METHOD OF BEAM FORMATION IN APERTURE DIGITAL ANTENNA ARRAY Russian patent published in 2022 - IPC H01Q3/34 G01S3/38 

FIELD: physics.

SUBSTANCE: invention relates to antenna engineering and specifically to methods of beam formation of receiving digital antenna arrays (AA) for communication and radar systems. Summary: in the method of generating a multibeam pattern, the received complex signal from each of the M AA modules is divided into two quadrature components which form M pairs of signals. Using ADC, quadrature components are digitized and time sequences are formed from them. For the formation of the beam pattern in each receiving module using the device for digital formation of the beam pattern in each receiving module and under the control of the device for generating coefficients for forming the beam pattern in the receiving module corresponding digital signals are mixed into corresponding quadrature pairs. Each pair of quadrature components is multiplied into N groups according to the number of beams and combined according to the attribute of belonging to the beam pattern of separate beams. To form a multi-beam antenna array pattern using a device for digital formation of a multi-beam pattern antenna array and under control of a device for generating coefficients for forming a multi-beam pattern antenna array corresponding digital signals are added to the corresponding quadrature pairs of each group according to the number of beams. Each quadrature component of each channel, obtained after digitization, is additionally refined in accordance with the expressions:

,

where I₀, Q₀ are specified in-phase and out-of-phase quadrature components at the current moment of time; is digitized in-phase and out-of-phase quadrature components of time sequence at corresponding moments of time; L is the sliding window duration, which is a multiple of the signal carrier period and the sampling period; 2l is a moment in time within the sliding window duration.

EFFECT: lowering the level of side lobes of the multibeam beam pattern (BP).

1 cl, 1 tbl, 5 dwg