Moving Objects Parameters Estimation Based on Direction Finding of Broadcasting HF Radio Stations Scattered Radiation

A multi-channel wide-aperture HF direction finder operating in the Doppler beam separation mode is used to solve the problems of passive coherent location when a moving object in the Earth's atmosphere is illuminated by the radiation of broadcasting radio stations. The developed model of signals radiated by broadcasting radio stations, which takes into account the characteristics of HF propagation in the ionosphere, makes it possible to estimate the spatial trajectory of a moving object from single receiving point using the direction finding results. It is shown that the used radio direction finder, together with the developed model, allows one to solve the problems of detecting and tracking objects at distances of at least 60 km.