161 results about "Corner reflector" patented technology

The invention discloses an icing monitoring method and system for a corner reflector deployed based on an unmanned aerial vehicle, and relates to the technical field of environment monitoring, and the method comprises the steps: deploying a corner reflector network, collecting radar cross-section characteristics and environment parameters to generate a data packet, and carrying out the icing monitoring based on the generated data packet; calculating a signal-to-clutter ratio, obtaining a standard deviation of target positioning and phase estimation by using a Cramer-Rao lower bound method, generating a dynamic weight by using the standard deviation, obtaining a corner reflector icing thickness estimation value through data fusion, and generating an optimized signal-to-clutter ratio based on the icing thickness estimation value; and carrying out cooperative judgment by utilizing the generated optimized signal-to-clutter ratio and combining the icing thickness and the attitude deviation, triggering combined adjustment based on a judgment result, and after the combined adjustment is triggered, obtaining the SAR image again and carrying out main and auxiliary image registration and interference pair optimization. According to the invention, the sensing precision and the monitoring robustness of the unmanned aerial vehicle on the state of the corner reflector in an icing environment are improved.

The invention relates to a high and steep slope real-time monitoring method and system based on multi-source data fusion and cooperative enhancement. The method comprises the following steps: scanning a slope provided with a corner reflector array by using a synthetic aperture radar (SAR); performing real-time differential correction on data acquired by the radar by taking the corner reflector in the stable region as a reference so as to eliminate common noise; meanwhile, a three-dimensional laser scanner is used for obtaining point cloud data of the slope; coordinate registration and fusion of radar data and point cloud data are realized through the corner reflector array, so that a three-dimensional deformation field of the slope is generated. The method provided by the invention has the advantages of high monitoring precision, high signal-to-noise ratio and good data reliability.

The invention provides a rain measuring radar calibration and data correction method, and the method comprises the steps: obtaining the first observation coordinates of each corner reflector in a target region through a rain measuring radar, and obtaining the real coordinates of each corner reflector; and based on the first observation coordinates of the corner reflectors and the real coordinates of the corner reflectors, determining a correction model of the rain-measuring radar to complete model calibration of the rain-measuring radar. The correction model can be used for correcting rain measurement data of a rain measurement radar to obtain corrected rain measurement data. According to the method, the correction model is established by adopting the association between the coordinates and the real coordinates in the distributed corner reflector image, so that the geometric calibration of the rain radar image is realized, the accuracy of the coordinates of the rain radar can be improved, the geometric error of the existing rain radar caused by the antenna position offset and the antenna pointing offset is solved, and the accuracy of the rain radar image is improved. And the accuracy of the rain measurement data monitored by the rain measurement radar is not accurate.

An image display device includes an imaging element, a light source, a detecting part, and a controller. The imaging element includes a base member including a first surface, and a reflector array on the base member. The reflector array includes multiple reflector rows, each including multiple dihedral corner reflectors along a first direction. The multiple reflector rows are arranged parallel to a second direction crossing the first direction. The multiple dihedral corner reflectors each include a first reflecting surface, and a second reflecting surface orthogonal to the first reflecting surface. A tilt of a second orthogonal reflector is set to form a floating image at the first surface side. The light-transmitting member is arranged to transmit twice-reflected light of the imaging element. The light-shielding member shields a portion of light other than the twice-reflected light.

The application provides a SAR ground calibration corner reflector auxiliary installation device and installation method, which comprises a mounting frame, an azimuth angle adjusting device, an elevation angle adjusting device and a reference assembly. The mounting frame is used for supporting on the ground. A triangular pyramid positioning body is connected with an elevation angle pointer of the elevation angle adjusting device through a telescopic connecting rod, and the azimuth angle adjusting device is used for adjusting the azimuth angle. The elevation angle adjusting device rotates synchronously with the azimuth angle pointer of the azimuth angle adjusting device, and the rotation plane of the elevation angle pointer is perpendicular to the azimuth angle pointer. When the azimuth angle and the elevation angle are adjusted to the position, the bottom edge of the reference surface of the triangular pyramid positioning body is parallel to the flight line, and the reference surface is coincided with a straight line which is perpendicular to the flight line and passes through the calibration point. At this time, the posture of the triangular pyramid positioning body is the same as that of the corner reflector. Since the triangular pyramid positioning body is similar to the corner reflector, the corner reflector only needs to be rotated to the position which is coincided with the triangular pyramid positioning body.

