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The electromagnetic scattering of a plane wave by a penetrable (e.g., dielectric) or impenetrable (e.g., metallic) sphere concentric with a thin metallic disk is considered, in the frequency domain. At low and intermediate frequencies, either separation of variables and mode matching with matrix truncation or a direct numerical approach such as the MoM is adopted, while at high frequencies a combination...
The Cassini Titan Radar Mapper is one of the twelve instruments on board the Cassini spacecraft. The main goal of the radar is to map the surface of the larger of the Saturnian satellite, Titan, not excluding observation of the other icy satellites. The Cassini RADARr is a multimode instrument capable of providing not only images, when used in the SAR mode, but also the topography of the surface when...
A MIMO radar system with M transmitters and N receivers is used for target identification of unknown non-cooperative radar targets. The radar system is assumed wideband with sufficient bandwidth to obtain a target impulse response that shows significant scattering mechanisms and correlates well with the geometry of the target. Contributions in this paper are threefold: First, target identification...
We present a novel approach for the analysis of scattering of electromagnetic waves on rough surfaces for the case of large roughness. This approach relies on an asymptotic expansion in the inverse of the heigth function, to be considered as a random function. This expansion is dual to the small roughness expansion giving the possibility to study a different scattering regime. We exploit this approach...
HF radar signals rely on the ionosphere to achieve over-the-horizon surveillance, but this is obtained at the expense of subjecting the signals to a diverse range of scattering and modulation phenomena. Many of these effects are associated with multiple scattering, both in the ionosphere and near the earthpsilas surface. This paper reviews a variety of multiple scattering phenomena and shows how an...
This paper deals with the problem of analyzing the RADAR scattering from small constructive details on low RCS platforms. Starting from the ILDC formulations of gaps and cracks, as proposed by Shore-Yaghjian and other authors, we have generalized its applicability exploiting numerical results arising from 2D simulations. The procedure is simple and straightforward and allows the analysis of shapes...
This paper considers the problem of high-resolution imaging of the environment formalized in terms of a nonlinear ill-posed inverse problem of nonparametric estimation of the power spatial spectrum pattern (SSP) of the wavefield scattered from an extended remotely sensed scene (referred to as the scene image) via processing the discrete measurements of a finite number of independent realizations of...
A demonstration of multiple-input multiple-output over-the-horizon radar is presented. Transmitter signal beam- forming on a multi-element array has been created, not conventionally before transmission at the transmitter facility, but, after radar signal transmission, skywave propagation, target scattering, return signal propagation, and reception using an over-the-horizon radar receiver. Transmitter...
Radar signatures of complex targets for different frequencies, aspect angles and target positions are needed in various radar application areas. In addition, specific scattering centers of complex real radar targets have a strong impact on the overall signature of the target. However, measurements are mostly inefficient for providing the required information and for studying the behaviour of such...
Doppler analysis of radar sea-clutter is typically performed from a static cliff top location looking out to sea. This constrains the grazing angle to low values and the radar look direction with respect to the wind. Current research at the DSTO is interested in the properties of sea-clutter at medium to high grazing angles, over all azimuth directions, full polarisation and different spatial resolutions...
Recent work on electronic countermeasure (ECM) technique generation employed genetic algorithm optimization methods to define simple range-gate pull-off waveforms against a generic range-tracking radar simulation. This automated approach has potential to greatly reduce technique development time which is traditionally prolonged by manual experimentation. However, it also inspires a more generalized...
A number of groups are currently active in radar interferometry in Canada, including government institutions, universities and industry. This paper will present a survey of interferometry applications in Canada, and illustrate recent results. In the airborne radar domain, early research with the Canada Centre for Remote Sensing (CCRS) Convair-580, has led to successful commercial programs at MacDonald...
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