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216 results about "Corner reflector" patented technology

A corner reflector is a retroreflector consisting of three mutually perpendicular, intersecting flat surfaces, which reflects waves back directly towards the source, but translated. The three intersecting surfaces often have square shapes. Radar corner reflectors made of metal are used to reflect radio waves from radar sets. Optical corner reflectors, called corner cubes, made of three-sided glass prisms, are used in surveying and laser ranging.

Calibration method and calibration system for multiple groups of radar external parameters of unmanned mine car

The invention relates to the technical field of intelligent gateways, in particular to an unmanned mine car multi-group radar external parameter calibration method and calibration system. The unmanned mine car multi-group radar external parameter calibration method comprises the following steps that a foam rectangular calibration plate serves as a core, a novel calibration plate frame is designed in cooperation with a corner reflector, and meanwhile a small calibration field capable of meeting unmanned mine car multi-laser radar and millimeter wave radar external parameter calibration tasks is designed based on the calibration plate frame; and performing laser radar data recording on the miniaturized calibration field to obtain laser radar point cloud data in the calibration field, and realizing calibration target extraction and constraint extraction according to the point cloud data of the calibration field. The method is suitable for unmanned mine car multi-laser radar and millimeter wave calibration, the efficiency is improved, and therefore the problems that in the prior art, the unmanned mine car is poor in calibration process precision, insufficient in global optimization and expansibility and the like in the outdoor rugged environment are solved.
Owner:ANHUI UNIV

Laser radar angle resolution enhancement method and system

The invention relates to the technical field of laser radars, and provides a laser radar angular resolution enhancement method, which comprises the following steps of: obtaining a spatial direction priority according to a vehicle course, road information and target information obtained by a vehicle external sensor so as to dynamically adjust laser pulse density and energy level; scanning data generated after N circles of continuous scanning serve as a composite frame, the starting angle of each circle is shifted, multiphase filtering and coherent superposition are conducted in a digital domain, and the effective angular resolution is obtained. The invention further discloses a laser radar device, the method and the device can adjust the pulse density and energy distribution in the ROI direction in real time according to the dynamic scene of the vehicle, the total pulse number is kept unchanged, and the total power consumption is not increased. The effective horizontal angle resolution is improved through inter-frame phase offset and multi-phase synthesis. A corner reflector and an IMU (Inertial Measurement Unit) are integrated in the laser radar, and phase and ranging errors are corrected in real time through periodic loopback calibration, so that the angle stability is kept.
Owner:FUJIAN CHUANZHENG COMM COLLEGE

Target for microwave radar and computer vision fusion displacement measurement, calibration method and system thereof

The invention discloses a target for microwave radar and computer vision fusion displacement measurement, a calibration method and a system thereof, belongs to the technical field of structural displacement measurement, and solves the problem that a proper target is lacked when microwave radar and computer vision are used for measuring displacement at the same time. The target covers a transparent calibration plate on the open surface of the corner reflector, and a uniform light diffuse reflection plate is attached to the interior of the transparent calibration plate; and a light source is arranged on the corner reflector. The transparent calibration plate is provided with special mark points and common mark points, the special mark points are distributed on two intersecting straight lines, the intersection points are the special mark points, and the spacing distances among all the special mark points are different. According to the calibration method, the position of the special mark point is verified by utilizing cross ratio invariance and simple ratio invariance. The measurement system adopts the target and the calibration method. According to the invention, three-dimensional displacement testing based on microwave radar and computer vision fusion can be realized, and the three-dimensional displacement change condition of a space point can be accurately obtained, so that the vibration displacement of an engineering structure can be monitored and early warned.
Owner:GUANGXI UNIV

Icing monitoring method and system for corner reflector deployed based on unmanned aerial vehicle

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.
Owner:STATE GRID HUBEI EXTRA HIGH VOLTAGE CO

Femtosecond optical comb large-size precision absolute distance measurement system in complex environment

