118 results about "Angular resolution" patented technology

The invention discloses a point cloud scanning method of a laser radar and the laser radar. The point cloud scanning method of the laser radar comprises the steps that light deflection angles corresponding to position areas with different point cloud angular resolutions in a view field area of the laser radar are acquired, and different light deflection angles correspond to different driving voltages; and applying the driving voltage corresponding to each light deflection angle to the liquid crystal phased array for point cloud scanning. According to the invention, different position areas in the field of view of the laser radar correspond to different point cloud angular resolutions based on the liquid crystal phased array light, the time for scanning the whole frame of image in the field of view is saved, and the image frame rate of the laser point cloud is improved. Moreover, as the liquid crystal phased array can freely control the deflection angle of the light, the point cloud angular resolution in the view field area is adjusted through the liquid crystal phased array, and the point cloud performance of the laser point cloud cannot be affected.

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 relates to a high-angular-resolution atmospheric detection laser radar acquisition and control system, and belongs to the technical field of atmospheric detection laser radar data acquisition. The system comprises an ARM main control module, an acquisition card and a scanning module, wherein the ARM main control module is internally provided with a multi-core CPU (Central Processing Unit), and when the system runs, a data reading process, a data processing process and a data storage process are respectively distributed to different cores of the multi-core CPU for parallel execution; the ARM main control module is used for issuing an instruction to the acquisition card and reading a hardware accumulation result of the acquisition card for processing and storing; the scanning module is controlled by the ARM main control module to perform continuous scanning; and the acquisition card is used for performing high-angle-resolution acquisition on aerosol observation data obtained in the continuous and rapid scanning process of the scanning module according to an instruction of the ARM main control module. According to the invention, the real-time monitoring capability of aerosol space-time distribution in a complex atmospheric environment is improved.

The invention relates to the field of edge calculation, and discloses a micro-nano unmanned aerial vehicle edge end data preprocessing system, which comprises a state space discretization mapping module used for collecting three-axis attitude data output by an inertial measurement unit, and quantitatively mapping the three-axis attitude data to a three-dimensional discrete coordinate system according to a preset angular resolution step length to generate an attitude grid index; the visual fingerprint extraction module is used for acquiring original image data and calculating a current global feature hash value; and the index arbitration logic control module is used for querying a preset background feature lookup table based on the attitude grid index, and generating a wake-up instruction to activate a rear-end depth reasoning unit when the Hamming distance between the current global feature hash value and the reference value is greater than a sudden change judgment threshold value. The coupling relation between the fuselage movement and the environment change is stripped, and low-power-consumption accurate awakening of the edge end under the dynamic non-stable working condition is achieved.

The invention discloses a rapid forward modeling method for a gravity field of a rectangular coordinate system based on an isoparametric transformation global discrete grid, and belongs to the technical field of geophysical exploration. According to the method, a measuring network composed of dggrid grids is manufactured to cover the whole measuring area range by selecting the measuring network forming form and the side length, the exploration depth is selected as D, the dggrid grids extend to the ground by an n < z + 1 > layer to form dggrid units of an n < z > layer, and the corresponding thickness of the dggrid units is D / n < z >. And calculating the abnormal response of all the dggrid units at each observation point by utilizing isoparametric transformation based on a dggrid unit interpolation type function, an integral point and an integral weight coefficient obtained by a hexagonal prism integral formula. Compared with a square grid, the dggrid grid has excellent angular resolution, the discrete distance measurement of the dggrid grid is better close to the Cartesian distance, and the dggrid grid also has the advantage of displaying uniform and clear adjacency. Compared with conventional direct calculation, the rectangular coordinate system gravitational field forward modeling based on the isoparametric transformation global discrete grid has extremely high acceleration potential.

The invention discloses a multi-mode adaptive weight SLAM method and system for a construction site. The method comprises the steps that a mapping model is established through sensor joint calibration, laser radar, camera and IMU data are synchronously collected through hardware, and dynamic filtering, distortion compensation and feature extraction are carried out on point clouds and images; the voxel entropy, the angular resolution and the feature density are calculated in real time to evaluate the degradation degree of each mode, and a visual residual error is dynamically adjusted by adopting an adaptive weight and frame skipping mechanism to ensure reasonable information injection in a degradation scene; iMU pre-integration, LiDAR point-surface residual errors and weighted visual reprojection residual errors are sequentially fused in an incremental Kalman sliding window frame, an automatic repositioning strategy is matched, and a high-precision pose and dense color point cloud map is output. According to the method, calibration, synchronization, degradation detection, sliding window optimization, map release and relocation are integrated, and the mapping precision and robustness can be remarkably improved under the complex working conditions of dust shielding, illumination variation, dynamic obstacles and the like.

