Echosounder Setup
There are common echosounder settings in the
[ECHOSOUNDER]
section. Check whether
minimum and maximum values correspond to your needs:
[ECHOSOUNDER]
MIN_DEPTH_M=0.5
MAX_DEPTH_M=20
These values are used to bound valid echosounder depth values. When the depth value is out
of the limits, the operator will be notified.
Another parameter to be set is the length of the echosounder cable:
[ECHOSOUNDER]
CABLE_LENGTH_M=0
This parameter is set to zero by default. If set to the value greater than zero, it is used to
determine whether the echosounder is immersed in water. When the drone altitude becomes
lower than the cable length, it means the echosounder is immersed in water.
Also, the cable length parameter is used to find the True Depth value. True Depth is a
calculated value of depth from the surface resulting from the echosounder’s value and the
current altitude using the specified cable length parameter.
The True Depth value is recorded as a separate column in the position log file and
echosounder NMEA log (see
). Also, this data is sent to the PC application.
The first samples of the trace in SEG-Y log (see
echosounder is immersed in water. Zeros number (N) is defined from the difference between
the True Depth value (TDepth, m) and the depth measured with the echosounder (Depth, m)
taking into account the speed of sound (1500 m/s) and set sampling rate (Rate, Hz) by the
formula:
N = 2 × (TDepth - Depth) × Rate / 1500
Echologger ECT400 Setup
1. Set
ECHOLOGGER_ECT
item to
true
in
[PAYLOADS]
section:
[PAYLOADS]
ECHOLOGGER_ECT=true
2. Set the
MAX_SENSOR_ANGLE_DEG
parameter in the
[ECHOLOGGER_ECT]
section for
data filtering by echosounder tilt while recording. Set to 90 degrees for disabling.
Echosounder Setup
UgCS SkyHub User Manual
Copyright © 2019—2021, SPH Engineering
66
Revision 5 • November 2021
