1152 results about "Directivity" patented technology

The invention discloses a weight-constrained array antenna shaped beam gain optimization method and device, and the method comprises the steps: setting an array structure and target shaped beam parameters according to a set target; according to the relational expression of the weight and the directivity coefficient, constructing a shaped beam maximization directivity coefficient weight optimization model; obtaining an initial array weight according to the main lobe width of the target beam; solving and optimizing variables in the optimization model through an alternating direction multiplier method to obtain an optimization result, calculating an original error of the variables according to the result, and obtaining a maximum value of the original error through calculation; comparing the original error with a set error threshold, if the original error is smaller than the set error threshold, stopping iteration, and outputting a final array element weight; and if the original error is not smaller than the set error threshold, iteratively calculating the original error until a set iteration frequency is reached, and outputting a final array element weight. According to the invention, the main lobe gain can be improved and the amplitude dynamic range ratio can be reduced while the beam shape is satisfied.

The invention belongs to the technical field of acoustic signal transmission, and particularly relates to a preparation method of an underwater sound source based on cross-water and cross-air metasurface packaging, and the method comprises the steps: obtaining a waterproof cavity with a cross-water and cross-air metasurface through the target frequency range of the underwater sound source and the boundary dimension optimization of an underwater sound source element; one or more air loudspeakers are packaged in a waterproof cavity to be assembled into an underwater sound source element, and a plurality of underwater sound source elements are arrayed according to the requirement of transmitting underwater sound beams. The underwater sound source prepared by the invention has a certain broadband characteristic and adjustable directivity, and can realize cross-medium sound wave transmission more efficiently. In addition, the invention also discloses an underwater sound source based on cross-water-air super-structure surface packaging.

The invention relates to an ultrasonic phased array full-focusing imaging method for acoustic wave multi-path propagation compensation of a layered composite material, which is characterized by comprising the following steps of: arranging an ultrasonic phased array probe with N array elements on a composite material piece to be detected, obtaining complete echo data by taking each array element as a transmitting array element and taking all array elements as receiving array elements in sequence in a full-matrix acquisition mode; a two-dimensional pixel grid is established in an imaging area, a Monte-Carlo perturbation mechanism used for representing the acoustic wave propagation uncertainty in the layered composite material is introduced into a propagation model for each emission array element-receiving array element-pixel point combination, and the acoustic beam emission direction, the propagation path and the equivalent acoustic velocity are subjected to random perturbation, so that the acoustic wave propagation uncertainty in the layered composite material can be represented. Generating a plurality of equivalent sound wave propagation paths, calculating two-way propagation time of each path, and performing weighted statistics on energy contributions of different paths according to array element sound beam directivity to obtain equivalent propagation time delays of pixel points; and performing delay correction on a full-matrix echo signal by using the equivalent propagation time delay, and performing coherent superposition on signals of all transmitting-receiving array element combinations to realize dynamic focusing of a full-pixel grid, and finally reconstructing an ultrasonic full-focusing imaging image with high resolution and high signal-to-noise ratio. The time delay error caused by propagation path deviation and sound velocity non-uniformity in the layered composite material can be effectively compensated, the focusing precision and spatial resolution of full-focusing imaging are improved, meanwhile, an existing TFM imaging frame does not need to be changed, and the method has good engineering implementability and popularization and application value.

The invention discloses a reflective slot antenna for RFID tag inventory, and relates to the technical field of antenna design, the slot antenna design scheme of the invention greatly enhances the directionality and signal coverage capability of the antenna through a phase control algorithm and slot arrangement optimization, and improves the signal coverage capability of the antenna through adjusting the phase difference and the slot spacing. The radiation intensity of the antenna in multiple directions is enhanced, blind areas are effectively reduced, multi-path interference is effectively identified and suppressed through a multi-path signal processing algorithm and an LMS minimum mean square error algorithm, and the antenna can automatically adjust the phase of reflection current and filter reflection signals, so that the signal quality of a complex reflection environment is guaranteed, and the signal quality is improved. In addition, an adaptive array antenna system and a beam forming technology are introduced, so that the antenna can dynamically adjust the phase and amplitude of an array unit according to real-time data fed back by the RFID tag, thereby forming a directional beam, concentrating energy to a specific direction, and improving the recognition precision in a specific area.

