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Invention can be used in systems for detecting optical and optoelectronic surveillance equipment in natural conditions and identification thereof. The method comprises, before probing, receiving natural background radiation signals by measuring radiation spectral distribution and determining therein the ratio between intensities of spectral components at three selected wavelengths; generating laser radiation beams at said wavelengths with beam intensity ratio matching the spectral component intensity ratio in the received background radiation; generating a resultant laser radiation beam and performing probing and receiving reflected laser radiation at the three wavelengths and in a wide spectral band; measuring the strength of the received optical signals and determining retroreflection factors for the three wavelengths and for a wide wavelength band; based on said values, forming a spectral portrait of the retroreflection factor, from which optical and optoelectronic surveillance equipment is detected and identified. |
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Method of determining direction of optical radiation source using vehicles Invention relates to optical electronics and can be used in precision systems for establishing communication, in systems for precision guidance of narrow optical beams, trajectory measurement systems, as well as systems for providing stability of an optical data channel, mounted on vehicles. The method of determining the direction of an optical radiation source using vehicles involves: mounting two electro-optical coordinators (EOC) on vehicles (cars, armoured vehicle etc), wherein the position of the EOC is stabilised in the vertical and horizontal planes i order to maintain orthogonal orientation of receiving fields of the EOC in the coordinate system; using a navigation system to determine current coordinates of the EOC and coordinates of photocells of matrix receivers relative thereto; receiving radiation of the source scattered by an aerosol formation and calculating angular coordinates of the source from the current coordinates of the photocells a having maximum value of output signals. |
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Apparatus for imaging microwave electric fields in space Apparatus for imaging microwave fields employs an "open" type measuring chamber consisting of two horizontally arranged parallel copper discs, a probe antenna moved by two stepper motors controlled by a computer program, both on an arc of a circle and on the radius thereof, a reference channel connected in parallel to a measuring channel by two microwave power dividers. |
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Method for visual-optical control of atmospheric laser scanning Method involves illuminating the atmosphere with laser radiation, receiving the reflected radiation and using a computing system. Three-dimensional scanning of the atmosphere is carried out using a controlled scanning laser. Flying objects or turbulent currents caused by flying objects deflect beams of a coherent light source in space during thermal turbulent currents with emission of fuel into the atmosphere. Deflection of the beam of the laser light source is controlled by a telemetering device. |
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Stereoscopic method of measuring distance and ship range- and direction-finder Method comprises the following steps: guiding the observation axis onto an object; obtaining images of the object on measurement planes, the measurement planes being orthogonal to the optical axes from the centres of two identical optical devices spaced apart on a known base; taking measurements on the planes through points of projections of the optical axes of the measurement axes of coordinates parallel to the base; measuring positions of boundary points of images of the object from the centres of projections of optical axes; calculating the distance to the object using the size of the base as a component part of the reference parameter, wherein the size of the base and the distance from the centres of optical devices to the measurement planes are controlled. Calculations are carried out using, as a reference parameter, the product of the length of the base and the distance from the centres of optical devices to the measurement planes. |
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Laser location method involves irradiating the determined tangible object with laser radiation whose frequency varies according to a saw-tooth law. The laser radiation is split into three pairs of components and each component is converted from direct to scattered by passing through a diaphragm. All diaphragm pairs are arranged such that they are in one plane and such that optical paths of the laser radiation from the laser to each diaphragm pair are identical. The determined object, on which there is a laser radiation receiver, is successively irradiated with scattered laser radiation from each diaphragm pair. The receiver picks up the resultant signal of laser radiation from each diaphragm pair and converts it to an electrical signal. The electrical signal arising from laser radiation scattered successively from each diaphragm pair in one plane is processed and analysed. Versions of all possible locations of the tangible object in space, which are hyperboloid surface, are determined from the results of analysing and processing signals from each diaphragm pair. The actual position of the tangible object in space is determined from the point of intersection of three hyperbolic surfaces. |
