An evaluation of CHASP processing for ship speed and ship direction


  1. Potter, T.
  2. Dragosevic, M.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN);Terry M. Potter Consulting, St. Limoges, ON (CAN)
The Radar Data Exploitation Group at Defence Research and Development – Ottawa (DRDC Ottawa) has been acquiring polarimetric radar imagery for several years. Since 2003, the imagery has focused on ships and maritime targets. DRDC Ottawa is evaluating the utility of the information in polarimetric SAR for maritime surveillance. One of the tools developed for this evaluation is CHASP (Chip-based Adaptive SAR Processor). The main purpose of CHASP is to improve ship focus, but under the right conditions, it can also estimate the ship speed and the ship heading. DRDC Ottawa has a database of ships processed by CHASP under a variety of ocean conditions. The database is described. Ocean waves induce non-linear motions in ships and this creates errors in speed and heading estimates. The purpose of this project was to evaluate the overall accuracy of CHASP using several different ships under a variety of ocean conditions. The CHASP estimates were directly compared to known ground truth data using scatter plots. Scatter plots were created using Microsoft Excel. Built-in Excel functions were used to create the best fit lines, RMS errors and correlation coefficients. Since long ships should be less affected by ocean wave action, the ships were divided into long (>= 100 m) and short (< 100 m) populations. Scatter plots were made for cross-track and along-track velocity, ship heading and contrast change during ship focusing. The correlation is generally much better for long ships when es

Il y a un résumé en français ici.

PolSAR;CHASP;Radar Data Processing;Ship;Ship speed
Report Number
DRDC-OTTAWA-CR-2009-029 — Contractor Report
Date of publication
01 Jun 2009
Number of Pages
Electronic Document(PDF)

Permanent link

Document 1 of 1

Date modified: