485 results about "Beam scanning" patented technology

The technology described herein is directed towards a transceiver with beam scanning capability based on leaky wave antenna technology and substrate integrated waveguide technology, along with a metallic covering that determines which direction the antenna radiates signals. The leaky wave antenna can include different respective groups of slot pairs having different respective periodicities, corresponding to different respective beam steering directions. One or more metallic covers can be used to cover some of the slot pair sections, such that the sections under cover behave like a conventional substrate integrated waveguide and the exposed section(s) behave like conventional leaky wave antennas. The metallic covers can be moved as desired, such as attached via magnets. The transceiver can thus steer signals to a wearable or portable device that includes a passive metasurface while mitigating null regions. The slot pairs can be asymmetrical reflection-canceling slot pairs, to achieve broadside radiation while avoiding band-stop effects.

The invention provides a light beam scanning device of an integrated photonics chip and a test method. The light beam scanning device of the integrated photonics chip comprises a chip sample table, a chip sample table base, a light beam receiver connected with a lens cone and a horizontally arranged turntable base, the lens barrel is arranged above the turntable base, and a diaphragm adjusting structure and at least four lens groups are arranged in the lens barrel; the central point of the chip sample table base is overlapped with the central point of the turntable base, the chip sample table base is positioned above the turntable base, and the chip sample table is vertically arranged at the central point of the chip sample table base. Through switching of different lens groups in the lens cone, measurement of far and near fields of the to-be-tested chip is realized by using the same lens cone, the lens cone is arranged on the turntable base, and the test angle range can be adjusted according to specific test requirements so that various chip test requirements can be met.

The invention discloses a low-profile dual-circularly polarized wave beam scanning folding reflection array antenna. The low-profile dual-circularly polarized wave beam scanning folding reflective array antenna comprises a lower reflective array antenna and an upper circularly polarized selection metasurface. A circular polarization plane feed source is integrated in the middle of the reflective array antenna, and beam deflection is achieved. The circular polarization selection metasurface introduces opposite phase gradients to a left-hand circular polarization wave beam and a right-hand circular polarization wave beam through spin decoupling, and then introduces opposite wave beam deflection angles. Meanwhile, due to the polarization selection function of the circular polarization selection metasurface, the profile height of the antenna is half of the focal length of a traditional reflective array. By rotating the lower-layer reflective array antenna and the upper-layer circular polarization selection metasurface, the antenna can realize simultaneous + / -42-degree pitch angle scanning and 360-degree azimuth angle scanning of left-hand circular polarization and right-hand circular polarization dual beams, and the aperture efficiency, the axial ratio, the scanning loss and other performances are good. The low-profile dual-circularly-polarized wave beam scanning folding reflection array antenna provided by the invention can realize simultaneous scanning of two circularly-polarized wave beams, and is low in profile, compact in structure, low in cost and novel in function.

The invention provides a fixed-frequency beam scanning leaky-wave antenna and electronic equipment. The leaky-wave antenna comprises a first microstrip line and a second microstrip line, wherein the first microstrip line and the second microstrip line are used for transmitting radio frequency signals and are arranged at an interval; the N antenna units are connected to the first microstrip line and the second microstrip line, and each antenna unit comprises a first switch and a second switch; a first stub and a second stub, and an antenna. According to the technical scheme, the leaky-wave antenna is simple in structure, easy to process, high in expansibility and capable of reducing parasitism, transmission loss, element loss and the like.

The invention relates to a space coupling wind measurement laser radar real-time processing method. The method comprises the following steps of performing quality inspection and data preprocessing on acquired power spectrum data; carrying out radial speed extraction on the power spectrums of the plurality of beam directions and the plurality of range gates; constructing a space coupling constraint based on the space continuity of the atmospheric wind field and the geometric law of vector projection; solving a global objective function containing a data fitting item and a spatial constraint item through a joint optimization algorithm to obtain optimal wind field estimation; and outputting the three-dimensional wind field and performing quality evaluation. According to the method, the coupling relationship between different spatial position measurement values is established by using spatial redundant information obtained by multi-beam scanning of the wind measurement laser radar, the wind field inversion precision is improved through a global optimization method, the abnormal value suppression capability is enhanced, and the spatial continuity of an inversion result is ensured.