The invention discloses a resolution-oriented 4D millimeter wave radar antenna array and physical layout collaborative optimization method, a program, equipment and a storage medium, which are suitable for a radar system with a limited space and a multi-chip structure. The method comprises the steps of firstly collecting system input parameters; then, an antenna design constraint model is constructed, spatial discretization is carried out, and an optimizable matrix model is formed; transmitting and receiving array structures in the azimuth angle direction and the pitch angle direction are jointly designed through a virtual array mapping strategy, so that the requirements of MIMO mapping efficiency maximization and target angle resolution are met. After an antenna structure is determined, an optimization objective function is further constructed based on strong constraint and soft constraint, and an antenna layout scheme which meets the manufacturing requirements and has optimal performance is obtained through a traversal and search method. According to the method, the virtual aperture can be effectively improved, the antenna number redundancy is reduced, the wiring accessibility is optimized, and the resolution and engineering realizability of a 4D radar system are enhanced.

The invention relates to a sensor unit (20) for detecting forces and their directions in the XY plane, comprising at least two sensors distributed on a mechanical measuring body (10). According to the invention, the at least two sensors are surface acoustic wave (SAW) sensors (24), wherein one or more milled grooves (22) are formed in the surface of the measuring body (10) for controlling the propagation of surface acoustic waves, and wherein the SAW sensors (24) are arranged on the measuring body (10) such that a precise determination of the direction and magnitude of the acting forces in the XY plane is enabled.

The application discloses an optical lens, which comprises, along an optical axis from an object side to an imaging surface, a first lens with negative focal power, the image side of which is a concave surface; a second lens with negative focal power; a third lens with positive focal power, the object side of which is a convex surface, and the image side of which is a concave surface; a fourth lens with positive focal power; a fifth lens with positive focal power, the object side of which is a convex surface, and the image side of which is a convex surface; a sixth lens with positive focal power, the object side of which is a convex surface; and a seventh lens with negative focal power. The optical lens adopts seven lenses, and through specific surface shape setting and reasonable focal power distribution, especially the first and second lenses adopting negative focal power, the optical lens can collect a large range of light, improve the field angle of the optical lens, and effectively improve the edge field proportion and the angle resolution of the edge field through setting the optical lens with large positive distortion.

The application discloses a radar high-resolution imaging method based on a fast shrinkage iterative threshold network, which is applied to the field of radar detection and imaging. The low-pass characteristic of a radar antenna pattern makes the deconvolution problem a pathological problem, the frequency band width of which is limited, and direct inverse filtering can cause high-frequency noise amplification and cannot obtain stable inversion results. The application combines the interpretability of an iterative algorithm and the advantages of deep learning, expands a fast iterative shrinkage threshold algorithm into a deep network, and can be used to solve the problems of low azimuth resolution of an existing scanning radar and difficulty in manually selecting parameters, so as to realize super-resolution imaging of the scanning radar. The application has the characteristics that two-dimensional radar data is divided into one-dimensional azimuth vectors, one-dimensional convolution is used to fully learn the characteristics of the azimuth data, the optimal parameters in the fast shrinkage threshold algorithm are obtained, and the azimuth resolution of the radar image is effectively improved.

This invention relates to an ophthalmic lens and its manufacturing process. The ophthalmic lens includes a lens body, which comprises a central region and an auxiliary region surrounding the central region. The auxiliary region contains a plurality of scattering clusters formed by translational shifts according to a preset period. Each scattering cluster is composed of multiple microstructures arranged according to a spatial lattice configuration. This invention, by first combining multiple microstructures into scattering clusters and then using these clusters to fill the auxiliary region, can, on the one hand, enhance the scattering of incident light in other directions, reducing the angular resolution of the luminescent object; on the other hand, it can ensure the uniformity of the entire scattering cluster by utilizing multiple microstructures arranged according to a spatial lattice configuration, further providing a basis for the optimization of myopia glasses.

The application discloses an optical lens, which comprises, in sequence from an object side to an imaging surface along an optical axis, a first lens with negative optical power, the object side of which is a convex surface and the image side of which is a concave surface; a second lens with negative optical power, the object side of which is a concave surface and the image side of which is a convex surface; a third lens with positive optical power; a fourth lens with positive optical power; a fifth lens with positive optical power; a sixth lens with positive optical power; and a seventh lens with negative optical power. The optical lens adopts seven lenses, and through specific surface shape setting and reasonable optical power distribution, especially the first and second lenses adopting negative optical power, the optical lens can collect a wide range of light, improve the field of view angle of the optical lens, and effectively improve the edge field of view ratio and the angle resolution of the edge field of view through setting the optical lens with large positive distortion.

