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Discovery

EM backscatter calibration service

Relative calibration to collect clean backscatter

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Calibrating the seafloor backscatter is a comprehensive procedure. Having the ability to display the calibrated seafloor backscatter during acquisition will assist in the efficient detection of objects during a survey and aid in the quick turnaround to produce a raw data product, e.g., a seafloor mosaic, that is as clean as possible because you do not have to worry about the changes in backscatter intensity relative to the various system modes.

Relative calibration

The physical installation of the transducers on the vessel has an influence on the result, which is why it is not possible to provide these values from the factory. Relative calibration, also referred to as normalization, ensures consistency between all measurements from one system or between systems, without a reference of the absolute backscatter level.

Calculation

The collected files are sent to Kongsberg Discovery Hydrographic Support for calculation of the backscatter offsets. Support will then provide a file with the resulting offsets that need to be applied to the EM processing unit to collect calibrated seafloor backscatter.

Minimize vessel time

Hydrographic Support will provide the user with a procedure to follow, aid the user in planning the survey lines needed for the respective EM system and assess the data quality to ensure that vessel time is used effectively. Contact your sales representative to schedule this service.

Key features

  • Data samples are adjusted for transmitter source level, receiver sensitivity, transmitter and receiver beam pattern, receiver gain, transmit pulse length and bandwidth, spherical spreading and frequency dependent absorption, incidence angle and vessel attitude
  • Real time calibration files are available for EM122, EM124, EM302, EM304, EM710, EM710 MKII
  • Post-processing files are available for EM204X series
  • This technique can be used to tune multiple platforms that collect data over the same reference area.

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