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WCR Data Status

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Terminology used to acknowledge data quality for each data file reported under Flights information.

  • SPIKES are defined as short lasting (less than a few secs), large excursions in positive or negative direction (higher than 2-3 dB).
  • ELEVATED NOISE (including short spikes) is defined as occasional change in the mean noise that exceeds 2-3 dB and lasts from fraction of a second to more than a minute. It is usually associated with ground hits and/or multi-trip echoes. It is observed for side looking mode only.
  • NOISE JUMPS/SPIKES (up to 10-20 sec). Probably some sort of short interference not necessarily in both channels and in some cases associated with the mirror position change or A/C radio communications at freqs close to 120MHz
  • NOISE DRIFT is up to 2dB slow drift in the noise channel; likely due to drift in the receivers gain. Usually it does not exceed 0.5 dB.
  • BAD DATA refer to corrupted data or improbable data behavior. 
  • DATA SHIFT means that all data channels are shifted one range gate to the right for one or both of the DSPs.
  • DATA GAPS: gaps between profiles exceeding several times the average time interval between profiles.
  • TIME STAMP ERROR: known fixed shift in the time stamps.
  • TIME JUMPS: sync problem in the time which results in time stamps jumps of up to 2 sec. Noticed only in the beginning of the first file for less than 10-15 min.
  • DATA DISCONTINUITY: unexpected jumps in reflectivity occurring thru all range gates from one profile to another.

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