The application provides a laser radar calibration parameter determination method and device, a storage medium and an electronic device. The laser radar calibration parameter determination method comprises the following steps: controlling a polygonal mirror to rotate at a preset rotating speed; adjusting the light-emitting time of pulse light emitted by a laser to a reflecting surface of the polygonal mirror; acquiring an image of a light spot generated by the reflecting surface reflecting the pulse light to a target plate; determining the light-emitting time of the pulse light corresponding to the target position of the light spot in the image as a first time corresponding to a first reflecting surface; calculating the time corresponding to other reflecting surfaces; adjusting the frequency of the pulse light emitted by the laser to match the preset rotating speed; capturing images of light spots generated by the reflecting surfaces reflecting the pulse light to the target plate; calculating the included angle between the light spots corresponding to the reflecting surfaces according to the positions of the light spots corresponding to the reflecting surfaces and the angular resolution of an image acquisition device; and determining the angle calibration value of the reflecting surfaces relative to the first reflecting surface according to the included angle. The embodiment of the application can improve the pointing accuracy of the laser radar light beam.

The purpose of the present disclosure is to reduce erroneous detection of a false image caused by sidelobes and also minimize the deterioration of angular resolution by appropriately using a window function when detecting a target using a radar.　A target angle detection device 2 comprises: an angle spectrum calculation unit 21 that performs digital beamforming on the same reception signal of a radar array antenna by using first and second window functions having different sidelobe suppression levels, and calculates first and second angle spectra, respectively; a differential spectrum calculation unit 22 that calculates a differential-intensity spectrum on the basis of the first and second angle spectra; and a target angle detection unit 23 that detects a target at a spectral angle where the spectral intensity lies within a predetermined range on the basis of the differential-intensity spectrum, and determines that what is detected is a false image rather than the target at spectral angles where the spectral intensity lies outside the predetermined range.

A light-emitting assembly, an optical system, and a LiDAR (100). The light-emitting assembly comprises a plurality of regions. Within a light emission cycle of the light-emitting assembly, in a first direction, a certain region among the plurality of regions comprises light-emitting regions and non-light-emitting regions that are continuously arranged, wherein an emission angle of irradiation from the light-emitting regions to an object space is less than the minimum angular resolution of a corresponding receiving assembly. The present application can be applied to intelligent vehicles or electric vehicles, and helps to realize super-resolution that exceeds the minimum angular resolution of the receiving assembly.

The present invention provides a method for inspecting angular resolution of a LiDAR device, comprising the steps of: preparing and arranging a LiDAR device to be inspected and a target; rotating, for each rotation step, the LiDAR device to be inspected, and allowing the LiDAR device to be inspected to record at least one frame in each rotation step, and calculate a point cloud on the basis of the recorded frame; selecting a plurality of data points in the calculated point cloud; acquiring intensity data in at least a part of the rotation steps for each of the selected data points; and determining, on the basis of the acquired intensity data and rotation angles in the rotation step at which the intensity data is acquired, angular resolution of the LiDAR device to be inspected, wherein the target includes a first portion and a second portion, and the reflectivity of each of the first portion and the second portion is different.

The invention discloses an optical lens and a laser radar. The maximum full field angle of the optical lens is within the range of 8-35 degrees, and the angular resolution value AR05 of any position of the half field angle of the optical lens within the range of 0-5 degrees and the angular resolution value ARS of the maximum half field angle of the optical lens meet the condition that AR05 is smaller than or equal to 86.2% ARS.

The present invention provides a method for inspecting the angular resolution of a LiDAR device, comprising the steps of: preparing a LiDAR device to be inspected and at least one target; rotating, in N steps, the LiDAR device to be inspected, in the azimuth direction or altitude direction, and recording, at each rotation angle of the N steps, a plurality of frames for the target through the LiDAR device to be inspected; selecting, from the frames, at least one data point among data points calculated by the LiDAR device to be inspected; and determining, on the basis of the selected data point, the angular resolution of the LiDAR device to be inspected.

