RU1802348C - Optical-electronic direction finder - Google Patents

Abstract

I / acquisition relates to a direction finding technique and can be used to detect and determine target coordinates in the optical range of wavelengths. The aim of the invention is to increase the accuracy of measuring the angular coordinates of the target by determining the position of the target within the radiation pattern of the receiving channel of the infrared radiation. The goal is achieved by introducing into the device a laser, a beam splitter, a unit for generating target coordinates, making the photodetector in the form of an interference filter, a square photodetector and signal processing circuits by introducing into the optical-mechanical scanning device the first and second movable optical wedges, fur an optical modulator, optically coupled to a radiating photodiode and a photoresistor, reflecting mirrors. The focusing mirror is made stationary with a hole along the optical axis. 5 ill. ate with

Description

The invention relates to optoelectronic direction finding devices and can be used in devices for detecting target coordinates in the optical wavelength range.

The aim of the invention is to increase the accuracy and measure the angular coordinates of the target by determining the position of the target within the direction of the radiation pattern of the infrared receiving channel. :

In FIG. 1 shows a functional diagram | optoelectronic direction finder; in FIG. 2: - functional diagram of an optical-mechanical scanning device; in FIG. 3 is a functional diagram of a photodetector; in FIG. 4 is a functional block diagram of the formation of target coordinates; in FIG. 5 is an external view of a first optical wedge with a mechanical modulator, where

 indicated: 1-photodetector; 2

- optical-mechanical scanning device; 3-engine; 4 - the first gear; 5 - the second gear; 6 is a first reference voltage generator; 7 is a second reference voltage generator; 8 - focusing mirror; 9 - sweep generator; 10 - electron beam indicator; 11 - laser; 12 - a beam splitter; 13 is a block for generating target coordinates; 14 - the first movable optical wedge; 15 - the second movable optical wedge; 16 - mechanical modulator; 17 - emitting photodiode; 18 - photoresistor; 19 - a reflecting mirror; 20 - four-quadrant photodetector; 21

- interference filter; 22 - clock generator; 23 - the first amplifier; 24 - the second amplifier; 25 - the third amplifier; 26 - the fourth amplifier; 27 - the first analog-to-digital Converter (ADC);

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about

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28 - second ADC; 29 - the third ADC; 30 - fourth ADC; 31 - the first register; 32 - second register; 33 - third register; 34 - the fourth register; 35 - fifth register; 36 - sixth register; 37 - the first subtractor; 38

- second subtractor; 39 - third subtractor; 40 - the first adder; 41 - second adder; 42 - the third adder; 43 - the fourth adder; 44 - fifth adder; 45

-first digital-to-analog converter (DAC); 46 - second DAC; 47 - the first divider; 48 - the second divider; 49 is a code comparison scheme; 501 - shaper initial code; 51 is a differentiating circuit; 52 - the sixth adder; 53 - seventh adder; 54 is a first match diagram; 55

-second coincidence scheme.

Optoelectronic direction finder operates as follows.

The continuous radiation of the laser 11 passes sequentially through the beam splitter 12, the first optical input-output of the optical-mechanical scanning device 2, the reflective mirror 19, the focusing mirror 8, the second 15 and the first 14 optical movable wedges and through the second optical input-output of the optical-mechanical scanning device 2 is transmitted to space.

The identical first 14 and second 15 optical movable wedges rotate in the same direction with frequencies wi and w z, respectively, and create a rosette path of the laser beam. Since the wedges are asymmetrical about the axis of rotation, they must be mechanically balanced by a specially selected frame. The first 14 and second 15 optical wedges through the first 4 and second 5 gearboxes are mechanically connected to the first b and second 7 reference voltage generators, which are sine-cosine potentiometers generating voltage UsjnotitM Ucos am, Usin (Oiiw Ucos These voltages are supplied through the first and second outputs of the optical-mechanical scanning device 2 to the first and second inputs of the scan generator unit 9, where they are added and fed to the fourth and fifth inputs of the target coordinate generation unit 13 in the form of;

ihl w U (cos "011 + cos w 2t)

 U (sln + slri) (1) where UHL. Uyn are the x coordinates of the axis of the laser beam.

On the first optical wedge 14, a mechanical modulator is rigidly fixed, which is an opaque disk with slits cut into it (Fig. 5).

Continuous radiation of the LED 17, passing through the modulating slots of the rotating mechanical modulator 16, enters the photoresistor 18, from the output of which the pulse voltage passes through the third output of the optomechanical scanning device 2 to the electrical input of the photodetector 1.