The invention provides a communication method, device and system, a computer program product and a readable storage medium, and the method can be applied to a communication scene exemplarily. In the method, the terminal device can perform blocking sensing based on the variation of the pose data and the variation of the signal quality data, and reports the sensed whether the terminal device is blocked or not and the blocking sensing type under the blocked condition to the network device. Thus, the network device can perform beam adjustment according to the blocking sensing type reported by the terminal device, such as frequency band or bandwidth adjustment, or determine a small number of candidate scanning beams corresponding to the blocking sensing type to perform selection and switching of available beams. According to the method, the network equipment can quickly determine a small number of accurate candidate scanning beams according to the blocking sensing type, the overhead of full beam scanning is reduced, and beam recovery is quickly realized.

According to the large-depth-diameter-ratio micropore laser rotary-cutting precision machining system and method, light beam self-rotation and light beam scanning are achieved through a compact rotating assembly integrating a Dove prism and double reflectors, the off-axis angle and the off-axis amount are precisely regulated and controlled through deflection and movement of the reflectors, light beams are subjected to off-axis focusing through a focusing assembly, and the precision of laser rotary-cutting precision machining is achieved. Finally, a light path focusing mode of first converging and then off-axis focusing is formed, large-depth-diameter-ratio micropore machining is achieved, the aperture range is dozens of micrometers to several millimeters, and the maximum depth-diameter ratio can reach 15: 1 or above; the device is compact in structure, a complex adjusting system is not needed, the control mode is simple, high rotating speed can be achieved, ultra-short pulse time domain broadening is reduced through the double-reflector system, and machining of hole patterns such as steep straight holes and taper holes can be achieved.

The invention discloses a high-precision beam alignment method for an Internet of Vehicles ground-non-ground converged communication system and a vehicle-mounted communication terminal, and belongs to the technical field of cellular and satellite converged communication. A two-stage control strategy of'coarse tracking + fine tracking 'is adopted. The method comprises the following steps: firstly, based on GNSS / INS fusion positioning and satellite orbit prediction (SGP4 model), quickly calculating and finishing initial coarse alignment of a wave beam; and then, constructing a local beam scanning window, collecting received signal intensities (RSSI) in multiple directions as observed values, introducing an extended Kalman filter (EKF) algorithm, and establishing a state space model for recursive estimation, thereby realizing high-precision and dynamic closed-loop optimization and tracking of a beam pointing angle. According to the invention, the speed and the precision of beam alignment are obviously improved, the anti-interference capability and the link stability of the system in a dynamic environment are enhanced, and the continuous communication service in the sky-ground fusion Internet of Vehicles is effectively guaranteed.

The invention belongs to the technical field of radar test and simulation, and particularly discloses a multimode mixed injection type semi-physical radar target simulation evaluation system and method, which comprises a radar / electronic warfare beam synchronization unit, an injection type radar target simulation evaluation system and a simulation control unit. The system obtains radar real-time beam scanning information through a beam synchronization unit, carries out real-time fusion on the radar real-time beam scanning information and avionics control data from an avionics system test bench, drives an injection type system to generate a simulation radio frequency target containing a sum signal, an azimuth difference signal and a pitch difference signal, and provides the simulation radio frequency target to a radar to be tested in an injection mode. And the simulation control unit is responsible for man-machine interaction, controlling a test process and performing automatic comprehensive evaluation on a simulation result. According to the method, automatic evaluation of dynamic closed-loop simulation, multi-mode seamless switching and high-order tactical indexes can be realized, and the method is suitable for high-fidelity performance verification of a modern radar system.

The embodiment of the invention discloses a maritime search and rescue target detection method, device and equipment based on a harmonic radar. A specific implementation mode of the method comprises the following steps: generating a plurality of paths of emission excitation signals through a signal processing board and a first wave band receiving and transmitting module; performing electron beam scanning on the target sea surface area according to the antenna module, the first wave band receiving and transmitting module and the multiple paths of transmitting excitation signals; performing waveband front-end processing on the second waveband echo signal to generate four paths of polarized monopulse channel signals; performing frequency domain polarization feature extraction on the four paths of polarization monopulse channel signals to generate a signal frequency domain polarization feature set; and performing adaptive target detection on the signal frequency domain polarization feature set to generate a search and rescue target detection result. According to the embodiment, an S / C harmonic radar and a dual-polarization phased array structure are adopted, and the search and rescue target generates a receivable harmonic echo, so that sea clutter energy is suppressed in two physical dimensions of frequency band and polarization, and stable detection of the search and rescue target is further realized.

