Difference between revisions of "NPIPE preprocessing"

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[[File:Preproc_lfi_-_png.png|800px|frameless|left|LFI preprocessing subpipeline]]
 
[[File:Preproc_lfi_-_png.png|800px|frameless|left|LFI preprocessing subpipeline]]
[[File:Preproc hfi.png|800px|frameless|left|HFI preprocessing subpipeline]]
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[[File:Preproc_hfi.png|800px|frameless|left|HFI preprocessing subpipeline]]
 
[[File:Preproc hfi optical.png|800px|frameless|left|HFI preprocessing subpipeline for optical bolometers]]
 
[[File:Preproc hfi optical.png|800px|frameless|left|HFI preprocessing subpipeline for optical bolometers]]

Latest revision as of 11:15, 22 June 2021

NPIPE preprocessing applies to one detector at a time. It begins with loading the entire detector data set into memory and ends with writing the processed data into a file. While in memory, raw timelines are approximately calibrated, jump-corrected and flagged. Pointing periods (rings) with anomalous statistics are flagged as unusable. LFI preprocessing requires two iterations: the first iteration optimizes the sky-load differencing parameters and the 1-Hz spike templates; and the second iteration applies these and other corrections. HFI processing includes cosmic-ray glitch removal and bolometric transfer-function deconvolution.

Below are schematics of both sub pipelines. The diagrams are reproduced from A&A 643, A42 (2020) and the numbers in brackets refer to section numbers in that paper.

LFI preprocessing subpipeline
HFI preprocessing subpipeline
HFI preprocessing subpipeline for optical bolometers

sudden change of the baseline level inside a ring

(Planck) Low Frequency Instrument

(Planck) High Frequency Instrument