Analysis of planar array of 64 monopoles for over-the-horizon radar – Manifold calculations and null-steering performance study

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Authors
  1. Henault, S.
Corporate Authors
Defence Research and Development Canada, Ottawa Research Centre, Ottawa ON (CAN)
Abstract
The particular challenges of a 64 planar monopole antenna array used in an over-the-horizon radar (OTHR) and error mechanisms leading to auroral clutter suppression deterioration are evaluated. A comprehensive methodology is presented to calculate the array manifold for arbitrary azimuth, elevation and polarization. The calculated manifold is then available to calibrate the experimental array, and is used in this report to analyze null-steering performance for different ground types and signal scenarios. Clutter rejections exceeding 40 dB are found to be possible in transmission at all frequencies, and increase with frequency, but require a highly accurate manifold. The manifold and performance are found to be very sensitive to ground properties, and techniques are proposed to mitigate the impact of manifold uncertainties. Adaptive array processing is also considered with an emphasis on the presence and strength of the target signal in the training data as well as correlation between the target signal and auroral clutter. Practical considerations relative to power handling and nonlinear effects in high power amplifiers are studied.

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Keywords
DRDC Scientific Report;example document
Report Number
DRDC-RDDC-2018-R233 — Scientific Report
Date of publication
01 Jan 2019
Number of Pages
96
DSTKIM No
CA048858
CANDIS No
809647
Format(s):
Electronic Document(PDF)

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