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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
RESEARCH ARTICLE
Dual‐Polarized FSR with Wide Transmission Band
RESEARCH ARTICLE
Holographic Calibration of Phased Array Telescopes
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
Evaluation of the New Background Covariance Model for the Ionospheric Data Assimilation
- 28 July 2021
Key Points
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The influence of the recently developed vertical and horizontal correlation model on the performance of Ionospheric Data Assimilation Four-Dimensional is investigated
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The tomographic issue occurs at the grid cells where the rays with slant total electron content measurements intersect
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The vertical component of the background error covariance matrix plays the most important role in solving the above tomographic issue
Ultra‐Wideband SAR Tomography on Asteroids
- 27 July 2021
Key Points
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High-Frequency Radar (HFR) is an UWB Synthetic Aperture Radar (SAR) developed to retrieve the 3D structure of the first 10 m of an asteroid's subsurface
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SAR Tomography (TomoSAR) is crucial to improve the resolution in the vertical direction
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In the specific asteroid geometry, simulations are necessary the assess the performances of the TomoSAR algorithms
Ionospheric Echo Detection in Digital Ionograms Using Convolutional Neural Networks
- 26 July 2021
Key Points
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This is the first time a multilayer convolutional neural network has been used to identify ionogram traces
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The trace extraction performance of the neural network surpasses the performance of some machine learning models. A comparison is presented
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The NN presented does not need a large amount of unlabeled data, good performance is achieved using a small number of labeled data
Spectrum Monitoring of Radio Digital Video Broadcasting Based on an Improved Generative Adversarial Network
- 23 July 2021
Key Points
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An improved generative adversarial network (GAN) model is proposed based on the original GAN to detect abnormal behavior in the radio spectrum
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The proposed model has excellent performance in anomaly detection on both simulated data set and true data set
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The accuracy of the proposed model to detect abnormal behavior increases on the wider bandwidth and higher power
Drift Velocity Estimation of Ionospheric Bubbles Using GNSS Observations
- 20 July 2021
Key Points
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Global navigation satellite systems observations to infer plasma bubbles velocities
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Airglow images to confirm the plasma bubbles velocities
Stochastic Wave Distribution Function Method
- 19 July 2021
Key Points
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We propose a stochastically extended WDF method using Bayesian inference
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In our SWDF method, WDFs are generated using Markov chain Monte Carlo method
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The SWDF method calculates the mean value and 95% credible interval of the sampled WDFs using the MCMC method
Processing and Validation of FORMOSAT‐7/COSMIC‐2 GPS Total Electron Content Observations
- 19 July 2021
Key Points
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Describe details of the processing methodology used for the Formosa Satellite-7/Constellation Observing System for Meteorology, Ionosphere, and Climate-2 (F7/C2) GPS absolute total electron content observations
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Comparisons with colocated Swarm total electron content observations are used to validate the F7/C2 observations
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F7/C2 GPS absolute total electron content observations are estimated to have an error below 3.0 TECU
Using the World Wide Lightning Location Network (WWLLN) to Study Very Low Frequency Transmission in the Earth‐Ionosphere Waveguide: 1. Comparison With a Full‐Wave Model
- 5 July 2021
Key Points
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Infer signal attenuation even without precise knowledge of the source strength
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Model the night-to-day transition in very low frequency radio attenuation in Earth Ionosphere Waveguide
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Model based on full-wave calculation of Very Low Frequency reflection from underside of ionospheric D-layer
Noise Integration Kernel Design for the Wave Distribution Function Method: Robust Direction Finding with Different Sensor Noise Levels
- 3 September 2021
Key Points
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We designed two noise integration kernel models for the direction finding of plasma waves
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The noise integration kernel for each sensor performed well under limited conditions with different sensor noise levels by simulation
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The noise integration kernel using information about noise level ratios performed robustly with different sensor noise levels by simulation
Preliminary Evaluation of Hai‐Nan Lightning Detection Network (HNLDN)
- 27 August 2021
Key Points
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Use very low frequency/low frequency network location
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Depiction of a wide range of lightning in space
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The new method improves the detection efficiency of intracloud lightning and increases the number of lightning locations
An EISCAT UHF/ESR experiment that explains how ionospheric irregularities induce GPS phase fluctuations at auroral and polar latitudes
- 26 August 2021
Key Points
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Measurements indicate that the observed auroral and polar irregularities were distributed over large distances
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Polar plasma patches and auroral particle precipitation enhance temporal fluctuations in GPS Total Electron Content
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Enhanced fluctuations in Total Electron Content occur over similar temporal scales for plasma patches and particle precipitation
Juno Waves high frequency antenna properties
- 22 July 2021
Key Points
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High frequency properties of the Waves instrument aboard the Juno spacecraft
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Waves directivity takes arbitrary shapes over receive spectrum
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Waves foot point impedance introduces significant discontinuity loss
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
On the reliability of the Spatial Scintillation Index to detect earthquake precursors in the ionosphere
- Radio Science
- 745-753
- 16 July 2015
Key Points
- We discuss the SSI index as indicator of earthquakes precursors
- We show that SSI preearthquake changes may be explained as geomagnetic effects
- We show that SSI is not reliable indicator of precursory effects of earthquakes
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
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.
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
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
Digital transmission techniques for a long haul HF link: DSSS versus OFDM
- Radio Science
- 518-530
- 30 June 2014
Key Points
- Advanced modulation techniques applied to HF communications
- Spread spectrum and OFDM modulations for ionospheric transmissions
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
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.