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Method of detecting diffusively reflected or diffusively scattered laser radiation Method involves passing optical radiation which is reflected from a surface or scattered through an optical system. Said radiation is the directed from the output of the optical system to a photoelectric receiver. The photoelectric receiver is outside the focal plane of the optical system. A beam of reflected or scattered optical radiation is scanned relative the photoelectric receiver. The signal from the photoelectric receiver is transmitted to a processing unit and presence of minimum or maximum signals from separate elements of the photoelectric receiver is determined from presence of coherent radiation in the analysed beam. |
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Method involves irradiating the determined object with laser radiation, receiving the laser radiation with a receiver, converting the laser radiation to an electrical signal, processing and analysing the electrical signal and determining the location of the object based on the results. When irradiating a tangible object with laser radiation, the frequency of the laser radiation is varied according to the saw-tooth law. The laser radiation is split into two pairs of components and each component is converted from direct to scattered by passing through a diaphragm. All diaphragms are placed in one plane so that the optical paths of the laser radiation from the laser to each of the pairs of diaphragms are the same. The determined object is irradiated with scattered radiation from each pair of diaphragms successively. A receiver is placed on the determined object and the composite signal of the scattered laser radiation from each pair of diaphragms is received. Said signal is converted to an electrical signal which is then processed and analysed. Two curves of all possible locations of the object on the plane are determined based on the results of analysing the processed signal from each pair. The real location of the object on the plane, which passes through the object and the diaphragm, is determined from the point of intersection of the curves. |
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Perimetre and territory security system Television monitoring system includes at least one remote television camera, having an optical system and a radiation detector. Electromagnetic radiation retroreflectors are placed along the secured zone. The retroreflectors are placed in the field of vision of the television camera such that an intruder moving in the secured zone crosses at least one radiation beam. The beam pattern of the electromagnetic radiation source covers all retroreflectors. The electromagnetic radiation source lies with respect to the television camera such that the condition s<(Dpr+Di)/2+Dr+βR, is satisfied, where s is the distance between optical axes of the television camera and the electromagnetic radiation source, Dpr is the diameter of the entrance pupil of the optical system of the television camera, Di is the diameter of the exit pupil of the optical system of the electromagnetic radiation source, Dr is the clear aperture of retroreflector, β is the angular spread of the beam reflected by the retroreflector in the direction of the axis of the television camera, R is the range to the retroreflector. |
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Coordinate-sensitive photodetector Photodetector has four rectangular photocells lying equidistant from two intersecting coordinate axes. Outputs of two subtractors are the outputs of the coordinate-sensitive photodetector. Inputs of four more subtractors are connected to inputs of photocells lying on one side of each coordinate axis. Photocells lying on the diagonal to the coordinate axes are connected to like inputs of four subtractors. Inputs of the first two subtractors are connected to outputs of subtractors connected to pairs of photocells lying on different sides of the coordinate axes. |
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Device for single-position measurement of direction of electro-optical apparatus Device has the following, connected in series and lying on the path of the received optical radiation: a mixing plate and a photodetector with a shaping optical system. The output of the photodetector is connected to the first input of the signal processing unit of the photodetector, the output of which is the output of the device. The following are connected in series on the path of the reference optical radiation: a heterodyne, a heterodyne signal phase front control unit and a mixing plate. The unit for generating heterodyne signal phase front parameters is connected by its first output to the input of the heterodyne signal phase front control unit, and by the second output to the second input of the photodetector signal processing unit. The optical output of the mixing plate is connected on the heterodyne radiation path to the optical input of a controlled reflecting plate. The third output of the unit for generating heterodyne signal phase front parameters is connected to the input of the reflecting plate control unit, the output of which is connected to the input of the controlled reflecting plate. |
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Method includes the launch of the controlled object, directing of sounding optical path to the reflector, receipt of the optical path from the object, localization of the object and control commands formation; the reflector is mounted on the object and executed in the shape of a triple prism or flat mirror located within the focus of the additionally applied lenses system; the receipt of the optical path is performed by the optical receiver; the object is localized by the reflected sounding optical path; the spatial location of the reflector including its distance from the optical path formation unit and the distance from the optical receiver is defined by application of modeling sounding optical path. |
