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Journal articles on the topic 'Atmospheric radio noise'

Author: Grafiati

Published: 28 May 2022

Last updated: 30 July 2025

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1

PODLESNYKH, D. A., and S. I. SHARAPOV. "ALGORITHMS FOR CONTROLLING AND FORECASTING THE INTENSITY OF ATMOSPHERIC RADIO NOISE FIELD EMISSIONS." Vestnik LSTU, no. 4 (2024): 10–13. https://doi.org/10.53015/30343275_2024_4_10.

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The article describes a system of controlling and forecasting lightning radio noises field emissions. Algorithms for controlling and forecasting the intensity of the field emissions are proposed. The measured and forecasted parameters of the lightning radio noise field emissions are compared.

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Lemmon, John J. "Wideband model of HF atmospheric radio noise." Radio Science 36, no. 6 (2001): 1385–91. http://dx.doi.org/10.1029/2000rs002364.

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Sivokon, V. P., and D. V. Lapshov. "SOFTWARE DEFINED RADIO TECHNOLOGY IN THE TASKS OF RADIONOISE CONTROL." Bulletin оf Kamchatka State Technical University, no. 58 (2021): 17–28. http://dx.doi.org/10.17217/2079-0333-2021-58-17-28.

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The article is dedicated to study of the atmospheric noise properties in the range of intermediate and decameter waves in the Western Bering Sea zone, where such observations were not carried out earlier. Since it is impossible to use the radio equipment of ships for such measurements, we used devices using the technology of software-defined radio systems. The measurements were carried out along the coast of Kamchatka and made it possible to establish the characteristic temporal, spatial and frequency variations in the parameters of atmospheric noise. It was found that the radio noise intensit

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4

Stober, G., C. Jacobi, and D. Keuer. "Distortion of meteor count rates due to cosmic radio noise and atmospheric particularities." Advances in Radio Science 8 (October 1, 2010): 237–41. http://dx.doi.org/10.5194/ars-8-237-2010.

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Abstract. The determination of the meteoroid flux is still a scientifically challenging task. This paper focusses on the impact of extraterrestrial noise sources as well as atmospheric phenomena on the observation of specular meteor echoes. The effect of cosmic radio noise on the meteor detection process is estimated by computing the relative difference between radio loud and radio quiet areas and comparing the monthly averaged meteor flux for fixed signal-to-noise ratios or fixed electron line density measurements. Related to the cosmic radio noise is the influence of D-layer absorption or in

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Witvliet, Ben A., Rosa M. Alsina-Pagès, David Altadill, Erik van Maanen, and Geert Jan Laanstra. "Separation of Ambient Radio Noise and Radio Signals Received via Ionospheric Propagation." Atmosphere 14, no. 3 (2023): 529. http://dx.doi.org/10.3390/atmos14030529.

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Systems for atmospheric research and wireless communication use the High Frequency (HF) radio spectrum. At these frequencies, typically up to 20 MHz, the ambient electromagnetic noise is stronger than the noise generated by the receiver itself, thereby limiting the sensitivity of the instruments. Especially in urban areas, the noise level is high. In remote rural environments, where artificial noise sources are absent, a much lower noise level is observed. It has been shown that this noise arrives via ionospheric propagation and consists of impulsive noise from lightning and a background compo

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Gramigna, Edoardo. "Calibration Techniques for Studying Venus and Mars Atmospheres." Aerotecnica Missili & Spazio 99, no. 4 (2020): 255–61. http://dx.doi.org/10.1007/s42496-020-00066-y.

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AbstractThe European Space Agency Venus Express mission (VEX) was sent to Venus in 2005 to unveil the unsolved mysteries regarding its atmosphere, the plasma environment and its temperatures. Radio occultation experiments performed by VeRa radio science instrument probed the planet’s atmosphere by studying the frequency shift on the radio signal sent by the spacecraft to Earth-based ground stations. This study carries out the calibration of the radio frequencies within a radio occultation experiment in order to correct the main sources of error as: thermal noise, spacecraft clock, spacecraft t

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Rao, S. Vijaya Bhaskara, T. Rama Rao, V. Gunasekhara Reddy, et al. "HF radio signal fading and atmospheric radio noise measurements at low latitudes." Radio Science 37, no. 5 (2002): 16–1. http://dx.doi.org/10.1029/2001rs002495.

