The variables measured

The variable measured in the acoustic experiments is the voltage on the electroacoustic receiver, proportional to the pressure of the ultrasonic wave detected in the water column. This parameter allows to determine different acoustic properties of the sea medium like backscettreing strength, reflection coefficient, noise intensity etc.

Recoreded parameters:

AKU_ES - Echo Signal - a total signal received on the hydrophone, sampled with frequency sufficient for detection of Doppler's effects and higher harmonics (measurements of sea noise and nonlinear effects)
AKU_ESE - Echo Signal Envelope - low frequency component of the detected signal (echosounding of the water column and sea bottom).

The file include header and main data set:

HEADER:

Latitude
Longitude
Date (day, month, year)
Time (hour, minute, second)
Type of echosounder
Frequency of echosunder, gain, TVG, range
Depth of transducer, power, pulse length
A/D converter
Number of first & last sample in echo
Min & max depth of sampling
Sound speed
Number of recording echoes
Number of nonrecording echoes (pause)

MAIN DATA SET:

(number of echoes) x (number of samples) voltage

The variables measured

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