The invention discloses an unmanned aerial vehicle throwing type corner reflector and a throwing installation method and a positioning method thereof, and belongs to the technical field of deformation monitoring and positioning. The corner reflector comprises a base, a throwing hanger, a firing pin, at least five side plates and a corresponding number of connecting plates, the base, the connecting plates and the side plates jointly form an annular hemispherical shell propeller structure, reflectors are arranged on the upper end face of the base and the outer surface of each side plate, and all the reflectors are evenly distributed in a hemispherical surface mode in space. The distances from the center points of the reflectors to the center point of the corner reflector are equal, the lower end of the base is provided with a cutting part capable of penetrating into the ground when the corner reflector falls to the target ground, and the throwing hanging piece is connected with the upper end of the base. The corner reflector can meet the requirement for remote, rapid, stable and high-precision feature point arrangement in an emergency monitoring scene, and the key technical problems that in emergency monitoring, feature points are difficult to arrange, positioning is not accurate, and installation is not stable are solved.

The invention belongs to the technical field of synthetic aperture radars, and discloses a high mountain and valley region-oriented SAR corner reflector arrangement method, which realizes accurate positioning and installation angle optimization of an SAR corner reflector by introducing an MDDG model and an R index evaluation index and combining GNSS high-precision positioning and R-D equation iterative optimization, and improves the positioning accuracy of the SAR corner reflector. High spatial precision and long-term stability of InSAR monitoring are ensured; according to the method, after the SAR corner reflector is installed, the installation angle is optimized through RCS time sequence analysis and UAV image; according to the method, the installation stability, the signal reflection quality and the observation precision of the SAR reflector can be improved, the arrangement and positioning of the reflector can be optimized especially under complex terrain and environment conditions, and the problems of signal attenuation, shielding, positioning errors, signal aliasing and the like of the reflector in the prior art are solved.

The invention provides a circumferential synthetic aperture sonar imaging motion compensation method based on a corner reflector, and the method comprises the steps: S1, carrying out the projection imaging of echo data after matched filtering, and determining the height of the corner reflector through an image variance; s2, according to the height of the corner reflector, the focusing position of the corner reflector is determined through the preliminary imaging result; s3, the distance between the corner reflector and the sonar is calculated according to the echo data when echoes are received each time; and S4, correcting the position of the sonar according to the focusing position of the corner reflector determined in the step S2 and the distance determined in the step S3, and performing projection imaging according to a new sonar position and echo data. According to the method, the corner reflector is used as an imaging reference target, the image quality of circumferential synthetic aperture imaging is improved, and the method is of great significance in reducing the calculation time of a self-focusing algorithm, improving the target imaging quality and the like.

The application discloses a heat control method and device for improving performance of a lunar orbit laser corner reflector, and belongs to the technical field of aerospace. The method comprises the following steps: in a non-test stage, analyzing the illumination and thermal environment data of the corner reflector in a lunar orbit, and designing heat dissipation and heat insulation measures so that the corner reflector is in a low-temperature storage stage; in a preparation test stage, starting a heating belt for preheating, collecting temperature data of each region of the corner reflector, combining a novel PID temperature control algorithm and an external heat flow prediction model, and independently adjusting the duty cycle of each heating belt; in a test process, starting the heating belt, and performing real-time monitoring and adjustment on each region of the corner reflector; when the temperature deviates, the duty cycle of the heating belt is adjusted through the novel PID temperature control algorithm and the external heat flow prediction model; and after the test is completed, the corner reflector reenters the low-temperature storage stage. The application can ensure high precision and high reliability of the laser corner reflector in the lunar orbit, and improves the success probability of laser ranging of the corner reflector on a lunar orbit spacecraft on the ground.

