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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
Comments on “Analysis of Bent Wire Antenna Resonant Frequency for Different Bent Angles”
- 17 September 2021
Key Points
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The recent article by Suganya et al. is incomplete and, in some places, unclear, which has resulted in misleading and incorrect conclusions on their dipole antenna. These comments serve to address the shortcomings of their paper
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The matching network used by Suganya et al. is inefficient, which results in poor radiation efficiency. While achieving a wide impedance bandwidth, the gain bandwidth of their design remains narrow
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Additional important considerations are presented, including the potential influence of nearby structures and ground on the antenna characteristics, as well as unique characteristics associated with operation in the HF (2–30 MHz) spectrum
Performance Characterization of ESA's Tropospheric Delay Calibration System for Advanced Radio Science Experiments
- 16 September 2021
Key Points
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A prototype water vapor radiometer for tropospheric delay calibration was installed at the deep space ground station in Malargüe
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The instrument performance has been statistically characterized through the orbit determination of the Gaia spacecraft
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Our results show improved frequency stability with respect to current calibrations based on global navigation satellite system data
Operational Multi‐GNSS Global Ionosphere Maps at GFZ Derived From Uncombined Code and Phase Observations
- 16 September 2021
Key Points
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Operational GFZ global vertical total electron content (VTEC) maps from ground global navigation satellite system (GNSS) data are introduced
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A rigorous least squares approach with uncombined multi-GNSS, multi-frequency code and phase data is applied
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A validation by means of a comparison with the solution of the International GNSS Service and Jason-3 altimetry VTEC data is provided
Comparison of Atmospheric Refractivity Estimation Methods and Their Influence on Radar Propagation Predictions
- 6 September 2021
Key Points
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Refractivity generated from models and measured data are compared to explore influences on radar wave propagation
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Proximity of duct height to transmitter and its variance have large effects on propagation; typically occurring during stable conditions
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M-deficit and profile curvature affect propagation when duct heights span the transmitter; largest variations occur in unstable conditions
Verification of an Intelligent Ray Launching Algorithm in Indoor Environments in the Ka‐Band
- 4 September 2021
Key Points
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Intelligent ray launching algorithm (IRLA) based channel simulations in three-dimensional (3-D) indoor environment models
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Radio channel measurements in indoor environments in the Ka-band of the millimeter-wave (mmWave) spectrum
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Comparison of power delay profiles (PDPs), path loss, and root-mean-square (RMS) delay spreads between simulation and measurement results
Multi‐Receiver Augmentation to Advanced Indian MST Radar (AIR)—Implementation of Spaced Antenna Technique
- 4 September 2021
Key Points
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Indian MST radar has been upgraded into a fully active system with multi-receiver capability, facilitating new processing techniques
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Spaced antenna technique has been implemented not only using traditional vertical beam but also using off-vertical beam measurements
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The efficacy of the antenna parameter has been tested for its usage in quality controlling winds
Analysis of Channel Characteristics Between Satellite and Space Station in Terahertz Band Based on Ray Tracing
- 4 September 2021
Key Points
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A time-varying multi-ray channel model is used to describe the multipath propagation and channel impulse response of the terahertz (THz) channel
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The link scenario between the satellite and the space station is modeled and analyzed
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According to the simulation results, the key parameters of the space THz channel are analyzed, and the space-time-frequency characteristics of the channel are characterized
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
A Modeling Framework for Estimating Ionospheric HF Absorption Produced by Solar Flares
- 23 September 2021
Key Points
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A new HF absorption model reproduces observations more accurately than the existing DRAP model with an average skill score of 40%
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Incorporating a broad range of solar irradiance wavebands and plasma-neutral interactions can significantly improve HF absorption prediction
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Model results suggest changes in the D-region electron temperature can impact the HF absorption experienced by traveling radio waves
