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- Title
Investigation of a 256‐Monopole Transmit Antenna Array for Over‐the‐Horizon Radar in Canada.
- Authors
Henault, Simon; Riddolls, Ryan J.
- Abstract
A 256‐monopole planar array is investigated as a potential transmit antenna covering the entire 3‐ to 18‐MHz band in an over‐the‐horizon radar (OTHR) operating at high latitudes in Canada. This array is relatively inexpensive, simple to build, and offers the azimuth and elevation resolutions necessary to defeat the auroral clutter which has traditionally limited the operation of OTHR at high latitudes. It is demonstrated that excellent clutter rejection ratios are possible with this antenna array and accurate calibration, but significant performance degradation occurs with calibration errors in particular in the lower portion of the operating frequency band. Various calibration approaches and error mechanisms are studied. A new approach combining multiple‐input‐multiple‐output (MIMO) radar techniques at lower frequencies and conventional transmit null steering at higher frequencies is proposed and evaluated. This approach enhances the robustness of the array to calibration errors while preserving the radar unambiguous range‐Doppler space across the operating frequency band. Key Points: For over‐the‐horizon radar (OTHR) to be effective in Canada, the auroral clutter needs to be suppressed. This can only be accomplished by careful design of the antenna and array processing techniquesA comprehensive analysis of clutter rejection performance considering various error mechanisms in the context of an OTHR operating at northern latitudes is carried out for the first timeThe combination of MIMO radar and conventional null steering is proposed and allows the use of a single OTHR array of simple construction to cover the entire 3‐ to 18‐MHz band
- Subjects
CANADA; MONOPOLE antenna arrays; MIMO radar; AZIMUTH; ARRAY processing
- Publication
Radio Science, 2019, Vol 54, Issue 10, p888
- ISSN
0048-6604
- Publication type
Article
- DOI
10.1029/2019RS006868