Gå til hovedinnhold


Figure 19. Example EC150-3C echosounder echograms. Herring is resolved as individual target at the top outskirts of the layer observed at 60-150 m depth in Kvænangen fjord. Demonstration of advantage of rather narrow, (2.5) beamwidth to resolve individual targets at range. The broad band pulses of “fast” (upper panel) and “slow” (middle panel) taper were used. The narrowband pulses of 1 ms duration were also tested (lower panel).
Figur file_html_288bfc5ebe6f2c92.png