Results 111 to 120 of about 711 (146)
RMI-Dourbes ionosonde database - Status 2010
, 2011 Stankov, Stanimir +3 more
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Ionosond-MS ionosonde receiving antenna system
2020 7th All-Russian Microwave Conference (RMC), 2020The article contains description of the Ionosonde-MS chirp sounder receiving antenna system that was refined upon for instrumental separation of received signals of vertical and near-vertical incidence sounding based on polarization characteristics. The results of its modelling and measured characteristics in the entire range of working frequencies are
Aleksei Podlesnyi +2 more
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Journal of Atmospheric and Solar-Terrestrial Physics, 1999
Abstract Connecting ionosondes to the Internet gives easy access to real-time information on ionospheric conditions. Some of the ionosonde sites provide just the ionogram displays, others give in addition the scaled ionospheric characteristics directly usable for frequency management and HF channel assessment.
Ivan A Galkin +3 more
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Abstract Connecting ionosondes to the Internet gives easy access to real-time information on ionospheric conditions. Some of the ionosonde sites provide just the ionogram displays, others give in addition the scaled ionospheric characteristics directly usable for frequency management and HF channel assessment.
Ivan A Galkin +3 more
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Power Amplifier For Short-Pulse Ionosonde
2019 Russian Open Conference on Radio Wave Propagation (RWP), 2019© 2019 IEEE. Vertical sounding is a fairly informative method for studying the ionosphere at a relatively small transmitted power. Ones of the incompletely studied phenomena in the F layer are travelling ionospheric disturbances (TIDs). Especially poorly studied is their mid-latitude and medium-scale variety, or MSTIDs, which needs more frequent ...
Safiullin A., Akchurin A., Khasanov D.
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The universal digital ionosonde
Radio Science, 1978The digital ionospheric sounding system Digisonde 128PS explores ionospheric structure and dynamics by exploiting all observables of the reflected electromagnetic wave: range, amplitude, phase, Doppler, incidence angle, and wave polarization. The Digisonde operates in two complementary modes of observation: the Ionogram Mode with full range and ...
Klaus Bibl, Bodo W. Reinisch
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Comparison of the Traditional Ionosonde and the Digital Ionosonde Based on Direct Digitization
IEEE Geoscience and Remote Sensing Letters, 2017A new digital ionosonde based on direct digitization has been developed in the Electronic Information School of Wuhan University. There is no stage of frequency translation between the baseband and the radio frequency, and the realization of the direct digitization greatly simplifies the architecture to achieve optimized design. It is compared with the
Lei Qiao +3 more
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Special facilities of chirp ionosonde
2009 IEEE International Conference on Microwaves, Communications, Antennas and Electronics Systems, 2009In this work describe some new functional possibilities of chirp ionosonde in addition to building of oblique sounding ionograms. It is separation of signal and noise on output of receiver, detection of spectrum concentrate disturbance, rejection of spectrum concentrate disturbances and cleaning ionograms from strange signals, measuring characteristics
V.V. Shumaev, A.A. Kolchev, D.G. Shpak
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Advances in Space Research, 1981
Abstract In cooperation with RCA, Astro-Electronics Division, a digital spacecraft ionosonde has been developed and its prototype built by ULCAR. On-board use of the Direct Discrete Fourier Transform for signal-to-noise enhancement, suppression of unwanted echoes and the identification of echo properties permit several applications.
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Abstract In cooperation with RCA, Astro-Electronics Division, a digital spacecraft ionosonde has been developed and its prototype built by ULCAR. On-board use of the Direct Discrete Fourier Transform for signal-to-noise enhancement, suppression of unwanted echoes and the identification of echo properties permit several applications.
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Design of an Ultrawideband Ionosonde
IEEE Geoscience and Remote Sensing Letters, 2015In this letter, an ultrawideband ionospheric sounding system was designed for ionospheric research and communication channel management. The frequency band of this ionosonde ranges from high frequency to very high frequency. It can be flexibly used at both monostatic and bistatic stations as a GPS receiver module was integrated.
null Hengqing Sun +4 more
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