The invention discloses a power prediction method and equipment of a wave energy device, a medium and a product, and relates to the field of output power prediction.The method comprises the steps that water depth topographic data and wind field data of a target sea area are obtained; solving a wave field at a wave energy device by adopting an improved wave energy balance control equation according to the water depth topographic data and the wind field data; according to the wave height and the wave period of the wave energy device, determining the output power of the wave energy device by adopting a quadratic linear interpolation method, and taking the output power as initial output power; and according to the wave direction of the wave energy device, correcting the initial output power by using a directivity weighting function to obtain corrected output power. The output power prediction accuracy of the wave energy device can be improved.

The invention provides a side slope crack passive source seismic wave imaging method, which adopts a multi-wave multi-component seismograph to simultaneously collect a plurality of seismic wave signals on three components, including surface waves, body waves and the like. According to the design, the richness of the data is remarkably improved, so that the physical characteristics of various seismic wave signals can be comprehensively utilized for inversion analysis in data processing. Through combined processing and constraint of different wave types, the problem of multiplicity of solutions in geophysical inversion can be effectively reduced, and the stability and reliability of a result are improved. In addition, due to acquisition of multi-component data, imaging is more comprehensive, and particularly, the method has obvious advantages in description of fracture directivity and geometrical characteristics.

The invention discloses a near / span strike-slip fault seismic oscillation synthesis method for a bridge structure. The method comprises the following steps: step 1, selecting a near fault pulse type seismic record matched with a target response spectrum according to a bridge site and a wave selection principle; 2, rotating and changing the seismic record to parallel and vertical fault directions, and decomposing the seismic record into a high-frequency component and a low-frequency component by using a filter; and step 3, further decomposing the low-frequency component based on continuous wavelet variation, simulating a pulse component by using a pulse function, and introducing a particle swarm optimization algorithm to determine a fitting parameter. And 4, superposing the residual component, the artificial fitting pulse and the high-frequency component to obtain broadband near-fault seismic oscillation. And 5, selecting a pulse waveform with a slip effect and a directivity effect to replace the fitting pulse, extracting a sub-high-frequency component in the residual component, and finally superposing the sub-high-frequency component and the high-frequency component to obtain cross-fault seismic motion, thereby realizing accurate simulation of strike-slip fault ground motion.

The RFID antenna module comprises a shell, a metal shielding shell, a transmitting antenna, a cover plate and aluminum foil paper, a first mounting groove is formed in the upper portion of the shell in the width direction of the paper, a second mounting groove is formed in the upper surface of the metal shielding shell in the width direction of the paper, the metal shielding shell is mounted in the first mounting groove, and the transmitting antenna is mounted in the second mounting groove. The transmitting antenna is mounted in the second mounting groove, the cover plate is made of a non-metal material, covers the first mounting groove and is located on the outer side of the transmitting antenna, the aluminum-foil paper is attached to the inner end face of the cover plate, a through hole is formed in the aluminum-foil paper in a penetrating mode in the paper width direction, and the through hole is opposite to the transmitting antenna. According to the scheme, three-face metal shielding is utilized, the one-way emission performance of the antenna is improved, the antenna is suitable for ultra-near-field RFID identification, the anti-collision capacity of the tag is greatly improved, and the antenna has good one-way directivity.

