METHOD OF DETERMINING COORDINATES OF RADIO-FREQUENCY SOURCES Russian patent published in 2013 - IPC G01S5/04 

FIELD: physics.

SUBSTANCE: method involves receiving signals of radio-frequency sources using a group of R≥1 interconnected peripheral and central measuring stations with known location; measuring primary coordinate-information parameters; pre-calculation of the number N=S/So of elementary reference zones, where S and So denote the area of the control and reference zones, respectively; and determining coordinates of centres of the elementary reference zones and assigning each elementary reference zone an index number n=1,2,…N. For the central and R peripheral direction-finding stations, the antenna system of each of which comprises M>2 antenna elements, values of reference primary coordinate-information parameters at the outputs of the A_rm-th antenna element are calculated, where r=1,2,…,R+1; m=1,2,…,M, relative coordinates of the centres of each elementary reference zone. Further, the number of signals at the input of the antenna system is determined. Primary coordinate-information parameters are separately measured for each of the L radio-frequency sources. The primary coordinate-information parameters are directly the phases of signals at the outputs of the A_rm-th antenna element. The measured primary coordinate-information parameters of peripheral direction-finding stations sent to the central direction-finding station. For each n-th elementary reference zone, products of the Hermitean-conjugated vector of reference phases of signals of the r-th receiving station and the vector of the l-th signal of the r-th receiving station, elements of which are phases of the signal at the outputs of the A_rm-th antenna element, are calculated; said products are multiplied by their Hermitean-conjugated values and summed on R+1 receiving stations for each of the L VNV. L maximum sums are selected from the obtained N sums Kn(x,y), and coordinates of the centre of the elementary reference zone, which corresponds to L local maxima of the sums Kn(x,y), are taken as coordinates of the radio-frequency source.

EFFECT: determining coordinates of radio-frequency sources coinciding on the frequency spectrum, which provides high accuracy of position measurement.