Difference: HipeWhatsNew8x (84 vs. 85)

Revision 852012-01-04 - CarolynMcCoey

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META TOPICPARENT name="HipeWhatsNew"

What's new in HIPE 8

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 HIFI

  • Improved spectral cubes: Spectral cubes from mapping observations after OD 835 gridded using actual scan line and readout used in observation, earlier maps use a better approximation.
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  • Improved band 6 and 7 data: Improvements in the level 1 pipeline give noticeably improved noise and baseline quality of all observations performed in bands 6 and 7.
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  • Improved band 6 and 7 Spectral Scan data: Improvements in the level 1 pipeline give noticeably improved noise and baseline quality of Spectral Scan observations performed in bands 6 and 7.
 
  • Standing waves: For strong continuum sources an optional pipeline step, doFilterLoads, can reduce or eliminate standing waves from the hot and cold loads
  • Calibration version: The calibration version used by the pipeline is now included in the metadata of all calibrated products. You can also select the calibration version to be used by the pipeline (command line only).
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Level 1 Pipeline

  • New (optional) pipeline step allowing smooth band pass to eliminate standing waves: doFilterLoads. This is an alternative calibration scheme for strong continuum sources.

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  • Substantial refactoring of CheckFrequencyGrid to correct assumptions made about the sequence of on-, off- and hc-datasets. This primarily affected HEB band data and resulted in unnecessary Quality Flags being raised. This correction produces a noticeable improvement in the noise and baseline quality of all observations performed in bands 6 and 7.
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  • Substantial refactoring of CheckFrequencyGrid to correct assumptions made about the sequence of on-, off- and hc-datasets. This primarily affected HEB band data and resulted in unnecessary Quality Flags being raised. This correction produces a noticeable improvement in the noise and baseline quality of observations performed in bands 6 and 7.
 

Level 2 Pipeline

  • Sideband gains coefficients added to metadata.
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  • doGridding now uses AOT parameters in the meta data (such as beam size, map size, and - for observations after OD 835 - readout and line separations) to create cubes that reflect how the observation was carried out.
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  • doGridding now uses AOT parameters in the meta data (such as beam size, map size, and - for observations after OD 835 - readout and line separations) to create cubes that reflect how the observation was carried out. In addition a box filter (previously a Guassian) is automatically used for greater than Nyquist sampled DBS Raster maps.
  Note that for the needed meta data to be present, the observation must be pipelined with HIPE 8 after the level 0 pipeline step doUplink has been run on the HTP.

Maps older than OD 835 will not have the readout and line spacings in the the meta data (this will happen with HIPE 9) instead doGridding calculates an approximate pixel size based on other meta data.

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Other changes include:
    • the GUI now modifies filter parameters in connection with changes to pixel size entered in the GUI
    • introduction of a flyAngle parameter to allow the easy creation of rotated maps
    • a box filter is automatically used for greater than Nyquist sampled DBS Raster maps
 

HIFI Products

 
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