The invention discloses a femtosecond optical comb large-size precision absolute distance measurement system in a complex environment. Comprising a source module, a beam splitter, a third dichroic mirror, a fundamental frequency femtosecond optical comb reference detector, a frequency doubling femtosecond optical comb reference detector, a fourth dichroic mirror, a frequency doubling femtosecond optical comb measurement detector, a fundamental frequency femtosecond optical comb measurement detector, a phase discriminator, a ranging zero point mirror and a corner reflector. The source module comprises an atomic clock, a femtosecond optical comb, an optical fiber beam splitter, a signal generator, an electro-optical modulator, a lens, a frequency multiplication module, a first collimation beam expander, a second collimation beam expander, a first dichroic mirror and a second dichroic mirror. According to the scheme, the defects that in the prior art, the measurement range is insufficient, complex industrial sites are difficult to adapt, and the real-time performance is poor are overcome, and a new way is provided for breaking through the technical bottleneck of large-range, high-precision, dead-zone-free, rapid and real-time measurement in a complex environment; and a technical support is provided for engineering application of a femtosecond optical comb precision distance measurement technology and development of a subsequent measurement prototype.
Owner:SHANGHAI AEROSPACE CONTROL TECH INST

High and steep slope real-time monitoring method and system based on multi-source data fusion and cooperative enhancement

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.
Owner:NANJING MEISHAN METALLURGY DEV

Rain measuring radar calibration and data correction method

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.
Owner:CHINA INST OF WATER RESOURCES & HYDROPOWER RES

Image display device

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.
Owner:NICHIA CORP

Thermal control method and device for improving performance of lunar rail laser corner reflector

The invention discloses a thermal control method and device for improving the performance of a lunar orbit laser corner reflector, and belongs to the technical field of space flight and aviation. The method comprises the following steps: in a non-test stage, analyzing illuminated 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 the test preparation stage, heating belts are started for preheating, temperature measurement data of all areas of the corner reflector are collected, and the duty ratio of all the heating belts is independently adjusted in combination with a novel PID temperature control algorithm and an external heat flow prediction model; in the test process, the heating belt is started, all areas of the corner reflector are monitored and adjusted in real time, and when temperature deviation occurs, the duty ratio of the heating belt is adjusted through a novel PID temperature control algorithm and an external heat flow prediction model; and after the test is completed, the corner reflector enters the low-temperature storage stage again. According to the invention, high precision and high reliability of the laser corner reflector on the lunar orbit can be ensured, and the success probability of laser ranging on the lunar orbit spacecraft corner reflector by the ground is improved.
Owner:DEEP SPACE EXPLORATION LABORATORY

Beam bridge structure performance state evaluation method and system based on microwave full-field perception

The invention discloses a beam bridge structure performance state evaluation method based on microwave full-field sensing, and the method comprises the following steps: S100, determining a monitoring point position according to a bridge structure form and a damage mechanism, laying corner reflectors, and completing the installation and positioning of microwave full-field sensing equipment; s200, sequentially transmitting, receiving and processing signals through the microwave full-field sensing equipment in the S100 to obtain response data of the structure; s300, establishing a finite element model for the bridge in the step S100, extracting theoretical response data of corresponding working conditions, and calculating static deflection, a transverse distribution coefficient and modal parameters of a bridge structure according to the actually measured data in the step S200; s400, comparing the structural static deflection, the transverse distribution coefficient and the modal parameter calculated in the step S300 with a threshold value calculated by a finite element, and if the data calculated in the step S300 exceed a theoretical threshold value range, identifying a damage grade and a damage position; the invention also discloses a corresponding evaluation system. Cost is reduced and detection efficiency is improved.
Owner:NINGXIA JIAOJIAN TRANSPORTATION TECH RES INST CO LTD +1

Ground-air-pipe multi-dimensional coupling PCCP pipeline health monitoring system and method

The invention discloses a ground-air-pipe multi-dimensional coupling PCCP pipeline health monitoring system and method, and belongs to the technical field of underground pipeline safety monitoring, and the system comprises an InSAR air monitoring unit, an artificial corner reflector array and a distributed optical fiber sensing unit. The PCCP pipeline is monitored from the air through the InSAR technology, and ground surface settlement rate abrupt change points and non-linear deformation areas are extracted through InSAR time sequence analysis; an adjustable artificial corner reflector is arranged along a vertical projection area of the pipeline, so that the phase incoherence problem of the InSAR technology in pipeline monitoring is improved, and the InSAR phase stability is enhanced; distributed optical fibers are pre-buried in the PCCP manufacturing stage and used for collecting pipe body strain data in real time, an abnormal space correlation map is constructed in combination with InSAR time sequence analysis data, and the hidden damage position and probability of an underground pipeline are deduced and inversely deduced through Bayesian causality. Omni-directional and multi-dimensional health monitoring from the ground and the air to the pipeline is achieved, the monitoring precision and reliability are effectively improved, and a powerful guarantee is provided for safe operation of the PCCP.
Owner:ZHENGZHOU UNIV

