Simrad ES80 Reference Manual page 304

Simrad ES80 Reference Manual
Sample Interval
The information from each ES80 transducer is a continuous flow of analogue
data. In signal processing, sampling is the reduction of this continuous signal to a
discrete signal.We convert a sound wave (which is an analogue continuous-time
signal) to a sequence of samples (which is a discrete-time signal). The sample rate
is the average number of samples obtained in one second. The sample interval is
1/sample rate to allow readout in time (normally milliseconds).
Start/End Frequency
This setting is controlled in the
and
End Frequency
the parameters for start and end frequencies are unavailable, the transducer used
on the relevant channel does not support wideband transmissions. In order to use
the frequency sweep ("chirp") functionality, you must use frequency modulated
(FM) pulses.
Power
This setting is controlled in the
in the
Normal Operation
measured in Watts. You can change the output power manually. Output power is
limited either to the maximum rating of the transducer, or the maximum rating of
the transmitter, whichever is the smallest.
Slope
The value identifies how fast the output power in each transmission ("ping")
Slope
goes from 0 to maximum. The value (in %) indicates the amount of the pulse
duration that is spent during this increase. For example, if the
50%, it means that half the duration of the "ping" is spent building up the power
to maximum.
The is also commonly known as
Slope
automatic, while on scientific echo sounders you can adjust it manually.
Ping Rate
The phrase ping rate is used to describe the parameter that controls how often the
ES80 can or shall transmit acoustic energy (a "ping") into the water. The ping rate
is normally limited by the maximum range settings. It will also be dependant on
hardware issues. This may be, for example, how fast your Processor Unit can
handle the information from each ping, how fast your system communicates with
external peripherals, or how long time the system uses to save data.
The ping interval ( 1/ping repetition frequency (PRF)) is the ping rate measured in
time between each transmission.
This information is also found in the
You open the
BITE
302
Normal Operation
parameters are used to set up a frequency sweep ("chirp"). If
Normal Operation
dialog box displays the transmitter's output power
Ramping
BITE
dialog box from the
dialog box. The
dialog box. The
. In the ES80, this setting is
(Built-In Test Equipment) dialog box.
menu.
Setup
Start Frequency
parameter
Power
value is
Slope
406273/C