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2019 EK 60 & EK 80 Calibration Report
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2019
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[PDF-10.55 MB]
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Alternative Title:EX-19-02: ROV and Mapping Shakedown
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Description:Calibration of the Simrad EK 60 echosounders on NOAA Ship Okeanos Explorer took place May 2019 in the Gulf of Mexico during cruise EX-19-02. Three EK 60 frequencies (18, 120, and 200 kHz) were calibrated at the pulse length of 1.024 milliseconds (ms) and max power for each frequency. The 18 kHz was calibrated at the additional pulse length of 4.096 ms. A 70 kHz wide band transceiver (WBT) was also calibrated at both the continuous wave (CW) and frequency modulated (FM) modes at 1.024 and 2.048, and 1.024, 2.048, 4.096, and 8.192 ms pulse lengths, respectively. The 38 kHz frequency was not successfully calibrated as it had very low detections of the sphere in three quadrants at the known target strength (a similar issue was documented in 2018). Further updates from the ship indicate that the 38 kHz transducer might have an impedance issue, and is already planned for replacement during the next drydock period with a newer version that supports FM pulses.
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Rights Information:CC0 Public Domain
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Compliance:Submitted
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