Millimeter wave radar measurement method considering multiple influence factors

The invention discloses a millimeter-wave radar measurement method considering various influence factors, and the method comprises the steps: carrying out the range finding refinement of a millimeter-wave radar, and carrying out the refinement of a range finding value in a precision interval based on a fast Fourier transform method and linear frequency modulation transformation; constructing a distance measurement error fine compensation model, and obtaining an accurate distance measurement value of the radar to the target; according to the distance, the azimuth angle and the pitch angle of the radar and the target after compensation, target coarse positioning is carried out, and a millimeter wave radar high-precision measurement model considering various influence factors is constructed by combining the single observation radar pulse measurement precision difference, the real distance and the signal-to-noise ratio comprehensive fixed weight. And high-precision measurement data of the millimeter wave radar considering various influence factors are obtained. The position of the corner reflector is obtained through spatial distance intersection. The problem of insufficient ranging precision of the millimeter wave radar is solved, the influence of radar electronic element delay, angle and meteorological factors is eliminated, and the rapid measurement of the geometric state of the track is realized by using a precise observation model.
Owner:CHINA RAILWAY DESIGN GRP CO LTD +1

Sar ground calibration corner reflector assisted emplacement apparatus and method

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.
Owner:AEROSPACE INFORMATION RES INST CAS

A non-periodic time-modulated corner reflector with wide-angle control and its harmonic spectrum conversion method

The present application provides a non-periodic time modulation corner reflector with wide-angle regulation and a harmonic spectrum conversion method thereof, the reflector comprising a time modulation metasurface and a three-face corner reflector structure; wherein the time modulation metasurface is a single plane structure composed of an active adjustable metasurface and a field programmable gate array (FPGA) time modulation control system. The conversion method comprises the following steps: step one, wide-angle time modulation corner reflector design; step two, non-periodic time modulation model establishment based on the wide-angle time modulation corner reflector; and step three, continuous harmonic spectrum conversion method based on the wide-angle time modulation corner reflector. The present application effectively improves the wide-angle stability of the time modulation metasurface by combining the time modulation metasurface with the corner reflector, and can control the harmonic spectrum distribution of the backward reflected electromagnetic wave in a wide-angle range. At the same time, a non-periodic time modulation model is established from the signal level, and the effect of reflective continuous harmonic spectrum conversion is realized.
Owner:NAT UNIV OF DEFENSE TECH

Unmanned aerial vehicle throwing type corner reflector and throwing installation method and positioning method thereof

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.
Owner:CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY

Layout method and device for SAR corner reflectors facing alpine and valley regions

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.
Owner:SANXIA JINSHAJIANG YUNCHUAN HYDROPOWER DEV CO LTD

Circumferential synthetic aperture sonar imaging motion compensation method based on corner reflector

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.
Owner:SHANGHAI MARINE ELECTRONIC EQUIP RES INST (NO 726 RES INST OF CHINA STATE SHIPBUILDING CORP) +1

A heat control method and device for improving performance of a lunar orbit laser corner reflector

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.
Owner:DEEP SPACE EXPLORATION LABORATORY

Design method of corner reflector with controllable RCS directional diagram and corner reflector

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.
Owner:CHINESE PEOPLES LIBERATION ARMY UNIT 92941 +1

Positioning method, device and equipment of tunnel construction equipment and storage medium

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.
Owner:CHINA RAILWAY CONSTR HEAVY IND

Corner reflector array design method based on scatter center extraction

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.
Owner:NANJING UNIV OF SCI & TECH

An electronically controlled foldable corner reflector

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.
Owner:BEIJING INST OF ENVIRONMENTAL FEATURES

Multi-degree-of-freedom corner reflector for target ship

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.
Owner:LIAONING JUNDAO INFORMATION TECHNOLOGY CO LTD

