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Ground Penetrating Radar (GPR) are widely used to probe the sub-surface. Recently, various time-frequency analyses has been proposed to discriminate buried land mines from other clutter objects and thus reduce GPR false alarm rates. This paper examines the possibility for discrimination and assesses it experimentally. The approach uses the Choi-Williams time-frequency transform to analyse ultra-wideband...
This paper presents recent developmental work on a low-profile ultra-wideband disk-loaded monopole. A novel single port feed configuration is investigated were the RF power is split and circulated by a branched transmission line network. This is composed of a balanced stripline and capacitive coupling network which both excite a metallic disk radiator. Measurements and computations show that the impedance...
This paper contributes to the validation and experimental determination of the complex permittivity and permeability of microwave materials intended for use with antennas. The two-port microwave scattering coefficients were measured for samples of the materials in closed coaxial and rectangular waveguide systems. A non-iterative and stable version of the Nicholson Ross and Weir transmission reflection...
This paper presents the design of a low profile retrodirective surface composed of a frequency selective surface (FSS). The principle of operation of re-radiation and scattering from the array surface is outlined. A full-wave analysis of individual FSS unit cells and the assembled reflect array is performed to better understand and design the reflector. A commensurate array of unit cells with progressive...
A circular polarisation frequency selective surface converts linearly polarised waves into circular polarised ones or reflects one sense of circular polarisation and transmits another. While known designs made with meanderlines often employ several cascaded surfaces with many interconnects; the design feature reported here is a single planar surface of very closely arrayed metallic meanderline loaded...
Aim • A method to identify landmines in various burial condition. Scope • Develop an autonomous UWB ground penetrating radar able to measure bi-static two port S-parameters. • Develop processing to reduce ground effects noise and clutter. • Identify and adapt variants of the Hidden Markov model capable of being trained to detect and identify a range of landmines.
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