The embodiment of the invention provides a beam weight generation method, device and equipment, and relates to the technical field of communication, and the method comprises the steps: respectively setting signal snapshots and array manifold vectors of an expected angle and an unexpected angle of a to-be-generated beam; wherein the expected angle is an angle corresponding to a main lobe of a to-be-generated beam, and the unexpected angle comprises an angle corresponding to a side lobe of the to-be-generated beam; generating a cost function according to the set signal snapshot and the array manifold vector; the variable of the cost function is the weight of a to-be-generated beam, and the dependent variable is the sum of a first preset parameter and a second preset parameter; and performing iterative operation on the cost function on the basis of a preset local particle swarm optimization algorithm based on a von Noiemann topological structure so as to obtain a target weight of the to-be-generated beam. According to the embodiment of the invention, the technical problem that the beam directivity and the main lobe power are difficult to consider in the existing weight generation mode of the multi-peak beam can be solved.

The invention relates to the technical field of chip preparation, and provides a chip based on an annular photonic crystal and a preparation method thereof. The preparation method comprises the following steps: growing a nucleating layer on a substrate; growing a superlattice structure on one side, away from the substrate, of the nucleating layer; sequentially growing an n-type coating layer, an n-type waveguide layer, a quantum well and a p-type electron blocking layer on one side, deviating from the nucleating layer, of the superlattice structure; etching a plurality of annular cavities on the p-type electron barrier layer to form an annular photonic crystal; growing a p-type extension contact layer on one side, deviating from the quantum well, of the p-type electron blocking layer; and carrying out in-situ annealing treatment. According to the preparation method, the directivity of the photonic band gap can be effectively adjusted, uniform light waves in all directions on the side face can be formed, so that leakage of laser from a non-light-emitting area on the side face is restrained, the light emitting efficiency is improved, the annular photonic crystals are periodically distributed, and the light beam quality is effectively guaranteed.

The invention provides a radio frequency multichannel amplitude-phase calibration method based on a full-automatic error variable, and the method comprises the steps: carrying out the length-set sampling data of the amplitude of a real-time signal, carrying out the fast Fourier transform, and carrying out the amplitude-phase error estimation, thereby forming a full-automatic error variable reference, and carrying out the calibration of the amplitude-phase of the full-automatic error variable. Therefore, the automatic calibration of the amplitude phase error between the channels is conveniently and quickly realized, the calibration precision is high, the amplitude and phase difference between the channels can be effectively eliminated, the directivity accuracy of the system beam is ensured, and the evaluation system is ensured to simulate the orientation, distance and other related information of the target according to actual combat requirements. And rapid and efficient evaluation on the receiving and transmitting channel performance of the radar can be realized.

The invention relates to the technical field of optical fiber gyroscopes, in particular to a temperature control optical fiber inertial navigation structure and a design method thereof.The design method comprises the following steps of detecting heat flow direction changes, extracting offset numbers, generating frequency density, analyzing the thickness contour and deformation coincidence rate, outputting correction gradients, matching jump trends and structural connection, and generating a priority sequence; and screening offset channel numbers, integrating compression and deformation trends, and outputting a design scheme. According to the method, by capturing heat flow direction change points and extracting offset area numbers, density expression of a heat energy propagation path is achieved, the space recognition capability of thermal disturbance is enhanced, the structural adaptability of thermal response is improved, and stable conduction of heat flow between structural levels is optimized through sequence integration of a temperature jump trend and a connection relation; and extracting a stable channel number in a lateral offset state, enhancing path directivity, integrating a multi-region compression trend and structural deformation mapping, and improving thermal situation identification capability and structural thermal adaptability.

The invention discloses a portable satellite communication station signal optimization method and system, relates to the field of wireless communication, and is used for synchronously realizing dynamic adaptive management of multiple scattering paths. The method comprises the following steps: generating an earth surface image through multi-modal detection data, and carrying out layered calibration on scattering intensity; identifying a high-reflection sub-region according to the surface image and the layered calibration information thereof, and performing unified management on high-reflection and weak echo paths; based on the gain, interference and angle information of the multiple scattering paths, performing sub-array division on the antenna array according to priorities; phase stepping correction is carried out on the antenna units of the sub-arrays, and emission excitation is combined in adjacent path coverage areas; through a dynamic power scheduling and beam forming algorithm, the direction gain of each sub-array is optimized and sidelobe leakage is controlled. According to the invention, synchronous management of high reflection and weak echo paths can be realized, and the dynamic adaptability to scattering scenes is improved.

