About fish track detection

Fish track detection identifies groups of single targets (echoes) that show a pattern of systematic movement. The targets grouped into a fish track are assumed to have been generated by a single object moving through space. Fish track detection configurations store reusable sets of detection settings for different data or analysis requirements.

Echoview's α-β Fish Tracker implements the fixed-coefficient filtering method presented by Blackman (1986).

Echoview offers two fish track detection algorithms:

The 2D algorithm uses the range and time of the single targets and disregards angle information.
The 4D algorithm uses the range, angular position within the beam, and time of the single targets. It requires single target data containing angle information.

Warning: Single targets are positioned on echograms using Target_on_axis_depth, not Target_true_depth. The depth-related calculation Fish_track_change_in_depth uses Target_true_depth when it is available; otherwise, Target_on_axis_depth is used. See About single target depths before interpreting depth-related information. The fish tracking algorithm uses neither Target_on_axis_depth nor Target_true_depth; it operates entirely in range space.

Note:

Compare with region tracking. Region tracking links detected regions over successive pings, whereas fish track detection groups single targets into fish track regions.

About fish track detection

See also