S. N. Razin´kov - Dr.Sc. (Phys.-Math.), Senior Research Scientist, Leading Research Scientist, Air Force Academy n.a. Prof. N.E. Zhukovsky and Yu.A. Gagarin (Voronezh). E-mail: razinkovsergey@rambler.ru Ye. A. Reshetnyak - Head of Department - Deputy Director, Air Force Academy n.a. Prof. N.E. Zhukovsky and Yu.A. Gagarin (Voronezh). E-mail: reshetnyakea@bk.ru

In this paper the experimental assessment of operational accuracy of fixing of HF radiation sources in the triangulation system with azimuth and meridian direction finders has been carried out. The goniometric way of assessment of object coordinates is characterized by higher precision in comparison with a goniometric and ranging way, based on direction finding of signals from one position and calculation of range to the points of reflection from ionosphere on the propagation path. During the summer period the direction finders were developed in the Central and North-West federal districts at a distance of 1000 km; during the winter period measurements were taken at placement of reception posts in the Central and Southern federal districts with base of direction finding up to 500 km; range to radiation sources from the center of direction finding base was from 200 km to 6500 km. Assessment of location of a radiation source was coordinates at which the maximum of density of their distribution was reached. The mean square error of fixing of an object was calculated as a expectation value of square of deviation of measurement results from the received assessment of coordinates in degree of 0,5. The errors of measurement of coordinates of radio stations of meteo-information of airfield networks, standard frequencies and time, transmitters of telecode and continuous messages have been investigated. It has been shown that accuracy of carried out measurements significantly depends on the frequency of the processed signals and a geometrical factor of a triangulation system. The error of fixing of objects increases in proportion to the relation of range up to them in the second degree and base of direction finding.

 

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