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Constantinides, Antonios, Saam Najat, and Haris Haralambous. "Atmospheric Ducting Interference on DAB, DAB+ Radio in Eastern Mediterranean." Electronics 11, no. 24 (2022): 4183. http://dx.doi.org/10.3390/electronics11244183.

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A serious problem affecting the local radio industry in Cyprus is radio interference from the Middle East. This problem is especially acute on the highway along the coast during the summer months because interference degrades the sound quality in vehicle receivers due to chirping noise, hissing, fading and distortion. During the last decade the issue was explored by monitoring the field strength intensity of unwanted signals with respect to atmospheric conditions that excacerbate interference. According to the research outcomes presented in this paper, severe interference occurs due to “Tropos

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9

Moro, Jeffrey. "Sensing sferics: Electromagnetic noise and environmental signal." Journal of Environmental Media 5, no. 1 (2024): 27–41. http://dx.doi.org/10.1386/jem_00118_1.

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Each time lightning bursts in the Earth’s atmosphere, it releases radio waves that ricochet between the planet’s surface and its ionosphere, a layer of charged air lying between 80 km and 1000 km above our heads. This article explores these radio atmospheric signals, or ‘sferics’, across a range of media and sound arts. It argues that even as artists idealize sferics as a direct path to a kind of planetary unconscious, there remain attempts to incorporate sferics within existing cultural models of both quantitative and qualitative data. These models insist that environmental phenomena, no matt

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10

Bouleanu, Iulian, and Vlad-Cosmin Vasile. "Software Define Radio System for HF Noise Measurements." International conference KNOWLEDGE-BASED ORGANIZATION 23, no. 3 (2017): 18–23. http://dx.doi.org/10.1515/kbo-2017-0150.

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AbstractAccurate noise estimation in the HF band is a defining aspect in the evaluation of SNR for communication links. The reference document that specifies how different types of electromagnetic noise can be taken into account by radio communication system planners is the ITU-R Recommendation P.372.Meanwhile a series of studies have demonstrated that Gaussian noise in the HF band is not always valid because this band noise is strongly affected by atmospheric emission sources such as lightning impulse. This leads to the idea that a distribution suited to express the noise variance is the Bi-K

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11

Hocke, K. "Inversion of GPS meteorology data." Annales Geophysicae 15, no. 4 (1997): 443–50. http://dx.doi.org/10.1007/s00585-997-0443-1.

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Abstract. The GPS meteorology (GPS/MET) experiment, led by the Universities Corporation for Atmospheric Research (UCAR), consists of a GPS receiver aboard a low earth orbit (LEO) satellite which was launched on 3 April 1995. During a radio occultation the LEO satellite rises or sets relative to one of the 24 GPS satellites at the Earth's horizon. Thereby the atmospheric layers are successively sounded by radio waves which propagate from the GPS satellite to the LEO satellite. From the observed phase path increases, which are due to refraction of the radio waves by the ionosphere and the neutra

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12

Shchukin, G. G., E. V. Fedoseeva, V. V. Bulkin, and I. N. Rostokin. "Microwave Radiometric System in Problems of Forecasting Hazardous Atmospheric Phenomena." Радиотехника и электроника 68, no. 6 (2023): 598–607. http://dx.doi.org/10.31857/s003384942306013x.

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The main directions of improving radiometric microwave systems for solving problems of ultrashort-term forecasting of the development of adverse and dangerous atmospheric weather phenomena are shown, which consist in solving problems of compensating for the influence of background noise, digital processing of output signals, and including radio-photonic paths and a neural network in the system. The results of correlation processing of data from remote sensing of the surface layer of an inhomogeneous atmosphere in three frequency ranges are presented.

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Sokolovskiy, Sergey, Zhen Zeng, Douglas C. Hunt, et al. "Detection of Superrefraction at the Top of the Atmospheric Boundary Layer from COSMIC-2 Radio Occultations." Journal of Atmospheric and Oceanic Technology 41, no. 1 (2024): 65–78. http://dx.doi.org/10.1175/jtech-d-22-0100.1.

