170
381295/B
•
Ping-Ping Filter
The
Ping-Ping Filter
analyses the historical information from previous consecutive
pings in order to remove unwanted noise and false echoes from the SN90 presentation.
•
Pulse Type
The
Pulse Type
function allows you to select the "shape" of the transmitted pulses
("pings"). Different shapes have different qualities. Which pulse type to use depends
on the current environmental conditions, your range to the target(s) and the type and
speed of the target(s) you are observing.
•
Bandwidth
The
Bandwidth
function allows you to select the frequency range in the Hyperbolic
Frequency Modulated (HFM) transmissions.
•
Frequency
The
Frequency
function allows you set the centre frequency for the Hyperbolic
Frequency Modulated (HFM) and Linear Frequency Modulated (LFM) transmissions
(pings), and the operating frequency for the Continuous Wave (CW) pings.
•
Horizontal TX Sector
The SN90 transmits in a swath with maximum horizontal opening angle 160°. By
means of the
Horizontal Tx Sector
function, you can change this opening angle to 90,
120 or 160°.
•
Vertical TX Sector
The SN90 transmits in a swath with maximum vertical opening angle 160°. By means
of the
Vertical Tx Sector
function, you can change this opening angle to 80 or 120°.
•
Range Projection
The distance to a target located anywhere in the water column can be measured in two
ways. This can either be the horizontal distance to the target (
True
), or along the tilt
angle (
Slant
). The
Range Projection
function defines how this distance is measured.
•
AGC (Automatic Gain Control)
The
AGC
(Automatic Gain Control) function runs an automatic analysis of the echo
strength.
•
RCG (Reverberation Controlled Gain)
The
RCG
(Reverberation Controlled Gain) function removes unwanted reverberation
from the bottom and or from the sea surface. This enhances the visibility of schools.
It may however also remove scattered fish from the presentation.
•
Noise Filter
The
Noise Filter
removes unwanted acoustic noise from the SN90 presentation. It
reduces the interference from other acoustic systems (sonars and echo sounders),
as well as the noise from the propellers.
Simrad SN90 Operator Manual
Содержание SN90
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