METHOD OF ACTIVE REVIEW SINGLE-PULSE RADIOLOCATION WITH AN INVERSE SYNTHESIS OF ANTENNA APERTURE Russian patent published in 2019 - IPC G01S13/44 

FIELD: radio engineering and communications.

SUBSTANCE: invention relates to the field of radio engineering and can be used in terrestrial surveillance radar and radio vision systems. Digital antenna array or analog antenna array with digital signal processing and a rectangular aperture are used, whose radiation patterns form in space a single-pulse group of rays (SGR), break a given area of the space review into areas, carry out a discrete overview and detect the entire set of objects being located (LO), they measure and memorize the motion parameters of the LO, recalculate their angular coordinates (AC) in the AC on the plane of the inclined ranges, and calculate the values of the inclined course angles of the LO at the points A_e, set the coordinates of the center of the synthesis of the antenna aperture on an inclined plane and determine the coordinates of the center of the interval of synthesis in the coordinates of the "azimuth and elevation", calculate the maximum increment of the Doppler shifts of the carrier frequency at the half-power points of the radiation pattern on its opposite slopes, set the repetition frequency of the probe pulses, determine the distance to the object at the boundaries of the interval of synthesis, the length of the interval of synthesis, the time of synthesis and the time interval from the moment t₀ before the start of the synthesis phase, set the value of the desired angular resolution of the radar in angular directions and calculate the number of elements of resolution on the aperture, approximate the function describing the dependence of the slant range on the time the object passes the synthesis interval, three members of the Taylor series, form the samples of the reference function, move the equisignal direction (ESD) of the SGR to a certain position, at a certain time emit during t_C probe pulses with a given repetition rate and receive echo signals from an object or elements of group objects (EGO), select the received signals in range, produce their analog-to-digital conversion, memorize them and form in time t_C trajectory signal (TS), multiply the TS samples and the samples of the reference function, thus demodulating the TS, calculate the point fast Fourier transform of the multiplication result and the modules of its samples, determine the frequency values of the demodulated TS, determine the angles of deviation of the EGO from the ESD, determine the angular coordinates of the EGO and, using these specified values, as well as the measured values of the slant range, velocity and heading angle for the points of location of the LO, they build refined trajectories of the group object and its elements in the area of its piecewise linear approximation.

EFFECT: determining the angular resolution of LO, the resolution of individual elements of group LO, and more accurate determination of their trajectories.

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