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Abstract Superrefraction at the top of the atmospheric boundary layer introduces problems for assimilation of radio occultation data in weather models. A method of detection of superrefraction by spectral analysis of deep radio occultation signals introduced earlier has been tested using 2 years of COSMIC-2/FORMOSAT-7 radio occultation data. Our analysis shows a significant dependence of the probability of detection of superrefraction on the signal-to-noise ratio, which results in a certain sampling nonuniformity. Despite this nonuniformity, the results are consistent with the known global dis

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14

Zeng, Zhen, Sergey Sokolovskiy, William S. Schreiner, and Doug Hunt. "Representation of Vertical Atmospheric Structures by Radio Occultation Observations in the Upper Troposphere and Lower Stratosphere: Comparison to High-Resolution Radiosonde Profiles." Journal of Atmospheric and Oceanic Technology 36, no. 4 (2019): 655–70. http://dx.doi.org/10.1175/jtech-d-18-0105.1.

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AbstractGlobal positioning system (GPS) radio occultation (RO) is capable of retrieving vertical profiles of atmospheric parameters with high resolution (<100 m), which can be achieved in spherically symmetric atmosphere. Horizontal inhomogeneity of real atmosphere results in representativeness errors of retrieved profiles. In most cases these errors increase with a decrease of vertical scales of atmospheric structures and may not allow one to fully utilize the physical resolution of RO. Also, GPS RO–retrieved profiles are affected by observational noise of different types, which, in turn,

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15

Jain, V. K., and S. N. Gupta. "Impulsive Atmospheric Radio Noise in Digital Communications—A Problem for Tropics." IETE Technical Review 2, no. 10 (1985): 327–32. http://dx.doi.org/10.1080/02564602.1985.11437836.

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16

Nakai, Taketoshi. "Amplitude probability distributions and impulse amplitude distributions for impulsive noise: Atmospheric radio noise from a near thunderstorm and automotive radio noise from a roadway." Radio Science 21, no. 2 (1986): 223–34. http://dx.doi.org/10.1029/rs021i002p00223.

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17

Popova, Kateryna, and Tomáš Prošek. "Corrosion Monitoring in Atmospheric Conditions: A Review." Metals 12, no. 2 (2022): 171. http://dx.doi.org/10.3390/met12020171.

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A variety of techniques are available for monitoring metal corrosion in electrolytes. However, only some of them can be applied in the atmosphere, in which case a thin discontinuous electrolyte film forms on a surface. In this review, we describe, evaluate and compare both traditional and state-of-the-art real-time corrosion monitoring techniques to identify those suitable for atmospheric conditions. For atmospheric corrosion monitoring (ACM), electrochemical impedance spectroscopy (EIS), electrochemical noise (EN), electrical resistance (ER) probes, quartz crystal microbalance (QCM), radio-fr

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18

GERE, I. "Atmospheric Noise Measurements in the Garden: Detecting Universalities in Inter-Spheric Waiting Time Statistics." Romanian Journal of Physics 69, no. 3-4 (2024): 804. http://dx.doi.org/10.59277/romjphys.2024.69.804.

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Lightning flashes result in an instantaneous emission of electromagnetic (EM) waves that encompass a broad spectrum of frequencies in the domain of radio waves. The signature of these impulses in the region of the very low frequency (VLF) of radio waves and bellow are called spherics. These impulsive signals traverse great distances in the waveguide between the Earth’s ionosphere and its surface. Due to the abundance of lightnings the lower end of the EM spectrum is dominated by the waveforms of these emission. It is called atmospheric radio noise because of its origin. This article outlines a

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19

ANTYUFEYEV, O., M. BLEIDERS, O. PATOKA, V. BEZRUKOVS, I. SHMELD, and V. SHULGA. "Atmospheric opacity correction in C-band at Irbene RT-16 radio telescope." Astronomical and Astrophysical Transactions, Volume 33, Numéro 2 (August 8, 2022): 103–12. http://dx.doi.org/10.17184/eac.6473.