The invention discloses a compact broadband wide-beam dipole antenna array based on a high-order mode, which comprises two sub-arrays, the two sub-arrays share a dielectric substrate of which the upper surface and the lower surface are partially coated with copper, the equal-amplitude feed is carried out through a one-to-two power division feed structure, the two sub-arrays are bilaterally symmetrical about the central axis of the dielectric substrate, and the upper surface and the lower surface of the dielectric substrate are partially coated with copper. Each sub-array comprises a substrate integrated waveguide cavity and a plurality of pairs of side-by-side dipoles which are connected through a grounding coplanar waveguide, the substrate integrated waveguide cavity is formed by arranging metalized via holes at equal intervals and works in a TE510 high-order mode, the dipoles are placed in the center of the periphery of each electric field loop of the substrate integrated waveguide cavity, and the ground coplanar waveguide is connected with the substrate integrated waveguide cavity. High directivity of an H plane and unilateral radiation with 3dB beam width of an E plane can be obtained by placing the radiation arms of the dipoles according to a radiation field superposition and cancellation rule. The problems that an existing wide-beam antenna is complex in structure, and the technical scheme is difficult to achieve are solved.

The invention discloses an unmanned aerial vehicle countering method and countering device for radio detection, and relates to the field of signal processing, and the method comprises the steps: scanning and capturing a transient radio frequency pulse signal through a radio frequency receiving array, carrying out the time-frequency domain conjoint analysis, constructing a signal intensity space distribution matrix, and extracting a parameter set; matching with a protocol feature library, identifying an unmanned aerial vehicle remote control link protocol type, and calculating an unmanned aerial vehicle position and a threat level in combination with a signal time difference of arrival and a frequency difference; generating adaptive interference signal parameters according to the protocol type and the threat level; the method comprises the following steps: generating a directional beam through a two-dimensional phased-array antenna, focusing the position of an unmanned aerial vehicle to transmit an interference signal, monitoring signal intensity change and protocol response delay in real time, calculating a communication suppression ratio, and iteratively optimizing an interference strategy until a suppression threshold is reached. The method has the advantages that efficient and accurate signal capture and interference are realized through multi-channel radio frequency detection, accurate positioning and adaptive interference technologies, and the countering efficiency and adaptability are remarkably improved.

The invention provides a dense small target detection method based on fuzzy perception. The method comprises the following steps: averagely segmenting an infrared image into a plurality of regions, blocks and sub-blocks; utilizing a nested four-way Mama network to respectively extract the features of the regions, the blocks and the sub-blocks, and sequentially embedding and fusing the extracted features to obtain an initial feature map; transmitting the initial feature map to a multi-scale context collaborative network, and outputting a final prediction feature map through information transmission and feature fusion operation; inputting the final prediction feature map into a detection head, and outputting arbitrarily distributed detection frame representation and detection frame quality estimation; and weighting the loss function and fusing the directivity to obtain a boundary fuzzy perception loss function for optimizing the whole process of small target detection. According to the method, the thermal radiation target with relatively high spatial distribution density can be accurately positioned in a complex scene, and the accuracy of infrared dense small target detection is improved.

The invention discloses an amplitude-phase-adjustable microstrip line high-directional coupling structure and a multichannel coupler. The amplitude-phase-adjustable microstrip line high-directional coupling structure comprises a dielectric plate, and an input port, a transmission port, a coupling port and an isolation port which are arranged on the dielectric plate, the input port is connected with the transmission port through the microstrip line, and the transmission port is used for being connected with the antenna port; the coupling port is connected with the isolation port through the two-stage coupling passband; the coupling port is used for outputting a coupling signal; the length of the coupling part of the two stages of coupling passbands can be adjusted; and a phase regulator for regulating the phase is arranged between the two stages of coupling passbands. The phase difference is formed through the distance between two stages of coupling, the amplitude and the phase are adjusted, coupling output is achieved at a coupling port, high isolation is achieved at an isolation port, and the problem that due to the fact that upper and lower media of a microstrip line high-directionality coupler are not uniform, the phase velocities of odd and even modes in the microstrip coupler are different, and the directionality of the microstrip line high-directionality coupler is poor is effectively solved. And the directivity is poor.

