Simrad EQ60 - Manual (Page 81)

Instruction manual
69
857-164342 / Rev.C
Absorption [dB/km] - This value describes the absorption of
sound in the water. The default values are computed according
to Francois and Garrison, Journal of Acoustic Society,
December 1982. The most important environmental variable
affecting this parameter is found in the Environment dialogue
box.
Bandwidth [Hz] - This is the resulting system bandwidth of the
analogue and digital filters in the echo sounder receiver. The
bandwidth is a function of the selected pulselength at a given
frequency.
Sound velocity [m/s] - The speed of the sound through the
water varies with temperature, salinity and pressure. The
soundings provided by the EQ60 are compensated for this.
Sample interval [m] - This value is always 1/4 of the current
pulse length. In distance, the sample interval will be expressed
as (sound velocity multiplied with pulse length) divided by
eight.
Angle sensitivity - In order to convert the raw angle samples
into mechanical degrees for fore-and-aft and athwartship
directions, this parameter is required. It represents the ratio of
electrical degrees to mechanical degrees for the current
transducer. This ratio is not used with single beam transducers,
and the value is set to 0.
3dB beam width [degrees] - This value presents the 3 dB
beamwidth of the current transducer in the fore-and-aft and
athwartship directions. The value is estimated during
calibration. If no calibration takes place, the default value is
used.
Angle offset [degrees] - This is the offset angle from the
acoustical axis. The value is estimated during calibration. If no
calibration takes place, the value 0 is used.
Related topics
→
Transceiver Settings, page 114.