METHOD FOR DIGITAL GENERATION OF ANTENNA PATTERN OF AN ACTIVE PHASED ANTENNA ARRAY WHEN EMITTING AND RECEIVING LINEAR FREQUENCY-MODULATED SIGNALS Russian patent published in 2022 - IPC H01Q21/00 G01S13/26 

FIELD: radio engineering.

SUBSTANCE: area of application: the invention relates to the field of radio engineering and can be used in radio location stations (radars) with active phased antenna arrays (APAA) during digital formation of antenna patterns (AP). Substance: in the transmission mode of the APAA, a digital LPM signal is formed, the digital signal is distributed over the transciever modules (TM) of the APAA, in each m^th TM, the broad spectrum of the sounding LPM signal is divided into I narrowband spectral regions where the width of the spectrum satisfies the condition of band narrowness c is the speed of light, is the linear aperture size of the APAA in the electronic scanning plane of AP), the complex envelope of each i^th narrowband signal is isolated at the input of each m^th TM where is the amplitude, and is the initial phase of oscillations of the i^th narrowband signal, in each m^th TM, the complex envelope of each i^th narrowband signal is multiplied by the complex coefficient where is the phasing constant for each i^th narrowband signal of each m^th TM ensuring signal emission in the direction relative to the normal to the APAA aperture, the complex envelope of each i^th signal of each m^th TM is multiplied by the weighting complex coefficient where is the phasing direction of the APAA relative to the normal to the aperture thereof, compensating for the phasing constant between the electromagnetic waves emitted by each TM in the direction if the condition is satisfied, the complex envelope of the sounding signal is formed at the output of each TM by summing the resulting products, the resulting digital signal is converted to analogue form, amplified and emitted into space by every m^th TM, forming the transmission AP of the APAA by superposition of signals emitted by each TM. In the receiving mode, each broadband signal received by the m^th TM is amplified, converted into digital form, the wide spectrum thereof is divided into I narrowband spectral regions . The complex voltage envelope of each i^th narrowband signal where is the phasing constant obtained by each i^th narrowband signal when an electromagnetic wave with the direction is incident on the emitter of the m^th TM, is multiplied by the complex conjugate coefficient The complex voltage envelope at the output of the m^th TM is determined by summing the resulting products. The antenna pattern of the APAA in the reception mode is formed by summing the resulting complex voltages from the outputs of all TMs.

EFFECT: ensured accuracy of coordinated control of the AP of APAA in the transmission and reception modes, leading to a nearly complete overlap of the main AP lobes in both modes, thereby ensuring the maximum possible signal-to-noise ratio at the input of the receiving apparatus, simplification of the algorithms of the formation of the AP of APAA in the transmission and reception modes, simplification of the technical implementation of said algorithms.

1 cl, 2 dwg