The invention belongs to the technical field of corner reflector design, and particularly relates to a corner reflector design method with a controllable RCS directional diagram and a corner reflector.The design method specifically comprises the steps that a simulation model of a corner reflector simulation structure unit is established, and the model comprises a bottom face and two intersecting planes which are perpendicular to the bottom face and are the same in size; according to a plurality of set hollowed-out proportions, carrying out hollowed-out processing on the junction of the vertically intersected planes, carrying out simulation to obtain a backward RCS directional diagram coverage angular domain range of the corner reflector under different hollowed-out proportions, and carrying out fitting to obtain a relation between the backward RCS directional diagram coverage angular domain range and the hollowed-out proportions; performing side length adjustment on the junction of the perpendicular line intersection planes according to a plurality of set side length proportions, performing simulation to obtain action angle domain deflection under different side length proportions, and performing fitting to obtain a relation between the action angle domain deflection and the side length proportions; and according to the hollowed-out proportional relation and / or the side length proportional relation, the backscattering characteristic of the corner reflector is controlled.

The invention provides a positioning method and device of tunnel construction equipment, equipment and a storage medium, and relates to the field of tunnel positioning. Comprising the following steps: acquiring three-dimensional coordinate information of a plurality of corner reflectors in an area where to-be-positioned tunnel construction equipment is located; obtaining dynamic pixel coordinate information of the corner reflector through a visual module of the tunnel construction equipment to be positioned; determining a conversion relation between a millimeter wave radar coordinate system and an image pixel coordinate system according to the three-dimensional coordinate information and the dynamic pixel coordinate information; determining a radar observation equation of the corner reflector and the millimeter-wave radar module according to a conversion relation between the millimeter-wave radar coordinate system and the image pixel coordinate system; and determining the pose of the tunnel construction equipment to be positioned according to the radar observation equation. The technical problems that the accuracy of an existing tunnel positioning technology is less affected by the dust environment, laser is seriously scattered in the high-dust environment, the effective distance is shortened, and the positioning efficiency of tunnel construction equipment is reduced are solved.

The application discloses a corner reflector array design method based on scattering center extraction, which studies and analyzes electromagnetic scattering characteristics of metal targets in a complex scene, and provides a feasible scheme for electromagnetic concealment of important targets, and specific contents comprise the following steps: a property scattering center model of a target is extracted according to a radar echo, and coordinate parameters of the model are used for initial arrangement of the corner reflector array; a structural similarity is used as a target function to optimize the corner reflector array, and is used as a quality evaluation index of arrangement of the corner reflector array; and finally, a false target similar to scattering characteristics of the target is obtained by constructing the corner reflector array. According to the method, the arrangement of the corner reflector array in the complex scene has a hiding performance of more than 90% to the target, and has high similarity compared with a radar image of the target.

This invention relates to the field of electromagnetic properties technology, and particularly to an electrically controlled foldable corner reflector. An electrically controlled foldable corner reflector includes a first reflector, a second reflector, and a third reflector, all in the shape of a right-angled triangle. Each of the first, second, and third reflectors includes a first right-angled side and a second right-angled side. The first right-angled side of the first reflector is hinged to the first right-angled side of the second reflector, and the second right-angled side of the second reflector is hinged to the first right-angled side of the third reflector. The second right-angled side of the third reflector is detachably connected to the second right-angled side of the first reflector. This invention provides an electrically controlled foldable corner reflector that is convenient for storage and transportation.

The utility model relates to the technical field of radar reflectors, in particular to a multi-degree-of-freedom corner reflector used on a target ship. The top of each support set is provided with a rotating mechanism, the top of each support set is provided with a rotating mechanism, the top of each rotating mechanism is provided with a fixing frame, the side face of the fixing frame is horizontally provided with rectangular corner reflectors, and the support sets are matched with one another so that the rectangular corner reflectors can be distributed in a surrounding mode in the horizontal direction. And a triangular angle reflector with an adjustable pitch angle is arranged at the top of the fixed frame. When the signal position of the target ship is found, the rectangular corner reflector and the triangular corner reflector facing other directions are rotated to be opposite to the target direction, so that the position of the target ship is effectively handled and accurately positioned.

