ANALYSIS AND APPROXIMATION OF CROSSTRACK GAIN STRUCTURES IN SIDESCAN SONAR IMAGES

Authors
  1. Kropinski, M.C.A.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN);Barrodale Computing Services Ltd, Victoria BC (CAN)
Abstract
The topic of this report is the identification and approximation of crosstrack structures present in sidescan sonar images obtained during sea trial MINEX-87. Three methods were developed to approximate this structure: piecewise polynomial approximation, Langrangian interpolation, and polynomial fitting by least square error. In each method, one variable parameter was permitted to account for changes in water column depth. The best method, which was based on the assumption that crosstrack structure is directly proportional to water column depth, proved to be the least square polynomial approximation. In this case, an average of traces, whose water column had been removed by an appropriate change of variables, was found. The polynomial fitted to this average adjusted its shape according to changes in water column depth. The success of this approximation was then measured by its ability to eliminate crosstrack structure when removed from traces in an image.
Report Number
DREP-CRS-88-18 — Contractors Report Series
Date of publication
15 Nov 1988
Number of Pages
84
DSTKIM No
89-03390
CANDIS No
61291
Format(s):
Hardcopy;Originator's fiche received by DSIS

Permanent link

Document 1 of 1

Date modified: