SU1332424A1 - Adaptive array - Google Patents

Abstract

The invention relates to radio engineering and provides increased noise immunity when exposed to interference, structurally similar to the useful signal. The adaptive antenna array contains at least two receiving channels, adders 6, 7, 8, mixer 9, local oscillator 10 and synchronization unit 11. Each receiving channel consists of phase splitter 2, multipliers 3.5 and narrowband filters 4. From the received mixture of useful The signal and structurally similar interference of the phase splitter 2 forms the in-phase and quadrature components. After multiplying these components with the error signal coming from adder 6 and filtering in narrow-band filters 4 in multipliers 5, the amplitudes and phases of the signals are corrected, and then summed in adder 7. In the adder 8, the signal generated by the local oscillator 10 and the mixer 9, the quadrature component is suppressed and the in-phase component is separated. 1 il. ULUJ 00 00 th SD

Description

The invention relates to radio engineering and can be used in auxiliary antenna arrays (AAP), designed to protect against interference of various kinds.

The purpose of the invention is to increase the potential of an interference when exposed to an interference structurally similar to a useful signal.

The drawing shows a block diagram of the AAA,

AAP contains at least two receiving channels, each of which contains antennas 1, phase splitters 2, first multipliers 3, narrowband filters 4, second multipliers 5, and also the first 6, second 7 and third 8 adders), mixer 9, local oscillator 10 and a synchronization unit 11.

AAP works as follows.

The received mixture of the useful signal with structurally similar interference from the output of each of the antennas 1 is fed to the phase splitters 2 to form an in-phase and quadrature signal with an initial phase difference of 90. After multiplying in the first multipliers 3, the in-phase and quadrature components with the error signal removed from the first adder 6, and subsequent low-pass filtering using narrow-band filters 4 in the second multiplier 5, the amplitudes and phases of the signals are corrected (their complex weighting), and then summed A second adder 7 is output. From the output of this adder, a signal is fed to a third adder 8, the output of which produces only the in-phase component of the sum signal and the quadrature is suppressed. To do this, the frequency of the local oscillator 10, synchronized by the block 11 syn

time is chosen equal to twice the first input of the third adder, and

frequency of received signals. In mixer 9, the frequency of the received signal is subtracted from the frequency of the local oscillator 10, as a result of which the frequencies of the signals at the outputs of the mixer 9 and

Compiled by N. Andreev

the output is connected to the second input of the third adder, the output of which is connected to the first input of the first adder and is the output of an adaptive antenna array.

Editor I.Nikolaychuk Tehred M.Didyk

Order 3842/50 Circulation 625 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

The second adder / turns out to be equal, and the phases have the opposite sign. This minimizes the mean square error of the common-mode component of the sum signal.

Risch in noise immunity compared with the known device when exposed to interference, structurally similar to the useful signal.

Claims (1)

Invention Formula An adaptive antenna array containing at least two receiving channels, each of which consists of an antenna, to the output of which is connected a phase splitter, the outputs of which are the inputs of the in-phase and quadrature channels, each of which includes a series-connected first multiplier, narrowband filter and a second multiplier, The second input of which is connected to the first input of the first multiplier, the second input of the first multiplier is connected to the output of the first adder, the second input of which is the input of the reference signal, while the outputs of all in-phase and quadrature channels are connected to the inputs of the second adder, characterized in that, in order to increase noise immunity when exposed to interference, structurally similar to the useful signal, a mixer, a third adder, a local oscillator, a synchronization unit, whose input connected to the second input of the first adder, and the output to the control input of the local oscillator, the output of which is connected to the second input of the mixer, the first input of which is connected to the output of the second adder and the output is connected to the second input of the third adder, the output of which is connected to the first input of the first adder and is the output of an adaptive antenna array. Proofreader S. Shekmar