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Method of identifying object with image frame construction In the method, object search zones are predefined. The image is converted to a set of signals which is a matrix of signals. The signals are discretised and extended signals are picked up. The search zone is first formed using adjoining windows. The centre of each window is the pint on the perimetre of the adjoining window. Boundary points of the determined object are estimated using a luminance difference criterion function. An object of arbitrary shape is constructed between boundary points around the central point, as well as a strobe around that object. Dimensions of the formed object are constrained by dimensions of the strobe on the horizontal and (or) vertical coordinate. |
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Method of measuring angular coordinates of point targets using optoelectronic device In the method, an image of part of space is obtained and then converted by a photodetector array to an array of values of electrical signals containing background signals and target plus background signals. Array components in which the useful signal exceeds a preset threshold are then identified. A background estimation signal is then generated from array components of the values of electrical signals. A target signal is then generated for elements of the target plus background group as the difference between the target plus background signal and the background estimation signal. Angular coordinates of the target are then determined. |
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Method of measuring distance to different points on object surface Sonar is used for range finding. After sonar staff touches measured point, acoustic pulses are generated in turns by two radiators arranged in staff and spaced apart. Said pulses, on reaching acoustic radiation receiver, start processing and determining time interval between acoustic pulse generation and pulse action of receiver mikes. Obtained data are transmitted to computer for it to determine coordinates of measured point. Note here that, for each measured point, distance between radiators is measured with the help of said sonar and, thereafter, sound velocity is corrected for correction to be incorporated with formulas for determining coordinates of said point. |
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Teleorientation laser system having optical feedback channel (versions) Invention relates to instrument making and is meant for creating an information field of teleorientation laser systems. The technical result is provided due to presence of optical feedback in the disclosed device, where the said optical feedback consists of telescopic lens, a phtodetector, a signal decoder and angular error computing device. The signal received from the angular error computing device is used for automatic adjustment of centres of laser rasters when launching the controlled article and for enabling control of parameters of laser rasters in maintenance conditions. |
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Method of searching for and identifying point targets using optoelectronic devices First group of electrical signals (target + background group) is selected such that the corresponding group of elements of a matrix receiver make up a polygon with minimal dimensions, described around the figure of the cross section of the equivalent scattering function of the optical system of the optoelectronic device on energy level γ%. The second group of electrical signals (background group) is selected such that the corresponding group of elements of the matrix receiver makes up a set of an even number 2n of elements. A weight coefficient is pre-selected for each electrical signal of (target + background) and (background) groups. When generating these signals, signals of elements are multiplied by special weight coefficients. |
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In compliance with this invention, known active pulse TV system comprises TV camera CCD, control unit, synchro-generator, and, additionally, CCD gate control pulse shaper and charge image pulse shaper to write image pulses into CCD vertical registers. Note here that said units are connected in between control unit and TV camera, while outputs of line and clock synchro pulses of synchro-generator are connected to additional inputs of control unit. |
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Method of determining position and motion parametres of a supersonic object flying at low altitude over the surface of the sea (SS) from the radar-detected trace of the object on the sea surface does not require radar reflection from the object itself. The method is implemented by detecting the sea surface disturbance, the speed of the front of which enables its classification as a trace of an object flying at low altitude over the sea surface. Detection is carried out using a self-contained radar set mounted on a ship within the radar horizon using multiposition radar detection. The speed of the object is determined from the speed of the front of the sea surface disturbance and the direction of movement of the object is determined from the direction of movement of the front of the sea surface disturbance (SSD). Before detection of the sea surface disturbance, the average slope of large sea surface waves is determined. The average slope of large sea surface waves is determined using the ratio of intensity of electromagnetic energy back-scattering at two angles of slide which are not greater than the average slope of the wavy surface. In order to determine the position and motion parametres of the object, the width of the sea surface disturbance (trace) is measured at a distance from the front of the sea surface disturbance which is greater than L on the entire length of the trace. The width of the trace is measured through radar range strobing. The width of the trace, the distance from the front of the sea surface disturbance to the point where the width of the trace is constant, the flight altitude of the object, the projection on the sea surface of the distance front of the sea surface disturbance to the position of the object is determined using corresponding relationships. |