The application discloses a visible light and laser radar aerial survey target, and relates to the field of aerial surveying and mapping, which comprises a transparent box body, a composite corner reflector and an adjustable supporting mechanism. A visible light image control pattern is arranged on the top plate of the transparent box body, and the geometric center of the visible light image control pattern is coaxially locked with the geometric center of the composite corner reflector with multiple symmetrical corner reflection units in the box. Regardless of the change of the ground slope and the angle of the box body, there is no relative displacement, and the systematic registration error caused by the center misalignment due to the two-time layout of the separated target is completely eliminated from the physical structure. The box body is adjusted to be absolutely horizontal through the adjustable supporting mechanism, the visible light image control pattern is guaranteed to be perpendicular to the unmanned aerial vehicle aerial photography optical axis without perspective distortion, the laser signal capture rate is improved through the configuration of the composite corner reflector comprising multiple symmetrical corner reflection units, and the aerial survey precision in mountainous areas is significantly improved.

The application discloses a target detection method and system based on radar and radiometer cooperative sensing, and belongs to the technical field of target detection, which comprises the following steps: S1, acquiring a first source image and a second source image obtained by respectively detecting a same scene by using a radar sensor and a radiometer sensor; S2, after pre-processing the first source image and the second source image, performing target detection to obtain a first target image and a second target image; and S3, after fusing the first target image and the second target image, obtaining the position of a real target. The application considers that the radar sensor has the characteristics of high resolution and distance measurement, and the radiometer sensor has the characteristics of resisting interference from corner reflector and the like, target detection is performed on the imaging results of the radar and the radiometer, and then the radar and the radiometer are fused, the difference of information obtained by different sensors can be fully utilized, complementation between information is realized, the anti-interference capability of detection is improved, and therefore the accuracy of target detection is effectively improved.

The utility model relates to the field of wireless communication, in particular to a tetrahedral reflector antenna housing. Comprising a cover body formed by a four-side conical structure and a fixing buckle, the fixing buckle is of an L-shaped structure, and the outer end of the short edge of the fixing buckle is connected with a semicircular limiting piece; the diameter of the semicircular limiting piece is larger than the width of the long-strip hole in the cover body and smaller than the length of the long-strip hole. The fixing buckle penetrates through the long-strip-shaped hole in the radome body and the long-strip-shaped hole in the L-shaped connecting piece of the four-side corner reflector to fix the radome and the four-side corner reflector. The four-side conical structure of the antenna housing of the four-side corner reflector can enable wind, sand, rain and snow to slide down, the influence of accumulation on the four-side corner reflector is avoided, and the antenna housing is of a foam glass fiber reinforced plastic sandwich structure and has excellent electrical performance, corrosion resistance and wave-transparent performance. Erosion of severe environments such as wind, sand, rain and snow can be prevented, and normal use of the corner reflector cannot be affected. The four-side corner reflector antenna housing is simple in structure and high in practicability, and can be quickly mounted and dismounted.

The present application relates to the technical field of optical axis calibration, and particularly relates to a laser range finder collimation system using a CCD matrix, which comprises a hollow corner reflector, an off-axis parabolic metal reflector, a rotating reflector, a first diagonal beam-splitting reflector, a second diagonal beam-splitting reflector, a laser radiation imaging instrument, a CCD matrix, a computer and an LED emitter. The present application solves the problem of high-precision alignment of the laser emission channel and the laser receiving channel of the laser range finder, and can be applied to the optical axis calibration of most photoelectric devices and lasers, quickly aligns the channels in different spectral ranges, and can use continuous and pulsed lasers for operation. The present application can solve the problem of spatial position coordination of focusing on a single component and the channel axis, and can realize optical axis calibration through the configuration of the hollow corner reflector and the rotating reflector, and can realize optical axis offset visualization and quantification through the cooperation of the laser radiation imaging instrument and the CCD matrix, thereby simplifying the collimation process and improving the precision of the device collimation axis.

This invention relates to the fields of geodesy and radar engineering technology, and discloses a method, apparatus, and electronic equipment for the directional deployment of corner reflectors. The method includes: determining two measurement reference points in the proposed deployment area of ​​the corner reflector and obtaining the geodetic coordinates of the measurement reference points, and then calculating the reference azimuth angle of the baseline between the measurement reference points relative to true north; using the reference azimuth angle as a reference, marking two auxiliary points in the proposed deployment area of ​​the corner reflector and determining the local physical baseline; obtaining the design azimuth angle of the corner reflector and calculating the azimuth angle difference between the design azimuth angle and the reference azimuth angle; and using the local physical baseline as a reference, directionally deploying the corner reflector according to the azimuth angle difference. The method provided by this invention can still stably obtain an absolute physical reference pointing to true north even in extreme electromagnetic environments such as substations and building complexes, realizing high-precision deployment of corner reflectors in areas with strong interference.

