PROCESS DETERMINING STRUCTURE OF COMMUNICATION SYSTEMS Russian patent published in 2000 - IPC

FIELD: radio engineering, passive radio control while solving problem of latent determination of structure of communication system. SUBSTANCE: process is based on use of several stations for detection and direction finding. Signals of all antennas of these stations are recorded in step. Each station coherently receives and registers multifrequency signals from several transmitters for all bases formed by reference antenna and all antennas of stations includes in grid. Time Fourier transform is used to reconstruct complex spectra of signals of each antenna and power spectrum of signal of reference antenna. Comparing it with threshold one chooses frequencies on which complex amplitudes of detected signals are computed. Two-dimensional complex angular spectrum of detected signals is reconstructed by usage of complex amplitudes with the aid of two-dimensional spatial Fourier transform. Azimuthal and elevation bearings are found by modulus of it. Signals of reference antenna of each station are transformed into fluxes of pulse signals X_f,α,β(z) with electron addresses ( frequency f, azimuth α, angle of elevation β ) that describe conditions of radiation and pauses in radiation of each transmitter. Central computer coupled to all stations uses two-dimensional bearings matched in time and frequency and computes positions of transmitters in space, forms by logic multiplication of fluxes X_f,α,β(z) of different stations coincidence fluxes X_f with addresses ( frequency f, coordinates ) and determines radio networks and communication centers of all possible pairs of emitted transmitters by coincidence of fluxes X_f and electron addresses. EFFECT: possibility of latent determination of structure of communication systems. 4 cl, 9 dwg