204 results about "Space power" patented technology

A novel, high-efficiency, extremely light-weight, inflatable refractive solar concentrator for space power is described. It consists of a flexible Fresnel lens, flexible sides, and a back surface, together enclosing a volume of space which can be filled with low pressure gas to deploy the concentrator on orbit. The back surface supports the energy receiver/converter located in the focal region of the Fresnel lens. The back surface can also serve as the waste heat radiator. Prior to deployment, the deflated flexible lens and sides are folded against the back surface to form a flat, low-volume package for efficient launch into space. The inflatable concentrator can be configured to provide either a line focus or a point focus of sunlight. The new inflatable concentrator approach will provide significant advantages over the prior art in two different space power areas: photovoltaic concentrator arrays and high-temperature solar thermal conversion systems. Photovoltaic concentrator arrays using the new inflatable lens will be much lighter than prior space concentrator arrays. In addition, for photovoltaic concentrator arrays, the new inflatable lens will eliminate the need for a fragile glass superstrate to support the lens, substantially improving robustness of the lens. Solar thermal concentrator arrays using the new inflatable lens will be much lighter than prior art space concentrators which used parabolic mirrors. In addition, for solar thermal applications in space, the new inflatable lens will eliminate the need for high surface accuracy, which has been a significant problem for prior art concentrators.

The invention provides an integrated millimeter wave active phased-array antenna. The integrated millimeter wave active phased-array antenna is reliable in performance, ensures that the number of chips can be reduced, and reduces cost. According to the technical scheme, an antenna bearing layer is integrally connected to a feed network through an antenna array surface and a TR assembly; micro-strip patches of the antenna array surface are arranged below the antenna bearing layer according to a rectangular grid array and are connected with power amplifier chips of the TR assembly according to a 8*8 array scale, and every four power amplifier chips are connected with a four-channel integrated phase shifter to constitute a 2*2 sub-array circuit to be integrally connected with the feed network downwards; a radio frequency signal is input to a power dividing network through the feed network and is disseminated into four paths of radio frequency signals through a plurality of four-channel integrated phase shifters, and the radio frequency signals are input into corresponding power amplifier chips, are transmitted to the micro-strip patches and are transmitted; sixteen four-channel integrated phase shifters and sixty-four power amplifier chips are controlled by control signals through a low-frequency signal network to finish radio frequency signal space power synthesis and beam scanning.

A rotor for an electrical generator and a generator incorporating such a rotor, the rotor consisting of a central hub, a radially spaced concentric rim portion with rotor magnetic elements mounted upon it, and a plurality of elongate tension members extending generally between the hub and the rim, maintained substantially in tension so as to maintain the rim substantially in compression. The hub is rotatably driven by an axially spaced power drive means such as a wind or marine current turbine.

The invention relates to a MMAOP framework applicable to a terahertz radar and communication system. The implementation mode that a multiplier, a mixer, an array, the quasi-optics and a parabolic antenna are combined is adopted for the MMAOP framework, an all-solid high-power terahertz radiation source is obtained, and meanwhile the MMAOP framework is applicable to the terahertz radar and communication system. A receiving link and a transmitting link of the framework are both obtained in an all-solid mode, and thus the MMAOP framework is good in repeatability and can be integrated and be smaller conveniently. According to the framework, the output power of the terahertz source is raised with an array space power synthesis method, and thus the expansibility is good; a small array can be adopted first to acquire medium output power, as the technology improves, the number of arrays is gradually increased, the output power of a single array element is raised, and thus the radiation power is raised.

A linear light fixture, including a longitudinal base adapted to mount on a flat surface, spaced power connectors with electrical contacts secured to the base, and a reflector secured to the base and extending longitudinally in the direction of the surface when the base is mounted to a surface. A replaceable light emitting element includes a rigid circuit board having a front surface and a back surface, a plurality of LEDs mounted on the front surface of the circuit board, a heat sink mounted to the back surface of the circuit board and adapted to conduct heat from the circuit board and LEDs, and first and second circuit board connectors projecting from one of the circuit board sides. The circuit board connectors are spaced apart so as to simultaneously snap-fit in the first and second power connectors, respectively, to selectively provide power to the circuit board through the electrical contacts.

The invention provides a large-scale MIMO beam space multicast transmission method with optimal energy efficiency, which mainly comprises the following steps: a cell base station configures a large-scale antenna array, generates a large-scale beam set by beam shaping to cover the whole cell, and carries out multicast communication with a user on the generated beam. The base station estimates the statistical channel state information of each user according to the received user uplink detection signal, and performs optimal beam space power allocation according to the statistical channel state information. Among them, the proposed energy-efficient beamspace power allocation algorithm mainly utilizes Dinkelbach transform and deterministic equivalence principle, and obtains the global optimal energy-efficient beamspace multicast power allocation matrix by iteratively solving a series of convex optimization problems. And with the movement of users, the statistical channel state information between the base station and each user changes. The base station obtains the statistical channel state information according to different application scenarios, and dynamically implements the optimal energy-efficient multicast power allocation in the beam space.

