The LFI DPC

Overview

The LFI DPC is organized into different "Levels":

• Level-1, which scope is principally to analyze the data in a daily base and trasforma the telemetry packets in to timelines in enginnering value.

• Level-2, start with the output of the Level-1, apply the differetiation, combine the diode and remove at timeline level the systematics that has been identified. It is too responsible to compute the instrument attitude and then compute the detector pointing. Scientific timelines are then calibrated in K_CMB unit and are the input to the MapMaker. Maps at frequency leveland varios combination are the principal output .

• Level-3, is a COMMON level between the DPC , it takes as input the maps produced at Level-2 and then transforms these maps at specific frequencies into more scientific products, like catalogues, maps and spectra of astrophysical components.

• Level-S, is the COMMON simulation software used to validate all the algorithms used in the process.

The description of the pipeline applied for the "Early Planck results" can be found at the following link http://www.aanda.org/index.php?option=com_article&access=standard&Itemid=129&url=/articles/aa/abs/2011/12/aa16484-11/aa16484-11.html

data is

Level 1: From packets to TOI

The first processing level of the LFI DPC is the so called Level 1. The source data of the Level 1 software includes:

• raw housekeeping telemetry packets retrieved from different satellite subsystems: the LFI instrument, the Sorption cooler, the HFI instrument and the Central Data Management Unit (CDMU).
• the LFI raw scientific telemetry
• Additional auxiliary data provided by the MOC and the Flight dynamics:
  • The Attitude History File (AHF)
  • Time correlation data (time correlation coefficients and time couples)
  • The Sorption cooler out of limit data

Scope of the Level-1 is to

Only a subset of the raw housekeeping telemetry packets is daily processed and converted into TOIs, i.e. those relevant to the LFI DQR production and the estimation of the LFI instrument systematic effects.