Abstract: The present disclosure provides a phase compensation method and apparatus for measuring an array antenna. The phase compensation method includes: an operation S1 of exporting measured far-field directivity patterns of a first array unit and a second array unit, to establish a coordinate system, so as to determine a spatial geometrical relationship between the first array unit and the second array unit; an operation S2 of determining a wave path difference between the first array unit and the second array unit based on the spatial geometrical relationship between the first array unit and the second array unit; and an operation S3 of performing phase compensation on the second array unit based on the wave path difference.

Abstract: Provided a wave-absorbing impregnation glue liquid, including: two-component epoxy resin, a solvent, a polyether siloxane, and a carbon powder; wherein a mass ratio of the two-component epoxy resin to the solvent is 1:3˜1:5, a mass ratio of the two-component epoxy resin to the carbon powder is 3:1˜6:1, and a mass fraction of the polyether siloxane in the wave-absorbing impregnation glue liquid is 0.05%˜0.2%. A wave-absorbing impregnation glue liquid, a wave-absorbing honeycomb and their preparation methods are further provided.

Abstract: The present disclosure provides a beam synthesis method for measuring an array antenna. The method includes: obtaining a phase, an amplitude, and related distance values of each antenna unit, where the related distance values include a first distance value and a second distance value; calculating a phase directivity pattern of each antenna unit, and compensating the phase directivity pattern of each antenna unit based on the phase and the first distance value of each antenna unit, to obtain a phase error value of each antenna unit; and synthesizing radio frequency signals of a plurality of antenna units based on the phase, the amplitude, the second distance value, and the phase error value of each antenna unit, to obtain an antenna beam.

Abstract: The present invention provides a radome substrate and a preparation method thereof. The radome substrate includes: 5 to 10 parts of polyphenylene ether resin, 70 to 85 parts of ceramic masterbatch, 10 to 15 parts of hollow microbead masterbatch, 1 to 3 parts of a compatibilizer, and 0.1 to 0.3 parts of a lubricant. The radome substrate prepared according to the method provided in the present invention has a high dielectric constant and stress cracking resistance performance.

Abstract: A plate folding and unfolding device and a solar panel structure are provided. The plate folding and unfolding device includes a cam fixed with first plate piece, and a rotating shaft is disposed inside the cam in an axial direction of the cam; a connecting rod, where the connecting rod includes a first end and a second end that are opposite to each other, the first end is connected vertically to the rotating shaft, and the second end is fixed to a second plate piece; a positioning shaft, where the positioning shaft is disposed, on the connecting rod; and an elastic piece, where the elastic piece is disposed on the connecting rod, one end of the elastic piece is connected to the positioning shaft, where a groove that accommodates the positioning shaft is disposed at at least one location of the outer peripheral surface of the cam.

Abstract: The disclosure discloses an absorbing metamaterial, including a plurality of metamaterial units that are periodically arranged, where the metamaterial unit includes: a first loop disposed on a first plane; and a second loop disposed on a second plane, where the first plane is perpendicular to the second plane, so that the first loop and the second loop are orthogonal. According to the foregoing technical solution in the disclosure, wave absorption in a large angle range can be implemented while ensuring wideband wave absorption.

Abstract: The disclosure provides an integrated wave-absorbing and wave-transparent apparatus and a radome. The integrated wave-absorbing and wave-transparent apparatus includes: a wave-transparent structure, including a first substrate and a metal patch unit located on opposite surfaces of the substrate; and a wave-absorbing structure, disposed on the wave-transparent structure and including a first wave-absorbing unit and a second wave-absorbing unit that are perpendicular to each other, where the first wave-absorbing unit and the second wave-absorbing unit each includes: a second substrate; and a plurality of metal sections and a plurality of stop-bands that are located on surfaces of the second substrate, where the plurality of metal sections and the plurality of stop-bands are connected alternately to form an absorption ring, and the metal patch unit is configured to be perpendicular to each of an absorption ring of the first wave-absorbing unit and an absorption ring of the second wave-absorbing unit.

Abstract: Method and device for evaluating the electrical performance of an antenna cover. The method for evaluating the electrical performance of the antenna cover comprises: acquiring electromagnetic parameter information of an antenna and parameter information of an antenna cover; calculating far-field information of the antenna and far-field information of an antenna system on the basis of the electromagnetic parameter information of the antenna and of the parameter information of the antenna cover; and calculating electrical performance parameter information of the antenna cover on the basis of the far-field information of the antenna and of the far-field information of the antenna system.

Abstract: The present invention relates to a smart electronic lock and a suitcase.

Abstract: Provided are a QR decomposition-based detection method and apparatus based on overlapped multiplexing. The QR decomposition-based detection method includes: step S1: obtaining a receive sequence, where the receive sequence is a sequence obtained by encoding and modulating an input signal based on a multiplexing waveform matrix and transmitting the signal through a Gaussian channel; and step S2: detecting the receive sequence by using a QR decomposition algorithm, where step S2 includes: decomposing a foreknown multiplexing waveform matrix into a unitary matrix and an upper triangular matrix; performing matrix multiplication processing on the receive sequence based on the unitary matrix, to obtain a data sequence; and performing layer-by-layer detection on the data sequence based on the data sequence, the upper triangular matrix, and a quantized decision factor.

Abstract: The present disclosure provides an epoxy resin wave-absorbing composite material and a preparation method thereof. The method includes: heating an epoxy resin to 50° C.˜70° C., and adding carbon black, to obtain a mixture of the epoxy resin and the carbon black; heating the mixture of the epoxy resin and the carbon black to 100° C.˜120° C., adding a curing agent, and stirring and dissolving them to obtain a mixture of the epoxy resin, the carbon black, and the curing agent; and adding surface-treated hollow glass microbeads into the mixture of the epoxy resin, the carbon black, and the curing agent, and curing them to obtain the epoxy resin wave-absorbing composite material.