The application provides an optical lens and an electronic device. The optical lens comprises: a first lens, the first lens having negative optical power, a first side of the first lens being a convex surface, and a second side of the first lens being a concave surface; a second lens, the second lens having positive optical power, a first side of the second lens being a convex surface, and a second side of the second lens being a convex surface; a third lens, the third lens having negative optical power, a second side of the third lens being a concave surface; a fourth lens, the fourth lens having positive optical power, a first side of the fourth lens being a convex surface, and a second side of the fourth lens being a convex surface; a fifth lens, the fifth lens having positive optical power, a first side of the fifth lens being a convex surface; and a sixth lens, the sixth lens having positive optical power, a first side of the sixth lens being a convex surface. The application solves at least one of the problems of low relative luminance, poor resolving power, strong ghost image and small angular resolution in the prior art.

The invention discloses a digital holographic lithography method based on light source phase coding and binary mask collaborative optimization, which comprises the following steps: 1, applying preset light source phase coding to an incident light field, and carrying out collaborative modulation with a binary amplitude mask to obtain a mask transmission light field; 2, propagating the transmission light field to a wafer plane by adopting an angular spectrum propagation model to obtain a wafer surface reproduction light field; 3, constructing a joint optimization function of the wafer surface light field intensity and a target graph, and carrying out collaborative optimization on a light source phase encoding parameter and a mask binarization structure parameter; and 4, performing holographic photoetching exposure and development based on an optimization result, and forming a high-resolution angular interference pitch line pattern on the surface of the wafer. By means of light source-mask collaborative coding, a traditional complex three-dimensional mask is simplified into a binary amplitude mask, the mask machining difficulty and manufacturing cost are reduced, meanwhile, the wafer surface angular resolution is effectively improved, and a feasible technical scheme is provided for a high-bandwidth digital holographic photoetching system.

The invention discloses a flight device and an image construction method and device.The flight device comprises a first camera module which is arranged at the lower end of the flight device and used for collecting a first image, and the first image comprises a flight device lower image which is shot by the first camera module and comprises ground scenery; the second camera module is arranged at the upper end of the flight equipment and used for collecting a second image, the second image comprises an image, which is shot by the second camera module and comprises sky scenery, above the flight equipment, the first image and the second image are spliced to obtain a third image, and the third image is a panoramic image; wherein the first camera module has a first angular resolution, the second camera module has a second angular resolution, and the first angular resolution is different from the second angular resolution.

The present disclosure provides an optical waveguide device used in a laser detection and ranging system (lidar). The optical waveguide device includes: a waveguide inlet configured to receive a first light signal; a waveguide body configured to guide the first light signal to transmit in the optical waveguide device; and a waveguide outlet configured to output a second light signal exited after the first light signal is guided; a ratio of the area of the waveguide inlet to that of the waveguide outlet is greater than a first preset ratio, and transmission efficiencies of the optical waveguide device in first and second directions are different, the transmission efficiency in the first direction is greater than a first threshold, the transmission efficiency in the second direction is less than a second threshold. With this optical waveguide device, effects of long measurement distance, high angular resolution and small volume can be achieved.

The application provides a fast MUSIC method for enhancing radar angle resolution, comprising the following steps: step one, establishing an array model equivalent to a radar antenna, and then calculating the distance and direction between each antenna in the array; step two, constructing a spatial spectrum function, and estimating the parameters of a signal through a spectrum peak search; step three, setting one transmitting array element, transmitting chrip signals in one frame, and then the signal received by a single receiving array element in one frame is, and point sampling is conducted on the received signal to obtain the maximum likelihood estimation of a finite-length data covariance matrix. The technical scheme can effectively accelerate the estimation speed of the arrival angle of a target, and can be applied to actual point cloud acquisition.

The invention relates to an MRAM (Magnetic Random Access Memory) detection method of an objective lens integrating optical angle resolution and a high numerical aperture, and belongs to the technical field of memory detection. The method comprises the following steps: (1) system preparation; (2) sample preparation; (3) optical angle resolution observation; (4) collecting optical signals; (5) optical detector and signal processing; and (6) result analysis and evaluation. According to the invention, an optical angle resolution technology is utilized, and an objective lens system with a high numerical aperture is combined, so that high-resolution observation and analysis of the MRAM unit can be realized, and information such as a microstructure, a magnetization state and magnetic characteristics of the MRAM unit can be obtained by using a proper optical detector and a signal processing technology.