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The method (Kraus (2007)) for correcting atmospheric opacity in the C-band was applied to the RT-16 radio telescope of the Irbene observatory. The method is based on the calculation of the noise temperature T0, which is almost independent of the environment and is determined by the characteristics of the receiver and radio telescope antenna. T0 is determined using sky dip observations. The atmospheric opacity in the zenith is calculated using T0. We have determined the time dependence of T0 over a long period of time. It is shown that the T0 error increases the error of the flux density by no

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20

Sokolovskiy, S., W. Schreiner, C. Rocken, and D. Hunt. "Optimal Noise Filtering for the Ionospheric Correction of GPS Radio Occultation Signals." Journal of Atmospheric and Oceanic Technology 26, no. 7 (2009): 1398–403. http://dx.doi.org/10.1175/2009jtecha1192.1.

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Abstract GPS radio occultation remote sensing of the neutral atmosphere requires ionospheric correction of L1 and L2 signals. The ionosphere-corrected variables derived from radio occultation signals—such as the phase, Doppler, and bending angle—are affected by small-scale ionospheric effects that are not completely eliminated by the ionospheric correction. They are also affected by noise from mainly the L2 signal. This paper introduces a simple method for optimal filtering of the L4 = L1 − L2 signal used to correct the L1 signal, which minimizes the combined effects of both the small-scale io

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21

Rasch, Joel, Anders Carlström, Jacob Christensen, and Thomas Liljegren. "The GRAS-2 radio occultation mission." Atmospheric Measurement Techniques 17, no. 20 (2024): 6213–22. http://dx.doi.org/10.5194/amt-17-6213-2024.

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Abstract. The second generation of the Global navigation satellite system Receiver for Atmospheric Sounding (GRAS-2) is a radio occultation (RO) instrument which is capable of providing 2000 atmospheric profiles per day. The instrument is hosted on all satellites in the MetOp Second Generation (MetOp-SG) series for polar orbit operation. The GRAS-2 instruments provide occultation measurements from the Galileo, GPS, and BeiDou satellites at their common frequencies centred at 1575.42 MHz (L1) and 1176.45 MHz (L5). Using high-gain antennas and an ultra-stable oscillator, neutral bending angles a

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22

Kabanov, V. V. "Formation of atmospheric radio noise fluctuating component in the ELF-VLF range." Radiophysics and Quantum Electronics 31, no. 6 (1988): 473–79. http://dx.doi.org/10.1007/bf01044649.

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23

SEN, AK. "Enhancement of Atmospherics in relation to pre-monsoon and monsoon Thunderstorms." MAUSAM 18, no. 4 (2022): 447–58. http://dx.doi.org/10.54302/mausam.v18i3.4671.

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Enhancements of atmospherics associated with local thunderstorms occurring in a tropical station. Calcutta, were studied on 30 kc/s. The various stages of an enhancement were correlated with the different stages of development of thunderclouds occurring in the rainy seasons. The results show an association of a sudden increase and sudden decrease of atmospherics in the pre-monsoon and monsoon seasons respectively with precipitation. Atmospherics activity noticed early m the process of development of clouds before any precipitation occurs and even before the cloud has, perhaps, developed up to

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24

Klimenko, V. V., and E. A. Mareev. "Anomalous Decimeter Radio Noise from the Region of the Atmospheric Front: I. Characteristics of the Detected Radio Noise and Meteorological Parameters of the Frontal Cloudiness." Izvestiya, Atmospheric and Oceanic Physics 54, no. 2 (2018): 147–53. http://dx.doi.org/10.1134/s0001433818020135.

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McGuffin, Dana L., Philip J. Cameron-Smith, Matthew A. Horsley, et al. "Stratospheric temperature measurements from nanosatellite stellar occultation observations of refractive bending." Atmospheric Measurement Techniques 16, no. 8 (2023): 2129–44. http://dx.doi.org/10.5194/amt-16-2129-2023.

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Abstract. Stellar occultation observations from space can probe the stratosphere and mesosphere at a fine vertical scale around the globe. Unlike other measurement techniques like radiosondes and aircraft, stellar occultation has the potential to observe the atmosphere above 30 km, and unlike radio occultation, stellar occultation probes fine-scale phenomena with potential to observe atmospheric turbulence. We imaged the refractive bending angle of a star centroid for a series of occultations by the atmosphere. Atmospheric refractivity, density, and then temperature are retrieved from the bend

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Kabanov, V. V. "Effect of the group structure of atmospheric radio noise on its statistical characteristics." Radiophysics and Quantum Electronics 33, no. 5 (1990): 406–10. http://dx.doi.org/10.1007/bf01045405.

