G.G. Vertogradov - Dr. Sc. (Phys.-Math.), Professor, JSC «KB «SVIAZ» (Rostov-on-Don) E-mail: vertogradovgg@gmail.com E.G. Chaika - Post-graduate Student, Part-programming Engineer, JSC «KB «SVIAZ» (Rostov-on-Don) E-mail: chayka.eg@gmail.com

In this paper we present the results of experimental investigations performed in radiophysical laboratory «Signal», Rostov-on-Don in the period from November 2013 to December 2015. The main purpose of this study was to measure the directions of arrival (DOA) variations of the various modes spread on mid-latitude paths of different length and orientation and also experimental evaluation of accuracy single-station location (SSL) to the radio emission source by various ways of setting the ionospheric conditions. In the expe-riment we used a multi-channel wide-aperture high-frequency (HF) direction finder (DF). In the first part of this study the time-frequency signal processing was extensively described, and also the procedure of detection and localization in the frequency domain. The techniques of separation HF field on the partial beams and modes are considered. The fol-lowing is a brief description of the hardware implementation of complex angular characteristics measurements, as well as set out the methodology and the experimental conditions. Next, a brief description of the hardware implementation of direction finder and the methodology and the experimental conditions are described. The following radio sources were selected as controlled: Broadcast radio in Minsk (frequency - 11730 kHz, paths length 1117 km) and Spain (21610 kHz, paths length 3512 km), time signal station RWM in Moscow (4996, 9996, 14996 kHz, paths length 1065 km) and special transmitter in Turkey (8052 kHz, paths length 981.7 km). The state of the ionosphere was controlled by open data of vertical sounding stations: DPS 4 and «Parus» in «IZMIRAN» and «Parus» in Rostov-on-Don. On the basis of this experiment was demonstrated, that angles deviations of partial modes reach values of 5 degree in the azimuth plane, and 10 degrees in the elevation plane. Such significant deviations of DOA associated with the traveling ionospheric disturbances (TID). TID-s movement leads to quasi-periodic variations in the angles of arrival of the partial beams forming the HF field in receiver site. As a result of continuous round the clock measurements for the 2013−2015 at one- and two-hop paths with the lengths of 900−3500 km found that the use of the IRI-2012 for SSL accompanied by the relative errors in range definition, which reach 22%. At the same time, the average SSL error for the entire period of measurement is about 13%. Application of vertical sounding data does not gain significant error reduction of radio-sources localization.

 

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