Reson SeaBat 7125 ROV, Operator'S Manual

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ACTIVE SONAR USAGE
SeaBat 7125 ROV Operator‟s Manual
Page 85 May 30, 2011
Version 3
6.2 Enhancing the Sonar Image
6.2.1 Pulse Length and Image Resolution
For a given power setting, a narrower pulse length will provide a higher resolution at a
shorter range. A wider pulse length will provide better range but a lower resolution
image.
In certain conditions, for example in turbid waters, the narrower pulse length may not
operate well. In such circumstances, the wider pulse length may give better short-range
performance. This may also be achieved by changing from higher to lower frequency
operation.
For instructions on how to adjust this setting, see
section 5.7.1.5 Set the Pulse Length .
6.2.2 Transmit Power OFF
If the Power is set to OFF, the system will not ping, but it will continue to receive data
provided that the max ping rate is not set to 0 (see also
section 5.7.1.3 Set the Maximum
Ping Rate (Max Rate) ).
With the transmit power OFF, the sonar system will act as a passive sonar by only
receiving data. This is a feature that is very useful for monitoring the ambient water in
order to assess the level of background noise and interference from the vessel itself.
For instructions on how to adjust this setting, see
section 5.7.1.2 Set the Transmit Power
(Power) .
6.2.3 Lower Ping Rate
In some instances it may be beneficial to force a lower ping rate than the normal rate
associated with a particular range.
Examples of this would be instances when the vessel is moving at a very slow rate, and
the operator wants to reduce the quantity of data generated; or when the sonar is
operating in a high-reverb environment where echoes of the previous ping are
contaminating the current ping.
For instructions on how to adjust this setting, see
section 5.7.1.3 Set the Maximum Ping
Rate (Max Rate) .