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27

Poguntke, Tim, and Christoph Ritter. "Influence of electromagnetic interference on the evaluation of lidar-derived aerosol properties from Ny-Ålesund, Svalbard." Atmospheric Measurement Techniques 16, no. 17 (2023): 4009–14. http://dx.doi.org/10.5194/amt-16-4009-2023.

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Abstract. Possible interference sources for our aerosol lidar setup with transient recorders have been assessed. This was done by two methods: a spectrum analysis of the lidar signals in order to detect radio-frequency interference and measurements of the electromagnetic interference caused by the laser power supply. We found disturbances in the analog channels of the transient recorders, presumably caused by aging effects of our older recorders. An easy method on how the signal-to-noise ratio can be improved retrospectively is presented. We also show that the usage of two-way radio at our loc

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28

LaBelle, J. "Radio noise of auroral origin: 1968–1988." Journal of Atmospheric and Terrestrial Physics 51, no. 3 (1989): 197–211. http://dx.doi.org/10.1016/0021-9169(89)90101-3.

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29

Lestrade, Jean-François, Alan E. E. Rogers, Arthur E. Niell, and Robert A. Preston. "Astrometry of Millijansky Sources Using A Phase Reference VLBI Technique." Symposium - International Astronomical Union 129 (1988): 323–24. http://dx.doi.org/10.1017/s0074180900134850.

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Atmospheric fluctuations and hydrogen maser clock instabilities limit the coherence time (Tcoh) and hence the signal-to-noise ratio of VLBI data , to a few minutes at GHz frequencies. However, Tcoh can be increased up to many hours if a phase reference is established throughout the experiment by using a strong source observed alternatively with the program source. Weak celestial radio sources with flux densities in the milliJansky range at centimeter wavelengths, such as radio stars, fast pulsars and faint components of extragalactic sources, can then be reliably detected by this VLBI techniqu

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30

Larsen, Jakob Juul, Stine Søgaard Pedersen, Nikolaj Foged, and Esben Auken. "Suppression of very low frequency radio noise in transient electromagnetic data with semi-tapered gates." Geoscientific Instrumentation, Methods and Data Systems 10, no. 1 (2021): 81–90. http://dx.doi.org/10.5194/gi-10-81-2021.

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Abstract. The transient electromagnetic method (TEM) is widely used for mapping subsurface resistivity structures, but data are inevitably contaminated by noise from various sources. It is common practice to gate signals from TEM systems to reduce the amount of data and improve the signal-to-noise ratio (SNR). Gating acts as a filter, and optimum gating will pass the TEM signal un-attenuated while suppressing noise. In systems based on analog boxcar integrators, the gating corresponds to filtering with a square window. The frequency response of this window shape has large side lobes, which are

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Witvliet, Ben A. "Gap Analysis of Ambient Electromagnetic Noise Measurements Stored in the ITU Data Banks." Sensors 24, no. 21 (2024): 6832. http://dx.doi.org/10.3390/s24216832.

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For any radio frequency (RF) sensor (receiver) to function optimally, the ambient noise field strength, converted to electrical power by the transducer (antenna), must be lower than the in-ternal noise of that sensor. Therefore, knowledge of the expected ambient noise level is essential for the design of sensors for earth observation, atmospheric research, radio astronomy or navigation. The International Telecommunication Union (ITU) provides a model that predicts ambient man-made noise levels, differentiated by frequency, origin and environment. This is entirely empirical model is based on da

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32

Klimenko, V. V., and E. A. Mareev. "Anomalous Decimeter Radio Noise from the Region of the Atmospheric Front: II. On the Nonthermal Mechanism of UHF Noise." Izvestiya, Atmospheric and Oceanic Physics 54, no. 4 (2018): 380–85. http://dx.doi.org/10.1134/s0001433818040254.

