FIELD: physics.
SUBSTANCE: use: in radar stations with active phased antenna arrays (APAA) with digital formation of directional patterns (DP) both for transmission, and to reception when used as probing pulse broadband linear-frequency-modulated (LFM) signals and in wide-angle electronic scanning of the directivity pattern. Essence of the invention lies in the fact that the digital LFM signal is digitally generated, the digital LFM signal is distributed over the APAA receiving/transmitting modules (RTM), in each mth RTM (m = , where M is the number of the RTM), the signal is multiplied by a complex coefficient , where is the required phase shift for each mth RTM when generating a DP in the direction relative to the normal to the antenna aperture, in each mth RTM signal is additionally multiplied by the complex coefficient , correcting distortion of phase distribution of field on antenna aperture caused by deviation of frequency of LFM signal and electronic scanning of the DP, converting the received signal into an analogue form, amplifying and emitting each mth RTM, thereby forming a DP for transmission in accordance with a defined ratio, in the APAA operation mode, received by each mth RTM receiving signal is amplified, digitized, a wide spectrum of the received signal of narrow-band sections I = is separated, where width of the narrow-band spectral region satisfies the criterion << c/La, c is the speed of light, La is the linear size of the antenna aperture in the APAA DP scanning plane, extracting the complex envelope of each i narrow-band signal of each mth RTM , where is the amplitude, and is the phase advance of the ith narrow-band signal at the input of the mth RTM, is the direction of incidence of the electromagnetic wave on the aperture of the APAA relative to the normal to it, multiplying the complex envelope of the ith signal by complex coefficient , where is the required phase shift for each ith narrow-band signal of the mth RTM when receiving the signal from the direction relative to the normal to the APAA aperture, complex envelope of the received signal at the output of each mth RTM is formed by summation of obtained products.
EFFECT: technical result is enabling digital formation of the APAA beam pattern in conditions of wide-angle electronic scanning of the beam pattern when receiving LFM signals when the time of arrival of the signal reflected from the target at the input of the receiver is unknown.
1 cl, 2 dwg
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Authors
Dates
2020-09-22—Published
2020-03-02—Filed