555 results about "Scan angle" patented technology

The invention relates to a steel truss girder digital pre-assembly method and system based on three-dimensional laser scanning, and belongs to the technical field of constructional engineering. The method comprises the following steps: calculating a three-dimensional coordinate and a scanning angle of a scanning observation station based on a steel truss girder design model and field environment point cloud data to obtain observation station layout position parameters; controlling a three-dimensional laser scanner to scan the steel truss girder section by section according to the arrangement position parameters of the observation station, and acquiring original point cloud data of each section of the steel truss girder; performing spatial alignment and noise reduction processing on the original point cloud data to obtain standardized point cloud data; based on the standardized point cloud data, feature parameters of all the segments are segmented and extracted, digital splicing is carried out, and a steel truss girder three-dimensional point cloud model is generated; based on the steel truss girder design model and the steel truss girder three-dimensional point cloud model, the displacement deviation value and the angle deviation value between the segments are calculated, and an assembly error result is obtained; and generating a construction correction parameter set based on the assembly error result. The assembling precision of the steel truss girder can be improved.

The invention belongs to the technical field of three-dimensional imaging and measurement, and particularly discloses a laser scanning three-dimensional imaging method and device, a medium and equipment, and the method comprises the steps: obtaining laser scanning data of a target object, and the laser scanning data comprises depth data including reflection intensity, a scanning angle, a timestamp and flight time; preprocessing the laser scanning data, and fusing a time sequence and scanning path information to obtain multi-channel input features adaptive to a neural network; constructing a three-dimensional geometric reconstruction model, and training the model; inputting the multi-channel input features into a trained three-dimensional geometric reconstruction model to obtain a dual-channel output tensor containing a dense depth map of the target object and a corresponding uncertainty map; converting the dual-channel output tensor comprising the dense depth map of the target object and the corresponding uncertainty map into a three-dimensional point cloud under world coordinates; and post-processing the three-dimensional point cloud to obtain a three-dimensional image of the target object.

The invention relates to the technical field of new energy power plant construction data processing, in particular to a construction site personnel track recognition system based on a two-dimensional code, which adopts laser etching to dynamically encrypt a two-dimensional code label, and improves the weather resistance of the label in a salt fog environment through a salt-dredging nano coating and antistatic packaging. And a double-fixing structure combining the elastic binding band and the magnetic fastener is suitable for high-strength operation scenes. Industrial-grade scanning base stations are deployed in a construction area in a gridding mode, three-dimensional coordinate data are captured through a multi-base-station cooperative scanning mechanism, high-reflection interference of photovoltaic panels is eliminated through a signal intensity difference algorithm, and a de-noising coordinate set is generated. The closed-loop calibration module corrects scanning angle offset and earth surface reflection weight parameters through a three-level check link, the environment adaptation module triggers an ultrasonic multi-frequency cleaning program to maintain optical performance, and the cooperative control unit adjusts the light supplementing intensity and the data fusion proportion in a linkage mode. Accurate identification of personnel tracks and multi-working-plane dynamic management and control in a complex environment are realized.

The invention discloses an array antenna phase-only real-time beam scanning and side lobe control method based on machine learning. Firstly, array geometry, scanning angles and minor lobe indexes are set; and then, array element excitation phases meeting requirements are rapidly synthesized by using a phase-only fast Fourier FFT (Fast Fourier Transform) algorithm. Constructing a training data set by taking the scanning angle and the minor lobe index as input and the corresponding phase distribution as output; training a neural network by using the data set to obtain a real-time prediction model from initial excitation distribution to accurate excitation distribution; and according to a target expected directional diagram scanning angle and a sidelobe feature, inputting the scanning angle and the sidelobe feature into a neural network to predict and obtain an array element excitation phase so as to realize a real-time phase-only beam and sidelobe control function. Input dimensions are reduced by extracting key features of a directional diagram, data generation is accelerated by means of FFT, real-time performance and precision are both considered, and the method is suitable for fast beam scheduling tasks of various array antennas.

