PACS photometer pipeline overview. Maynooth, September 2010. Bruno Altieri (ESA/HSC). Two pipelines : photProject: High-pass filter + projection MADmap Common pipeline from L0 to L1 with branching to L2. HCSS 2.0: MADmap removed from HSC pipeline
Maynooth, September 2010
Bruno Altieri (ESA/HSC)
photProject: High-pass filter + projection
Common pipeline from L0 to L1 with branching to L2.
HCSS 2.0: MADmap removed from HSC pipeline
Too low quality maps (as cross scan not handled)
Plan: re-introduce in HCSS 5.0 once HCSS-9361 is implemented to handle cross-scans.pipelines current status
Sequence to apply to PACS photo data cube (frames)
Level 0 to 1
Level 1 to 2
Map-making technique which will produce maximum likelihood sky maps from time ordered instrument data.
MADmap uses the data model:
d = A(p,t) * S(p) + n(t),
d = detector readout, A=pointing matrix, p=sky pixel, S=signal, n=noise and t is time (or index).
For all readouts, all detectors, the set of linear equations is too large to invert; thus, conjugate gradient method is used to find the best least-squares fit to the data, given a noise model n(t).
Level 1 Processing*
2nd level deglitching
Pixel-to-pixel, module to module and global drift corrections.
* But see caveat about deglitching.
MADmap with Scan+x-scan
MADmap with Single scan
On-going work with HCSS-9361 to handle multiple scans