DIGITAL RADIO DIRECTION FINDER Russian patent published in 1998 - IPC

FIELD: radio engineering, radio navigation, direction finding to source of radiation. SUBSTANCE: proposed digital radio direction finder has antenna unit 1, first and second radio receivers 2₁ and 2₂, analog-to-digital converters 3₁ and 3₂, buffer storing devices 5₁ and 5₂, units 6₁ and 6₂ of discrete Fourier transform, weight processing unit 7, unit 10 computing bearings and unit 12 of reference frequencies. It is supplemented with third radio receiver 2₃, third analog-to-digital converter 3₃, third buffer storing device 5₃, third unit 6₃ of discrete Fourier transform, control units 4, covariance matrix 8, units 9 and 11 of matrix processing and weight coefficients. Antenna unit includes first, second and third antennas. Process of reception of information on parameters of position line has been changed in proposed direction finder. Enhanced noise immunity is achieved thanks to isolation of maximum component of spectrum of signal. Possibility of separate direction finding of components of two-mode field is ensured by time averaging of covariance matrix of signal and by use of Pisarenko method for determination of angles of arrival of radio signals. EFFECT: increased accuracy of direction finding to modulated radio signals with unknown structures in short-wave range including conditions of two-mode propagation of radio waves. 1 cl, 42 dwg