METHOD OF MEASUREMENT OF COMPLEX EXCITEMENT AMPLITUDE OF CHANNELS OF PHASED ARRAY

摘要

FIELD: aerial measurement.;SUBSTANCE: method can be used for measurement of directional pattern of phased arrays and detection of damaged channels of phase array when using standard equipment of radar installations which have phased arrays as a part of equipment. Super-high frequency control signal is generated and irradiated by motionless probe at the direction of phased array. Control signal is received by phased array at alternate modulation of signal phase of each channel of phased array and signal is subject to coherent conversion to video frequency followed by selection of quadrature-phase component. Channel is switched to any phase state only once and at any phase state of the channel the analog signal is transformed into digital one K times (value of K varies from 100 to 10000 and higher depending on number of channels). Digital indications are rearranged in such a way that phase of signal of commutated channel in adjacent readings would differ for discrete value of switching of channel's phase. Signal spectrum is calculated. All the spectral components are reduced excluding components of useful signal which number equals to number of phase states of channel. Spectral component corresponding to zero frequency is reduced to zero. Fourier anti-transform is calculated. The sequence calculated has to represent complex excitement amplitudes for any phase state of channel.;EFFECT: improved precision of measurement; reduced time of measurement.;2 dwg, I tbl