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Radio Science
Radio Science publishes original research articles on radio frequency electromagnetic-propagation and its applications.
Browse Articles
Wavelet Analysis of Differential TEC Measurements Obtained Using LOFAR
- 30 March 2024
Key Points
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Differential Total Electron Content measurements from LOFAR are a valuable source of information on the mid-latitude ionosphere
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Ionospheric waves with wavelengths between 100 and 500 km can be identified using these measurements
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Noise spectra are estimated to provide confidence limits for estimated wave parameters
Cross‐Polarization Gain Calibration of Linearly Polarized VLBI Antennas by Observations of 4C 39.25
- 28 March 2024
Key Points
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The new-generation geodetic radio telescopes observe two orthogonal linear polarization directions
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Calibration of the gain differences between the two polarizers is necessary to maximize the signal-to-noise ratio of observations
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We investigate these cross-polarization gain differences and their temporal evolution for selected antennas
Spectroscopic Evaluation of Epidermis‐Equivalent Phantom in Terahertz‐Frequency Region
- 26 March 2024
Key Points
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The complex refractive index and reflectance of an epidermis-equivalent phantom were evaluated in the terahertz frequency region
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Complex refractive indices of the epidermis of porcine skin and the epidermis-equivalent phantom were compared using a THz spectrometer
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A rough surface of the epidermis-equivalent phantom was required to match the reflectance of the phantom with that of the epidermis
A Cryogenic Wideband (2.5–14 GHz) Receiver System for the Arecibo Observatory 12 m Telescope
- 23 March 2024
Key Points
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Successful commissioning of a wideband, cryogenic receiver for the 12 m telescope at the Arecibo Observatory
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Achieved system temperature of 40 K and gains of 0.025 K/Jy and 0.018 K/Jy at frequencies 3.1 and 8.6 GHz respectively
Variation in the Reflection Height of VLF/LF Transmitter Signals in the D‐Region Ionosphere and the Possible Source: A 2018 Meteoroid in Hokkaido, Japan
- 26 February 2024
Key Points
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Periodic variation of 100–200 s was observed at very low-frequency/low-frequency amplitudes and in seismic data at the time of acoustic wave arrival
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The acoustic wave originated near the endpoint (25 km altitude) of the meteoroid trajectory
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The disturbed ionospheric area was estimated to be south of the Rikubetsu receiver, at 90 km height
Measurement and Calibration of EMF: A Study Using Phone and GBDT for Mobile Communication Signals
- 19 February 2024
Key Points
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Using smartphones and machine learning to measure the electric field strength of mobile communication signals
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A system converting the power of mobile communication signals to electric field strength with high accuracy
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Suitable for large-scale and low-cost measurement of the electric field strength of mobile communication signals
Processing of VLF Amplitude Measurements: Deduction of a Quiet Time Seasonal Variation
- 10 February 2024
Key Points
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VLF signal processing with robust statistical methods, Median of Absolute Deviations and Pruned Exact Linear Time
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Deduction of quiet time amplitude behavior through change point detection and systematic outlier filtering
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VLF signal amplitude seasonal variation identified for five different transmitter-receiver paths during undisturbed conditions
Electron Density Specification in the Inner Magnetosphere From the Narrow Band Receiver Onboard DSX
- 6 February 2024
Key Points
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U-Net can automatically extract plasma frequencies from in situ wave receivers after it is trained from spectrograms with accurate labels
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Electron densities and cyclotron frequencies for the entire DSX mission are published for other research and applications
Dual‐Band Reflectarray Antennas Using Integrated Resonant and Non‐Resonant Natures of Metallic Waveguide Elements at Millimeter Wave Frequencies
- 16 January 2023
Key Points
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This paper proposed to develop configurable composite reflecting elements for dual-band reflectarray antennas using die-casting technology
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The configurability allows the reflectarray to operate at two frequency bands with a separated focusing mechanism
GMSK Demodulation Combining 1D‐CNN and Bi‐LSTM Network Over Strong Solar Wind Turbulence Channel
- 13 January 2023
Key Points
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The K distribution channel model for the strong solar wind turbulence is innovatively established by analyzing the model of telemetry signal amplitude fluctuation caused by solar wind turbulence
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To demodulate the Gaussian minimum frequency shift keying (GMSK) signals over strong solar wind turbulence channel, two neural network demodulators based on bidirectional long short-term memory network (LSTM) and one-dimensional convolutional neural network (1D-CNN) are designed, which can obtain better bit error rate performance than the conventional coherent demodulation
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By combining the feature extraction capability of the 1D-CNN and the processing capability of LSTM for time series, we propose a novel GMSK demodulator
Model to Scale Rain Attenuation Time Series With Link Elevation Angle for LEO Satellite Based Systems
- 13 January 2023
Key Points
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A model to scale rain attenuation time series with link elevation angle offering better accuracy over the customary cosecant law scaling