The invention belongs to the technical field of antenna engineering, and particularly relates to an ultra-wide-band low-profile phased-array antenna, which realizes broadband impedance matching characteristics and effectively expands the working bandwidth of the antenna by optimizing a dipole arm structure and introducing a matching branch knot and linear tapered slot composite structure on a radiation unit layer; on the array architecture level, an electromagnetic metasurface technology is adopted, array current distribution is improved through a periodic artificial electromagnetic structure, the active standing-wave ratio is remarkably reduced, the scanning angle of an array is widened, and meanwhile high compression of a system profile is achieved; on the structural design level, a three-dimensional composite structure of a transverse metal floor, a longitudinal radiation layer and a transverse metasurface layer is innovatively constructed, and the overall section height is reduced to 0.137 lambda Low (lambda Low is the lowest working frequency wavelength) through electromagnetic coupling and space folding technologies; in conclusion, the ultra wide band (the relative bandwidth is greater than or equal to 90%) and the low profile (lt; and the method is suitable for a new generation of broadband phased array radar system.

Disclosed are a wide-angle beam-scanning phased array based on near-field coupling and port self-decoupling and a design method thereof. This design method is different from traditional methods that require introduction of additional beam-broadening and decoupling structures, but aims to obtain wide-beam active element pattern by cleverly utilizing a near-field coupling effect between elements. Meanwhile, port self-decoupling technology is introduced into the phased array to achieve high port isolation and improve beam gain at large scanning angle. Therefore, a phased array with an extremely simple structure and an excellent beam-scanning performance, can be constructed based on typical narrow-beam antenna elements, without requiring additional beam broadening and decoupling structures.

The invention belongs to the field of synthetic aperture radars, and discloses a high-orbit SAR sliding bunching working mode design method and system. The method comprises the steps that 1, resolution improvement factors of a high-orbit SAR in different orbit satellites are calculated; 2, according to resolution improvement factors of the high-orbit SAR in different orbit satellites, calculating a sliding speed of a sliding bunching mode antenna beam on the ground; 3, calculating the antenna beam angle scanning speed according to the sliding speed of the antenna beam in the sliding bunching mode on the ground; and 4, calculating the scanning angle of the antenna beam according to the observation breadth required by the azimuth. According to the method, the problem that a traditional sliding bunching working mode design and calculation method of the high-orbit SAR fails is solved, the influence of satellite speed time varying and earth rotation on the sliding bunching working mode design of the high-orbit SAR is considered, the precision of the working mode design of an SAR system can be greatly improved, and the method has important application prospects.

A VTOL UAV comprising a chassis, a propulsion system mounted on the chassis, electronics including a flight control system, and a 3D LIDAR sensor mounted on the chassis. The 3D LIDAR sensor has a laser beam 360° rotation axis (R) and an azimuthal scanning angle (α) in a range of 70° to 110°. The propulsion system comprises a plurality of propellers with motors configured for flight without wings, including static hovering flight, the VTOL UAV comprising a yaw axis (Z) about which it can rotate upon itself. The 3D LIDAR sensor is statically mounted on the chassis such that the LIDAR laser beam 360° rotation axis (R) is inclined at a LIDAR inclination angle (β) with respect to the yaw axis (Z) in a range of 35° to 50°.

The invention discloses an indoor toxic and harmful gas three-dimensional imaging and tracing method and equipment, and the method comprises the steps: placing remote measurement instruments based on a laser detection principle at different corners in a room, obtaining the remote measurement data of each space layer at different scanning angles, and positioning a gas concentration high-value region; dense point locations are arranged in a gas concentration high-value area of each spatial layer, an in-situ measurement instrument based on a spectrum detection principle is utilized to measure and obtain in-situ data on the point locations, and meanwhile, extremely-high-resolution poisonous and harmful gas accurate traceability is realized; the two-dimensional distribution of the gas concentration of each space layer is obtained through remote measurement and in-situ data reconstruction, and is further mapped to a three-dimensional space to realize three-dimensional imaging and gas traceability. A wide-area light beam scattering gas telemetering instrument and a multi-pass reflection ultra-sensitive gas in-situ measuring instrument are autonomously designed, so that full-space rapid three-dimensional imaging and accurate traceability can be realized, system errors are reduced, an extremely low detection limit is achieved, and the feasibility, accuracy and high efficiency of the method are ensured.