Visible light and laser radar surveying target

PendingCN122360395AOptical axisRadar
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.
Owner:BEIJING FOREVER TECH

Method and device for calibrating external parameters of millimeter wave radar-imu, equipment and storage medium

The application relates to a millimeter wave radar-IMU external parameter calibration method and device, equipment and a storage medium, wherein the method comprises the following steps: acquiring global positioning coordinates of at least one corner reflector, global positioning coordinates of a motion carrier and a plurality of initial point cloud coordinates of each corner reflector; determining target point cloud coordinates of each corner reflector from the plurality of initial point cloud coordinates of each corner reflector based on the global positioning coordinates of each corner reflector and the global positioning coordinates of the motion carrier; converting the global positioning coordinates of each corner reflector to an IMU coordinate system to obtain IMU coordinates of each corner reflector; performing coordinate correlation on the target point cloud coordinates of each corner reflector and the IMU coordinates of each corner reflector; and obtaining the external parameters of the millimeter wave radar-IMU based on an iterative least square method. Thus, the problem of insufficient precision and robustness of millimeter wave radar-IMU calibration in a complex environment is solved, and the calibration precision and system robustness in a dynamic environment are greatly improved.
Owner:WUHAN UNIV

A target detection method and system based on radar and radiometer collaborative perception

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.
Owner:HUAZHONG UNIV OF SCI & TECH

A long-distance and high-precision deformation measurement method based on corner reflector SAR phase information

The present invention belongs to the field of synthetic aperture radar (SAR) and discloses a long-distance, high-precision deformation measurement method based on corner reflector (SAR) phase information. The method comprises the following steps: S1, filtering a SAR image using an improved Lee filter algorithm to obtain a filtered SAR image; S2, performing registration processing on the filtered SAR image; S3, obtaining the position of each corner reflector in the registered SAR image; S4, estimating the elevation of the corner reflector; S5, compensating for the ground phase and the elevation phase to obtain an initial deformation phase; S6, unwrapping the initial deformation phase to obtain the true deformation phase of each corner reflector; and S7, obtaining the deformation amount based on the true deformation phase. By improving the existing Lee filter algorithm and filtering the SAR image based on an adaptive filter value, the present invention can effectively filter while avoiding oversmoothing, thereby facilitating the acquisition of more accurate deformation measurement results.
Owner:国网四川省电力公司电力应急中心

Radar test system

A radar testing system comprises a camera obscura, a target simulator, and a rotating mechanism, a linear driving mechanism and an angle reflection assembly which are installed in the camera obscura, the rotating mechanism is used for fixing a radar and driving the radar to move for radar testing, and the angle reflection assembly is connected to the linear driving mechanism. The linear driving mechanism is used for driving the angle reflecting assembly to move in the direction close to or away from the rotating mechanism so as to adapt to different types of radar tests, and the radio frequency part of the target simulator is arranged in the camera obscura. The radar test system is used for meeting test requirements of radars of various models, and resource waste is avoided.
Owner:JIANGSU KUMAN TECH CO LTD

PS-InSAR corner reflector fixing structure suitable for side slope

The utility model discloses a PS-InSAR corner reflector fixing structure suitable for a side slope. The PS-InSAR corner reflector fixing structure suitable for the side slope comprises a supporting rod, a concrete buttress and a fine aggregate concrete pouring body. A corner reflector to be fixed is connected with the concrete buttress through a supporting rod, the concrete buttress is arranged on the fine aggregate concrete pouring body, the fine aggregate concrete pouring body is poured in a side slope unconsolidated bed, the concrete buttress and the fine aggregate concrete pouring body are connected with each other through pre-buried threaded steel bars, and the concrete buttress and the fine aggregate concrete pouring body are connected with each other through the pre-buried threaded steel bars. And the twisted steel penetrates through the fine aggregate concrete pouring body and is inserted into the slope stabilizing layer. According to the PS-InSAR corner reflector fixing structure, the stability of the mounting base is ensured, and the safety and the stability of the corner reflector in extreme weather such as strong wind and rainstorm are greatly improved.
Owner:THREE GORGES JINSHAJIANG CHUANYUN HYDROPOWER DEV CO LTD