SU1522249A1 - Acoustic-optical line for delaying radio signals - Google Patents

Abstract

The invention relates to the processing of radio signals. It can be used in various radio circuits, for example, in time interval meters, in matched filters and correlators for processing discrete signals. The device allows parallel processing of a large number of signals whose frequencies may differ, as well as multi-frequency signals. The aim of the invention is to extend the functionality by providing the possibility of parallel processing of a large number of signals whose frequencies differ from each other, as well as multi-frequency signals while operatively ensuring the change of delay values or parallel reception of a large number of delays. The acousto-optical radio signal delay line allows parallel processing of a large number of radio signals whose frequencies may differ, as well as the processing of multi-frequency signals with on-line variation of the delay values or parallel reception of a large number of different delays. The first 5 and second 7 anamorphic lens systems allow the light distribution to be transferred from the shadow plane of the N-channel acousto-optic modulator 3 to the NMK plane of the elemental photodetector 8, as a result of optical heterodyning in which the corresponding NMK band-pass filters 9 separate signals with different delay values that provides the ability to quickly change the magnitude of the delay, and the parallel receipt of a large number of K different delay values can be ensured during removal of output signal from all K bandpass filters 9 corresponding to the signal of the N-th channel of the modulator 3 and M-th partial diffraction grating 4 located on the shadow surface of the N-th channel of the acousto-optic modulator 3. 1 Il.

Description

low latency can be provided

| when removing the output signal immediately with

.four .

JBcex K bandpass filters 9, corresponding to: the signal of the n-th channel of the module -

torus 3 and the m-th partial diffraction grating 4, located on the shadow of the surface of the n-th channel of the acousto-optic modulator. 3, i Il.

The invention relates to the processing of radio signals, may find application in various radio engineering systems, for example, in time interval meters, consistent filters and correlators for processing discrete signals, and allows parallel processing of a large number of signals whose frequencies can - I like, as well as multi-frequency signals,

The purpose of the invention is to expand the functional capabilities due to the provision of the liver with the possibility of parallel processing of a large number of signals, the frequency of which differs one from the other, as well as multi-frequency signals, while promptly ensuring the change in j delays or parallel to i emitting a large number of delays, the drawing shows a structural

I device diagram.

The device contains sequentially mounted on the same optical axis and optically coupled light source 1, collimating system 2, n-channel acousto-optic modulator 3, nm partial diffraction gratings 4, first anamorphic system of lenses 5, diaphragm 6, second anamorphic system of lin 7 , a PGK element photodetector 8, the electrical output of each element of which is connected with the electrical input of the corresponding, its band-pass filter 9

V. The device can be divided into two modes: parallel processing of a large number of radio signals and processing multi-frequency radio signals,

In the first case, the studied radio signals go to the electric inputs of an n-tap acoustic modulator 3, creating a traveling wave of refractive index with the corresponding frequency in each channel. The light from source 1 passes through the collimating system 2 and illuminates the P.T10SKIM. a beam of n-channel acousto-optic modulator 3. In each channel of the acousto-optic modulator 3, the light diffracts, resulting in the optical output of each channel of the acousto-optic modulator 3 forming two light waves - diffracted (l) and not diffracted (2), Wave (I) leaves the acousto-optic modulator 3 at an angle b determined by the frequency of the signal that is located in the corresponding channel of the acousto-optic modulator 3 (sin0 f / V, where L is the wavelength of light; V is the speed of ultrasound propagation in the sound material a coprostat of an acousto-optic modulator 3; f is the frequency of the radio signal under study),

The optical output of the n-channel acousto-optic modulator 3, in particular on its shadow side, has spar-shaped partial diffraction gratings 4, and the to-gratings in each channel of the acousto-optic signal modulator 3, the frequency of these m partial gratings differ from one another, but all lie in the frequency band of the corresponding n-th channel of the acousto-optic modulator 3,

Both light waves (1) and 52 fall on the corresponding nm-th partial diffraction grating, with wave (2) falling on it normally, and wave

(1) - at an angle Q. Wave (l) passes through the nm-partial diffraction grating without diffraction, and the pole,

(2) it diffracts, and the computed part of it goes out of the nth partial diffraction grating at the same angle & in the case of coincidence of the spatial frequency of the signal in the channel of the acousto-optic modulator 3 and the sp-th partial diffraction grating,

As a result, the light beam diffracted on the nth channel of the acousto-optic modulator 3, and the beam diffracted on the sp-second partial friction lattice, turn out to be collinear 1-1 and S First, anamorphic system of lenses 5 carries out a gradual focusing of the obtained after diffraction on an acousto-optic modulator 3 and partial diffraction gratings 4 of pairwise collinear light beams at points defined by angles of 9 nm for each output of the second partial diffraction grating, in the focusing plane of the first anamorphic Istemi lens 5 located aperture 6j, configured as a matrix of holes, the position of which is determined by

G5

20

vertically along the pacnpo-jQ direction of the n-channel acousto-optic channel

The ultrasound country depends on the modulator of the torus 3 so that the frequencies of all

: on the frequency of the signal being processed, and horizontally they are located at the level of the corresponding partial diffraction grating. Focused pairwise collinear beams pass through the corresponding aperture of diaphragm 6. A second anamorphote system, the niiH3 7, transfers the image of pairwise collinear rays to the nmk-element photodiode 8; nm columns whose elements correspond to nm partial diffraction

gratings, and k - the number of increments of the change in the delay time of the processed rad and signal. On a surface