The invention discloses an integrated optical fiber ultrasonic endoscope and a preparation method, and belongs to the field of ultrasonic sensors. Comprising a multi-core optical fiber, a dielectric film, a strip-shaped sensing layer, a mixed excitation inclined wedge, a sensibilization column and an endoscopic sheath. Double sensibilization is achieved through the sensibilization columns and the strip-shaped sensing layer, the sensitivity of lateral sensing is greatly improved, and good directivity is achieved on a film layer plane through the strip-shaped structure of the sensing layer. And the mixed excitation inclined wedges respectively realize side sound field excitation which is double and quadruple of that of the traditional single-mode optical fiber in two intensity directions. The problems that an existing optical fiber ultrasonic sensor is large in size, low in excitation power, low in integration level and low in sensitivity are solved.

The invention provides a wave-absorbing material, and belongs to the technical field of electromagnetic wave absorption. The wave-absorbing material comprises a metal reflection bottom layer, a wave-absorbing middle layer and a scattering upper layer, the wave-absorbing middle layer is made of a ferroferric oxide loaded reduced graphene oxide and epoxy resin (Fe3O4 (at) RGO / EP) composite material and used for absorbing electromagnetic wave energy, and the scattering upper layer is of a patterned metasurface structure made of chopped carbon fiber reinforced epoxy resin (SCF / EP). And a phase-regulated two-dimensional periodic array is formed. By arranging a three-layer structure of the metal reflecting layer, the Fe3O4 (at) RGO / epoxy composite wave-absorbing layer and the chopped carbon fiber scattering layer, broadband absorption and directional scattering control of electromagnetic waves within the range of 2-18 GHz are achieved, a stealth function composite material system with dissipation and deflection dual-mechanism cooperative work is formed, the structure utilizes the patterning design of the scattering layer, and the structure has the advantages that the structure is simple, the structure is compact, and the application range is wide. On the basis of the generalized Snell's law, engineering regulation and control of the radar wave reflection direction are achieved by regulating and controlling the reflection phase difference between pattern units, reflection energy is effectively deviated from the main lobe direction of a radar receiver, and therefore the reflection signal intensity of a target in a radar detection system is reduced.

The invention provides a temperature-controlled shape memory alloy helical antenna capable of automatically unfolding and a control method, and belongs to the technical field of antennae, and the antenna comprises a helical radiation unit which is made of a shape memory alloy material and is of a multi-circle helical winding structure; the edge of the metal reflection unit is warped upwards to form an annular reflection cavity, and the metal reflection unit is used for enhancing the directivity and radiation gain of the spiral radiation unit; the supporting rod is of a multi-section coaxial nested structure, is vertically mounted in the center of the metal reflection unit and is used for providing stable axial support in the contraction and expansion process of the spiral radiation unit; the dielectric disc is mounted between the supporting rod and the spiral radiation unit; the metal via hole structure penetrates through the dielectric disc and is used for connecting a coaxial cable and the radiation structure to form a complete feed path; and the impedance matching arm structure is used for connecting the feed path and the spiral radiation unit and adjusting the impedance matching relation between the feed path and the spiral radiation unit so as to realize impedance continuity and radio frequency matching.

