265 results about "Corner reflector" patented technology

An apparatus comprises an interface and a processor. The interface may be configured to receive pixel data representing a first field of view of a camera and four-dimensional (4D) point cloud data representing a second field of view of a 4D imaging radar sensor. The first field of view of the camera and the second field of view of the 4D imaging radar sensor generally overlap. The processor may be configured to process the pixel data and the 4D point cloud data arranged as video frames and perform an extrinsic parameter calibration for the 4D imaging radar sensor and the camera based on adaptive projection error. The extrinsic parameter calibration may comprise applying a pose calibration process to the video frames. The pose calibration process may use (i) a respective translate vector and a respective rotation matrix for each of the 4D imaging radar sensor and the camera and (ii) a radar corner reflector to obtain configuration parameters for the first field of view of the camera and the second field of view of the 4D imaging radar sensor. The pose calibration process generally comprises capturing data for a plurality of positions of the radar corner reflector between a near-distance value and a long-distance value, and modifying a scale of a projection error of the radar corner reflector based on a size of the radar corner reflector in an image captured by the camera.

The invention provides a highway facility wide-area remote sensing detection method for alpine regions, and the method achieves the automatic recognition of hidden troubles, such as subgrade settlement, cracks, slope slippage, bridge deformation, and the like, through the fusion of an optical remote sensing image and an SAR remote sensing image. The method comprises the following steps: firstly, carrying out ortho-rectification, filtering processing and mutual information joint registration on an optical image and an SAR image to ensure that multi-source data is aligned at a pixel level; then, training samples are marked by utilizing road vector data and historical hidden danger pattern spots, and the sample size is enhanced and expanded through single-sample and multi-sample data; in model construction, an optical branch and an SAR branch extract low-level and high-level features respectively, a cross attention fusion module fuses complementary information of the optical branch and the SAR branch, and a cavity space pyramid further improves the multi-scale perception capability. And finally, completing classification and positioning by adopting multi-stage regression and a classifier, and additionally arranging a corner reflector in an ice and snow area or a low-coherence area so as to improve the identification precision.

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.

The invention relates to an installation structure and a precision adjustment method of a long-distance laser target tracking and ranging light path, which are used for high-precision adjustment of a laser emission direction of a space target tracking and ranging light path. And the deviation between the emergent direction of the laser reflected by the three reflectors and the swing angle of the rotary table is minimum. The method comprises the following steps: firstly, leading a pitch axis and an azimuth axis to a plane mirror by using an autocollimator; secondly, a second reflecting mirror and a first reflecting mirror are installed and adjusted through the installation mode of a cushion column and a fastening screw, the grinding amount of the cushion column is calculated according to the back image motion track of an autocollimator or the motion track of a laser imaging point in a measurement camera, the cushion column is ground on the basis, and the purpose of high-precision installation and adjustment is achieved; thirdly, through zero calibration of a visible light camera, a measurement camera and a corner reflector, an adjustment system of a third reflector is built, and adjustment of the third reflector is achieved; finally, the cushion columns and the fastening screws are reinforced through epoxy glue, and the mechanical resistance of the light path is guaranteed.

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.

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.

The invention belongs to the technical field of slope deformation monitoring, and aims to provide a slope deformation monitoring system and method based on millimeter wave radar. The slope deformation monitoring system comprises a corner reflector, a first radar and a second radar, the corner reflector is arranged at a specified monitoring point of a target slope, and the first radar and the second radar are arranged in cooperation with the corner reflector. The first radar and the second radar are respectively used for collecting angle inverse distance information between the first radar and the corner reflector and between the second radar and the corner reflector so as to obtain space deformation information of the corner reflector. The slope deformation monitoring method is realized based on the slope deformation monitoring system. The method can reduce the hardware cost of applying the millimeter wave radar to slope deformation monitoring, and is suitable for a large-scale slope deformation monitoring scene.

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 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.

The invention relates to a millimeter wave radar-IMU external parameter calibration method, device and equipment and a storage medium, and the method comprises the steps: obtaining the global positioning coordinate of at least one corner reflector, the global positioning coordinate of a motion carrier, and a plurality of initial point cloud coordinates of each corner reflector; determining a target point cloud coordinate of each corner reflector from the plurality of initial point cloud coordinates of each corner reflector based on the global positioning coordinate of each corner reflector and the global positioning coordinate of the motion carrier; and converting the global positioning coordinate of each corner reflector into an IMU coordinate system to obtain an IMU coordinate of each corner reflector, carrying out coordinate association on the target point cloud coordinate of each corner reflector and the IMU coordinate of each corner reflector, and solving based on an iterative least square method to obtain an external parameter of the millimeter wave radar-IMU. Therefore, the problem of insufficient precision and robustness of millimeter wave radar-IMU calibration in a complex environment is solved, and the calibration precision and the system robustness in a dynamic environment are greatly 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 discloses a landslide monitoring method based on radars, electronic equipment and a storage medium, and the method comprises the following steps: taking a corner reflector arranged on a monitored mountain as a target, and obtaining the displacement information of the corner reflector at the same time through more than three millimeter wave radars arranged outside the monitored mountain; any millimeter-wave radar is used as a central point, displacement information of the angle reflex measured by the other millimeter-wave radars is received, and based on the three-dimensional coordinate value of each millimeter-wave radar and the initial three-dimensional coordinate value of the angle reflex, the displacements delta x, delta y and delta z of the angle reflex in three dimensions under the Cartesian coordinate system are calculated; outputting the three-dimensional coordinate value of the current angle in real time; and comparing the three-dimensional coordinate value of the current angle with a set threshold value to realize early warning of the monitored mountain. According to the invention, the displacement of the angle reflector in three dimensions under the Cartesian coordinate system can be accurately calculated, and all-dimensional and multi-dimensional accurate monitoring of the mountain displacement is realized.