The present invention relates to the field of high-rate mobile wireless communications. Disclosed are a multi-frequency multi-polarized wide-beam scanning base station system, and an optimization design method. The method comprises: on the basis of an aperture field expansion theory and a mode coupling theory, designing a conical horn feed source antenna capable of radiating a Gaussian fundamental mode beam, and providing a stable beam width and a stable phase center; designing a beam separation device based on a periodic structure, wherein the beam separation device includes band-pass frequency selective surfaces and a linear polarization grid; and combining front-end quasi-optical links of multiple frequency channels and multiple polarized channels, so as to increase the bandwidth and communication rate of a base station antenna. In the present invention, a genetic optimization algorithm is combined with reflector shaping, thereby effectively reducing the conflict between a shielding effect of a dual-reflector antenna and a scanning angle, and realizing the multiplication of a beam scanning angle.

An apparatus for performing laser cutting and collection of a target micro-region of a tissue section on a blade. The apparatus comprises a carrier stage, a blade, a laser cutting system, a control module and a collector, wherein the laser cutting system comprises a laser device, a beam expander, a galvanometer scanner and an objective lens; and by means of adjusting a scanning angle θ of the galvanometer scanner and combining same with the objective lens, a scanned laser is focused to realize the cutting of a target micro-region on a tissue section and the ejection of the target micro-region. Laser microdissection is combined with mechanical sectioning, and non-contact collection of a specific micro-region of a tissue section placed on an inclined blade is achieved under the action of laser edge ejection combined with a dielectrophoretic force, such that the integrity of the morphology of a sample throughout an acquisition process is ensured, three-dimensional positional information of a target cell or cell population is accurately reserved, the cutting efficiency is improved, and non-contact cutting can also be realized to prevent the sample from being contaminated.

The invention provides an MEMS (Micro Electro Mechanical System) micromirror array chip, a module and optical scanning equipment. The MEMS micromirror array chip comprises a plurality of micromirror structures, a substrate, a vertical lead structure and a capacitance angle sensing structure, according to the micro-mirror array chip integrated with the capacitive sensor, array-level real-time angle detection, feedback control and high-precision scanning angle detection are realized, and the micro-mirror array chip is fast in driving and resistant to interference; meanwhile, the wiring density is reduced by frequency division multiplexing isolation signals; in addition, the application of a monolithic integrated capacitance angle sensor in a high-density micro-mirror array chip is realized by a thick substrate with a silicon through hole; and finally, the micromirror array chip of the monolithic integrated capacitance angle sensor is used for precision optical scanning equipment, a photoelectric angle detector is omitted, optical scanning high-precision real-time angle detection and feedback control, high-precision angle detection and high-speed scanning are realized, the use design is convenient, and the cost is low.

The invention discloses a circularly polarized wide-angle scanning phased-array antenna, which comprises a plurality of quaternary sub-arrays, each quaternary sub-array comprises four antenna units, the feed phases of the four antenna units are sequentially subjected to 90-degree phase compensation to form the quaternary sub-array, and the plurality of quaternary sub-arrays are sequentially combined to form the phased-array antenna. A metamaterial wide-scanning matching structure is loaded above an antenna array plane, a double-layer structure is adopted, correction is improved through phase compensation, the phased-array antenna has the large-angle scanning capacity of + / -70 degrees, and the axial ratio at the center frequency point 29.5 GHz and at each scanning angle is smaller than 1.5 dB. The invention provides the circularly polarized wide-angle scanning phased-array antenna, the phased-array antenna has the large-angle scanning capability of + / -70 degrees, the axial ratio in the scanning range is within 3dB, and the circularly polarized standard can still be met.

The invention relates to the technical field of surveying and mapping remote sensing, and discloses a sparse airborne laser radar data single tree identification method based on a Transform network, and the method comprises the following steps: S1, collecting airborne laser radar point cloud data of a forest; s2, preprocessing the laser point cloud data to obtain a single tree instance point cloud data sample; and S3, constructing a double-branch Transform network, training the model by using the training set, selecting an optimal model, and testing. According to the method, a Transformer model of a double-branch structure is designed to process geometric information corresponding to three-dimensional coordinate information of point cloud data and other attribute information such as a scanning angle, an echo number and echo intensity so as to obtain a high-precision classification result.