The application discloses a kind of based on open-pit mine slope radar's damage mode identification method, based on the displacement of corner reflector measured according to the coordinate change of each corner reflector in three-dimensional coordinate system monitored each time by slope radar, according to the size of displacement, the corner reflector of preliminary screening exists abnormal motion;The corner reflector of preliminary screening is carried out clustering analysis, and the corner reflector of all preliminary screening is split into multiple different by corner reflector Abnormal deformation set formed;Build damage mode identification model, respectively to the spatial displacement change characteristics of all the abnormal deformation set by multiple corner reflectors is trained learning, to identify the corresponding relationship between the spatial displacement change characteristics corresponding to each damage mode and damage mode, to determine the four damage modes corresponding to abnormal deformation set;The application determines the corresponding relationship between the spatial displacement change characteristics of slope and damage mode, so that the damage mode corresponding to different regions can be managed by partition targeting.

The utility model relates to the field of radar wave reflectors, and particularly discloses a real-time adjustable radar wave dihedral corner reflector which comprises two radar wave reflectivity adjustable material plates which are perpendicular to each other, and each radar wave reflectivity adjustable material plate comprises a backing layer and a reflectivity adjustable material layer fixedly arranged on the backing layer. The antenna can form a strong electromagnetic wave reflection effect in multiple directions, is suitable for carrying out conformal design with equipment, and is beneficial to reducing the cost and improving the multi-scattering problem compared with a trihedral angle structure.

This utility model provides a projectile device and a corner reflector launching system, relating to the field of corner reflector launching technology. By installing a slow-descent device and a corner reflector device respectively in a first cavity and a second cavity formed inside the projectile casing, after the launching device launches the projectile casing, when it reaches the designated airspace, the separation rope tightens, causing the projectile casing to stop. Due to the setting of the first connecting rope, the slow-descent device will continue to move forward due to inertia, realizing the separation of the slow-descent device from the projectile casing. After the first connecting rope is tightened, the slow-descent device stops. Due to the setting of the second connecting rope, the corner reflector device will continue to move forward due to inertia until the second connecting rope tightens, thereby realizing the separation of the corner reflector device from the slow-descent device. The gradual separation of the slow-descent device and the corner reflector device can be achieved without the need for mechanical and electrical structures.

The application discloses a transceiver separation laser communication system with on-orbit calibration function and an on-orbit calibration method thereof, and solves the problem that the existing transceiver separation laser communication systems cannot calibrate the optical axis of a signal transmitting channel and the optical axis of a signal receiving channel on orbit, the application reflects output laser to the direction of the optical axis of an objective lens through a pre-sighting reflector, sets a transmitting light path beam splitter and an angle reflector on the light path of the output laser reflected by the pre-sighting reflector, and has the same basic function (i.e. transceiver function) as the traditional transceiver separation laser communication system, and has a unique on-orbit calibration function of consistency of transceiving optical axes, so that the transceiving optical axes can be calibrated at any time, and the influence of satellite emission, on-orbit microgravity release and space environment thermal alternation on the capture and tracking of transceiving laser (i.e. input laser and output laser) is avoided.

The invention relates to a radar module test system and method, electronic equipment and a storage medium. The radar module test system comprises an upper computer and a first driving device. And a second driving device. A corner reflector and a radar module; the first driving device communicates with the upper computer, the second driving device communicates with the upper computer, and the first driving device is located on one side of the second driving device; the corner reflector is arranged on the first driving device; the radar module is arranged on the second driving device and communicates with the upper computer; the upper computer drives the corner reflector to move by controlling the first driving device, and the upper computer drives the radar module to move by operating the second driving device, so that an angle and a distance exist between the corner reflector and the radar module, and the test is completed. According to the scheme provided by the invention, the radar module can be automatically and intelligently tested, so that the efficiency is improved.