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33

Hayakawa, Masashi, and Alexander P. Nickolaenko. "Variations of Atmospheric ELF/VLF Radio Noise Due to Seismogenic Modifications in Tropospheric Conductivity." Open Journal of Earthquake Research 13, no. 02 (2024): 113–32. http://dx.doi.org/10.4236/ojer.2024.132005.

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McKay, Derek, Juha Vierinen, Antti Kero, and Noora Partamies. "On the determination of ionospheric electron density profiles using multi-frequency riometry." Geoscientific Instrumentation, Methods and Data Systems 11, no. 1 (2022): 25–35. http://dx.doi.org/10.5194/gi-11-25-2022.

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Abstract. Radio wave absorption in the ionosphere is a function of electron density, collision frequency, radio wave polarisation, magnetic field and radio wave frequency. Several studies have used multi-frequency measurements of cosmic radio noise absorption to determine electron density profiles. Using the framework of statistical inverse problems, we investigated if an electron density altitude profile can be determined by using multi-frequency, dual-polarisation measurements. It was found that the altitude profile cannot be uniquely determined from a “complete” measurement of radio wave ab

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35

Khare, Smith Kashiram, Paul McLachlan, Pradip Kumar Maurya, and Jakob Juul Larsen. "An optimized and hybrid gating scheme for the suppression of very low-frequency radios in transient electromagnetic systems." Geoscientific Instrumentation, Methods and Data Systems 13, no. 1 (2024): 27–41. http://dx.doi.org/10.5194/gi-13-27-2024.

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Abstract. One of the most widely used approaches for measuring the earth's subsurface resistivity is the transient electromagnetic (TEM) method. However, noise and interference from different sources, e.g., radio communication, the instrument, the atmosphere, and power lines, severely taint these types of signals. In particular, radio transmission in the very low-frequency (VLF) range between 3 and 30 kHz is one of the most prominent sources of noise. Transient electromagnetic signals are normally gated to increase the signal-to-noise ratio. A precise selection of gate shapes is required to su

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Kane, R. P. "Sunspots, solar radio noise, solar EUV and ionospheric." Journal of Atmospheric and Terrestrial Physics 54, no. 3-4 (1992): 463–66. http://dx.doi.org/10.1016/0021-9169(92)90025-g.

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Schreiner, W., S. Sokolovskiy, D. Hunt, C. Rocken, and Y. H. Kuo. "Analysis of GPS radio occultation data from the FORMOSAT-3/COSMIC and Metop/GRAS missions at CDAAC." Atmospheric Measurement Techniques Discussions 4, no. 2 (2011): 2433–89. http://dx.doi.org/10.5194/amtd-4-2433-2011.

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Abstract. This study investigates the noise level and mission-to-mission stability of Global Positioning System (GPS) radio occultation (RO) neutral atmospheric bending angle data at the UCAR COSMIC Data Analysis and Archive Center (CDAAC). Data are used from two independently developed RO instruments currently flying in orbit on the FORMOSAT-3/COSMIC (F3C) and Metop/GRAS (GNSS Receiver for Atmospheric Sounding) missions. The F3C 50 Hz RO data are post-processed with a single-difference excess atmospheric phase algorithm, and the Metop/GRAS 50 Hz closed loop and raw sampling (down-sampled from

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Schreiner, W., S. Sokolovskiy, D. Hunt, C. Rocken, and Y. H. Kuo. "Analysis of GPS radio occultation data from the FORMOSAT-3/COSMIC and Metop/GRAS missions at CDAAC." Atmospheric Measurement Techniques 4, no. 10 (2011): 2255–72. http://dx.doi.org/10.5194/amt-4-2255-2011.

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Abstract. This study investigates the noise level and mission-to-mission stability of Global Positioning System (GPS) radio occultation (RO) neutral atmospheric bending angle data at the UCAR COSMIC Data Analysis and Archive Center (CDAAC). Data are used from two independently developed RO instruments currently flying in orbit on the FORMOSAT-3/COSMIC (F3C) and Metop/GRAS (GNSS Receiver for Atmospheric Sounding) missions. The F3C 50 Hz RO data are post-processed with a single-difference excess atmospheric phase algorithm, and the Metop/GRAS 50 Hz closed loop and raw sampling (down-sampled from

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Stober, G., W. Singer, and Ch Jacobi. "Cosmic radio noise observations using a mid-latitude meteor radar." Journal of Atmospheric and Solar-Terrestrial Physics 73, no. 9 (2011): 1069–76. http://dx.doi.org/10.1016/j.jastp.2010.07.018.