If there is a target in the scanning area, the laser radiation reflected from it in the form of a pulse (since the laser beam slid along the target) through the second optical input and output of the optical-mechanical scanning device 2, the first and 14 and second 15 optical movable wedges, the focusing mirror 8, a reflecting mirror 19, a beam splitter 12, an interference filter 21 of the photodetector 1, is incident on a four-quadrant photodetector, at the first, second, third and fourth outputs of which voltage pulses are generated, amplified by the first 23, second 24, third 25 and fourth 26 amplifiers and supplied to the first inputs of the first 27, second 28, third 29 and fourth 30 analog-to-digital converters, the second inputs of which are supplied by the pulse voltage from the output of the clock generator 22. Clock frequency generator 22 is selected to provide multiple time quantization of the pulse from the target. From the outputs of the first 27, second 28, third 29 and fourth 30 analog-to-digital converters, signals in the form of a binary code are fed to the inputs of, respectively, the first 31, second 32, third 33 and fourth 34 registers, in which are stored if there are second inputs on them pulse from the clock generator 22 and at their third inputs of the gating pulse supplied to the electrical input of the photodetector 1 from the third output of the optical-mechanical scanning device 2. -Signals from the outputs of the first 31 and second 32 registers are received and the first inputs of the first 37 and second 38 subtractors and to the first inputs of the first 40 and second 41 adders, and from the outputs of the third 33 and fourth 31 registers to the second inputs of the first 37 and second 38 subtractors and to the second inputs of the first 41 and second 41 adders, At the outputs of the first 37 and second 38 subtracting devices, signals Aui (ui-of) and Di (U2-U4), respectively, are formed, and at the outputs of the first 40 and second 41 adders, signals and 1 (u2 + U3J and and 2 (ui + U4) where. - ui, U2. of, U4 - signals from the outputs, respectively, of jriepeoro 31, second 32, third 33 and four

5

0

5

0

5

0

5

0

5

ioro 34 registers. The signals from the outputs of the first 37 and second 38 subtracting devices are supplied, respectively, to the first and second inputs of the third 39 subtracting device, the output of which generates a signal proportional to y, the coordinate g of adding the target image on the surface of the quadrant photodetector 20: j Uyy ( Di1-Di2);

 Uyy (U1 + U4 (U2 + U3) (2)

At the same time, the signals from the outputs of the first 37 and second 38 subtracting devices are received, respectively, at the first and second inputs of the third 42 adders, on the input of which a signal is generated proportional to x - the coordinate of the position of the target image on the surface of the quadrant photodetector 20: j ihu (Aut + D U2):

j Uxy (U1 + U2) - (U3 + U4). (3)

I The signals from the outputs of the first and second 41 adders are supplied, respectively, to the first and second inputs of the fourth 43 adder |, the output signal of which is the sum of the signals w and 1 + and 2 + from + and / |. The total signal and is fed to the first inputs of the first 47 and second 48 delitel, the second inputs of which are fed, respectively, signals (2) their and (Zriuts. Normalized to the magnitude and output signals of the first 47 and second 48 add-ons, which are binary codes and carriers of Cartesian information (yhun coordinates, position of the center of gravity of the target image on the surface of a quadrant photodetector 20, are converted into analog signals by the first 45 and second 40 digital-to-analog converters and through the first and second the first outputs of the photodetector-Ki device 1, the first and second inputs of the b / ock 13 forming the coordinates of the target n are given, respectively, to the first inputs of the sixth 52 and seventh 52 adders, to the second inputs of which the voltages (1) and Chl, Pool. of the sixth 52 and seventh 53 adders are removed by voltages which, through the first and second outputs of the target coordinate generation unit 13, go to the first and second inputs of the sweep of the electron beam indicator 10. Under the influence of these voltages, the indicator beam follows the movement of the laser beam in picture plane speed goals.

i The fifth 35th and sixth 36th registers, the fifth 44J adder, code comparison device 49, initial code generator 50, and differentiator circuit 51 are

a digital detector of the signal from the target, which operates as follows. In the initial state, zeros are recorded in the fifth and sixth 36th registers. If there is 5 a signal from the target to the first group of inputs of the fifth adder 44, a non-zero code is supplied from the output of the fourth adder 43, which is added to the code recorded in the sixth 36th register and the result of addition is overwritten in the sixth 36th register. Moreover, the sixth 36 register, firstly, operates when there is a gating pulse at its installation input, and secondly, it overwrites

5 information upon receipt of a pulse at its synchronizing input from the output of the following: oscillator 22. Upon completion of the operation of the strobe pulse, register: 36 is reset. So fifth 44

0 adder and sixth register 36 perform the operation of integrating the pulse from the target during the operation of the strobe pulse.

In the fifth 35 register, the contents of the fifth adder 44 (integration result) are recorded on the trailing edge of the gating pulse supplied to its synchronizing input from the photodetector electric input

0 of device 1. The code recorded in paragraph 35 of the register is compared in the device 49 for comparing codes with a threshold code generated in the initial code generator 50. If the numerical value of the code

5 on the first group of inputs of the code comparison device 49 is less than the numerical value of the code on its second group of inputs, then the code comparison device 49 generates zero voltage, otherwise 0 is a constant voltage other than zero. If a pulse is received from the target, then a detection pulse is generated at the output of the differentiating circuit 51, which resets the fifth 35 register. Besides,.