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Method of selecting moving object Invention relates to passive optical methods of selecting a moving object on a fixed background in an observed scene. The method involves successive recording three images of the monitored space in a sequence of first, second and third time instants and making three contour images from the recorded images. Two differential images are then made by subtracting the first from the second and the first from the third contour image. A selector field is then selected in form of common non-zero areas of the first and second differential images and first and second final images are formed by zeroing areas corresponding to the selector field on the first and second differential images. When the monitored space undergoes such processing, contours of the moving object appear on at least one of the said final images. |
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Device for detecting objects in surrounding space Invention relates to devices for passive optical location, and specifically to apparatus for detecting an optical image and picking out objects of interest on the said image. The device has an even number of optical image detectors (more than two), half of which are fixed on the perimetre of a first platform, and the second half - on the perimetre of a second platform which is vertically shifted from the first platform. The entire assembly of optical image detectors and the apparatus for analysing stereoscopic images are placed in a single protective case. The case houses fans, an electrothermal element and thermal detectors for providing a micro-climate in the internal volume. |
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Method and device for flickering moving point coordinate measurement This invention relates to navigation, particularly to position systems without reflection or secondary radiation and can be used for target designation systems as well as inertial navigation aircraft system updating. The method consists in measuring at three points of time. The measurement is performed at the first and the second points when the flickering point is visible. The images of three conjugate points of the earth surface are registered by means of two optical-location assemblies (OLA). Coordinates of three conjugate points of the earth surface and flickering point being visible for OLA are determined and used for calculation of their coordinated in coordinate system related to the aircraft. The coordinates of flickering visible point are calculated in the coordinate system related to the earth surface at the first and the second points when the flickering point is not visible, coordinates of three conjugate points of earth surface visible for OLA are calculated and used for calculation of invisible point coordinates at the third point subject to the statement on its linear and uniform motion relative to the Earth. The device comprised two diversity OLA and digital counting system. The digital counting system comprises earth surface digital image processing facility, aircraft related coordinate calculation module, earth related coordinate calculation module and flickering point coordinate calculation module. |
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Device for determination of aerospace target motion parametres in actual time scale Invention is related to the field of determination of spatial parametres of flying target motion, for instance in case of training aviation or rocket-space attack, and may be used in development of facilities for detection, registration, seizure and surveillance over flying aerospace targets with nonrecurrent processing of measurement results in actual time scale and automatic tracking of measurement objects from mobile and/or stationary metering posts for provision of possibility for destruction of objects. Device for determination of trajectory flight parametres of target motion in actual time scale includes complex of target flight parametres registration, comprising unit of photo-optical registration of trajectory parametres of target and unit for fixation of dynamic parametres of target by trajectory of observance, which functionally interact with unit of control and digital processing of measurement results, besides, complex of flight parametres registration is installed on rotary-support reference base with the possibility of azimuth-horizontal arc inertia-free motion relative to fixed axis of base reference point during target scanning, besides system of target flight parametres registration is additionally equipped with device of scanning and registration of fighting gear burst, which is functionally connected to unit of photo-optical registration of flight parametres with creation of module of automatic scanning, detection, registration and target tracking system, which is installed with the possibility of continuous-discrete scanning of trajectory parametres of the latter during azimuth-horizontal displacement of created unit of automatic scanning system. |