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Liu, Min, Lue Chen, Nianchuan Jian, et al. "Preliminary Estimations of Mars Atmospheric and Ionospheric Profiles from Tianwen-1 Radio Occultation One-Way, Two-Way, and Three-Way Observations." Remote Sensing 15, no. 23 (2023): 5506. http://dx.doi.org/10.3390/rs15235506.

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The radio occultation method, one of the methods used to provide planetary atmospheric profiles with high vertical resolution, was applied to China’s first Mars mission, Tianwen-1. We carried out observations based on the Chinese Deep Space Network, and one-way, two-way, and three-way modes were used for Doppler observations from the Tianwen-1 spacecraft. We successfully obtained effective observations from Tianwen-1 on 22 and 25 March 2022. An inversion system developed for Tianwen-1 radio occultation observations enabled the derivation of neutral atmospheric density, pressure, temperature, a

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Volkov, V., O. Korolev та V. Zakharenko. "A 20…25 GHZ RANGE RADIOMETER ( λ = 1.35 cm) FOR INTEGRAL TROPOSPHERIC ABSORPTION MEASUREMENTS". Radio physics and radio astronomy 29, № 3 (2024): 229–35. http://dx.doi.org/10.15407/rpra29.03.229.

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Subject and Purpose. The current research projects in astrophysics are in need of high-sensitivity scientific instruments. The accuracy and sensitivity of observations can be enhanced through the use of large radio telescopes and other radio frequency systems, as well as via application of diagnostic instruments intended for exploring the radio propagation conditions along the signal paths. The paths traverse all of the Earth’s outer structural shells, from the atmosphere to remote layers of the magnetosphere. The present work is aimed at developing a highly sensitive off-set radiometer, opera

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Renkwitz, T., W. Singer, R. Latteck, and M. Rapp. "Multi beam observations of cosmic radio noise using a VHF radar with beam forming by a Butler matrix." Advances in Radio Science 9 (August 1, 2011): 349–57. http://dx.doi.org/10.5194/ars-9-349-2011.

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Abstract. The Leibniz-Institute of Atmospheric Physics (IAP) in Kühlungsborn started to install a new MST radar on the North-Norwegian island Andøya (69.30° N, 16.04° E) in 2009. The new Middle Atmosphere Alomar Radar System (MAARSY) replaces the previous ALWIN radar which has been successfully operated for more than 10 years. The MAARSY radar provides increased temporal and spatial resolution combined with a flexible sequential point-to-point steering of the radar beam. To increase the spatiotemporal resolution of the observations a 16-port Butler matrix has been built and implemented to the

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Lefort Borges, Cícero, and Manuel Luís Barreira Martinez. "Using radio frequency and ultrasonic antennas for inspecting pin-type insulators on medium-voltage overhead distribution lines." Ingeniería e Investigación 33, no. 2 (2013): 63–69. http://dx.doi.org/10.15446/ing.investig.v33n2.39519.

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This paper summarises the activities undertaken when using antennas (ultrasound and radiofrequency) for identifying insulators in pre-failure state by detecting the noise emitted by the distribution line and correlating this with these insulators (porcelain pin type) dielectric breakdown. This has led to developing low-cost maintenance procedures and providing support and criteria for engineering decisions regarding replacing these insulators. The technique used two detectors; a radio frequency detector was used in a first investigation of a particular distribution line, set to 40 MHz and inst

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Yevseiev, Serhii, Serhii Herasymov, Oleksandr Kuznietsov, et al. "Method of assessment of frequency resolution for aircraft." Eastern-European Journal of Enterprise Technologies 2, no. 9 (122) (2023): 34–45. http://dx.doi.org/10.15587/1729-4061.2023.277898.

