METHOD OF DETERMINING THE EMITTER OR DIRECTION-FINDING ANTENNAS ABOVE THE EARTH'S SURFACE Russian patent published in 2020 - IPC G01S3/00 

FIELD: radar ranging and radio navigation.

SUBSTANCE: invention relates to radio engineering, particularly to radio direction-finding, and can be used to locate elevated radiating objects from aircraft board or aircraft positioning over radio beacon with known coordinates. Method for positioning above earth surface of emitter or direction-finding antennas includes receiving signals of emitter by means of direction-finding antennae, which form annular antenna array located parallel to earth surface, and additional antennas installed on the normal to the plane of the grid from its center, determining, based on the antennas received by the array, azimuth signals of the emitter, measurement of complex amplitudes of received signals and conversion of measurements in direction of obtained azimuth into three-dimensional spatial spectrum by azimuth, distance to emitter and height of lifting, wherein spatial spectrum is obtained by multiplying each measurement by complex conjugate beam pattern of corresponding antenna, summation of multiplication results, determining the square of the modulus of the sum and normalizing it to the sum of squares of moduli of the beam patterns of the antennae, which are determined from the set of the direct and reflected from the earth's surface wave, taking into account their amplitudes and phases, based on the mutual position of the radiator and direction-finding antennas, the reflection coefficient from the earth's surface and frequency, on which complex amplitudes are measured, measurement of complex amplitudes and conversion of measurements into spatial spectrum is carried out simultaneously on a plurality of frequencies in the radiation band, obtained spatial spectra are summed, and the distance to the emitter and the height of its elevation at a certain height of the direction-finding antennas or the height of the ascent of the direction-finding antennae at a certain elevation of the radiator is determined from the position of the maximum of the total spatial spectrum, which is obtained respectively from the height of the rise of the radiator or direction-finding antennae.

EFFECT: high accuracy of determining height of lifting and range to emitter in 5–10 times and determination of lifting height of direction-finding antennas at known elevation of emitter.

1 cl, 3 dwg