Kongsberg Simrad SN90 Reference Manual page 400

Simrad SN90 Reference Manual
loss of energy.
energy due to geometric spreading and absorption.
Ping-Ping Filter
The
Ping-Ping Filter
pings in order to remove unwanted noise and interference from the echo
presentation.
Pulse Type
The
Pulse Type
("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
Hyperbolic Frequency Modulated (HFM) and Linear Frequency Modulated (LFM)
transmissions.
Frequency
Use the
Frequency
modulated (FM) transmissions (pings) and the operating frequency for the
continuous wave (CW) pings. You can change the frequency in predefined steps
from a "start frequency" to an "end frequency".
Horizontal TX Sector
In a horizontal swath the SN90 system transmits with a maximum horizontal
opening angle of 160 degrees. Use the
opening angle - and thus the size - of the horizontal search sector (swath). This is
the physical area that is covered with each transmission ("ping").
Vertical TX Sector
The
Vertical Tx Sector
horizontal and vertical swaths.
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
is measured.
AGC (Automatic Gain Control)
The (Automatic Gain Control) function runs an automatic analysis of the
AGC
echo strength.
RCG (Reverberation Controlled Gain)
The (Reverberation Controlled Gain) function removes unwanted
RCG
reverberation from the bottom and or from the sea surface. This enhances
398
(Time Variable Gain) compensates for the loss of acoustic
TVG
analyses the historical information from previous consecutive
function allows you to select the "shape" of the transmitted pulses
function allows you to select the frequency range in the
function to specify the centre frequency for the frequency
function is used to change the vertical opening angle in
Range Projection
Horizontal Tx Sector
function defines how this distance
function to control the
381294/E