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Equipment for space observation at background of bright distant light source Equipment for space observation at background of bright distant light source comprises objective with controlled diaphragm and multi-element photodetector, which are installed in body of optical route of image registration, and also device for optical route protection against radiation of bright distant light source. Equipment is provided with external body, on lower foundation of which body of optical route of image registration is fixed. Device of optical route protection installed in cavity of external body consists of light impermeable screen low-sized in respect to objective in the form of disk with diametral through threaded opening and mechanism of light impermeable low-sized screen displacement relative to objective. Besides mechanism for displacement of light impermeable low-sized screen comprises the first and second step electric motors, shaft with thread of the first stepper electric motor interacts with diametral through threaded opening of light impermeable low-sized screen by type of movable joint screw - nut. Parallel to specified shaft, rod is fixed relative to body of the first stepper electric motor for stopping of rotation of light impermeable low-sized screen during its displacement along the shaft. The body itself of the first stepper electric motor is fixed on flat plank arranged with the possibility of rotation on double-coordinate hinge in plane parallel to upper base of external body of apparatus, under action of the second stepper electric motor, body of which and double-coordinate hinge are fixed on upper base of external body. Besides the first and second stepper electric motors are connected to outputs of electronic unit of optical route protection device control, which is connected to signal output of multi-element photodetector unit and control input of objective diaphragm. |
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Method of selecting objects on remote background Method of selecting objects on a remote background involves reception and formation of reference and compared images using two identical video systems, installed at a small distance from each other about a remote background, with parallel principal optical axes, and simultaneous recording of both images. The images are recorded using two identical video systems based on multiple-element high-speed photodetectors, for example, CMOS matrices. Two differential images are formed, the first by subtracting the compared image from the reference image, and the second through subtraction of the reference image from the compared image. Negative values in the differential images are zeroed, after which coordinates of each non-zero fragment on the first differential image are associated with a shift value between the given fragment and the corresponding fragment on the second differential image, until their maximum matching in the direction of background parallactic shift, if there is such a fragment on the second differential image in the given direction. Similarly, coordinates of each non-zero fragment on the second differential image are associated with a shift value between the given fragment and the corresponding fragment on the first differential image. Distance to the detected objects is calculated using the formula R=L·A/Δi, where L is the distance between centres of the objectives of the video systems, and A is the distance from the video matrix to the principal optical axis of the objective of the video system. Δi the value of parallactic shift of the ith image of the object. |
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Method of determining direction of optical sources spread in atmosphere component Present invention relates to the field of quantum electronics and can be used in precision systems providing communication, in systems of precise aiming of thin optical beams, and also in systems for determining the direction on the optical source engineering which is air based. The method is based on receiving the first and second optical-electronic coordinates of the photodetector array, planes of fields which are perpendicular. Coordination affixing of the photo elements of the first optical-electronic coordinator plane x0z and photo elements of the second optical-electronic coordinator is y0z carried out. A third optical-electronic coordinator with a photodetector array, whose field plane is oriented at an angle of 45° to the plane fields of the first and second optical-electronic coordinators. |
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Method of observing space against background of bright distant light source Invention relates to passive optical location. The proposed method comprises forming an actual optical image of space with the help of adjustable-diaphragm lens on the surface of matrix photo recorder of optical radiation. Note here that a small-size screen, its diametre not exceeding that of the lens diaphragm, is placed ahead of optical path lens when the upper limit of photo recorder sensitivity range is oversized on irradiating it with light. |
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Method of processing information in coherent laser locator with photodetector array Present invention relates to measuring techniques and instrument making and can be used in laser Doppler location of stealth objects flying at low altitudes above water basins. The method of processing information in a coherent laser locator with a photodetector array is based on reception of laser radiation from glare of the sea surface, arising when probing radiation is scattered by the stealth object. The current location of an object and its velocity vector can be reconstructed through measurement of angle of arrival of radiation from the glare of the sea surface using a photosensitive reception matrix and through measurement of Doppler frequency shifts in a multi-channel unit for optimum filtration based on heterodyne reception methods using multi-channel dispersive delay lines using statistical averaging methods. Cutting on the number of information processing units is achieved due to creation of two- or three-dimensional groups of elements of a photodetector array, connected to information processing channels. In the processing channel, the signal is converted to a linear-frequency-modulated equivalent with subsequent amplification, spectro-time "compression" in the dispersive delay line, detection and minimum threshold cutting with a given threshold value, which allows for converting a signal with Doppler frequency shift to a short pulse, the time position of which, relative the