The embodiment of the invention provides a laser scanning method and device, laser communication equipment and a laser communication system. The laser scanning method comprises the steps that a pointing center point where a target object is located is determined according to ephemeris information of the target object; the rotation angles of a plurality of array elements in the transceiving array are controlled, so that light beams emitted by the array elements are subjected to incoherent superposition to form scanning light spots, and the light beams emitted by the array elements are obtained through deflection of incident light of the transceiving array; scanning in a preset range pointing to the center point by adopting the scanning light spot, and controlling the rotation angles of a plurality of array elements in the transceiving array to enable light beams emitted by the plurality of array elements to be coherently superposed to form a scanning light beam under the condition that the first position of the target object is scanned; and scanning the first position with the scanning beam to capture the target object. The non-coherently stacked scanning light spots are firstly used for coarse positioning, and then the coherently stacked scanning light beams are used for fine positioning, so that efficient, rapid and accurate capturing of the rapidly moving target is realized.

The application provides an electrically-controlled beam scanning leaky-wave antenna and a communication device. The leaky-wave antenna comprises a gap waveguide including a strip-shaped ridge, the gap waveguide being used for transmitting electromagnetic waves in the form of a traveling wave, the strip-shaped ridge being arranged in the gap waveguide along a transmission direction of the electromagnetic waves; and a plurality of radiation units arranged on a side wall of the gap waveguide, each of the radiation units comprising a radiation slot and an electrically-controlled switch, the radiation slot being used for leaking electromagnetic waves in the gap waveguide to a free space to form a beam, and the electrically-controlled switch being used for controlling an operating state of the radiation slot to realize beam scanning. The leaky-wave antenna provided by the application can improve the beam tilting characteristics of the antenna and improve the communication quality of the antenna.

The invention discloses an electrically-controlled beam scanning leaky-wave antenna and communication equipment, belongs to the technical field of antennas, and is used for solving the problems that an existing antenna is complex in structure and the beam scanning angle is limited under a fixed frequency. The electrically controlled beam scanning leaky-wave antenna comprises a gap waveguide and a plurality of radiation units. The gap waveguide comprises a cover plate and a metal bottom plate which are oppositely arranged, and a ridge structure arranged on the upper surface of the metal bottom plate in the transmission direction of the electromagnetic waves, and the gap waveguide is used for transmitting the electromagnetic waves in a traveling wave mode; the plurality of radiation units are sequentially arranged on the cover plate along the extension direction of the ridge structure; each radiation unit comprises a radiation patch, two radiation slots and two electric control switches which are sequentially arranged from top to bottom, and the radiation slots and the electric control switches are distributed in a central symmetry manner relative to the radiation patch; and each electric control switch is used for controlling the working state of the corresponding radiation slot so as to regulate and control the radiation phase of the radiation unit and realize beam scanning.

The invention discloses a dual-band dual-linear polarization reconfigurable folding transmission-reflection array antenna, which comprises an upper-layer metasurface, a lower-layer metasurface and a feed source antenna, the upper-layer metasurface is provided with 12 * 12 first unit structures, and each first unit structure comprises a first metasurface metal patch, a first dielectric substrate, a second metasurface metal patch, a second dielectric substrate and a third metasurface metal patch which are connected from top to bottom; the lower-layer metasurface is provided with 12 * 12 second unit structures, and each second unit structure comprises an annular gap metal patch, a third dielectric substrate and a bottom-layer feeder line which are connected from top to bottom; two PIN diodes are integrated in an annular gap of the annular gap metal patch, and the annular gap metal patch is connected with a bottom feeder line located on the upper surface of the third dielectric substrate through a feed probe; and a 2 * 2 unit size is reserved in the center of the lower-layer metasurface and is used for placing a feed source antenna. According to the invention, dual-frequency dual-linear polarization bidirectional wave beam scanning is realized, and the low-profile characteristic is realized.

