Simrad EY500, Instruction Manual

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Simrad EY 500
P3400/B
5
1 INTRODUCTION
1.1 GENERAL
The SIMRAD EY 500 scientific echo sounder is designed for biomass estimation
where portability and low power consumption is important. This high-
performance, portable scientific sounder system is the result of combining state-
of-the-art echo sounder technology with the latest achievements in personal
computers (PCs).
The EY 500 system basically consists of power source, transducer, the EY 500
transceiver, a personal computer (desktop, laptop, or notebook) and an optional
colour printer. The EY 500 transceiver is housed in a cast aluminium case
designed for the environment encountered in portable use. Emphasis has been
placed on simple installation and ease of operation. A variety of computer
choices is allowed by using standard Centronics parallel interface between
EY 500 transceiver and PC.
Typical applications for the EY 500 are:
Fish stock assessment in lakes, rivers and shallow waters
Fish behaviour studies (the split-beam method allows tracking and counting
of individual fish)
Monitoring biomass from buoys
Pollution monitoring
Dam surveillance systems
The collected data is processed on-line for generation of colour echograms and
tables giving fish densities in up to 10 depth layers. The echogram is presented
on the PC display and on an optional colour printer. A file system allows storing
of selected data for further analysis by means of the Simrad EP 500 Echo Post-
processing System. Sample data may also be stored on hard disk and replayed
off-line for easy regeneration or demonstration of survey echo data. A navigation
instrument may be connected to the PC serial port, and position data for logging
of the survey track can be combined with the measured echo data. Remote
control of the EY 500 and output telegrams through serial port are used for
online monitoring of acoustic data.
The EY 500 system includes substantial processing power. Bottom detection,
echo integration and target strength algorithms are carried out solely in
software. The concept used in the receiver design provides an instantaneous
dynamic range of 160 dB. At the same time the absolute amplitude measure-
ment accuracy is very high, and combined with a low self-noise this assures
correct measurement of all targets.