The invention provides a multi-sensor data fusion method and system based on an intelligent pod. According to the method, a radiation data flow of an intelligent pod multispectral sensor in an electromagnetic interference field is collected; based on the data, the quantitative attenuation coefficient of the radiation value of each wave band in the interference field is calculated by using a radiation transfer equation. And generating a directional beam of the phased-array antenna by using the coefficient, and scanning a target area to obtain echo data. And finally, performing joint sparse representation on the original radiation data stream and the target echo data to generate a fusion result. The invention discloses multi-sensor data fusion based on an intelligent pod. According to the method, the anti-interference wave beam scanning target is dynamically generated by quantifying the attenuation of electromagnetic interference on radiation of each wave band, and the sensing performance of the intelligent pod in a complex electromagnetic environment is improved by combining the joint sparse representation and fusing the multi-source data.

The invention discloses a semiconductor defect detection method and device, and the detection method comprises the steps: controlling the bright field illumination and the objective magnification, and obtaining the surface microstructure morphology of a to-be-detected sample; determining the process type of the sample to be detected based on the surface microstructure morphology, and automatically determining dark field illumination light intensity parameters of at least two groups of dark field light sources according to a preset mapping relation between the process type and the dark field illumination light intensity parameters; according to the tissue morphology of the sample, at least two dark field light sources with different incident angles are controlled to carry out dark field illumination on the sample to be detected from different directions, and scattered signal images corresponding to different dark field angles are obtained through at least two detectors respectively; and analyzing defect information of the to-be-detected sample based on the scattered signal images at the dark field angles. The detection method can be adaptive to defect detection of different process sheet types, can effectively improve the detection precision of defect diversity and directivity, improves the detection signal-to-noise ratio, and efficiently detects multiple different types of defects at the same time.

[Problem] To provide a transmission-type metasurface plate and a variable directivity antenna that make it possible to reduce loss in a transmission line and reduce costs by standardizing components compared to the prior art. [Solution] This transmission-type metasurface loading antenna comprises a transmission-type metasurface plate and an antenna section arranged parallel to the transmission-type metasurface plate. The transmission-type metasurface plate has a plurality of transmission elements, and near-plane waves incident from one surface are converted in one plane by the transmission-type metasurface plate into directional electromagnetic waves having directivity in a predetermined direction. The transmission elements transmit the incident near-plane waves with a predetermined phase difference. The transmission-type metasurface plate has transmission elements with different predetermined phase differences. The antenna section is a plane wave antenna that emits near-plane waves.

The invention relates to a method for testing and calibrating sensitivity directivity of a Fabry-Perot sensor in transformer oil. According to the method, sensitivity response values under different conditions are obtained by adjusting the distance and the angle between the Fabry-Perot sensor and a sound source. The testing step comprises the steps of setting an initial frequency and a spacing, adjusting an angle and a distance, recording response values under various conditions, and drawing a sensor sensitivity graph through normalization calculation. According to the calibration method, the standard microphone is adopted for comparison test, and the attenuation coefficient is combined for calibration, so that the sound pressure sensitivity accuracy of the Fabry-Perot sensor is ensured. The invention provides an efficient and reliable test and calibration scheme, the application effect of the Fabry-Perot sensor in the transformer oil can be remarkably improved, the accuracy is high, and the method is suitable for a complex environment.

The invention discloses a three-unit leaky-wave antenna array structure based on a dielectric ridge parallel plate waveguide, which comprises the following steps: S1, designing a three-unit array structure based on the coupling characteristic of the dielectric ridge parallel plate waveguide, and feeding a two-port array antenna in parallel by a probe; and S2, according to the product theorem of a directional diagram, determining the gap design of the three units according to the relationship between the gap size and the leakage amount, so as to design a scanning beam meeting the requirements of narrow lobe and high gain. The leaky-wave antenna array structure with the narrow beam and high gain characteristics is provided for the requirements of high signal strength and strong anti-interference performance in a long-distance point-to-point communication system, the antenna can provide better directivity and higher communication quality, and meanwhile it is guaranteed that the antenna has the advantages of being compact in structure and small in size; therefore, the method can be applied to wireless energy transmission systems such as a satellite communication system, a radar system and the Internet of Things.