Provided are an array selection method, a terminal, a network device, and a storage medium. The method includes sending assistance information to a network device, and the assistance information includes at least one of the following: identifier information of an optimal reference signal required for uplink transmission, and an array-based maximum power reduction (P-MPR) value corresponding to one or more arrays of a terminal when a maximum power exposure (MPE) event occurs; and receiving indication information sent by the network device on the basis of the assistance information, and the indication information is used for indicating an array used by the terminal for subsequent uplink transmission, or for indicating that the terminal performs new uplink beam scanning. The embodiments of the present application avoid the uplink coverage loss caused by an MPE issue.

Provided are an electronic device and method for wireless communication, and a computer-readable storage medium. The electronic device comprises: a processing circuit which is configured to: send downlink reference signal resource configuration information to a user equipment, so as to perform downlink beam scanning, wherein the downlink reference signal resource configuration information comprises information of a transmit receive point that transmits a downlink transmission beam; and receive a packet-based beam quality report from the user equipment, wherein the packet-based beam quality report is used for a network side to determine, for the user equipment, a group of downlink transmission beams which can be simultaneously transmitted and can be simultaneously received by the user equipment.

The invention discloses a 30CrMnSi alloy steel electron beam welding method and application thereof, and relates to Cr-Mn-Si alloy steel electron beam welding, and the 30CrMnSi alloy steel electron beam welding method specifically comprises the steps that a plurality of sections of cleaned to-be-welded parts are assembled in pairs to form to-be-welded weld joints, and the to-be-welded weld joints are subjected to section welding; electron beam scanning preheating is conducted on the to-be-welded weld joint after segment welding; the preheated to-be-welded weld joint is subjected to seal welding, and the focusing current is set to be in a surface focusing state during seal welding; welding the to-be-welded weld joint after seal welding, wherein the focusing current is set to be in a lower-focus state during welding; and performing modification welding on the welded weld joint, wherein the focusing current is set to be in an upper-focus state during modification welding. According to the method, under the cooperative treatment of electron beam scanning preheating, seal welding, welding and modification welding on the weld joint to be welded, the smooth weld joint without cracks, splashing and pits is finally obtained, so that the workpiece to be welded can reach the GJB-1718A standard, and the requirement for nondestructive testing of the I-level weld joint of pressure-bearing equipment is met.

The LIDAR system may include a laser emitting unit configured to generate multiple laser beams. The LIDAR system may also include an optical system configured to transmit the multiple laser beams from the laser emitting unit to a common scanning unit. The common scanning unit may be configured to project the multiple laser beams toward a field of view of the LIDAR system to simultaneously scan the field of view along multiple scan lines across the field of view.

Disclosed in the present invention are a conical optical illumination-based reflective scanning super-resolution optical microscopy system and method. The system comprises a sample displacement module, an optical microscopic imaging module, an annular focused beam generation module, a beam scanning module, a super-resolution focused illumination and collection module, a super-resolution optical imaging module and a computer. By means of using the advantages of annular focused beam illumination, high focusing efficiency of traditional lenses, and high beam scanning speed, high-efficiency super-resolution focused illumination with an extended depth of focus is achieved, and further traditional optical lenses can be used to achieve fast super-resolution optical microscopic imaging; fast label-free far-field super-resolution two-dimensional microscopic imaging is implemented by means of two-dimensional beam scanning; by means of performing label-free far-field super-resolution two-dimensional microscopic imaging on samples at different axial positions, super-resolution two-dimensional microscopic images of different cross sections of samples are obtained, thereby achieving three-dimensional tomography. The present invention can be applied to fast label-free super-resolution microscopic imaging of biological samples, and can also be applied to other fields such as industrial super-resolution microscopic inspection.

Disclosed is devices and techniques for 3D LiDAR sensing without beam scanning with moving parts or 2D optical imaging based on the combination of a lens' position-to-angle conversion and the wavelength division multiplexing / demultiplexing (WDM) in the output probe light for LiDAR sensing. This 3D LiDAR sensing can be implemented on stacked photonic integrated chips to provide.