strobe-pulse for the beginning of the measuring cycle, uniquely characterises the value of the given Doppler frequency shift. This time position of the pulse is coded in a digital code and stored in the corresponding buffer memory of a memory device, in the code of which there is also a code of the number of the measurement cycle and the code of the number of the channel, on which the signal from an element of the photodetector array was processed. From the set of such code records in the given measurement cycle, information is obtained on Doppler frequency shifts in signals of corresponding elements of the array and the position angle on the glare of the sea surface, detected by the locator in the given measuring cycle relative the optical axis of the receiving-transmitting objective of the locator, as well as scatter angles of the probing radiation of the stealth object, generating the said glares. If conditions are met for detecting an object and its bearing auto-tracking, where the inclined range line and the optical axis of the receiving-transmitting objective of the locator lie in the same plane, location of the object and measurement of its radial velocity is done through calculation, using a minimum of two different reflected radiation in a given measurement cycle, based on the method of overlapping circles. The radiation pattern of the locator is fan-shaped - wide on the position angle and extremely narrow on the azimuth. |
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Device for definition of angle coordinates of pulsed laser radiation source Invention is related to instruments for determination of angle coordinates of pulsed laser radiation sources and may be used in protection of different objects against directed aiming. Device comprises control unit, photodetector on the basis of photodiode, two superwide-angle lenses, in focal plane of which two light-sensitive matrices are installed accordingly; time for accumulation of signal of every light-sensitive matrices, on the one hand, is so insignificant, that it provides for absence of day background, and on the other hand, it exceeds time for reset of accumulated signal by second matrix, which provides for continuity of space viewing; control unit connected to the first and second light-sensitive matrices and with photodetector device, provides for alternate accumulation of signal by light-sensitive matrices and determines angle coordinates of pulsed laser radiation source and time of signals appearance at the outlet of photodetector; light-sensitive matrix in mode of signal accumulation at the moment of signal appearance at photodiode outlet, on completion of accumulation mode transferring into mode of signal reading by control unit; at that analysis of time-pulse modulation of signal at the outlet of photodetector may be used for recognition of friend or foe. |
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High efficiency method of object detection is developed. It includes preliminary detection of object search zones, image scanning with the help of scanning window within the limits of the search zones, the size of the scanning window corresponds to the size of an object's image, quantity determination of amplitude intervals N by the square of the scanning window, taking into account the most significant amplitude intervals and choosing the coordinates with maximum value N as the coordinates of the object. The claimed invention increase probability of correct object detection within lower contrasts range of the object and higher contrast range of background. |
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Invention pertains to optical methods of detecting foreign objects on a complex dynamic variable background in a surveillance zone. The technical outcome of the invention is the increased accuracy of detecting objects with simultaneous increase in speed and visibility. The method involves receiving and forming two images on two points spread in space and single registration of each fragment of the reference and compared digital images by two identical viewing systems. Each viewing system is made based on a multi-element high-speed light detector, for example, a CMOS - matrix, and contains an objective. Both viewing systems are fitted at a shorter, compared to the displacement from the presumed location of the object, distance between them, parallel each other and directed at the surveillance area. Analysis of the images is done by determining the displacement value Δ of characteristic fragments of the compared image with the corresponding fragments of the reference image with their maximum possible coincidence in the direction of parallactic shift with subsequent identification of the selected and background objects from the obtained displacements Δ. Based on the obtained displacements Δ, three dimensional images of objects can be formed and the distance to each one of them can be determined. |
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Instrument for daytime and night observation and aiming The instrument has a front-view mirror with a system of stabilization and aiming of the sighting line optically linked with the sight channel, which includes an optical module including the daytime and night channels. The instrument has also a radiator unit, scanning unit, photodetector unit, the output of the photodetector unit is connected to the input of the analog-to-digital converter, whose output is connected to the control electronics unit. |