A half-spectrum search DOA estimation method based on characteristic value gradient jump belongs to the field of array signal processing, and comprises the following steps: modeling a received signal to obtain an array output vector; calculating a received signal covariance matrix; introducing a complex conjugate covariance matrix and a scanning source to construct a new covariance matrix, and constructing a spatial spectrum function; constructing a characteristic value gradient discrimination function, and adaptively estimating a signal source number by using the characteristic value gradient discrimination function; scanning angles are traversed by using a half-spectrum search method, and a signal direction of arrival is verified and determined by combining an MVDR algorithm according to a sharp spectrum peak formed by a spatial spectrum function. According to the method, source number priori knowledge is not needed, the source number can be identified autonomously, the problem that estimation is inaccurate under complex conditions in traditional half-spectrum search is solved, and the method has good robustness under the scene of unknown source number. According to the method, the limitation that few traditional half-spectrum search angle estimation is inaccurate is overcome, and a new thought is provided for half-spectrum search DOA estimation under the condition that the number of information sources is unknown.

The present disclosure is related to improving image quality in a scanning camera system via scan angle selection to obtain images having overlap for performing image stitching, dynamically tuning an aperture of a camera in the scanning camera system, updating pixel values of an image using vignetting data, or a combination thereof.

The invention relates to the technical field of gas leakage detection and optical remote sensing, particularly discloses a laser natural gas leakage point positioning and imaging processing method based on an unmanned aerial vehicle, and aims to solve the problems of multiple coverage blind areas, low positioning precision and easiness in environmental interference in the prior art. The method comprises the following steps: acquiring a methane concentration integral value through a tunable diode laser absorption spectrum system carried by an unmanned aerial vehicle; constructing an initial concentration point cloud in combination with the high-precision pose and scanning angle data; performing space-time filtering and interpolation enhancement by adopting Kalman filtering and a Gaussian plume model to generate a high-confidence three-dimensional concentration field; and accurately positioning a leakage source by using a gradient rising tracking algorithm in combination with curvature and continuity constraints, and matching pipe network geographic information to perform verification alarm. According to the technical scheme, large-range, high-precision and full-automatic natural gas leakage detection and visual positioning are realized, and the signal-to-noise ratio, the anti-interference capability and the response efficiency are remarkably improved.

The present disclosure is related to improving image quality in a scanning camera system via scan angle selection to obtain images having overlap for performing image stitching, dynamically tuning an aperture of a camera in the scanning camera system, updating pixel values of an image using vignetting data, or a combination thereof.

The invention discloses a self-adaptive wave position design method for a high-orbit SAR (Synthetic Aperture Radar). The self-adaptive wave position design method comprises the following steps: step 1, determining an imaging mode, a wave position, a polarization mode, a satellite position at a current orbit moment, a satellite attitude, an antenna installation azimuth angle, an antenna installation pitch angle and an antenna imaging wave position scanning angle; step 2, according to the imaging mode, determining a transmitting pulse width, and setting a maximum duty ratio and a minimum duty ratio; 3, determining the maximum available PRF, the image fuzziness and the system sensitivity at the current orbit moment according to the maximum duty ratio and the minimum duty ratio; 4, determining whether to update the PRF according to the image ambiguity and the system sensitivity; step 5, calculating to obtain radar echo starting time and echo window length; and step 6, returning to the step 1 at the moment of entering the next track. According to the method, different PRFs can be adaptively selected according to different track positions, so that adaptive adjustment of radar parameters is realized.

The invention provides a rapid three-dimensional ultrasonic imaging system, imaging method and device. The rapid three-dimensional ultrasonic imaging system comprises an ultrasonic transduction unit group arranged in a bearing body; the ultrasonic transduction units in the ultrasonic transduction unit group are arranged in a twisted manner, so that the ultrasonic transduction units are arranged in a staggered manner along a set direction to obtain a larger scanning range; the control end sends out a working instruction, and at least two ultrasonic transduction units in the ultrasonic transduction unit group are periodically selected to scan the target area; in any period of scanning the target area by the ultrasonic transduction unit, adjusting the scanning angle of the ultrasonic transduction unit at least twice to obtain local image data; the control end acquires local image data, performs data interaction with the reconstruction end in a parallel / serial mode, and is used for quickly acquiring a three-dimensional ultrasonic image for a target area; the three-dimensional imaging system is smaller in data volume, shorter in imaging time and higher in efficiency.

