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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
Assessing the Kinematic GPS Positioning Performance Under the Effect of Strong Ionospheric Disturbance Over China and Adjacent Areas During the Magnetic Storm
- 22 January 2022
Key Points
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Ionospheric disturbances caused Global Positioning System (GPS) positioning degradation during a magnetic storm on 08 September 2017 over China and adjacent areas
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Ionospheric irregularities caused by magnetic storm is one of the important reasons that affect the accuracy of GPS positioning
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Ionospheric disturbances affect the occurrence of GPS cycle slips, thereby affecting GPS positioning performance and accuracy
DOA Estimation of Linear Dipole Array With Known Mutual Coupling Based on ESPRIT and MUSIC
- 7 January 2022
Key Points
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Direction of arrival estimation
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Known mutual coupling
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Multiple signal classification and estimation of signal parameters via rotational invariance technique
Joint Transmitting Subarray Partition and Beamforming for Active Jamming Suppression in Phased‐MIMO Radar
- 7 January 2022
Key Points
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The transmitting array of radar system is partitioned into a certain number of non-overlapped subarrays and the transmit waveforms of all subarrays have the same modulus. And constraining the modulus of each element of the transmit beamformer weight vector of each subarray to 1 can not only ensure that the weighted waveforms of all transmitting antennas still have the same amplitude, but also keep the transmit power of each antenna unchanged, thus efficiently maximizing the power utilization of radar transmitter
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The transmitting subarray structure and the corresponding transmit beamformer weight vectors are simultaneously optimized by constructing the optimization model of maximizing the signal-to-noise ratio of the whole received echoes under certain constraint conditions, so as to effectively reduce the peak sidelobe level of transmit beampattern and improve the radar anti-jamming and target detection performance
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The adaptive beamforming technique is applied to suppress the jamming signal entering the receiver, so that the transmitting and receiving adaptive degrees of freedom are jointly utilized to enhance the active anti-jamming capability of radar system
Analysis of HF Receiving Antenna SNR and Application
- 4 January 2022
Key Points
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The basis for receiving high frequency antenna design was revealed by synthetically analysis of the antenna and signals to noise ratio
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A novel high frequency receiving antenna was designed and fabricated
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A comparison measurement was carried out to verify our proposal and the application
Comparison of Frequency‐Domain Electromagnetic Responses at Different Offsets Based on Exact Calculation of Grounded‐Wire Source
- 27 December 2021
Key Points
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A point charge element is introduced to decrease or eliminate the error caused by dipole approximation
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The response expression of the real source, including the source position vector, is derived
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The electromagnetic characteristics of the entire zone are displayed
An Efficient and Compact Monopole Antenna Backed With Square Loop EBG Structure for Medical Wireless Body Area Network Applications
- 27 December 2021
Key Points
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In this paper, a compact, low-profile, and simple monopole antenna is presented that is operated at the frequency of 2.4 GHz in industrial scientific medical band
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The monopole antenna is based on the simple rectangular microstrip patch antenna with a rotated T-shaped slot. Furthermore, a 2 × 2 electromagnetic band-gap array is used in this design to act as an isolator between the antenna and human body, which additionally increases the performance of the proposed antenna
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The final design has an overall size of 0.9λg × 0.9λg × 0.034λg (60 × 60 × 2.3 mm3), where λg is the guided-wavelength with respect to RO4003 substrate at the resonant frequency of 2.4 GHz. This can make the structure a good candidate for wireless body area network applications
Diffuse Whistler‐Mode Waves Detected by Kaguya in the Lunar Polar Region
- 27 December 2021
Key Points
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Diffuse emission of whistler-mode waves from 1 to 16 Hz is found over the polar regions of the Moon in the solar wind
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Right-hand polarized waves propagate parallel to the background magnetic field without a significant Doppler shift
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The waves are thought to be generated by the ions reflected by the Moon and propagate along field lines convected by the solar wind
First Observations of the New MEXART's Digital System
- 26 December 2021
Key Points
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Radio telescope dedicated to the study of solar wind properties and space weather effects using the interplanetary scintillation technique
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The new digital backend has several beamforming configurations, increases the bandwidth, and improves the instrument's sensitivity
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With the new technical capabilities, the instrument can participate in space weather forecasting and other astrophysical studies
Refractivity Inversions from Point‐To‐Point X‐Band Radar Propagation Measurements
- 4 February 2022
Key Points
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Inversion employing a genetic algorithm solves for refractivity from point-to-point radar propagation measurements in a marine environment
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Inversion results scrutinized by comparison with other refractivity sources – numerical weather prediction, theory, and in-situ measurements
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Inversion solutions adequately remotely sense atmospheric refractivity in unstable and stable atmospheric regimes
Neutral air turbulence in the mesosphere and associated polar mesospheric summer echoes (PMSEs)
- 3 February 2022
Key Points
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The first true common volume observations of the PMSE source region with 4 radars are presented
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Full numerical simulation is used to study the neutral air turbulence coupling in the PMSE source region
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numerical results explain that small dust particles ∼3nm can resolve the observed radar echoes where the simple analytical models fall short
Single Waveguide Feed Omnidirectional and Circularly Polarized Transceiver Waveguide Slot Antenna for Satellite Communication Applications
- 1 February 2022
Key Points
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A transceiver antenna with single waveguide feed on satellites with high power telemetry, tracking and command applications
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Two sections of slotted arrays on a circular waveguide fed by a dual band rectangular to circular waveguide mod converter
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Omnidirectional and circular polarization characteristics for both transmit (telemetry) and receive (telecommand) frequencies
Modular Link Level Simulator for the Physical Layer of Beyond 5G Wireless Communication Systems
- 1 February 2022
Key Points
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A modular physical layer simulator for communication systems in the THz range according to IEEE 802.15.3d-2017 is presented and validated
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Link level simulations for a top-of-rack scenario show the impact of modulation and coding schemes, waveforms and RF impairments
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LOS conditions and strict requirements on linearity of RF devices are a prerequisite for higher order modulation schemes
A Regional SAR Dark Spot Detection Method based on GMTRJ Algorithm
- 25 January 2022
Key Points
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The feasibility and advantages of GMTRJ algorithm is demonstrated on simulating from the regional SAR dark sopt detection model
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The refined SAR dark spot detection operation can improve the detection accuracy of boundarious
Statistical Analysis of Refractive and Diffractive Scintillation at High Latitudes
- 25 January 2022
Key Points
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Phase scintillations at GPS frequencies can typically be considered as a stochastic Total Electron Content (TEC) eect at highlatitudes
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GNSS phase scintillation probability is hest at magnetic noon in the Cusphig
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Phase scintillation values increase as the propagation path off-B angle decreasesduring 6 to 15 MLT
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 improved equation for the radio refractive index of air
- Radio Science
- 803-807
- October 1974
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.
Long‐term observations of Schumann resonances at Modra Observatory
- Radio Science
- 27 January 2007
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
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.
Radio wave propagation through vegetation: Factors influencing signal attenuation
- Radio Science
- 7 October 2003
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
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
