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Advances in Radio Science
Scopus
ISSN 1684-9965 · Copernicus Publications · 910 artikel di indeks
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Comprehensive signal processing approaches for non-contact heartbeat detection using 24 GHz FMCW radar
Non-contact monitoring of vital signs has become increasingly important for enhancing patient comfort and reducing interference during medical assessments. Such methods are particularly valuable for addressing phenomena such as white-coat hypertension and for enabling more accurate diagnoses in…
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Possible solar cycle influence on midlatitude mesosphere/lower thermosphere horizontal winds over Germany
At Collm (51.3° N, 13.0° E) mesosphere/lower thermosphere (MLT) zonal and meridional winds have been measured for more than four decades using low-frequency spaced receiver measurements on 177, 225, and 270 kHz, and very high frequency meteor radar observations on 36.2 MHz. We analyse the combined…
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Dyadic multipole-based generalized source integral equations
The approach of multipole-based generalized source integral equation (GSIE) formulations for the scattering by essentially-convex impenetrable objects is extended to dyadic problems. This is demonstrated through the two-dimensional (2-D) problem of transverse-electric (TE) scattering. For this…
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Concepts for a cost-efficient, additively manufactured WR90 coaxial waveguide transition
This publication focuses on the production of low-cost prototypes of coaxial-waveguide transitions (CWTs) that achieve the performance level of industrial WR90 and WR187 CWTs. The assembly consists of a specially designed coupling element in stripline technology that merges into an SMA connector…
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A review of orthogonal waveforms for spaceborne Multiple-Input Multiple-Output Synthetic Aperture Radar
Spaceborne Multiple-Input Multiple-Output Synthetic Aperture Radar (MIMO-SAR) overcomes fundamental shortcomings of state-of-the-art SAR, such as the trade-off between swath width and spatial resolution, and offers a greater agility of the antenna beam steering. In addition, MIMO-SAR enables a wide…
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A quarter of a century of polar mesospheric summer echo observations over Andøya: climatology and trends
Polar mesosphere summer echoes (PMSE) are strong radar signals received at very high radar frequencies at altitudes between about 80 and 95 km at polar latitudes during summer. PMSE are caused by inhomogeneities in electron density on the radar Bragg scale of 3 m (for a monostatic 53.5 MHz radar)…
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Ignition Tests using Electromagnetic Waves in Explosive Atmospheres
This work investigates the process by which electromagnetic waves heat solid surfaces, potentially leading to the ignition of explosive atmospheres. Initially, the temperature increase of various lossy materials exposed to electromagnetic waves at 92 GHz is experimentally determined. Based on these…
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Application of two movable antennas in a compact radar test range for angular measurements
This work presents the application of two movable antennas in a compact radar test range for testing the angular resolution of radar systems in an automotive environment. The goal is to simulate two targets in the azimuth direction, which are measured by a radar placed in the quiet zone. At first…
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Backscattering-Based Radiation Mode Analysis for Angle Estimation of a CRLH Leaky Wave Antenna
This study explores the extraction of the radiation mode field from backscattering field components of a composite right/left-handed (CRLH) leaky wave antenna (LWA) to estimate the relative angle to the radiation mode field within its frequency band of operation. Two methods, transmission line…
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A hybrid algorithm to process millimeter wave images with prism-shaped aperture
To process images of a prism-shaped aperture in a radar imaging context, a hybrid algorithm is derived. This hybrid algorithm combines the benefits of backprojection and the Omega-K algorithm in terms of computational performance and flexibility. As a demonstration for an application of this…
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Frequency-Selective Dual Linearly Polarized 76 to 81 GHz Automotive Radar System Concept for Street Condition Monitoring
This study introduces a novel frequency-selective radar system for street condition monitoring (SCM) that eliminates the cost-intensive dedicated monolithic microwave integrated circuit (MMIC) channels approach by sharing radar channels across different frequency bands. The proposed design uses a…
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Dual-Frequency SIW Slot Array Antenna for Automotive Radar: configurable FoV, Performance Evaluation, and Tolerance Analysis
This paper presents a single-layer SIW longitudinal slot array antenna optimized for high gain and low side lobe levels (SLL) in the W-band, designed for LMRR (Long Medium Range Radar) applications. This design enhances detection range at high frequencies. It also provides a wider azimuth field of…
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Spherical-Multipole Analysis of the Scalar Diffraction by a Circular Aperture in a Plane Screen
The paper deals with a new spherical-multipole solution for the scattering of an arbitrary incident wave by a circular aperture in an acoustically soft or hard plane. The boundary-value problem is formulated as a three-domain problem. In each of the domains the field is expanded by means of a…
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Long-term changes and trends of mesosphere/lower thermosphere gravity waves over Collm, Germany
Time series of mesosphere/lower thermosphere half-hourly winds over Collm (51.3° N, 13.0° E) have been obtained from 1984–2007 by low frequency (LF) spaced receiver measurements and from 2004 to date by very high frequency (VHF) meteor radar Doppler wind observations in the height range 82–97 km…
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Metrological Approach for Identifying Abnormalities and the Causes of Harmonics in Electrical Power Grids using Wavelets
In this work, current and voltage time series are analyzed using the continuous wavelet transform (CWT). It is shown that, in contrast to a Fourier transform, a CWT enables the detection and analysis of transient and short-term disturbances in power grids. This is particularly important during the…
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Modeling Ground-Wave Propagation Across Sea Ice for Radio Navigation Applications
The ground-wave signals of terrestrial radio navigation systems, which operate in the medium and low frequency band, are sensitive to changes in the electrical parameters of the Earth's surface between the transmitter and receiver. Sea ice affects the electrical parameters of the sea and leads to…
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Frequency-Dependent Variations of the Antenna Reflection Coefficient Due to Different Wetness Conditions on the Antenna Radome
It is investigated how the antenna reflection coefficient (ARC) of directional radio link antennas changes over time when the antenna radome gets wet and dries off afterwards. A hand sprayer is used to deposit droplets on antenna radomes manually. Next, ARC measurements are performed repeatedly…
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Uncertainties of S-Parameter Measurements in Rectangular Waveguides at PTB
In this work the determination of measurement uncertainties in scattering parameter measurements for waveguide interfaces ranging from R 100 (WR 90) to R 2.6k (WR 3, WM-864) is presented. For each waveguide band a Thru Reflect Line calibration is performed including uncertainties for calibration…
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Iterative Placement of Decoupling Capacitors using Optimization Algorithms and Machine Learning
In this work, an approach for optimum placement of on-board decoupling capacitors (decaps) is presented, which aims at reducing transient noise in power delivery networks (PDNs). This approach is based on a genetic algorithm (GA) and accelerated by the use of an artificial neural network (ANN) as…
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Using Autoencoders to Classify EMC Problems in Electronic System Development
This paper is a direct continuation of “AI Assisted Interference Classification to Improve EMC Troubleshooting in Electronic System Development” (Maalouly et al., 2022). The previous paper aimed to classify the electromagnetic compatibility (EMC) problem classification, while this paper addresses…