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 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.

The invention discloses a long-distance high-precision six-degree-of-freedom absolute pose calibration method and system. The method comprises the steps that the absolute pose relation among an LED active target, a first corner reflector, a relative measurement target device and a target platform is determined; absolute pose measurement between the coordinate system of the sensor platform and the coordinate system of the target platform is carried out nearby; enabling the sensor platform and the target platform to perform relative motion, and performing relative measurement of the six-degree-of-freedom pose variation in the motion process; calculating an absolute pose relationship between the sensor platform and the coordinate system of the target platform at a long distance; and solving the pose relation between the sensors. According to the invention, under the condition of long-distance and high-precision absolute six-degree-of-freedom measurement of a multi-sensor combination, high-precision calibration of the internal pose relation of the sensor, especially high-precision calibration between optical coordinate systems of optical sensors, can be realized.

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.

The utility model discloses an INSAR radar corner reflector fixing support, and belongs to the technical field of corner reflectors, the INSAR radar corner reflector fixing support comprises a base, a support and an adjusting assembly, the base is provided with a limiting groove in the circumferential direction, and the base is detachably installed at a preset position through a locking piece; the bracket is movably mounted on the base in a limiting manner; one end of the support is movably connected with the corner reflector, and the other end of the support is provided with an adjusting assembly in transmission connection with the corner reflector. According to the utility model, the bracket is movably arranged on the base in a limiting manner, so that not only can the accurate position adjustment of the corner reflector in a horizontal plane be realized, but also the installation deviation can be compensated, the adjustment range is expanded, and the accuracy and the reliability of monitoring data are effectively ensured; the orientation of the corner reflector in the horizontal plane can be adjusted by loosening and tightening the locking piece, the operation is simple, and the standard requirement of high-precision INSAR monitoring can be met; precision pitch angle adjustment of the corner reflector can be achieved through the adjusting assembly, and the requirement that the corner reflector is accurately aligned with the view direction of a satellite radar is met.

The invention relates to a rapid parallelism adjustment and self-calibration method for a laser transceiving common-path system based on a corner reflector / cube-corner prism, relates to the technical field of optical-mechanical structures and adjustment, and solves the problems that in the prior art, a traditional method depends on large-scale detection equipment in a laboratory; and self online calibration of the laser transmit-receive common-path system cannot be realized. Comprising the following steps: a reference emission light path passes through a shaft; a self-reflection loop is formed based on the corner reflector / cube-corner prism, and adjustment is carried out to enable the convergence light spot to be minimum; angle adjustment is carried out based on an adjustment structure in each receiving sub light path; a self-reflection loop is formed, and adjustment is carried out to minimize a convergent light spot; angle adjustment is carried out based on an adjusting structure in each transmitting sub-light path, so that the imaging centroid positions in each receiving sub-light path are the same as far as possible. According to the method, the original path return principle of the corner reflector / cube-corner prism is utilized, precise pose adjustment is not needed, and the installation and adjustment complexity is greatly reduced.

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.

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.

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 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.

The invention discloses an inflatable corner reflector, and belongs to the technical field of electromagnetic reflection, the inflatable corner reflector comprises an inflatable column frame, a corner reflector and a protective cover cloth, the inflatable column frame is composed of twelve inner air columns and thirty outer air columns, and the inflatable column frame is of a regular icosahedron structure after being inflated and unfolded; wherein one ends of the twelve inner air columns converge at the center of the regular icosahedron and are communicated with one another, the other ends of the twelve inner air columns extend outwards to correspond to the vertex of the regular icosahedron, and the thirty outer air columns are respectively communicated with the extending end parts of the two adjacent inner air columns; a corner reflector is arranged in each placing cavity, and the reflecting surface of each corner reflector is coplanar with the center line of the corresponding outer air column; the protective cover cloth wraps the outer contour of the inflatable column frame and covers all the corner reflectors. The overall size can be reduced, meanwhile, the inflation volume of the inflation column frame is reduced, the area of each reflecting face of the corner reflector is increased, the laying speed is increased, and the electromagnetic scattering sectional area is increased.

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.