PLANCK Calibrated Time Ordered Data

• Tag (removal) of non-science data, bad & corrupt data - for HFI this includes cosmic ray removal
• Calibration data base (calibration history and parameters files - absolute and relative) and alogrithms are applied to the unpacked data set.
• Determine, characterized, and remove instrument signatures. This includes simple filtering such as the phase shift introduced by time constants of the detectors and amplifiers and alignment of the real times with the data samples. There are potentially more complicated items such as removal of any cross-talk (hopefully this is minimal)
• More sophisiticated filtering and baseline removal
  • The goal here is to have a time-orderd data set which is calibrated into physical units, has the significant features of the instrument such as baseline drift and environmental sensitivities removed. This calibrated data set is the input to the map making and further downstream analysis. This stage is usually only created from the raw data stream by the DPC and only through a very limited number (e.g. 2 or 3) passes because of the very large amount of effort and specific knowledge required.