5, the generated detection pulse through the third output of the photodetector 1 is fed to the third input of the target coordinate generating unit 13 and to the third backlight input of the electron beam indicator 10.

At the moment of arrival of the detection pulse to the third backlight input of the electron beam indicator 10 at the inputs of the sixth 52 and seventh 52 adders of the block

5 13 the formation of the coordinates of the target there are generally nonzero analog signals, their signals, which are added to the signals (1) of their signals, signals and specify the beam position of the electron beam indicator 10. As a result, the angular

the coordinates of the target in the field of view are determined in the Cartesian coordinate system by the position of the luminous point.

The detection pulse generated in the photodetector 1 from its third output through the third input of the target coordinate generating unit 13 opens the first 54 and second 55 matching schemes, entering their first inputs, thereby passing signals through the third and fourth outputs of the target coordinate generating unit 13 carrying information about the exact angular coordinates of the target, to external consumers of such information.

The use of the invention improves the accuracy of determining the angular coordinates of the target in an electro-optical direction finder.

Claims (1)

SUMMARY OF THE INVENTION An optical-electronic direction finder comprising an optical-mechanical scanning device including a focusing mirror, first and second voltage generators, first and second gears, and a motor connected mechanically through the first and second gears to the first and second voltage generators accordingly, the scan generator unit, the photodetector and the cathode ray indicator, the first and second outputs of the optical-mechanical scanning device are connected to the first and second inputs of the scan generator block, the third output of the optomechanical scanning device is coupled to the input of the photodetector, the first output of which is connected to the first input of the electron beam indicator, characterized in that, in order to increase the accuracy of measuring the angular coordinates of the target by determining the position targets within the radiation pattern of the receiving channel of the infrared radiation, a laser and a beam splitter, as well as a unit for generating the coordinates of the target are introduced, while the photodetector contains It contains sequentially mounted and optically coupled interference filter and a quadrant photodetector, as well as a clock generator, a first amplifier, a first analog-to-digital converter, a first register, a first subtractor, a third subtractor, a first divider and a first digital-to-analog converter, connected in series second amplifier, second analog-to-digital converter, second register, second subtractor, third adder, second divider, second digital-to-analog converter, series-connected third amplifier, third analog-to-digital converter, third register, first adder, fourth adder, fifth adder, fifth register, code comparison circuit, differentiator circuit, fourth amplifier, fourth analog-to-digital connected in series 0 converter, fourth register, second adder, and sixth register, the output of which is connected to the second input of the fifth adder, the output of which is connected to the first input of the sixth register, output 5 clock generator connected to the second inputs of the first, second, third and fourth analog-to-digital converters, the second inputs of the first, second, third, fourth and sixth registers, 0 the output of the second register is connected to the second input of the first adder, the output of the third register is connected to the second input of the first subtracter, the output of the fourth register is connected to the second input of the second subtractor, 5, the output of the first register is connected to the second input of the second adder, the output of which is connected to the second input of the fourth adder, the output of which is connected to the second inputs of the first and second dividers, the output of the first subtractor is connected to the second input of the third adder, the output of the second subtractor is connected to the second input of the third subtractor. the output of the initial shaper is connected to the second input 5 of the code comparison circuit, the output of the differentiating circuit is connected to the second input of the fifth register, the outputs of the first, second, third, and fourth platforms of the quadrant photodetector are connected to the inputs 0 of the first, second, third, and fourth amplifiers, respectively, the target coordinate generation unit comprises a sequentially connected sixth adder and a first coincidence circuit, sequentially connected a seventh adder and a second coincidence circuit, optically conjugated first and second movable optical devices are introduced into the optical-mechanical scanning device wedges located asymmetrically with respect to the axis of rotation, mechanically connected to the first and second gears, respectively, a mechanical modulator, rigidly fixed on the first optical movable 5 wedge emitting a photodiode, optically coupled through a mechanical modulator with a photoresistor and a reflective mirror, optically coupled to a focusing mirror, which is made stationary with the hole on the optical axis, while the laser is optically coupled through a beam splitter with a reflective mirror, the output of the photoresistor of the optical-mechanical scanning device is connected to the third inputs of the first, second, third, fourth, fifth and sixth registers of the photodetector, the output of the first digital-to-analog converter of the photodetector is connected with the first input of the sixth adder of the target coordinate generation unit, the output of the second-pojro digital-to-analog converter of the photodetector is connected to the first input of the seventh sum fortor block the world of the target coordinates, the output of the differentiating circuit of the photodetector is connected to the second inputs of the first and second matching schemes of the target coordinate generation unit, the outputs of the sixth and seventh adders of the target coordinate generation unit are connected to the second and third inputs of the electron beam indicator, respectively, the second inputs of the sixth and seventh adders the target coordinate generation unit are connected to the first and second outputs of the scan generator unit, respectively. Fig 4