METHOD OF SINGLE-CHANNEL RADIO DIRECTION FINDING OF QUASIHARMONIC SIGNALS WITH MINIMAL NUMBER OF IMMOBILE OMNIDIRECTIONAL ANTENNA ELEMENTS AND FACILITY FOR ITS REALIZATION

摘要

FIELD: radio engineering, radio engineering systems of automatic determination of angular coordinates of vector of direction of propagation of electromagnetic energy. SUBSTANCE: method is based on consistent execution of operations of ordering, multiplexing, amplification, frequency selection and demodulation, demultiplexing, computation of angle of coming of quasi-harmonic signal by value of arc tangent from ratio u₂/u₁ where ordered pair of signals from assemblage of ordered pairs of orthogonal signals is employed in the capacity of controlling signals f_i(t). Each ordered pair includes signals presenting sum of two harmonic oscillations with frequencies Ω₁ and Ω₂, computed by mathematical expressions. Signals in pairs display in time interval T_o simultaneously mutual frequency orthogonality between components with different frequencies and mutual phase orthogonality between components with same frequencies. Facility for realization of method has antenna system including four omnidirectional antenna elements positioned equidistantly along circumference, receiver of frequency-modulated signals, unit for multiplexing and modulation of phase, former of controlling orthogonal signals, unit for signal processing and information display comprising frequency Ω₁ rejection filter, first and second amplifiers, frequency Ω₂ rejection filter, loudspeaker, demultiplexing unit, former of reference signals, indication computing and controlling unit, indicator of bearing angle, indicator of amplitude level, former of starting pulse, controllable delay line and master generator. Facility built in compliance with another variant differs by number of omnidirectional antenna elements ( there should be 5 elements ) and use of amplitude modulation. EFFECT: enhanced precision of direction finding and possibility of control over quality of operation of direction finder. 3 cl, 5 dwg