Abstract: The disclosure discloses a controllable wave-absorbing metamaterial including a substrate and a metamaterial unit array layer. Each conductive geometric unit includes a first hollow structure, second hollow structures, and conductive geometric structures. The second hollow structures are respectively extended from four vertices of the first hollow structure, and the conductive geometric structure is disposed between each two adjacent second hollow structures. The first end of the second hollow structure is provided with a varactor diode connected to the conductive geometric structures at both sides, the second end of the second hollow structure is provided with a fixed capacitor and a fixed resistor; the fixed capacitor is connected to the conductive geometric structure at one side, and the fixed resistor is connected to the conductive geometric structure at the other side. Therefore, active adjustment on a wave-absorption frequency band can be implemented, and power consumption is very low.

Abstract: A method and device for acquiring a target object, and a robot are provided. The method includes: acquiring a plurality of frames of continuous images in video images, where each frame of image includes a first target object; acquiring, based on the continuous images including the first target object, a first target image from which a background has been removed; acquiring, based on a distance from a first center point of the first target image to a common boundary, a location of a second target object in the first target image, where the first center point is determined based on a color of the second target object, the common boundary is an overlapping boundary of the second target object and the first target object, and the second target object is included in the first target object; and extracting the second target object based on the location of the second target object in the first target image.

Abstract: A near space aircraft pod, including a pod body and a covering piece, where a heat dissipation part is disposed on the pod body for dissipating heat inside the pod body; and the covering piece is connected to the outside of the pod body in a movable manner, for covering the heat dissipation part or keeping a pre-designed distance from the heat dissipation part. According to the near space aircraft pod provided in the embodiments, the covering piece can adjust a distance from the heat dissipation part in time or cover the heat dissipation part based on a temperature change. Therefore, a heat dissipation speed of the pod can be effectively controlled, so that temperature inside the pod is kept in a proper range, and it is ensured that electronic devices in the pod operate under a good temperature environment.

Abstract: Provided are a directional pattern calculation method and apparatus for a beam pointing adjustable antenna. In the design method, key control factors are quantized, for example, a arrangement and combination modes for a plurality of slot units and wave-controlled codes for conducting and cut-off states of a slot unit, and different combinations of slot units and a far-field directional pattern of a controlled array antenna are evaluated, so that electrical performance indicators of the array antenna can be further evaluated. Weighting calculation is implemented for a directional pattern of a beam pointing adjustable antenna. Key information such as a form of a slot unit and a arrangement and combination modes for slot units can be globally optimized. Optimization on selection, a permutation, a combination, a spacing, and the like of slot units is greatly saved during antenna design, so as to focus on design of a structural form of a slot unit.

Abstract: Provided are a method and device for calculating directional pattern of the beam pointing adjustable antenna. In the method, a scattering parameter of a single slot unit is directly measured, and therefore, operability is strong, and the directional pattern of the beam pointing adjustable antenna is calculated without depending on simulation software. In addition, weighted calculation of the directional pattern of the beam pointing adjustable antenna is realized. Key information such as a form of the slot unit and an arrangement and combination mode of the slot units can be globally optimized.

Abstract: The present invention discloses a frequency spectrum allocation method and apparatus for an overlapped multiplexing system, a storage medium, and a processor. The method includes: determining channel bandwidth for an overlapped multiplexing system, and obtaining first bandwidth for an overlapped multiplexing signal, where the first bandwidth is processing bandwidth for the overlapped multiplexing signal; obtaining second bandwidth other than the first bandwidth in the channel bandwidth for the overlapped multiplexing system; and allocating the second bandwidth to a non-overlapped-multiplexing signal. The present invention resolves a prior-art technical problem that bandwidth occupied by an overlapped multiplexing system is relatively wide but actual processing bandwidth is relatively narrow, causing a waste of frequency spectrum resources.

Abstract: Provided are a processing method, device, and system for an overlapped multiplexing system. The method includes: receiving encoded information output by a transmit end, where the encoded information is information obtained by performing error-correcting code encoding and overlapped multiplexing encoding on input information; decoding the encoded information according to an overlapped multiplexing decoding algorithm, to obtain a first decoding result; performing error-correcting processing on the first decoding result according to an error-correcting code decoding algorithm, to obtain a second decoding result; and outputting the second decoding result.

Abstract: The present application discloses a signal sampling and recovery method and apparatus applicable to an OvXDM system, and the OvXDM system. The method includes: constructing, based on design parameters, an observation matrix ? that is irrelevant to an original signal y, wherein the observation matrix ? is a two-dimensional M*S matrix, S is a length of the original signal y, and M is smaller than S; compressing the original signal y based on a formula Ycs=?Y, to obtain a M*1 compressed signal Ycs, wherein Y is a S*1 column vector that is obtained according to the original signal y; and reconstructing the compressed signal Ycs based on a predetermined algorithm, so as to recover the original signal y. The present application implements accurate recovery of the original signal at a reduced sampling rate, thereby reducing hardware requirements of the system and improving feasibility of the technical solution.

Abstract: The present disclosure relates to the aerospace application field, and provides a method for flying a large balloon. In the method, a constraint apparatus is disposed on a balloon capsule to replace a roller, and the constraint apparatus is released progressively in a release process of the balloon capsule, so that the balloon capsule is released progressively and slowly before rising above a pod. This greatly reduces the impact in a flying process, makes it easier to control a flying status of the balloon capsule, and also makes related operations of onsite staffs simpler and controllable.