ADAPTIVE SUPPRESSION OF INTERFERENCE IN HF SURFACE WAVE RADAR USING AUXILIARY HORIZONTAL DIPOLE ANTENNAS

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Authors
  1. Leong, H.W.H.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
This report presents the results of a study to evaluate the effectiveness of an adaptive technique using horizontal dipoles to suppress the skywave interference in HF Surface Wave Radar (HFSWR). Four auxiliary horizontal dipole antennas, configured in the form of two separate crosses, were used to form an adaptive system with the vertically polarized antennas (VPA) of a HFSWR system. The outputs of the horizontal dipoles were correlated with the summed output of the VPAs to cancel the interference component in the output of the VPAs. Two slightly different methods were used in the estimation of the correlation coefficients. The first method used the samples at the far ranges of the radar, and the second method used the samples in the range bins close to the range bin selected for the interference suppression. With the first method, the interference-plus-noise power (INP) was reduced by up to 13 dB, and the Bragg-to-interference-plus-noise-ratio (BINR) was increased by up to 21 dB. With the second method, the INP was reduced by up to 17 dB, and the BINR was increased by up to 25 dB. In both methods, we compared the effectiveness of the adaptive technique using one, two or four horizontal dipole antennas. As expected, we found the technique to be most effective when all four horizontal dipoles were used.
Keywords
HFSWR (High Frequency Surface Wave Radar);Interference suppression;Auxiliary Horizontal Dipole Antenna;Sample Matrix Conversion Method;Fixed Window Method;Sliding Window Method
Report Number
DREO-1336 — Technical Report
Date of publication
01 Sep 1998
Number of Pages
62
DSTKIM No
99-00219
CANDIS No
510092
Format(s):
Hardcopy;Document Image stored on Optical Disk

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