SU1385101A1 - Device for shaping plane wave - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to simplify the design. The device contains a microwave signal source 1, a power divider 2, weighing units 3, emitters 4, adaptive processing unit (BAO) 5, memory unit 6, adjustable attenuator 7, reference antenna 8, receiver 9, quadratic envelope detector 10, a smoothing filter 11, a subtraction unit 12, and a DC amplifier 13. The signal of source 1, pass attenuator 7 and divider 2, is evenly distributed over the N channels, then weighted in each of them and radiated. The received antenna signal 8 is transmitted to the receiver 9, and then detected. To form a plane wave of a certain power, the signal from the output of the detector 10 after passing through the filter 11 is compared with a signal of a given power and the difference signal from the output of subtractor 12 is amplified and fed to the control input of the attenuator 7. The goal is achieved by positioning the emitters 4 in the Fresnel zone of the antenna 8, what determines the compactness of the device. Dana il. perform BAO. 5. 2 Il. from 9 (L

Description

from 00

ate

The invention relates to radio and engineering and can be used to measure the characteristics of antenna systems.

The purpose of the invention is to simplify the design.

FIG. Figure 1 shows the structural electrical circuit of the device for forming a flat water; in fig. 2 is a structural electrical circuit of one control channel.

The plane wave shaping device contains a microwave source 1 power divider 2 to N outputs, weighing unit 3, emitters 4, adaptive processing unit 5, memory unit 6, adjustable attenuator 7, control antenna 8, receiver 9, quadratic envelope detector 10, smoothing filter 11, subtraction unit (Ne 12, first DC amplifier 13, low-frequency (LF) generators 14, band-pass filters 15, synchronous detectors 16, low-pass filters of the low-pass filter 17, adders 18, second

dc amplifiers 19.

I

Device shaping flat

waves, works as follows.

The microwave signal source 1, via a controlled attenuator 7, sends a signal to the input of moderator 2 at N outputs, where it is evenly distributed over the N channels, weighted in each of them in the control units 3 and fed to the corresponding emitter 4. Radiated signals A control antenna 8 is adopted, as which any antenna can be used, which has a uniform am-phase-phase distribution, and at the output 1 {by the total, a signal (from the entire aperture) can be obtained, for example, a grating antenna. In this case, the emitters 4 are located in the Fresnel zone of the reference antenna 8, which determines the compactness of the device. The signal received by the reference antenna 8 is fed to the input of the receiver 9. To tune the device to obtain a wide wave in the aperture of the reference antenna 8, the adaptive processing unit 5 generates control signals that are fed to the weighing units 3 and change the complex transmission coefficient of the microwave signal to each of the N channels.

To do this, the weighing unit 3 provides for dividing the microwave signal into the in-phase and quadrature channels, changing the gains in these channels using electronically controlled amplifiers, and summing the signals of the in-phase and quadrature channels.

Generating control signals

the adaptive processing unit 5 is carried out in accordance with the modulation method of searching for an extremum of the quality indicator. To this end, each of the 2N control channels of the adaptive processing unit 5, which contains the low-frequency generator 14, the band-pass filter 15, the synchronous detector 16, the low-pass filter 17, the adder 18 and the second direct current amplifier 19, creates the search oscillation of its frequency using the low-frequency generator 14 which is fed through the adder 18 and the second DC amplifier 19 to the corresponding weighing unit 3. The signal of the reference antenna 8 from the output of the receiver 9, modulated by the amplitude of the search oscillations, is fed to the quadratic envelope detector 10, the amplitude the output of which is proportional to the power incident on the reference antenna 8 of the electromagnetic wave.

The variation of this power with the search fluctuations of the corresponding -frequency from the output of the quadratic envelope detector 10 is allocated in each control channel of the adaptive processing unit 3 by a band-pass filter 15 and fed to the input of the synchronous detector 16, to the second input of which the search oscillation of the corresponding low-frequency generator 14 is fed. the signal of the synchronous detector 16 is supplied to the low-pass filter 17, which will allocate a constant component of this signal, forming the required search control signal. This search control signal is added in the adder 18 with the search oscillation to obtain a control signal which, after amplification by the second DC amplifier 19, is fed to the corresponding weighing unit 3. The weighing units 3 are controlled until a flat front is formed At the input of the reference antenna 8 and at the output of the quadratic envelope detector 10, there will be no signal modulated by search oscillations with frequencies.

equal to the frequencies of the low-frequency generators 14, since at the extreme point the power of the output signal of the receiver 9 varies with doubled frequencies of the search oscillations.

To form a plane wave of a certain power, the signal from the output of the quadratic envelope detector 10 after passing the smoothing filter 11 is compared in subtractor 12 with the power specified in memory 6 and the difference signal amplified by the first constant amplifier

current 13 is supplied to the control input j5 from 2N control channels, an adjustable attenuator 7.

each of which consists of a low-frequency (LF) generator, the input of which is the input of the adaptive processing unit and successively

Thus, a plane wave is formed in a device containing

the weighing inputs of the weighing units, which is the fact that, in order to simplify the design, a memory block, an adjustable attenuator connected between the microwave signal sources and a power divider to the N outputs and connected in series to the receiver, quadratic envelope detector, smoothing filter, block the subtractor and the first DC amplifier, the output of which is connected to the control input of the adjustable attenuator, and the adaptive processing unit

Implemented from 2N control channels,

each of which consists of a low-frequency (LF) generator, the input of which is the input of the adaptive processing unit and successively

instead of an antenna array with blocks of a 20-way bandpass filter, synchronization of one control antenna, a detector, a low-frequency filter, .8. simplified design, adder and second amplification of the device. The direct current, the output of which is the corresponding output of the adaptive processing unit, the output of the memory unit is connected to the second input of the subtraction unit, the output of the quadratic envelope detector is connected to the inputs of the adaptive processing unit, the output (LF) of the generator of each channel is connected to the second inputs of the synchronous detector and the adder of the corresponding channel, and the control one. An antenna is connected to the receiver input.

Claims (1)

Claims 25 A plane wave shaping device comprising a reference antenna. well, a microwave source, a power divider for N outputs, each of which is connected in series with a weighing unit and an emitter, an adaptive processing unit, the outputs of which are connected to a control