Two-dimensional adaptive processing for ionospheric clutter mitigation in high frequency surface wave radar

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Authors
  1. Riddolls, R.J.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
Abstract
High Frequency Surface Wave Radar (HFSWR) is a technology used for over-the-horizon detection of ocean vessels. This radar exploits the diffraction of electromagnetic waves around the curved surface of the earth. To minimize the attenuation of the diffracted waves, the radar must operate at frequencies in the lower part of the high frequency (HF) band. However, radar signals at these frequencies also reflect from the earth’s ionosphere, which leads to radar clutter at ranges beyond 200 km. The linear broadside receive arrays used by conventional HFSWR cannot filter out this clutter as the arrays do not have any resolving power in elevation angle. Reported here are theoretical and experimental investigations of the clutter suppression capability of one- and two-dimensional HFSWR adaptive processors. Three configurations are compared: one-dimensional spatial adaptive processing, two-dimensional spatial adaptive processing, and space-time adaptive processing. In all cases the number of adaptive degrees of freedom is 16. It is found that the best results are achieved by two-dimensional spatial adaptive processing, where a processing gain of up to about 20 dB can be achieved.

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Keywords
SKY WAVE;RADIO;IONOSPHERE;PLASMA;IRREGULARITIES;ANTENNA;ARRAY;HFSWR (High Frequency Surface Wave Radar);Adaptive Processing Algorithms
Report Number
DRDC-OTTAWA-TM-2008-319 — Technical Memorandum
Date of publication
01 Dec 2008
Number of Pages
32
DSTKIM No
CA032508
CANDIS No
531668
Format(s):
Electronic Document(PDF)

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