The invention provides terminal equipment. The terminal equipment comprises a metal floor, a radiation branch knot and a feed source, the radiation branch knot is adjacent to and parallel to the preset edge of the metal floor, the projection of the radiation branch knot on the preset edge of the metal floor is located in the preset edge, and the radiation branch knot comprises at least one connecting part connected with the preset edge of the metal floor; the feed source is electrically connected with the radiation branch knot and is used for exciting the radiation branch knot to generate excitation current conducted along a first direction, so that the preset edge of the metal floor generates floor current, and the direction of the floor current of a first area corresponding to the radiation branch knot in the preset edge of the metal floor is a second direction; the direction of floor current in a second area in the preset edge of the metal floor is a first direction, the second area is adjacent to the first area, and the second direction is opposite to the first direction; the radiation branch comprises a main branch whose electrical length is 1 / 2 of the wavelength corresponding to the preset frequency band. Due to the current distribution, the directivity coefficient after far-field radiation electric field vector superposition is reduced, and the omni-directivity of the antenna is improved.

The embodiments of the present disclosure disclose a low-frequency vibrator unit, an antenna component, and a base station. A vibrator arm is provided to bend towards the bottom, and a director is provided with a window corresponding to an extension branch. Therefore, in an aspect, the vibrator arm occupies less space, such that more low-frequency vibrator units may be arranged in the same space. In another aspect, the window provided in the director reduces influences thereof on a high-frequency vibrator unit below and improves a cross-polarization ratio of the antenna component, such that signal space directivity of the antenna component is stronger. In yet another aspect, the antenna component occupies less space in the base station.

The invention relates to the technical field of optical systems, in particular to a light beam directivity deviation correction method and system. The method comprises the following steps: acquiring a light spot centroid position offset signal of a light source beam in the camera unit; according to the light spot centroid position offset signal, decoupling control is carried out through a target coupling matrix, and a driving voltage value of the fast steering mirror unit is obtained; the target coupling matrix is used for indicating a coupling coefficient relationship between the displacement change of the fast reflecting mirror unit and the position change of light spots in the camera unit; and based on the driving voltage value, controlling each fast reflecting mirror in the fast reflecting mirror unit to rotate around the respective axis so as to correct the directivity deviation of the light beam of the light source. According to the invention, by introducing the target coupling matrix, the coupling relation of light spot centroid change in the camera caused by angle change of the reflector in the horizontal and pitching directions is successfully eliminated, the problem that the other kind of error rises when a certain kind of error is adjusted is avoided, and accurate control is realized.

A short-distance communication method, an electronic device and a communication system relate to the technical field of communication. The method is applied to a first device configured with a screen, and the first device can obtain a digital sequence capable of indicating N signals based on to-be-sent information and display N frames of first images on the screen. Wherein the N frames of first images correspond to the N frames of second images respectively, the N frames of second images are images displayed on a screen of the first equipment under the condition that the screen communication function is not started, and visual perception results of the user on the N frames of first images and the N frames of second images are the same. The change rule of the color information of the N frames of first images is related to the change rule of the N signals. According to the method, a user of the first equipment does not perceive the operation, the second equipment with a camera shooting function scans the N frames of first images and demodulates to obtain the to-be-sent information of the first equipment, the operation is simple, the directivity is good, and the user experience can be improved.

The invention relates to a non-Lambert surface emissivity inversion method, belongs to the technical field of infrared optical measurement and radiation modeling, solves the technical problems of low precision and poor model stability of non-Lambert surface emissivity inversion, and comprises the following steps: measuring original radiation intensity of a non-Lambert surface of a to-be-tested material in different emergent directions; converting the original radiation intensity into directional reflectivity; on the basis of the generalized Lorentz function, diffuse reflection background items are superposed, and a physical prior model is constructed; physical constraint is carried out on the physical prior model parameters; the parameter residual network generates a parameter field, and the parameter field is input into the optimized physical prior model; and carrying out hemispherical integration, and converting the directional reflectivity into directional-hemispherical emissivity. The device and the method are used for infrared thermal imaging measurement, material radiation characteristic characterization and engineering detection in a complex environment.