Each element of the photodetector 8 of the pro-Acustroptic delay line results in optical heterodyning of two collinear beams corresponding to this element. As a result, the output of each element of the photoreceiver 8 generates a signal that hits the corresponding band-pass filter 9. The number of such band-pass filters is also nrnk

The output signal nmk-ro band

filter corresponds to the signal passing through the n-th channel multichannel. acousto-optic modulator 3, the t-th partial grating corresponding to Q signals when operatively providing

 this channel, and is delayed by the time required for changing the delay values or the parallel k-biy discrete variation of the delay time of the radio signal being processed. Remove signals from all k

. aolu.sov; filters 9, corresponding to the nm th column of an element-type photodetector B, can be obtained in parallel k different values of delays for a single signal, the frequency of which corresponds to n-1mu-. the acousto-optic-dd channel of the partial diffraction gratings, of which modulator 3 and the -th partial period of which are determined by the frequency of the diffraction grating corresponding to this channel. Sequential search of the conclusions of these k bandpass filters 9 allows to obtain promptly changing the search delay value of the radio signal being studied,

In the second case, processing of frequency-frequency signals — on all n channels

nm partial diffraction gratings 4 covered the entire frequency range of the processed multi-frequency signal.

The proposed device allows parallel processing of a large number of radio signals, frequency 1, which may be different, as well as processing of multi-frequency signals, providing prompt change in delay values or parallel reception of a large number of different delays.

25 Formula of invention

Duty signals containing an optical 50 connected optical source, collimator system, acousto-optic light modulator, diffraction grating, diaphragm, photodetector, and bandpass filter located on the same optical axis, in order to extend the functionality by the possibility of parallel processing of a large number of signals whose frequencies differ from one another and also multi-frequencies35

By obtaining a large number of delays, the first anamorphic lens system installed behind the diffraction grating is inserted into it, the second lens system is anamorphic, the second is the diaphragm mounted lens, the acousto-optic modulator is n-channel, the diffraction grating consists of nm

55

the processed signals, and w is the number of frequency channels in each channel of the acousto-optic modulator, the diaphragm contains nm holes vertically along the direction of ultrasound propagation depending on the frequency of the signal being processed, and horizontally

The n-channel acousto-optic modulator 3 is supplied with the same processed multi-frequency radio signal. Its processing using nm partial diffraction gratings 4 is performed in the same way as in the first case, but the frequencies of the partial diffraction gratings must change from a canap to

nm partial diffraction gratings 4 covered the entire frequency range of the processed multi-frequency signal.

The proposed device allows parallel processing of a large number of radio signals, frequency 1, which may be different, as well as processing of multi-frequency signals, providing prompt change in delay values or parallel reception of a large number of different delays.

25 Formula of invention

 Q signals with operational support

Duty signals containing an optical 50 connected optical source, collimator system, acousto-optic light modulator, diffraction grating, diaphragm, photodetector, and bandpass filter located on the same optical axis, in order to extend the functionality by the possibility of parallel processing of a large number of signals whose frequencies differ from one another and also multi-frequencies35

changes in delay or parallel values

partial diffraction gratings, the period of which is determined by the frequency reception of a large number of delays, the first anamorphic lens system installed behind the diffraction grating, the second anamorphic lens system installed along the aperture, and the acousto-optic modulator is n-channel the diffraction grating consists of nm

the processed signals, and w is the number of frequency channels in each channel of the acousto-optic modulator, the diaphragm contains nm holes vertically along the direction of ultrasound propagation depending on the frequency of the signal being processed, and horizontally

71522249 8

yJiOBHe corresponding to the partial nm partial diffraction grating of the diffraction grating, photodetectors, k is the number of discrete changes

made of nmk elements, and nm time delay processed rastolbtsov Ago elements correspond to the signal.

Claims (1)

Claim An acoustropic radio signal delay line containing optically jg coupled light sources located on the same optical axis, a collimating system, an acousto-optic light modulator, diffraction grating, aperture, photodetector and band-pass filter, characterized in that, in order to expand the functionality by providing - the filter corresponds to the signal passing through the ή-th channel of the multichannel acousto-optic modulator 3, the t-th partial lattice corresponding to dd to this channel, and is delayed by emya corresponding to the k-th discrete delay changes processed RF signal, remove all signals to .polosovyh; filters 9, corresponding to the nmth column of the / .nmk-element photodetector 8, can be obtained in parallel to different delay values for a single signal, the frequency of which corresponds to the nth ·· channel of the optic channel with the jg modulator 3 and the πιth partial diffraction grating corresponding to this channel. Sequential enumeration of the findings of these bandpass filters 9 allows one to obtain an operatively changing delay value for studying parallel processing of a large number of signals, the frequencies of which differ from one another, as well as multi-frequency signals while realizing changes in the delay values or receiving a large number of delays in parallel. the first anamorphic lens system installed behind the diffraction grating, the second anamorphic lens system installed after the diaphragm, moreover, acousto-optic The optical modulator is made p-channel, the diffraction grating consists of pt partial diffraction gratings, the period of which is determined by the frequencies of the processed signals, and m is the number of frequency channels in each channel of the acousto-optic modulator, the diaphragm contains pts of holes located vertically along the guided radio signal, In the second case - processing of multi-frequency signals - to all η channels of the signal, and horizontally - to the propagation of ultrasound depending on the frequency of the processing of the corresponding partial diffraction grating, the photodetector is made of n ink elements, and the pt of columns of its elements correspond to pga partial diffraction gratings, k is the number of discrete changes in the delay time of the processed radio signal.