1.83. FreqRanges

Full Name: herschel.hifi.pipeline.generic.FreqRanges
Type: Java Class - Java Class
Import: from herschel.hifi.pipeline.generic import FreqRanges

HIFI/Pipeline/Level 1 Pipeline


Product containing the measures for frequency drifts potentially occurring during an observation.

For each group ob datasets in the original timeline product (defined by consistent LO settings) a {@link TableDataset} is constructed which contains the per channel frequencies for the comb measurements and the drift measure computed for sub-sequent frequency grids.

The drift measure is calculated by

  • first, computing for each subband the average difference between corresponding channel-frequencies of the sub-sequent comb measurements and

  • second, taking the maximum over the absolute values of the per subband measures computed in the first step.

  • Finally, this distance is divided by teh distiance in observation time.

The drift measure is reported in units Hz / sec.

See also