NPIPE preprocessing

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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