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The object of the study is to evaluate the quality of the frequency distribution of aircraft, which characterizes the effectiveness of radar surveillance of aircraft and determines the effectiveness of their control using radio signals. The frequency resolution of an aircraft is usually studied using the frequency ambiguity function for a coherent packet of radio pulses. However, there is a problem of estimating phase fluctuations, which is caused by the heterogeneity of the propagation of radio pulses, which affects the functioning of radar stations under different atmospheric conditions. A f

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Serhii, Yevseiev, Herasymov Serhii, Kuznietsov Oleksandr, et al. "Method of assessment of frequency resolution for aircraft." Eastern-European Journal of Enterprise Technologies 2, no. 9(122) (2023): 34–45. https://doi.org/10.15587/1729-4061.2023.277898.

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The object of the study is to evaluate the quality of the frequency distribution of aircraft, which characterizes the effectiveness of radar surveillance of aircraft and determines the effectiveness of their control using radio signals. The frequency resolution of an aircraft is usually studied using the frequency ambiguity function for a coherent packet of radio pulses. However, there is a problem of estimating phase fluctuations, which is caused by the heterogeneity of the propagation of radio pulses, which affects the functioning of radar stations under different atmospheric conditions. A f

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Herman, J. R., A. A. Giordano, X. A. DeAngelis, K. F. Marzotto, and F. M. Hsu. "Measurement and statistical analysis of wideband MF atmospheric radio noise: 1. Structure and distribution and time variation of noise power." Radio Science 21, no. 1 (1986): 25–46. http://dx.doi.org/10.1029/rs021i001p00025.

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Granger, Jesse, Lucianne Walkowicz, Robert Fitak, and Sönke Johnsen. "Gray whales strand more often on days with increased levels of atmospheric radio-frequency noise." Current Biology 30, no. 4 (2020): R155—R156. http://dx.doi.org/10.1016/j.cub.2020.01.028.

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Nielsen, E., F. Honary, and M. Grill. "Time resolution of cosmic noise observations with acorrelation experiment." Annales Geophysicae 22, no. 5 (2004): 1687–89. http://dx.doi.org/10.5194/angeo-22-1687-2004.

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Abstract. A radio wave correlation experiment using a Mills Cross technique can be used to observe the cosmic noise intensity from the ground for the purpose of determining the absorption in the ionosphere. To ensure a time resolution of 10 to 20s of the absorption observations, it is necessary that the autocorrelation function of the signal received within a wanted spatial resolution and in a given receiver is >8% of the total signal amplitude incident on that receiver.Key words. Radio Science (Instruments and techniques; Interferometry; Ionospheric physics)

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Корсаков, А. А., та В. И. Козлов. "Регистрация ионосферных возмущений с помощью приёма сигналов радиостанций РСДН-20". Vestnik of Volga State University of Technology. Series Radio Engineering and Infocommunication Systems, № 3(59) (20 листопада 2023): 6–20. https://doi.org/10.25686/2306-2819.2023.3.6.

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При мониторинге грозовой активности возникает неоднозначность интерпретации регистрируемых вариаций интенсивности естественных ОНЧ-сигналов. Неоднозначность можно исключить при одновременном приёме со схожих радиотрасс естественных и эталонных ОНЧ-радиосигналов. Приведены методика и результаты регистрации интенсивности радиошума, амплитуды и фазы радиосигналов навигационной системы РСДН-20 на частоте 11,904 кГц. Оценка межгодовых вариаций интенсивности источников радиошума в летний период с 2009 по 2017 гг. показала нарастание на 4 дБ днём и ночью. Проведена адаптация параметров регрессионной

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Cho, John Y. N. "A New Radio Frequency Interference Filter for Weather Radars." Journal of Atmospheric and Oceanic Technology 34, no. 7 (2017): 1393–406. http://dx.doi.org/10.1175/jtech-d-17-0028.1.

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AbstractA new radio frequency interference (RFI) filter algorithm for weather radars is proposed in the two-dimensional (2D) range-time/sample-time domain. Its operation in 2D space allows RFI detection at lower interference-to-noise or interference-to-signal ratios compared to filters working only in the sample-time domain while maintaining very low false alarm rates. Simulations and real weather radar data with RFI are used to perform algorithm comparisons. Results are consistent with theoretical considerations and show the 2D RFI filter to be a promising addition to the signal processing ar

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