SU1635240A1 - Planar radio-optical array - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to improve the accuracy of determining the two-dimensional coordinate information. Antenna array emitters 1 receive signals that, after coherent effort, arrive at a three-dimensional acousto-optic modulator (AOM) 3 of the light, rotated at angles a And / and installed in the path of collimated light in front of the 5 VOM 3 collecting lens, excite ultrasound waves acoustic wires 4 and thus a collimated beam of light translucent to AOM 3. Due to the special orientation of AOM 3 at angles a and / to axes X and Y, the optical signal formed directly behind AOM 3 has t special format. The goal is achieved by ensuring an unambiguous correspondence between the angular coordinates of the object and the coordinates of its focused image 2 or about with SP N3 O

Description

The invention relates to radio engineering and can be used in radar systems.

The purpose of the invention is to improve the accuracy of determining the two-dimensional coordinate information.

FIG. 1 shows a block diagram of a planar radio-optical grid; FIG. 2 - optical signal input format

The plenary radio optical array contains an antenna array (AP) of NxM emitters 1, coherent amplifiers 2, an NxM channel acousto-optic light modulator (AOM) 3, made in three dimensions, in the form of N plane-parallel M-channel plates aligned with their flat edges, sump 4, collecting lens 5

The planar radio-optical grid operates as follows.

The elements of an NxM antenna array, through coherent amplifiers 2, are connected to a geometrically similar structure of AOM 3 piezoelectric transducers with dimensions AXAYAZn and distance b X between channels. The AOM 3 is rotated at an angle a arcsin (5Х / Dg) and 0 / «arctg (Ay / Az) in the XOZ and YOZ planes, respectively. The AOM 3 is set in the path of the collimated light E0 in front of the collecting lens 5, the back focal plane () of which is the output (+ - lens focal length 5). Due to the turn of the AOM 3, the optical signal read from the AOM has the input format shown in FIG. 2 In an oblique XY coordinate system, this format has a standard two-dimensional structure with independent variables X and Y. The angle y between the axes X and Y is equal to

in arctg (sin / 9 / sin a)

Signals received by NxM radiators 1 are coherently amplified (L transform, if necessary, to an intermediate frequency) by amplifiers 2 As a result, each NMR input of the AOM 3 is excited by a signal with a complex amplitude Umn KVgexp iKslnQg (Xmcos -I - Yn sin),

(one)

where K is the gain of the amplifiers 2, Vg is the amplitude of the signals at the outputs of elements 1 from a point source d,

Xm-Up coordinates of nm-ro element Signals 1 excite ultrasound waves in the corresponding channels of the AOM 3 that modulate the optical density of its sound ducts 4 and thus the collimated light beam Еo, which translucent AOM 3. Thanks to the special orientation of the AOM 3 at angles a and k The X and Y optical signal, which is formed directly behind the AOM 3, has a special format, such as that shown in Fig. 2. Here, the nm signal (1) is spatially deployed in the TM duct, which is displayed in the form of a main square band, located in the nth g uppe M bands of overall width dX Due selected corners "and / strip does not sag to one another, ie there is a one correspondence between elements of the AR 1 and the said strips, this correspondence can be displayed in matrix form

Xmi rrfl ()

YnJ 1GTTTsUp) w

G L11

where m

matrix trans x x O

O m y

kTeordinates, with mxx dV / dx the addressing scale of the AP along the measurement axis X and myy dV / dy - the same scale along the Y axis On the other hand,

Yny

I J ri Ch V.

V: j

P)

r IL 1 -ctg at 1 where m J 0 s | n j, r-angle, defined by the formula (1)

Therefore, obedin (3) and (4), we will have

$ :) (:) “

Where

IA ft p tn tlhh mx / xct9 /

1 J l J L J0 my y / sm y.

The addressing law of the form (4) leads to the fact that as a result of the signals (1) using a collecting spherical lens 5 in its rear focal plane Wx rvfy a light spot is formed with the coordinates

("I D 1 (K Sin Qg cos / V

f VJ l J K sin Qg smyjg where Wx t x / f f, y / f

Thus, as can be seen from (5), an unambiguous correspondence free from uncertainty is established between the angular coordinates Qg, / Ed of object g and the coordinates and its focused image. This circumstance improves the accuracy of determining two-dimensional coordinate information and simplifies the design of the device. in the output plane of the process

Claims (1)

Invention Formula The planar radio optical array contains an antenna array consisting of (five) from NxM emitters connected via coherent amplifiers to the inputs of an NxM-channel acousto-optic light modulator, optically coupled to a collecting lens located along the longitudinal axis, the back focal plane of which is output the accuracy of determining the two-dimensional coordinate information, the NxM-channel acousto-optic light modulator is made three-dimensional in the form of N plane-parallel M-channel plates, aligned with flat edges, whose sound ducts are geometrically similar; radiator, the angle between R 5 10 5 the longitudinal axis of the collecting lens and its projection on the plane in which the inputs of the NxM-channel acousto-optic light modulator are located, lies within 0 / arctg (AY / AZ), and the angle between the longitudinal axis of the collecting lens and its projection on the plane facing the front plane of the collecting lens is chosen equal to a arcsin (5XMZ), where d x is the distance between the inputs of an NxM channel acousto-optic light modulator: AZ is its thickness; D Y - the length of its sound pipes. Phie. I