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In this paper, a simple electromagnetic model for wind turbine's backscattering is proposed. The wind turbine is modeled as a linear structure made of three rotating wires on which an electromagnetic fields impinges. Since a wind turbine is much bigger than typical radar range resolution cells, just a small part of it is involved in the backscattering for a single resolution cell. An analysis of the...
We present in this paper a design of a high gain antenna for radar-based non-contact measurement systems in the k-band frequency. The proposed antenna consists of a slot on a multi-grooved metal structure (flange) and a frequency selective surface (FSS) acting as a flat lens. Often, grooved (or corrugated) surfaces and frequency selective surfaces are used to enhance antenna gain features. The combination...
An antenna system simultaneously providing a radar function and a secondary communication function with beam agility is proposed. The system is composed of a slotted waveguide (for the communication function) feeding a horn antenna (for the radar function). Direct modulation in four different directions can be obtained for communication provided each radiating slot is equipped with a simple switch.
Target identification from scattered signals using time domain techniques depend significantly on the waveform. Recently, a novel feature set is proposed which encounter structural properties of the waveform and collects local extrema points to model the scattered signal via triangularization. Then, using this piecewise model, it extracts several morphological features and employs them for target...
Multiple-Input Multiple-Output (MIMO) radars can improve the angular resolution of automotive radar sensors. In MIMO radars, a critical design parameter is finding the optimal placement of the transmitting and receiving arrays. Indeed, the physical position of the transceivers affects directly the properties of the virtual array. Unfortunately, the inverse mapping from the virtual array to the real...
We demonstrate a compact design for enhancing the 3dB beamwidth of a 60 GHz single-chip millimeter-wave frequency modulated continuous wave (FMCW) radar with integrated on-chip antennas. We use thin (Xfreespace/5) dielectric periodic lenses on top of the epoxy cover of the single-chip radar to change the effective material properties of the epoxy, which changes the field distribution and hence the...
The setting of photovoltaic power stations near aeronautical communication, navigation and surveillance (CNS) devices may cause scattering and multipath effects. For VHF radiocommunications, this may lead to a critical degradation of onboard/ground communications. This paper aims at proposing a fast computation of the impact of such solar parks on communication signals, based on the solar-panels bistatic...
The sky wave and the surface wave radars can be impacted by the instabilities of the ionosphere while they perform continuous surveillance of very large and far-off areas. When long-term integration is performed, those instabilities are leading to an increased false alarm rate. This is the typical case when detecting slow targets such as vessels. In this paper, we will discuss the case of a hybrid...
The adoption of a Bessel beam source is proposed in this work as localized near-field antenna for through-the-wall radar applications. The basic idea is to exploit all appealing features of Bessel beams, in terms of ideally infinite propagation depth, narrow beam pattern and field invariance on the transverse plane, to enhance both the resolution as well as the robustness towards clutter effects of...
Radar techniques have been used recently to monitor bats when they are hunting close to wind energy plants. However, the real-time detection of bats is a challenge and activity metrics must be defined that enable a robust bat detection. In this paper we report on FMCW radar measurements at 24 GHz of Seba's short-tailed fruit bats (Carollia perspicillata) in a laboratory flight tunnel. Experiments...
In this paper we describe a method to discriminate multipath components in joint angular and temporal domain by exploiting the a-priori knowledge of the antennas characteristics into an ad-hoc algorithm for wideband backscattering channels. By means of two indoor measurement campaigns performed using millimeter-waves massive arrays in a corridor and in an office room, we show the feasibility of the...
This contribution is based on an novel imaging system able to create real time radar images for personnel security screening recently presented. The imaging is performed as the person being screened continuously moves across a corridor populated with transmitters and receivers, and taking advantage of the person's movement to increase the number of observation angles. As part of a preliminary study...
This paper shows the design of a radial line slot antenna for being used in indoor environments in the 60 GHz band of the future 5G communication systems. The antenna is designed to work in near field situation, creating a uniform field in a certain volume, improving the size of this volume with respect the use of uniform phase. The paper analyzes different configurations of phase on the slots and...
This paper shows a wireless chipless displacement sensor for IoT applications. It is designed for environments where only an on-off position detection is required. The results shows that an oscillation of 30 mm can be detected at a 30 cm distance giving a 10% resolution. Static and dynamic tests demonstrate that the number of oscillations around a certain position can be counted.
This paper studies the accuracy and limitations of different electromagnetic (EM) simulation approaches for dielectric radar benchmark targets. In comparison to perfect electric conductors (PEC), dielectric targets are much more complex from an EM point of view. However, dielectric materials are widely used for modern aircraft and unmanned aerial vehicles (UAVs). Apart from that, EM simulation tools...
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