The application discloses an optical lens, which comprises, along an optical axis from an object side to an imaging surface, a first lens with negative focal power, the object side of which is a convex surface and the image side is a concave surface; a second lens with negative focal power, the object side of which is a concave surface; a third lens with positive focal power, the image side of which is a convex surface; a fourth lens with positive focal power; a fifth lens with positive focal power, the object side of which is a concave surface and the image side is a convex surface; a sixth lens with positive focal power, the object side of which is a convex surface and the image side is a convex surface; and a seventh lens with negative focal power, the object side of which is a concave surface. The optical lens adopts seven lenses, through specific surface shape setting and reasonable focal power distribution, especially the first and second lenses with negative focal power, so that the optical lens can collect a wide range of light, improve the field of view angle of the optical lens, and effectively improve the edge field of view ratio and the angle resolution of the edge field of view through setting the optical lens with large positive distortion.

The invention relates to a multi-degree-of-freedom optical path focusing mechanism and a low-temperature sample stage, and relates to the technical field of ultrahigh vacuum experiment equipment, and the multi-degree-of-freedom optical path focusing mechanism comprises a base module which is of an integrated plate-shaped structure; the sample seat control module can realize linkage control of a sample seat on three translational degrees of freedom of x, y and z and a polar angle rotational degree of freedom; the sample seat supporting module is used for supporting a sample seat in a sample transferring or changing process; the ellipsoidal mirror control module can realize control of the ellipsoidal mirror on three translational degrees of freedom of x, y and z and two rotational degrees of freedom of a tilt angle and a polar angle; wherein the sample seat control module and the ellipsoidal mirror control module are spatially arranged in parallel. According to the invention, the focusing light wave band range can be expanded, the light spot stability can be improved, the worm and gear driven sample table top interior angle rotation function is integrated, and the requirements of advanced condensed state physical research on broadband, high flux and high precision angle resolution photoelectron spectroscopy experiments are met.

This application provides an optical lens and a lidar, relating to the field of radar technology. The optical lens provided in this application comprises, along the optical axis from the object side to the image side, a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power, and a fifth lens with negative optical power. The total optical length (TTL) of the optical lens and the overall focal length (f) satisfy: 1.3 < TTL / f < 1.8. By optimizing the shape of each lens and rationally allocating the optical power of each lens and the ratio of the total optical length to the overall focal length, this application enables the optical lens to have a smaller FNO and a smaller CRA, achieving a higher incident light quantity in a smaller volume, thereby increasing the lidar's range, improving its resistance to ambient light, and also improving angular resolution consistency and reducing distortion. The lidar including the above-described optical lens possesses superior performance and is easily implemented in a small volume with a long range.

An antenna array, transceiver, radar, and terminal are disclosed, applicable to the field of detection technology. The antenna array includes M receiving antennas and N transmitting antennas. The M receiving antennas are arranged in a non-uniform row. Of the N transmitting antennas, L are arranged in the same row, and H of these transmitting antennas are positioned differently along the column direction. Furthermore, at least one additional transmitting antenna is provided outside the L transmitting antennas, spaced from the L transmitting antennas in the same row along the column direction by a first value, where the first value falls within the range [0.5λ, 1λ]. The antenna array arrangement design of this embodiment significantly improves the angular resolution of the antenna array in both azimuth and elevation dimensions, and provides a large field of view in both directions, as well as high sidelobe suppression. This application also provides a transceiver, radar, and terminal incorporating this antenna array.

According to the large-view-field and high-precision space debris wide-area detection optical system provided by the invention, the afocal optical system adopts a total reflection form, so that a relatively large aperture can be realized, and the detection capability and the angular resolution of the system are improved; in addition, the large-view-field optical system adopts a transmission form, so that a large view field can be realized, and the system efficiency is improved; moreover, when the system works in a large view field mode, the view field angle can reach more than 20 degrees, the monitoring efficiency can be improved, when the system works in a large aperture mode, the entrance pupil diameter can reach more than 300 mm, and tiny space debris can be monitored, so that the monitoring precision is improved. Meanwhile, the whole system adopts a set of detector system, so that the cost and the weight of the optical system are reduced.

An apparatus and method are provided for determining the angular resolution of a radar (111). The apparatus includes: a first corner reflector (103a) and a second corner reflector (103b) for reflecting electromagnetic waves from the radar along a reflection direction toward the radar; a first motor (105a) for adjusting the first corner reflector and / or the second corner reflector to change a first distance between the first corner reflector and the second corner reflector in a direction of movement perpendicular to the reflection direction; a second motor (105b) for adjusting the first corner reflector and / or the second corner reflector to change a second distance between the first corner reflector and the second corner reflector in a direction of movement along the reflection direction; and a controller (101) for receiving reflection measurements of a plurality of first distances and / or a plurality of second distances from the radar and determining the angular resolution of the radar based on the reflection measurements.