A transmitarray antenna with an elliptical cylindrical shape is presented for a wide-angle multibeam radiation in this communication. The has radiating aperture cross-section, namely, shape. Multiple feeds can be placed on the middle horizontal plane to realize multiple beams. Inspired by 2-D Ruze lens, and phase compensation are jointly designed according desired maximal beam direction. Innova...

A detailed analysis of multiple diffraction data collected by the stereoscopic multibeam imaging technique from a tetragonal lysozyme crystal is reported. Calculations based on the dynamical theory are employed to account for diffraction profiles obtained with Bragg-angle scan in stereoscopic imaging and the conventional azimuthal scan in Renninger arrangement. The formation of a multibeam inte...

We planed to conduct a “mowing the lawn” type of multibeam bathymetry and backscatter survey of the Florida Middle Ground HAPC (Habitat Area of Particular Concern; Figure 1) and to collect some ground truth data. The survey was to augment the existing coverage in the area from a previous USF cruise and will entail for the most part very long lines compared to the number of turns (Figure 1). The...

This article presents a millimetre-wave (MMW) wideband multibeam antenna array with pillbox transition using multilayer low-temperature cofired ceramic (LTCC) technology. The mushroom structure dual resonant modes offers performance for radiating array, while an integrated reflector achieves scheme. To reduce the design complexity of electrically large system, two popular transitions are invest...

This letter proposes a robust beamforming (BF) scheme to enhance physical layer security (PLS) of the downlink multibeam satellite system in presence either uncoordinated or coordinated eavesdroppers (Eves). Specifically, with knowing only approximate locations Eves, we aim at maximizing worst-case achievable secrecy rate (ASR) legitimate user (LU), subject constraints per-antenna transmit powe...

Development of protocols for calibrating multibeam sonar by means of the standard-target method is documented. Particular systems used in the development work included three that provide the water-column signals, namely the SIMRAD SM2000/90- and 200-kHz sonars and RESON SeaBat 8101 sonar, with operating frequency of 240 kHz. Two facilities were instrumented specifically for the work: a sea well...

Current high-resolution side scan and multibeam sonars produce very large data sets. However, conventional interferometry-based bathymetry algorithms underestimate the potential information of such soundings, generally because they use small baselines to avoid phase ambiguity. Moreover, these algorithms limit the triangulation capabilities of multibeam echosounders to the detection of one sampl...