METHOD OF RESOLVING GROUP TARGET Russian patent published in 2013 - IPC G01S13/52 

FIELD: radio engineering, communication.

SUBSTANCE: quadrature components of the complex envelope of a signal received by an antenna are selected; in each quadrature component, the signal is converted to digital form, within intervals (gates) equal to duration of the probing pulse; summation of digital readings is performed; a sequence of N readings is augmented with zeros to a sequence of M readings, where, where M=2ⁿ>N (n is an integer); the obtained M readings undergo amplitude weighing; filter processing is carried out according to an M-point fast Fourier transform (FFT); the modulus of the complex signal envelope at the output of Doppler filters is determined; the number of range gate kmax and the number of the frequency filter jmax, corresponding to the maximum signal amplitude, are determined; an analysis region with a centre (kmax, jmax), made of complex amplitude values of signals in the analysis region is formed; vector Z is multiplied by a pre-calculated inverse matrix of signal mismatch Q^-1; moduli of elements of the resultant vector E are compared with threshold values which are set based on the required spurious solution probability values; the i-th element of the vector E exceeding the threshold indicates a signal from a separate target in a group target with a range which corresponds to the k-th gate and radial velocity which corresponds to the j-th frequency filter.

EFFECT: determining quality, range and Doppler frequencies of separate targets in a group target.

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