Adaptive Processing of RADARSAT-1 Fine Mode Data: Ship Parameter Estimation

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Authors
  1. Vachon, P.W.
  2. Dragosevic, M.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
Abstract
The Chip-based Adaptive synthetic aperture radar (SAR) Processor (CHASP) was developed to facilitate the precision processing of airborne SAR data of moving ship targets. CHASP has been extended to support the processing of RADARSAT-1 (R-1) Range Compressed (RC) data and applied to a set of 121 known ships in R-1 Fine mode data. It is shown that, for R-1 Fine mode data, CHASP-like algorithms can provide more ship information than can be deduced from image analysis alone. Based upon comparison of the ship residual frequency with the Doppler centroid of the background clutter, the ship radial speed can be estimated to within ±2 m/s. Azimuth travelling ships are the most difficult cases for length and speed estimation, but azimuth travelling ships can be readily recognised through a high modulation index of the power envelope in azimuth. The ship radar cross section (RCS) is well estimated for both range and azimuth travelling ships. Unfortunately, processing experiments could neither prove nor refute the expected SAR resolution dependence of the measured ship RCS. Single look complex (SLC) data could also be used as a starting point for CHASP-like analysis. However, this would introduce additional complexity since the internal details of the SAR processor must be completely known. In general, it is recommend that adaptive ship data analysis start from RC data. The most important outcome of this work is that, for R-1 Fine mode data, frequency tracking of the ship signature can

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Report Number
DRDC-OTTAWA-TM-2007-053 — Technical Memorandum
Date of publication
01 Mar 2007
Number of Pages
98
DSTKIM No
CA029268
CANDIS No
527521
Format(s):
CD ROM

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