REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

An approach for development of EOB application in direction finder for HF frequency rangE

GORAN KRUNIĆ

RT-RK doo, Novi Sad, goran.krunic@rt-rk.com

UGLJEŠA DRAGIŠIĆ

RT-RK doo, Novi Sad, ugljesa.dragisic@rt-rk.com

Željko jurca

RT-RK doo, Novi Sad, zeljko.jurca@rt-rk.com

Tomislav maruna

RT-RK doo, Novi Sad, tomislav.maruna@rt-rk.com

Abstract: In this paper will be exposed a software solution of the application for Electronic order of battle (EOB) in HERA wideband direction-finder for HF radio-frequency. The EOB application is the subsystem on the top of hierarchy of data processing in the HERA direction-finders network. The EOB application collects all required and previously prepared data from all available, particular direction-finders and creates “the picture” of radio- transmitters activity, recognizes them as the white-list-location or as the black-list-location, examines their affiliation to known or unknown radio-networks, and displays them on several different ways: on the georeferenced map, on the PTT diagram, on the table and on docking property window. Input data for EOB application are previously processed data about emissions, from segmentation subsystems of all available direction-finders. Transmitter location is result of the spherical triangulation (in case that emission data are available from at least two direction-finders) with minimum RMS method, or as result of SSL method (in case that the available data about ionosphere and azimuth and elevation comes from only one direction-finder). If neither of the above mentioned data set is available, only the azimuth of the emissions/transmitters will be presented.

Keywords: direction-finder, electronic order of battle, spherical triangulation, SSL, azimuth, elevation.