The invention discloses a point cloud data generation method, device and equipment, and the device comprises an electromagnetic wave transmitting module which is used for transmitting electromagnetic waves; the beam scanning module is used for deflecting electromagnetic waves to scan a target object along set directions, and the set directions comprise a first direction and a second direction; the echo receiving module is used for receiving echo signals reflected by electromagnetic waves scanning the target object, the echo signals comprise forward echo signals and reverse echo signals, the forward echo signals refer to echo signals reflected by electromagnetic waves scanning the target object in the first direction, and the reverse echo signals refer to echo signals reflected by electromagnetic waves scanning the target object in the second direction. The reverse echo signal refers to an echo signal reflected by an electromagnetic wave which scans the target object along a second direction; and the point cloud generation module is used for generating point cloud data of the target object according to the forward echo signal and the reverse echo signal, and the point cloud data indicates the distance between the device and the target object.

The invention discloses a physical layer authentication method and system based on random beam scanning and power feedback. The method comprises the steps that a transmitting end randomly arranges a predefined angle set in each round of scanning and transmits test signals one by one, and a receiving end measures power and feeds back an optimal beam label. Although the eavesdropping end can monitor the same signal, the eavesdropping end can only obtain partial power sorting information and cannot accurately deduce the optimal beam. According to the invention, the security of physical layer authentication can be effectively improved, the disguise risk is reduced, and the method is suitable for large-scale MIMO and millimeter wave communication systems.

The application is suitable for the field of wireless communication technology, and provides a cross-band tomographic model guided environment knowledge base construction and utilization method and device, a wireless communication system and a storage medium, which comprises the following steps: a wireless distributed node performs periodic beam scanning, and records wireless measurement data of multiple frequency bands to the local based on data acquisition signals of a wireless base station; the wireless distributed node generates wireless propagation channel multipath parameters based on the wireless measurement data, combines position and attitude to acquire local environment knowledge data and feeds back to the wireless base station; the wireless base station receives and stores the local environment knowledge data, combines multi-sensor data to construct a cross-band tomographic model guided environment knowledge base; and the wireless base station assists the wireless communication process between the wireless base station and the wireless distributed node based on the environment knowledge base. According to the application, the cross-band tomographic model guided environment knowledge base is used by the wireless distributed node to realize multi-node beam tracking, which can reduce beam overhead and improve communication spectrum efficiency.

The invention discloses a curved surface conformal phased array directional diagram analysis method, system and device and a storage medium, and belongs to the technical field of phased array antennas. The method comprises the following steps: performing spherical harmonic function expansion on electric field pattern data of an antenna unit in a local coordinate system to obtain an analytical expression of a unit pattern under the local coordinate system; the unit pattern factors of all the antenna units under the global coordinate system can be obtained by using the analytical expression, then the pattern contributions of all the antenna units are obtained, and the curved surface conformal phased array beam scanning pattern is synthesized after superposition. According to the method, the simulation quantity is extremely small, the problem that calculation is slow when the number of interpolation points is large due to an interpolation method is solved, the calculation efficiency and precision are greatly improved, and the method can be applied to analysis of any curved surface conformal phased array directional diagram, especially application scenes with the large number of antenna units.

This invention provides an artificial surface plasmon full-space beam scanning leaky antenna, comprising a dielectric substrate. The upper and lower surfaces of the dielectric substrate form a top layer and a bottom layer, respectively. The top layer of the dielectric substrate has a balun structure, an artificial surface plasmon strip group, and several metal stubs. Balun structures are symmetrically arranged at both ends of the artificial surface plasmon strip group. Several metal stubs are periodically arranged and symmetrically arranged on the upper and lower sides of the artificial surface plasmon strip group. The artificial surface plasmon strip group includes a pair of slidingly symmetrical artificial surface plasmon strips. This invention enables continuous scanning of the main beam from back-firing to front-firing, possessing full-space beam scanning capability. It has advantages such as small bandwidth occupation, high radiation efficiency, high directivity, high gain, low profile, and relatively small overall size, and can be applied in wireless communication fields such as automotive radar.

