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Radio Science
Radio Science publishes original research articles on radio frequency electromagnetic-propagation and its applications.
RESEARCH ARTICLE
Superconducting Receiver Technologies Supporting ALMA
Credit: Uzawa et al. 2021, Figure 1
RESEARCH ARTICLE
Dual‐Polarized FSR with Wide Transmission Band
Credit: Jiao et al. 2021, Figure 17
RESEARCH ARTICLE
Holographic Calibration of Phased Array Telescopes
Credit: Kiefner et al. 2021, Figure 10
CALL FOR PAPERS
THz Propagation Characterization, Modeling & Wireless Link design
Credit: Adobe Stock (CC-BY-NC)
CALL FOR PAPERS
Effect of air-sea coupling electromagnetic propagation
Credit: Denny Alappattu and the CASPER team
Browse Articles
Automatic Spread‐F Detection Using Deep Learning
- 26 April 2022
Key Points
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Adopt machine learning techniques to detect spread-F in ionograms
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Make an annotated data set of around 28,000 ionograms publicly available
An Observed Trend Between Mid‐Latitudes Km‐Scale Irregularities and Medium‐Scale Traveling Ionospheric Disturbances
- 23 April 2022
Key Points
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Region-specific and vertically integrated measurements of km-scale irregularities and traveling ionospheric disturbances (TIDs) were made
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1.5 years of data revealed that both measurement types sensed the same population of irregularities/disturbances in complementary ways
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Significant trends were found between km-scale irregularity levels and TID amplitudes using both types of measurements
Generalized Modeling and Propagation Characterization of THz Wireless Links in Computer Desktop Environment
- 15 April 2022
Key Points
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The THz measurements have been conducted in the novel motherboard desktop environment
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The THz channel model includes the mean path loss model, the Gamma-mixture model, and the modified S-V model
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The results measured in free-space and the motherboard desktop environment have been compared and analyzed
Radiation Pattern Nulling in Phased Array Antennas Using Superior Discrete Fourier Transform and Dolph‐Tschebyscheff Based Synthesis Techniques
- 14 April 2022
Key Points
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Two localized beam cancellation methods for antenna pattern nulling are proposed
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The theoretical formulations of a Discrete Fourier Transform and a Dolph-Tschebyscheff based algorithm are explained
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Numerical examples demonstrating the effectiveness of the algorithms are presented
Remote Sensing of Mid‐Latitude Ionospheric Magnetic Field Fluctuations Using Cosmic Radio Sources
- 13 April 2022
Key Points
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Using interferometry, magnetic field fluctuations can be measured with bright, unpolarized cosmic radio sources
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Examples presented here show fluctuations with amplitudes ∼10–30 nT and oscillation periods ∼10–40 min on a scale of 75 km
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These perturbations could plausibly be tied to changes in the background electric field driven by gravity waves with amplitudes ∼10 m s−1
W‐Band 76–81 GHz Millimeter‐Wave Comb‐Line Array for Automotive Short Range Radar
- 13 April 2022
Key Points
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A mm-wave antenna for the W-band of 76–81 GHz targeted at automotive applications is presented
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A four-port array of comb-line antennas with tilted stubs is designed
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A prototype of the design by simulations, which include a grounded coplanar waveguide feed network, was manufactured and measured, yielding good results
How Two Crossed Dipoles' Impedance Varies With Their Non‐Orthogonality, Length & Separation
- 8 April 2022
Key Points
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Qualitative insights on how the mutual impedance of cross-dipoles varies with their skew angle, common length, and separation
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The proposed phenomenological modeling approach least-squares-fits the cross-dipoles' mutual impedance values to low-dimensional models
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Despite these phenomenological models' few degrees of freedom, the proposed models successfully facilitate direction finding
Ionospheric Reconstruction Using GNSS Signals Around an Anomaly Crest Location in Indian Longitude Sector
- 8 April 2022
Key Points
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Among the different tomography techniques simultaneous iterative reconstruction technique was the optimum choice based on the representation of the equatorial ionization anomaly
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PIM based initial guess for the reconstruction resulted in lower reconstruction errors and better reconstruction profile as compared to IRI
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Hourly vertical electron density profiles were reconstructed to study the impact of a G1-class and a G4-class geomagnetic storm
Measurement of SST and SSS Using Frequencies in the Range 0.3–2.0 GHz
- 7 April 2022
Key Points
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Measurement of sea surface temperature (SST) is possible as part of low-frequency wideband remote sensing of the cryosphere
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Measurement of SST to support wideband remote sensing of sea surface salinity is possible
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Measurement of SSS and SST possible together with low-frequency wideband sensor
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
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
AIM: Adaptive integral method for solving large‐scale electromagnetic scattering and radiation problems
- Radio Science
- 1225-1251
- 1 September 1996
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
Measurement of Ionospheric Total Electron Content Using Single‐Frequency Geostationary Satellite Observations
- Radio Science
- 10-19
- 24 October 2018
Key Points
- The derivation of total electron content using single-frequency terrestrial GPS receivers and geostationary satellites is demonstrated
- The demonstrated technique is validated by correlation analysis
- The correlations between TEC time series for pairs of receivers and between receivers and an ionosonde over a year show good agreement
Plain Language Summary
The ionized upper portion of the atmosphere is known as the ionosphere. The ionosphere interferes with signals traveling between satellites and the ground and can cause errors in satellite navigation, surveillance, and communication systems. The impact of these errors can be reduced if we are able to measure the total electron content (TEC), which can be simply thought of as the total number of electrons in a straight line between a satellite and the ground. We have developed a technique that allows us to measure TEC using receivers measuring single-frequency signals from geostationary satellites. This is useful because it will increase the number of measurements available and because using geostationary satellites makes the measurements relatively easy to interpret. To test the technique we use a correlation analysis to compare measurements made by the single-frequency receivers. We also correlate technique measurements with independent TEC observations made by an ionosonde. All correlation results showed good agreement, suggesting consistency for the technique, and that the technique is reliable. The demonstrated technique has the potential to become a routine method to derive TEC, which will help to map the ionosphere in real time.
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
Long‐term observations of Schumann resonances at Modra Observatory
- Radio Science
- 27 January 2007
Radio wave propagation through vegetation: Factors influencing signal attenuation
- Radio Science
- 7 October 2003
Software‐Defined Radio Decoding of DCF77: Time and Frequency Dissemination with a Sound Card
- Radio Science
- 48-61
- 14 December 2017
Key Points
- DCF77 signals are used for time of flight measurement using Software-defined radio processing
- A 10 μs resolution time measurement and sub-ppm frequency resolution with a sound card are demonstrated
- Ionospheric delay characterization for educational purposes and long-term instigation with low-cost equipment has been developed
Plain Language Summary
Software-defined radio aims at reducing to its minimum the hardware setup needed to process radio frequency signals and relies on software processing for demodulation: here we demonstrate the precise measurement of an atomic clock-locked emitter, propagating at very low frequency, using only a general purpose computer sound card. Thanks to the high accuracy of the time of flight accessible through an improved modulation schemes, such physical properties as ionosphere altitude and ground wave versus air wave are detected. The frequency of the atomic clock is compared with the sound card local oscillator frequency, demonstrating the temperature dependence of the latter, readily measured in this experiment.
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
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.
Singular value decomposition methods for wave propagation analysis
- Radio Science
- 12 February 2003