The present disclosure is directed to a camera configured to capture a set of oblique images along a scan path on an object area; a scanning mirror structure including at least one surface for receiving light from the object area, the at least one surface having at least one first mirror portion at least one second portion comprised of low reflective material arranged around a periphery of the first mirror portion, the low reflective material being less reflective than the first mirror portion; and a drive coupled to the scanning mirror structure and configured to rotate the scanning mirror structure about a rotation axis based on a scan angle. The at least one second portion can be configured to block light that would pass around the first mirror portion and be received by the camera at scan angles beyond the set of scan angles.

The invention discloses a phased array radar sparse super-resolution imaging method based on antenna pattern correction, which comprises the following steps of: firstly, combining Doppler phase information under a motion platform to construct a reconvolution model of a phased array radar, then dynamically adjusting the number of sampling points of an antenna pattern according to a scanning angle, and correcting an antenna pattern matrix; and finally, based on a covariance criterion, proposing a weighted sparse iteration solution framework, and realizing sparse target reconstruction. According to the method, the scanning process of the phased array radar is accurately represented by correcting an antenna pattern matrix, and a weighted sparse iteration solving framework based on a covariance fitting criterion is provided to realize sparse target reconstruction under the condition of low signal-to-noise ratio. The problems of model mismatch caused by broadening of an antenna pattern along with a scanning angle in the electronic scanning process of the phased array radar and imaging distortion caused by Doppler phase errors of a high-speed motion platform are solved.

The invention relates to the technical field of photovoltaic power generation equipment, and particularly discloses a photovoltaic panel fault inspection device for a solar photovoltaic power station, which comprises a rack and an infrared scanner, the upper side of the rack is provided with a toothed plate for supporting the infrared scanner, and the lower side of the rack is provided with a driving assembly. The driving assembly is used for driving the rack to linearly move along the surface of the photovoltaic panel, an adjusting assembly is arranged between the toothed plate and the rack, the adjusting assembly comprises lug plates fixedly connected with the outer surface of the upper end of the rack, and a driven shaft is rotationally connected between the two sets of lug plates. By arranging the adjusting assembly, the supporting pipe drives the toothed plate and the infrared scanner to turn over with the driven shaft as the fulcrum, so that the scanning angle of the infrared scanner is adjusted, the angle between the infrared scanner and the photovoltaic panel can be maintained within a proper range, the detection precision of the photovoltaic panel can be effectively improved, and the detection efficiency of the photovoltaic panel is improved. And meanwhile, the application range of the inspection device can be effectively expanded.

A hybrid scanning antenna including: a reflector having a focal line; a first mechanical movement to move the reflector about a first axis; a second mechanical movement to move the reflector about a second axis; a linear array fixedly disposed along the focal line to electronically scan at a scan angle about a third axis; and a controller to control the first mechanical movement, the second mechanical movement and the scan angle of the linear array to orient the hybrid scanning antenna to a look angle of a remote transceiver.

The invention belongs to the technical field of ocean remote sensing, and particularly discloses a shore wave parameter extraction method and a shore wave height prediction method based on an airborne static laser radar. The problem that when a static laser radar scanner is used for scanning dynamic clapping shore waves, the periodic evolution form of the sea waves cannot be obtained is effectively solved. The parameter extraction method comprises the steps that an unmanned aerial vehicle is used for carrying a static laser radar scanner to collect data, the data are exported to be in a txt format, and geographic coordinates of point cloud, a scanning angle between a laser radar scanning beam and the direction perpendicular to the ground and relative time are obtained; sequencing the required data according to relative time, and slitting the sequenced data into a plurality of new txt files according to a self-defined time interval; extracting a wave beam from the txt file; de-noising and visualizing the data; and sea wave parameter extraction and environmental influence factor acquisition. According to the method, the beamwave beam state data of the self-defined time interval can be accurately captured, and the refined beamwave parameters can be effectively extracted.

The invention relates to the technical field of robots, in particular to a cleaning robot operation intelligent monitoring control system and method, and the system comprises a map building and positioning module, a path planning module, an obstacle detection module, an obstacle analysis module, a static obstacle avoidance module, a dynamic obstacle avoidance module, a path modification module, and a management database. The system constructs an environment map by acquiring an environment image around the cleaning robot, plans an optimal advancing path of the cleaning robot according to each fixed task point position of a cleaning task, judges whether an object at each scanning angle is an obstacle according to each time point position coordinate of the object at each scanning angle, and classifies each obstacle. According to the method and the system, the cleaning robot is used for carrying out obstacle avoidance on various types of obstacles, the obstacles are updated into an environment map according to the obstacle avoidance times of the cleaning robot on the static obstacles, and the optimal advancing path of the cleaning robot is periodically updated, so that tasks can be smoothly completed under various conditions without being obstructed.