The invention provides an electron beam detection electron microscope, a related equipment module and an electron beam scanning imaging method. The related equipment module comprises electron beam detection control equipment and a detection execution module. In the electron beam detection electron microscope, the electron emission module emits electron beams to a sample to be detected, and the detector module comprises a transmission detection unit and a non-transmission detection unit. The non-transmission detection unit is arranged between the electron emission module and the bearing surface of the sample bearing platform, detects non-transmission signal electrons generated when the electron beam focuses and scans the sample to be detected, and outputs non-transmission detection signals. The transmission detection unit is arranged on one side of the back side surface of the sample bearing platform and is used for detecting and collecting signal electrons of a transmission diffraction image generated by focusing transmission scanning of the sample to be detected by an electron beam and outputting a four-dimensional transmission detection signal, and the electron beam detection control equipment forms a scanning image according to a non-transmission detection signal and the four-dimensional transmission detection signal; the detection efficiency of the material characterization of the to-be-detected sample is effectively improved.

This application proposes a sliding-window type electrically controlled beam scanning conical antenna array, comprising a conical antenna support, antenna elements, and a beam control network. The conical antenna support consists of 13 trapezoidal surfaces with an elevation angle of 5°. There are 14 antenna elements in total. Two antenna elements located on the same trapezoidal surface are fed to antenna elements on their adjacent trapezoidal surfaces via unequal phase feeding to form two high-gain antennas. These two high-gain antennas combine to form a high-gain beam. Simultaneously, the high-gain antennas combine with their adjacent antenna elements to form a directional beam. The remaining adjacent antenna elements can also combine to form directional beams. The conical antenna array has 12 directional beams, with a pointing angle difference of 30° between adjacent beams. The beam control network can achieve rapid switching between the 12 beams, realizing sliding-window type electrically controlled beam scanning and forming 360° azimuth coverage. This sliding-window type electrically controlled beam scanning conical antenna array significantly reduces costs while possessing sliding-window type electrically controlled beam scanning capabilities.

The invention discloses a multi-communication-system beam communication method and device and related equipment, and the method comprises the steps: distributing corresponding time domain resources for different communication systems according to the transmission demands of the different communication systems and the time distribution granularity of the time domain resources, and obtaining time frequency resources distributed for each communication system; for users under the same communication system, transmitting signals by using the time-frequency resources allocated for the same communication system, the signals carrying waveform synchronization heads corresponding to the same communication system; wherein the signal comprises a signaling channel signal and a service channel signal. Therefore, the problem that the existing beam scanning mechanism cannot meet the communication transmission requirements of users of different communication systems in each resident beam position is solved.

The invention provides an unmanned aerial vehicle direction finding system and method based on electronic beam scanning, and the system comprises a beam scanning antenna which works in a receiving mode and is used for receiving an unmanned aerial vehicle radio frequency signal in a preset airspace, and transmitting the unmanned aerial vehicle radio frequency signal to a frequency spectrum feature analysis module; the beam pointing controller is used for controlling the phase distribution of the beam scanning antenna and realizing the adjustment of the main beam direction; the spectrum feature analysis module is used for performing real-time spectrum analysis on the received unmanned aerial vehicle radio frequency signal and sending an analysis result to the intelligent control unit; and the intelligent control unit is used for controlling the beam pointing controller and the spectrum feature analysis module. According to the technical scheme provided by the invention, the detection, identification and positioning capabilities of the low-altitude safety protection system on the unmanned aerial vehicle target in a complex environment can be improved.

The application relates to the field of wireless communication and sensing technology, and particularly discloses a two-dimensional antenna array multi-beam scanning method based on holographic amplitude weighting, which comprises the following steps: determining the position information of each radiation unit in the two-dimensional antenna array, including calculating the unit spacing and arrangement mode; generating the amplitude weighting value of each radiation unit according to the target wave direction; using the two-dimensional multi-beam holographic amplitude weighting technology, the amplitude weighting value of the radiation unit is determined through the two-dimensional multi-beam holographic amplitude weighting technology; generating the corresponding binary discretization coding sequence based on the amplitude weighting value to control the excitation amplitude of each radiation unit; designing a Ka-band two-dimensional holographic beam scanning leaky-wave antenna square array based on liquid crystals, and the radiation pattern of the two-dimensional antenna array is regulated and controlled through the coding sequence to realize multi-beam scanning.