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In accordance to method, second optical-electronic coordinator with matrix photo-receivers is additionally installed, field flatness of which is perpendicular to field plane of first optical-electronic coordinator, coordinate alignment of photo-elements of first optical-electronic coordinator is performed in coordinate plane x0z and of photo-elements of second optical-electronic coordinator in coordinate plane y0z, determining of angular coordinates of optical radiation source on basis of formulae where ε, β - tilt angle and azimuth of optical radiation source; d - distance between upper and lower lines of photo-elements of optical-electronic coordinator; Δx=x1B-x1H, Δy=y2B-y2H; x1B and x1H - coordinates of upper and lower photo-elements of lines of first coordinator, signal at output of which has maximal value; y2B and y2H - coordinates of upper and lower photo-elements of lines of seconds coordinator, signal at output of which has maximal value. Device for realization of method consists of first and second optical-electronic coordinators with matrix photo-receivers, first and second subtraction blocks, first and second square-law generators, first and second dividers, adder, square root extractor block, first and second arctg calculation blocks, outputs of which are outputs of device, while first and second outputs of optical-electronic coordinator are connected respectively to first and second inputs of first subtraction block, first output of which is connected to input of first square-law generator, second output - to first input of first divider, first and second outputs of second optical-electronic coordinator are connected respectively to first and second inputs of second subtraction block, first output of which is connected to input of second square-law generator, second output - to second input of first divider, output of first divider is connected to input of first arctg calculation block, outputs of first and second square-law generators are connected to appropriate inputs of adder, while output of adder is connected to input of square root extractor block, output of which is connected to first input of second divider, onto second input of which value d is fed, output of divider is connected to input of output arctg calculation block. |
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Method includes simultaneously receiving signals of natural background radiation in spectral range of reflected laser radiation, and receiving continuous optical signals in spectral range of natural background radiation from observed volume of space, after transformation of received optical signals to video signal from first video signal, appropriate for reflected laser radiation, video signal is subtracted element-wise, appropriate for optical signal of natural background radiation in spectral range of reflected laser radiation, threshold selection of difference video signal is performed, and from the number of video signals, exceeding the threshold, video signals are selected, appropriate for code-pulse modulation of laser radiation and if such signals are present, alarm signal is generated, simultaneously from difference video signal, exceeding the threshold, and video signal, appropriate for continuous optical signal in spectral range of natural background radiation with consideration of parallax, and after transformation of composite video signal to optical image, position of detected optical means is fixed relatively to characteristic objects on the map of local area. |
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In known method for one-positional measurement of angular coordinates of laser emission source, based on use of scanning optical systems and determination of angular coordinate of laser emission source on basis of angular position of scanning system at the moment when maximum value of useful signal is achieved, scanning of vicinity in selected observation sector is performed due to alternation of heterodyne signal phase front position, and angular coordinate of laser emission source is determined on basis of its angular position at the moment when maximum value of useful signal is achieved. Device for realization of method consists of photo-detector mounted on rotary platform with forming optics and of semi-transparent, held, mounted at an angle of 45° to optical axis, plate, block for processing signal at output of photo-detector, heterodyne, and also of serially connected block for forming parameters of phase front of heterodyne signal and block for controlling phase front of heterodyne signal, while second output of block for forming parameters of phase front of heterodyne signal is connected to second output of signal processing block, second input of block for controlling phase front of heterodyne is connected to output of heterodyne, and output - to second input of photo-detector. |
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Method comprises subtracting reference and current images, breaking the image series to be processed into fragments, and converting the characteristic features of the images into signals. The signals from one of the images are recorded as reference ones and are compared, e.g., by subtracting, with corresponding current signals, and, after the threshold processing, the difference signals obtained are converted into the binary signals for control of spatial filtration . As a result, the fragments of the current image, for which the control signals exceed the threshold, are transmitted, whereas the fragments, for which the signals are equal or less than the threshold value, are suppressed. |
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Method for detection of sources of laser radiation and counteraction of their receiving systems The device has a frequency-pulse laser with an objective lens secured on platforms rotating about the vertical axis, detection unit consisting of two detection sensors, and a control unit having k-flip-flops of the first and second detection sensors, k-AND gates of the first and second detection sensors, two NO gates two OR gates, two coding units, two permanent storage units, master oscillator, two arithmetic-logical devices, initial data input unit, azimuth computing unit, elevation angle computing unit and a laser radiation source height computing unit. |
Another patent 2513507.