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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
Effect of air-sea coupling electromagnetic propagation
Browse Articles
Resonance Scattering by a Circular Dielectric Cylinder
- 22 May 2021
Key Points
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Unified approach to the analysis of singularities of the scattered field and partial invisibility in the form of field-harmonic suppression
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Rigorous proof of the existence of complex resonances and partial-invisibility frequencies
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Contribution to the theory of cylindrical functions: novel proofs of the existence of zeros of cross products
Examining the Tolerance of GNSS Receiver Phase Tracking Loop Under the Effects of Severe Ionospheric Scintillation Conditions Based on Its Bandwidth
- 21 May 2021
Key Points
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Fading depth value of −15 dB is identified as critical threshold in the cycle slips occurrence
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Calculating the empirical mean time between cycle slip for each scintillation pattern and PLL bandwidth
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Determining the most suitable global navigation satellite systems receiver tracking loop bandwidth for reducing the occurrence of cycle slips
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
Data Assimilation Retrieval of Electron Density Profiles From Ionosonde Virtual Height Data
- 16 April 2021
Key Points
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New method to retrieve the bottom side electron density from virtual height data is developed based on Kalman filter equations
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The derivation of the Jacobian for virtual height data assimilation is presented
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The assimilative inversion of virtual height data outperforms the polynomial analysis inversion algorithm
Evaluation of Different Methods for Calculating the ROTI index over the Brazilian Sector
- 16 June 2021
Key Points
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We have compared five ROTI methods to evaluate the most suitable one for analyzing the equatorial ionospheric irregularities.
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ROTI index maps are a very effective resource for observing and characterizing plasma bubbles in the Brazilian sector.
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The irregularities observed in the ROTI index maps are more evident than in the TEC maps.
Precise Time Synchronization and Clock Comparison through a White Rabbit Network based optical fibre link
- 16 June 2021
Key Points
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An ultra- stable optical fibre link has been established utilizing White Rabbit (WR) network for precise transfer of time and frequency signals.
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Effect of ambient temperature variation on the performance of time and frequency transfer through the optical fibre link has been studied.
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Instability of the fibre link in terms of modified Allan deviation has been reached to 10-16 within one day of integration time.
Tomographic radio occultation methods applied to a dense cubesat formation in low Mars orbit
- 14 June 2021
Key Points
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Dense cubesat formations are a promising means to fill in gaps in the existing observation network
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Atmospheric tomography is an innovative method for the processing of overlapping cross-link radio occultation measurements
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Tomography derived products can provide valuable insight into the temperature and pressure structure in the lower Martian atmosphere
Ionospheric Scintillation Data Inversion to Characterize the Structures Associated with a Series of Polar Cap Patches
- 7 June 2021
Key Points
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Inversion of GPS ionospheric phase scintillation data indicates that for this case study the irregularities associated with a series of Polar Cap Patches are predominantly composed of electron density rods that are elongated along the magnetic field that are in some instances interbedded between sheets and wings.
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While wings and sheets of electron density irregularities can produce phase fluctuations, it is the apparent existence of rods that leads to higher values of phase scintillation.
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The spatial and temporal distribution of the axial ratio (AXR) values also indicates that the measured phase fluctuations increase roughly proportionally with AXR values for rods but remain constant for wings and sheets.
Innovative study of resistor shunt‐based bridged‐T topology with bandpass negative group delay behavior
- 3 June 2021
Key Points
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Bandpass negative group delay
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Circuit theory
Fast and accurate solution for the surface fields scattering of a dipole antenna placed on planar multi‐layered earth
- 21 May 2021
Key Points
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Closed-form formulae for Electromagnetic far-fields due to a VMD carrying uniform current and placed on a planar two-layered conducting earth have been derived.
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Numerical calculations of the field components are performed and illustrated.
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The results agreed with previous method, but it is fast and more accurate.
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Results can be used to evaluate numerical solutions of more complicated modeling algorithms, and will be useful for remote sensing and radar signal processing.
A Dual‐Polarized Frequency Selective Rasorber with Wide Transmission Band
- 14 April 2021
Key Points
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A miniaturized-element frequency selective surface is adopted to construct frequency selective rasorber with wide transmission band.
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The authors elaborate the working mechanism and design criteria of frequency selective rasorber with broad transmission band in detail.
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This work has a good merit of fewer lumped resistors used in the whole design compared to others, which is more practical in engineering.
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
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.
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
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
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.
Formulas of dielectric and total attenuations of a microstrip line
- Radio Science
- 5 October 2010
