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  1. Nortek Support Center
  2. Frequently Asked Questions
  3. Data quality control and post-processing

Data quality control and post-processing

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  • What is phase wrapping and phase ambiguity? How can I solve it?
  • What do the SeaReport Quality Codes mean?
  • What is the AST Quality parameter, and what can I use it for?
  • What is the difference between AST and LE?
  • Does "white-capping" cause problems for the AST beam?
  • How can sediment affect my measurements?
  • How does the AWAC estimate ice thickness?
  • What do the Error and Status codes mean?
  • What is the difference between the raw and the processed AST time series?
  • How does Storm calculate the Signal to Noise ratio (SNR)?
  • Why does my AWAC AST appear to miss the surface and have bad/missing detects?
  • What do the Wave Error Codes mean?
  • What is the difference between Hm0 and Hs?
  • What types of quality criteria are made when checking the AST data?
  • How can I identify reflected waves in my processed data?
  • Why is there a difference between mean pressure and the mean AST?
  • When calculating the wave heights, does the instrument/software make corrections for the mean current speed?
  • Is the Doppler noise constant with range?
  • Can I estimate sediments, SSC or plankton from acoustic backscattering?
  • How can I correct clock drift?
  • How is a coordinate transformation done?
  • Is it possible to post-process data for speed of sound errors?
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