Abstract-The increased use of carbon-fiber composites in Unmanned Aerial Vehicles is a challenge for their EMC assessment by numerical solvers. For accurate and reliable simulations, numerical procedures should be tested not only for individual components, but also within the framework of complete systems. With this aim, this paper presents a benchmark test case based on experimental measurements coming from direct-current injection tests in the SIVA unmanned air vehicle, reproduced by a numerical Finite-Difference-Time-Domain solver that employs a new subgridding scheme to treat lossy composite thin panels. Validation was undertaken by applying the Feature Selective Validation method, which quantifies the agreement between experimental and numerical data.

We welcome contributions for future installments of the Measurements Comer. Please send them to Brian Fischer and Ivan LaHaie, and they will be considered for publication as quickly as possible. Contributions can range from short notes to full-length papers on all topics related to RF measurement technology and its applications, including antennas, propagation, materials, scattering, and radar cross section. New or unique measurement techniques are of particular interest.While there are many radar cross section measurement (RCS) facilities around the world, very few are capable of making bistatic RCS measurements. Many of those that can are typically limited in the range of bistatic angles they can collect. This issue's Measure ments Comer paper describes a new indoor RCS facility capable of collecting bistatic data over a full hemisphere above the target. Of particular interest is the facility's ability to support investigations into near-field-to-far-field RCS transformations. Abstract A new indoor facility for electromagnetic measurements has been developed and built at the Detectability and ElectronicWarfare Laboratory, INTA, Spain. The system was designed to ex tend the previous capabilities so that not only monostatic but also bistatic radar cross section (RCS) tests could be easily conducted. Due to limited space, far-field radar cross sections in the system are restricted to small targets, but this layout will allow the researchers to investigate RCS near-field-to-far-field transformations. The system was also conceived to be versatile enough to carry out other tests, such as near-field antenna measurements, material-absorption measurements, and electromagnetic characterization of materials. The paper describes the novel concept behind the facility, and presents some preliminary measurement results on different applications.

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A heuristic solver such as particle swarm optimization (PSO) is used for single snapshot direction of arrival (DOA) estimation of a set of signals impinging on a uniform linear array (ULA). A performance analysis for infinite signal-to-noise ratio (SNR) shows the validity of this approach and an example using signal and ULA parameters from a more realistic DOA problem is also included.

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Direction Of Arrival (DOA) estimation is a well known problem involved in different applications. The latest of these applications have greater constraints which make necessary new efforts in estimating the DOA with fewer snapshots. In that sense, this paper presents an iterative method based on Particle Swarm Optimization that solves the problem with a single snapshot. The performance of this algorithm is analyzed and shown with numerical results under different scenarios. Conclusions are also provided.