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Spurious response in HIFI data

Spurious response in HIFI data. What we know, what we don’t, and what to look for. Spur pathology in gas-cell observations. Spur detection and cataloging.

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Spurious response in HIFI data

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  1. Spurious response in HIFI data What we know, what we don’t, and what to look for.

  2. Spur pathology in gas-cell observations

  3. Spur detection and cataloging • Based on work with the gas-cell data, we wrote an automated algorithm to search for spurs in cold-load data of all HIFI observations, which include: • SOVT-2 AOT observations • Tsys survey • Gas-cell observations. • Eventually, this will be part of the standard pipeline (level 0->0.5). • In a nutshell, the algorithm examines the second-derivative of the cold-load data and looks for spikes. It also looks for saturated yet narrow (< 40 MHz) regions of the spectrum. Secondly, it checks to see if the spur candidate is also seen in the other polarization.

  4. Spur detection and cataloging

  5. 551GHz water line concern

  6. To-do and closing thoughts In addition to having the routine in the standard pipeline, the output has to be used by the SPG to enable trend analysis. Spur positions will change when we get to space. Spurs can also be moved by hardware table changes in flight. HSPOT will provide a warning to the user when a known spur is near the LO requested.

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