data files and ingesting them into the DPC database.  This involves decompressing, in some cases changing data formats, computing the time of individual data samples from the time of the compression slices, but otherwise no processing proper. Other steps are:
** data ingestion (science, HK, ancillary, other?)
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* data ingestion (science, HK, ancillary, other?)
** construction of ToS in science data group
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* construction of ToS in science data group
** pointing interpolation
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* pointing interpolation
** construction of other TOI and ROI objects from AHF, ...
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* construction of other TOI and ROI objects from AHF, ...
  
 
== Level 2 ==
 
== Level 2 ==
  
 
(L2): this is where the data are processed from timelines into maps. The main processing steps are
 
(L2): this is where the data are processed from timelines into maps. The main processing steps are
** Timeline (or Time-Ordered Information = TOI) processing, which includes conversion from ADUs to engineering units (Volts), demodulation, deglitching, conversion from engineering to physical units (Watts), removal of known systematic effects (non-linearities, 4K lines, Jumps, ring flagging), removal of the instrumental signature (time transfer function)
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* Timeline (or Time-Ordered Information = TOI) processing, which includes conversion from ADUs to engineering units (Volts), demodulation, deglitching, conversion from engineering to physical units (Watts), removal of known systematic effects (non-linearities, 4K lines, Jumps, ring flagging), removal of the instrumental signature (time transfer function)
** map-making: projecting the TOIs onto all-sky maps, etc. etc,
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* map-making: projecting the TOIs onto all-sky maps, etc. etc,
** Noise Estimation
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* Noise Estimation
** Focal Plane Reconstruction
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* Focal Plane Reconstruction
** Diffuse Calibration
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* Diffuse Calibration
** Systematic Effect Removal
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* Systematic Effect Removal
*** [[ Selected Systematic Effects | Selected Systematic Effects ]]
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** [[ Selected Systematic Effects | Selected Systematic Effects ]]
  
 
== Level 3 ==
 
== Level 3 ==

Revision as of 10:21, 23 September 2012

The HFI DPC has been organized into three different "Levels": 1, 2 and 3.

Level 1[edit]

The (L1): which consists in receiving the telemetry and ancillary data files and ingesting them into the DPC database. This involves decompressing, in some cases changing data formats, computing the time of individual data samples from the time of the compression slices, but otherwise no processing proper. Other steps are:

  • data ingestion (science, HK, ancillary, other?)
  • construction of ToS in science data group
  • pointing interpolation
  • construction of other TOI and ROI objects from AHF, ...

Level 2[edit]

(L2): this is where the data are processed from timelines into maps. The main processing steps are

  • Timeline (or Time-Ordered Information = TOI) processing, which includes conversion from ADUs to engineering units (Volts), demodulation, deglitching, conversion from engineering to physical units (Watts), removal of known systematic effects (non-linearities, 4K lines, Jumps, ring flagging), removal of the instrumental signature (time transfer function)
  • map-making: projecting the TOIs onto all-sky maps, etc. etc,
  • Noise Estimation
  • Focal Plane Reconstruction
  • Diffuse Calibration
  • Systematic Effect Removal

Level 3[edit]

(L3): This is where the data in the form of frequency maps are converted to component maps, and where the maps used to create power spectra of the CMB. Much of this is done in common with the LFI, and is further described

Level 4[edit]

Level 4 is the "Archive Level".

Level S[edit]

Level S is the so-called "Simulation Level".

(Planck) High Frequency Instrument

Data Processing Center

House Keeping

Time of Sample

Ring-Ordered Information (DMC group/object)

Attitude History File

EMI/EMC influence of the 4K cooler mechanical motion on the bolometer readout electronics.

Cosmic Microwave background

(Planck) Low Frequency Instrument