The invention relates to the field of nanometer materials, in particular to a 2D-TMDs transverse heterojunction array and a Zigzag M / X end induction preparation method and application thereof, and the preparation method comprises the steps that a single crystal nanosheet of an A material is obtained, the A material is MX2, and M is W or Mo; x is S or Se; laser confocal etching treatment is conducted on the single crystal nanosheet, and the scanning angle of the laser confocal etching treatment ranges from 10 degrees to 50 degrees; carrying out micro-cavity thermal etching on the single crystal nanosheet with the arraying point defects; preparing a banded array with zigzag M / X atom alternating ending edges; and depositing a B material by taking the prepared strip array as a deposition template, and enabling the B material to laterally and epitaxially grow along the edge of the strip array to prepare the A-B lateral heterojunction array of the specific heterogeneous interface. According to the Zigzag M / X end induction preparation method disclosed by the invention, a better two-dimensional material interface and structure can be obtained, and better performance can be shown.

The invention relates to the technical field of micro galvanometers, and discloses an electrostatic drive micro galvanometer and a preparation method thereof. The electrostatic driving micro galvanometer comprises a first functional structure layer, a second functional structure layer and a third functional structure layer which are sequentially stacked and are in insulated connection; the first functional structure layer comprises a first accommodating space, a first driving structure and a second driving structure; the second functional structure layer comprises a torsional reflector assembly suspended above the first accommodating space, and the reflecting surface of the torsional reflector assembly deviates from the first functional structure layer; the third driving structure of the third functional structure layer corresponds to the first driving structure, the fourth driving structure corresponds to the second driving structure, and the second accommodating space corresponds to the first accommodating space. A sandwich type structure is adopted, the first functional structure layer and the third functional structure layer which are provided with fixed driving structures are arranged on the upper side and the lower side of the second functional structure layer provided with the movable torsional reflector assembly respectively, the scanning angle of the micro galvanometer is increased, and interference of unbalanced motion is avoided.

The invention discloses a miniature optical scanning device and an electromagnetic driving optical scanning device, the optical scanning device comprises a reflecting mirror, an elastic sheet, a gasket and a permanent magnet, the reflecting mirror is a sheet-shaped element used for reflecting light or changing the light beam propagation direction; the gasket is fixed on the back surface of the reflecting mirror; the elastic sheet comprises a fixed part, an elastic working part and a connecting part, and the connecting part is fixed on the gasket; the fixing part of the elastic sheet is used for being fixedly connected with an external carrier; the elastic working part comprises an elastic structure which can be bent and deformed or bent and deformed, and the reflecting mirror can be driven to rotate back and forth or vibrate around a rotating shaft through bending deformation or bending deformation of the elastic working part; the permanent magnet is fixed on the back surface of the reflecting mirror and is nested in the connecting part of the elastic sheet and the gasket; the internal stress can be effectively reduced, the scanning angle is increased, the service life problem of a product is solved, and the product cost is reduced.

The invention provides a synthetic aperture radar imaging method and device based on adaptive digital beam forming, which can be applied to the technical field of radars. The method comprises the following steps: transmitting a transmitting signal to a wide scene by using an array antenna; acquiring a lower view angle and a side view direction of the synthetic aperture radar, a mounting angle of an array antenna, and a course angle, a pitch angle, a roll angle and position information of the movable equipment; according to the lower view angle, the side view direction, the course angle and the pitch angle, calculating to obtain a squint angle of the mobile equipment; according to the squint angle, a preset sampling point number, the position information and sampling delay, an initial pitch direction intra-pulse scanning angle is determined, and the sampling delay represents time delay between sending of the emission signal and starting of receiving of an echo signal corresponding to the emission signal; according to the initial pitching direction intra-pulse scanning angle, the roll angle and the installation angle, calculating to obtain a target pitching direction intra-pulse scanning weight; and obtaining a target image of the target area according to the target pitching intra-pulse scanning weight.