A Broadband Spectral Analyzer of Cosmic Radio Emissions

<p>Scintillation of beacon satellite signals or distant cosmic radio emissions can provide interesting information on the cosmic medium itself, its internal spatial structure and basic evolution characteristics. LOFAR network gives consistent scintillation data with good coverage both in time and space and for the frequency range that goes down close to the local plasma frequency (LBA) being thus sensible to ionospheric plasma irregularities. LOFAR Scintillation measurements in the LBA range exhibit very interesting morphologies. Based on scintillation simulations using the phase screen method, including multiple scattering and refraction, we try to untangle the information contained in the full range (time, space, frequency) of LOFAR data and verify a number of hypotheses about the local structure of the ionosphere and its evolution.</p>

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A Backend System for Registering Narrowband Cosmic Radio Emissions

Instruments and Experimental Techniques ◽

10.1134/s0020441220040041 ◽

2020 ◽

Vol 63 (4) ◽

pp. 561-566

Author(s):

S. A. Grenkov ◽

N. E. Kol’tsov

Keyword(s):

Cosmic Radio ◽

Radio Emissions

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FSR Systems for Detection of Air Objects Using Cosmic Radio Emissions

Sensors ◽

10.3390/s21020465 ◽

2021 ◽

Vol 21 (2) ◽

pp. 465

Author(s):

Hristo Kabakchiev ◽

Vera Behar ◽

Ivan Garvanov ◽

Dorina Kabakchieva ◽

Avgust Kabakchiev ◽

...

Keyword(s):

Signal To Noise Ratio ◽

Cosmic Radio ◽

Joint Detection ◽

Signal To Noise ◽

Theoretical Possibility ◽

Forward Scatter ◽

Direct Signal ◽

Radio Emissions ◽

Detection Characteristics ◽

Scattering Signal

The paper analyses the possibility of Forward Scatter Radar (FSR) systems to detect airplanes using cosmic emission from pulsars and planets (pulsar, Sun, Moon). A suboptimal multichannel algorithm for joint detection and evaluation of the parameters of the forward scattering signal created by an airplane (duration and velocity) is proposed, with preliminary compensation of the powerful direct signal emitted by cosmic sources (pulsar, Sun and Moon). The expressions for calculation of the Signal-to-Noise Ratio (SNR) at the input of the detector and the compensator are obtained. The detection characteristics are also obtained, and the requirements for the suppression coefficient of the compensator are evaluated. A methodology for calculating the maximum distance for detecting an aircraft using a described algorithm is proposed. The obtained results show that due to the Forward Scatter (FS) effect, there is the theoretical possibility to detect airplanes at close ranges by FSRs, which use very weak signals from cosmic sources.

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