innomar SBP smart - Page 198

198 User’s Manual INNOMAR Parametric Sub-Bottom Profilers / SESWIN
198 Innomar Technologie GmbH (2023-01)
Special “deep-15” SESWIN Settings
Home Menu: Transmit SBP (Transmit Pulse Settings)
The Innomar “deep-15” SBP can transmit
 parametric CW pulses (1 – 4 kHz; “HF” c. 15 kHz),
 linear CW pulses (12, 15, 18 kHz),
 linear and parametric LFM chirp pulses:
o Lin CH short: 12 – 18 kHz (linear) / 10ms
o Lin CH long: 12 – 18 kHz (linear) / 20ms
o Para CH: 1 – 4 kHz (parametric) / 20ms
Notes:
 The values given are the centre or sweep-frequency limits, not
the 3dB bandwidth.
 Parametric CW pulses with “LF Pulses” set to “1” are Ricker
wavelets.
 In the linear CW and Chirp pulse modes the “LF Gain” is disabled
since the used frequency range is considered as HF (same
frequency band as the parametric “HF”)
Home Menu: Depth / Depth Check
There are three depth values shown:
 the HF and LF bottom tracks (as with all other models),
 the result of a special water-depth check, see below.
In deeper waters mostly “multi-ping” mode will be used to ensure a high ping rate. This greatly
improves the data quality, but there is a potential risk to lose the true seabed and following a
multiple return instead. To prevent this, there is the possibility to check if the bottom track is still
correct by transmitting a special sound pulse, that can be clearly distinguished from all other
sound pulses and noise picked up. After receiving the bottom return from this test pulse, the result
is shown as “CHK” depth value.
To invoke this water depth check, there are two options:
 a periodic automatic check at a certain time interval and
 a manual check by pressing the “Check Depth” button.
The automatic check interval is
set in “System Setup – General –
Special Transmit Modes”.
The interval should fit the
expected water depth range,
preferably use larger intervals. A
shorter interval will detect fast
changes on slopes, but might
interfere with other acoustic
systems. If switched off, you can
still use the manual check.
The manual depth check is started by pressing the “Check Depth” button. This starts
a count-down and the result is shown after approx. 20 seconds.
If transmitters are off, then an info message is shown to turn on transmitter first.
parametric
CW pulses
(HF: 15 kHz)
linear
CW pulses
LFM chirp
pulses