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The model generates a set of rain attenuation time series maintaining the time and space correlation as a function of link elevation
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The model's accuracy is evaluated in two sites with different climatic features
Computation of Optical Refractive Index Structure Parameter From Its Statistical Definition Using Radiosonde Data
- 9 January 2023
Key Points
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Profiles of the optical refractive index structure parameter can be obtained using high-density radiosonde data
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These profiles are site-dependent and enable to identify local optical turbulent layers associated with temperature inversions
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The presented model has been validated with thermosonde measurements
Generalization Ability of Deep Learning Algorithms Trained Using SEM Data for Objects Classification
- 17 November 2022
Key Points
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Classification of spherical objects is achieved by using preprocessed data from the singularity expansion method (SEM)
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The residues allow to determine the position of the antenna relative to an object
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SEM data provide good noise robustness, high classification accuracy, and excellent generalization to any object size
Satellite radar interferometry: Two‐dimensional phase unwrapping
- Radio Science
- 713-720
- July-August 1988
A global mapping technique for GPS‐derived ionospheric total electron content measurements
- Radio Science
- 565-582
- 1 May 1998
Vegetation modeled as a water cloud
- Radio Science
- 357-364
- March-April 1978
Geodesy by radio interferometry: Effects of atmospheric modeling errors on estimates of baseline length
- Radio Science
- 1593-1607
- November-December 1985
Singular value decomposition methods for wave propagation analysis
- Radio Science
- 12 February 2003
Estimation of tropospheric delay for microwaves from surface weather data
- Radio Science
- 379-386
- May-June 1987
Statistics of total electron content depletions observed over the South American continent for the year 2008
- Radio Science
- 29 October 2011
Key Points
- First time regional plots of TEC depletions
- New numerical algorithm developed to automatically detect TEC depletions
- Day-to-day variability of TEC depletions in a regional basis
A power law phase screen model for ionospheric scintillation: 1. Weak scatter
- Radio Science
- 1135-1145
- November-December 1979
Large ionospheric disturbances produced by the HAARP HF facility
- Radio Science
- 1081-1093
- 4 June 2016
Key Points
- HAARP facility produces unique results
- Artificial plasma clouds are emission and optical signatures
- Future HAARP experiments are needed to explain physics
Accurate measurements of the dielectric constant of seawater at L band
- Radio Science
- 2-24
- 2 December 2015
Key Points
- Dielectric measurements of seawater are made with a microwave cavity at 1.413 GHz
- Measurements are made as a function of temperature and salinity for values found in open ocean
- Accuracy is better than 0.3 for both real and imaginary parts of the dielectric constant
Fresnel Reflection and Transmission Coefficients for Temporally Dispersive Attenuative Media
- Radio Science
- 1382-1397
- 27 October 2018
Key Points
- General expressions for Fresnel reflection and transmission coefficients for homogeneous and inhomogeneous plane waves are derived for TE- and TM polarized plane waves in complex media with loss
- The critical angle for total internal reflection remains unchanged when material loss is included; the polarizing angle (for a TM polarized plane wave is changed otherwise, a pseudo Brewster's angle occurs at which the magnitude of the TM) polarization reflection coefficient is a minimum
- Total reflection at grazing incidence on the optically denser medium does not occur when both media exhibit loss; total reflection does not occur at critical incidence when both media exhibit loss.
Plain Language Summary
Amplitude reflection and transmission coefficients for a time-harmonic electromagnetic plane wave incident upon a plane interface separating two different lossy media are developed.
A Review on Different Techniques of Mutual Coupling Reduction Between Elements of Any MIMO Antenna. Part 1: DGSs and Parasitic Structures
- Radio Science
- 4 February 2021
Key Points
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Multiple-Input-Multiple-Output (MIMO) patch antenna is required for high data rate transmission without additional bandwidth requirement
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Mutual coupling reduction among antenna elements is a significant challenge while designing a compact antenna array system
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Defected Ground Structures and Parasitics elements/structures for mutual coupling reduction have been discussed thoroughly in this article
Plain Language Summary
A comprehensive two-part review article with more than 330 references is proposed.
Calculating the absorption of HF radio waves in the ionosphere
- Radio Science
- 767-783
- 5 June 2017
Key Points
- Either the Appleton-Hartree or Sen Wyller dispersion relation can be used to calculate absorption
- It is necessary to utilize the correct collision frequency specification for each dispersion relation
- Geophysical variations of collision frequency should be included in absorption calculations
An Indoor Path Loss Prediction Model Using Wall Correction Factors for Wireless Local Area Network and 5G Indoor Networks
- Radio Science
- 544-564
- 2 April 2018
Key Points
- A modified effective wall loss model (EWLM) for indoor environment is presented
- Real-time measurements and simulations for various indoor path loss models are used
- Several frequency spectrum band were considered for evaluation purposes
Radio wave propagation through vegetation: Factors influencing signal attenuation
- Radio Science
- 7 October 2003
Breast Cancer Detection Based on Simplified Deep Learning Technique With Histopathological Image Using BreaKHis Database
- Radio Science
- 21 November 2023
Key Points
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The results of an investigation to determine effectiveness of deep learning (DL)-based systems for detecting breast cancer is presented
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The strategy here for DL training uses various image processing techniques for extracting different feature patterns
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It is shown that the convolutional neural network models provide different results for different degrees of image resolution