The invention discloses a slope radar precision correction monitoring system and method based on a corner reflector, and the method comprises the steps: constructing an initial atlas between the corner reflector and a radar scanning angle, and constructing an initial slope state atlas between the displacement / deformation rate of each monitoring point in a monitored region and the radar scanning angle; when the side slope radar is in a precision correction mode, the side slope radar sequentially obtains each monitored corner reflector based on a set rotation angle and forms a corner reflector real-time atlas, and displacement deviation existing in the side slope radar is determined based on the position difference between the initial atlas and the corner reflector real-time atlas; when the side slope radar is in a dynamic monitoring mode, forming a real-time side slope state map of the monitored area, regenerating a real-time side slope state map after angle compensation, and performing point-to-point comparison on the real-time side slope state map after compensation correction and the initial side slope state map to determine the change of the monitored side slope; according to the invention, the monitoring precision of the mine pit slope is improved.

Method and system of electronic countermeasure comprising an airborne RF and IR decoy, being an independent, autonomous flying body that flies on its own, using its own aerodynamics, rotatable blades and fins, being applied as protection against Radio Frequency (RF) and infrared (IR) threats. Such an aircraft decoy comprises a body; a rotatable blade or vane disposed on the body; a power source capable of generating electrical current in response to rotation of the blade or vane; a wideband radar jammer responding to a radar signal with a wideband phantom radar signature corresponding to a phantom target; corner reflectors generating strong radar reflections corresponding to the phantom target; and an infrared source emitting a phantom infrared signature corresponding to a heat signature of the phantom target. Data stored within the decoy is destroyed automatically upon impact.

The application discloses a device for high-precision laser time-frequency transmission of a region, which comprises a low-jitter picosecond laser, a laser emission light path, a measurement control and processing module, a single-photon detector, a laser receiving light path, a monitoring camera, a corner reflector and a box. A plurality of sets of the device can form a regional time-frequency transmission network. A clock signal is connected to the device, the low-jitter picosecond laser outputs a laser pulse time-frequency signal under the triggering of the measurement control and processing module, the laser pulse time-frequency signal is emitted from the laser emission light path, the monitoring camera aims at a remote device, and the laser echo returned from the remote device and the laser emitted by the remote device are received by the laser receiving light path and then the single-photon detector. The laser emission light path and the laser receiving light path form a local calibration by a beam splitter, and the distance of the remote device and the time-frequency difference are obtained through data processing. Meanwhile, the corner reflector can reflect the laser of the remote device, the distance of the local device and the time-frequency difference are obtained, and thus the regional free-space laser time-frequency transmission network can be formed.

The invention belongs to the technical field of coal mining machine collision prevention, and discloses a coal mining machine and hydraulic support collision prevention early warning method which comprises the steps that a plurality of recognition structures are installed at the position, to be recognized, of a hydraulic support, the recognition structures comprise a plurality of corner reflectors, and the position, to be recognized, of the hydraulic support comprises a face guard or a top beam; echo signal data of the to-be-recognized part are obtained through a radar; inputting the echo signal data into a contour recognition model for contour recognition, and outputting contour data of the to-be-recognized part; wherein the contour recognition model is constructed based on a convolutional neural network; the distance between the coal mining machine and the hydraulic support is judged based on the contour data of the to-be-recognized part, and when the distance between the coal mining machine and the hydraulic support is smaller than a preset collision threshold value, a collision early warning and protection strategy is sent out. According to the technical scheme, the contour of the side protection plate / top beam structure of the hydraulic support can be rapidly and correctly recognized, and then anti-collision early warning of the coal mining machine and the hydraulic support is achieved.

The present application relates to the technical field of satellite calibration, and in particular to a SAR satellite absolute radiation calibration method, device, equipment and storage medium, wherein the SAR satellite absolute radiation calibration method comprises: determining a natural distribution target as a calibration field; imaging the calibration field respectively to obtain a calibrated SAR image and a medium-high orbit SAR image; establishing a corresponding relationship between noise power and an incident angle, and removing noise power from the calibrated SAR image and the medium-high orbit SAR image based on the corresponding relationship; performing geometric consistency processing; calculating the backscattering coefficient of the calibration field; and calculating the calibration constant of the medium-high orbit SAR satellite to be calibrated. The above method solves the technical bottleneck of difficulty in arranging a large-size corner reflector outside the field and inability to cover the full field of view of large-width imaging by introducing a calibrated SAR satellite as a radiation reference and combining it with the natural distribution target.