MULTI‐POSITION FACILITY FOR HF DOPPLER SOUNDING OF IONOSPHERIC INHOMOGENEITIES IN UKRAINE
- 22 September 2021
Key Points
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We describe a novel multi-position HF Doppler facility in Ukraine and data processing technique capable of exploring the TID parameters
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Variations of the Doppler frequency shift from each of three sites revealed the salient TID characteristics in several case studies
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Statistical distributions of the appearance frequency, periods, horizontal speeds, and directions of TIDs during a few months are presented
Beyond 4100 Gbps Optical Backhaul Network with DSP Assistance based Nonlinear Impairments Mitigation
- 17 September 2021
Key Points
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Mitigation of nonlinearities in long haul high capacity opticacl networks
Comparative Research on Noise Reduction of Transient Electromagnetic Signals Based on Empirical Mode Decomposition and Variational Mode Decomposition
- 17 September 2021
Key Points
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Denoising of transient electromagnetic signals
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Variational mode decomposition
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Improving of signal quality
Investigating the the Ionospheric Perturbation Following the Beirut Explosion Event
- 17 September 2021
Key Points
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Detection and characterization of ionospheric perturbations generated by the 2020 Beirut explosion
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Signatures of acoustic gravity wave activities generated by the Beirut explosion is observed
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Lower and upper atmospheric coupling due to anthropogenic explosion is investigated
The Distribution Characteristics of GPS Cycle Slip Over the China Mainland and Adjacent Region During the Declining Solar Activity (2015–2018) Period of Solar Cycle 24
- 23 April 2021
Key Points
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The temporal and spatial characteristics of cycle slips are analyzed using the GPS data detected from almost 260 observations in the China sector during the period of the year 2015–2018
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The variations of cycle slip are dependent on the local time, seasons, solar activity, and latitudes
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The feature of cycle slip occurrence is related to the solar activity and distribution of ionospheric scintillation above a certain intensity level over the China region
Global Positioning System Observations of Ionospheric Total Electron Content Variations During the 15th January 2010 and 21st June 2020 Solar Eclipse
- 23 April 2021
Key Points
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Solar eclipse is a phenomenon that has a direct influence on the Earth's ionosphere
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The measure of the decrease in vertical value of total electron content during the eclipse hours are correlated with the partial and complete obscuration of solar radiation
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The scale of the reduction is closely associated with the eclipse magnitude
High‐Precision Carrier Tracking Algorithm for Extremely Weak and High‐Dynamic Signals
- 23 April 2021
Key Points
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A novel low pass denoising method is proposed
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A improved PLL with excellent performance is achieved
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The proposed method is suitable for high-precision carrier tracking in deep space exploration, especially for high-dynamic and weak signals
Superconducting Receiver Technologies Supporting ALMA and Future Prospects
- 18 April 2021
Key Points
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We developed highly sensitive terahertz receivers for the Atacama Large Millimeter/submillimeter Array
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Seventy-three receivers with NbTiN-based superconducting mixers were successfully produced at the National Astronomical Observatory of Japan
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Next-generation receivers to enhance the capabilities of the current telescope are being developed
A Detection Performance Analysis of Sanya Incoherent Scatter Radar Tristatic System
- 16 April 2021
Key Points
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Multistatic phased array Incoherent scatter radars (ISR) equation for soft target is derived
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The detection performances of phased array monostatic and bistatic ISR are analyzed for pulse width, height, beam width and scattering volume
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Optimal tilt and rotation angles of receiving array are suggested for Sanya incoherent scatter radar (SYISR) tristatic system
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
Estimation of the transmitter and receiver differential biases and the ionospheric total electron content from Global Positioning System observations
- Radio Science
- 577-586
- May-June 1994
Relative detection efficiency of the World Wide Lightning Location Network
- Radio Science
- 13 December 2012
Key Points
- A relative detection efficiency model for the WWLLN is developed
- The model is used to analyze current and past network performance
- The performance effects of a single station outage are examined
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
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
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.