The invention discloses a power-dividing horn antenna and an array thereof for space power synthesis. The power-dividing horn antenna is composed of a power distribution radiation port, a matching transition section, and a waveguide feeder sequentially seamlessly connected; the power distribution radiation port is composed of a hollow rectangular waveguide and a waveguide feeder. It consists of a shaped metal wedge located in the middle of the wide side of the hollow rectangle, and the shaped metal wedge divides the aperture of the hollow rectangular waveguide into two identical parts. The power splitting horn antenna array used for spatial power combining is composed of at least two power splitting horn antennas closely arranged. When the power splitting horn is used alone, due to the improved electromagnetic field distribution on the aperture, it can obtain higher gain than the ordinary horn antenna of the same aperture. The power splitting horn antenna array avoids grating lobes when the size of the antenna array is increased, effectively Increase the caliber of the space power combining antenna, increase the gain of the space power combining antenna, and improve the efficiency of power combining.

The invention provides a novel broadband radial curve gradient ridge space power distribution/synthesizer. The novel broadband radial curve gradient ridge space power distribution/synthesizer comprises coaxial curve impedance conversion structures, N paths of impedance gradient radial ridge arrays and rectangular waveguide arrays; each path of impedance gradient radial ridges comprise curve impedance gradient structures and gradient rectangular coaxial internal conductors; the rectangular internal conductors are connected with standard coaxial internal conductors, and signal transmission is realized in non-standard rectangular waveguide; electromagnetic signals are input by the standard coaxial internal conductors, then the signals enter an expanded waveguide disk through the curve gradient coaxial internal conductors, and the signals are distributed into N paths of the coaxial internal conductors at the same amplitude and phase by the radial curve gradient ridge arrays and the coaxial conversion structures; the distributed signals are output by the standard coaxial internal conductors for realizing the distribution and syntheses of the N paths of signals. The power distribution/synthesizer is wide in working frequency bandwidth, high in output power, low in power consumption, high in amplitude-phase consistency, large in the number of the power distribution/synthesis paths, compact in structure and convenient to apply.

The invention discloses an MIMO (multi-input multi-output) radar waveform synthesis method based on space-time joint optimization. The method mainly solves the problem that existing methods are poor in autocorrelation property of air domain composite signals under the condition of guarantee of space power distribution of transmitted waveforms. The method includes the steps: determining a correlation matrix of a transmitted waveform according to actual demands; generating an initial constant modulus waveform matrix; determining an interested observation azimuth angle, namely an azimuth angle needing improvement of the autocorrelation property; designing a constant modulus waveform phase matrix by means of sequential quadratic programming; and synthesizing a constant modulus waveform matrix according to the phase matrix. The air domain property of the transmitted waveforms and the time domain autocorrelation property of specific direction signals are considered during waveform design, the synthesized waveforms are in expected space power distribution and have fine time domain autocorrelation property in the interested direction, and the method can be used for waveform design of MIMO radar in stages of target detection and tracking.

The invention discloses a space power divider/combiner. A disc-shaped air column lens adopts a metal disc-shaped parallel plate waveguide comprising an upper metal disc layer and a lower metal disc layer; upper and lower inner surfaces of the metal disc-shaped parallel plate waveguide adopt arc surfaces; a long side of a standard rectangular waveguide is perpendicular to the metal discs of the disc-shaped air column lens; a transition waveguide is in a horn mouth shape; one end of the transition waveguide is connected with the standard rectangular waveguide; the other end of the transition waveguide is intersected with the disc-shaped air column lens; an output end surface of a U-shaped output array is rectangular; an input end surface of the U-shaped output array adopts a semicircular arc surface matched with the disc-shaped air column lens; and a plurality of parallel metal baffles which are perpendicular to the metal discs of the disc-shaped air column lens are arranged in the U-shaped output array. The space power divider/combiner has high output power, wide frequency band and high combined efficiency, and has the advantages that the structure is simple, the processing accuracy requirement is low, the manufacture cost is low, the expansibility is high, heat emission is easy to realize, and the like.

The invention discloses a millimeter wave space power divider and a millimeter wave space power combiner. The millimeter wave space power divider comprises a standard rectangular waveguide, a transition waveguide, an air lens and an output array, wherein the air lens comprises two metal semicircular discs which are symmetrically arranged in the vertical direction, the metal semicircular discs reserves a required part and removes a part to which signals cannot reach according to the principle of an improved Maxwell fisheye lens so as to present a semicircular disc shape, the lower surface of the metal semicircular disc located at the upper layer and the upper surface of the metal semicircular disc located at the lower layer are concave arc-shaped surfaces with the same size, a smooth curve of each concave arc-shaped surface is decided by the principle of the improved Maxwell fisheye lens, and the concave arc-shaped surfaces of the two metal semicircular discs respectively form an improved Maxwell fisheye lens. The millimeter wave space power divider has the advantages of high output power, wide frequency band, simple assembly, small structural size, low cost and ability of realizing miniaturization.

The invention discloses an arrival direction estimation method based on minimum mutual entropy spectrum analysis. The method comprises steps that: a signal is emitted by an emission energy transducer; echo of an emitted sound signal is received by a reception hydrophone array; modeling of a plane wave model is carried out for the received echo signal, and processing is carried out by utilizing the minimum mutual entropy spectrum estimation method to acquired a space power spectrum estimation value; analysis on the space power spectrum estimation value is carried out, and a corresponding abscissa of the peak value is an estimation angle of the object. According to the arrival direction estimation method, through one-time data sampling employing the array with relatively a few array elements, a spectrum analysis result with high resolution can be acquired. A cepstrum method is further employed, a convergence speed of a minimum mutual entropy spectrum analysis algorithm can be improved through reverse FFT transformation. Compared with a routine space spectrum estimation method, the arrival direction estimation method provided by the invention has advantages of higher resolution and smaller operand, and real-time processing on the array signal can be carried out. The algorithm is independent of the pre-estimated source number, and relatively good tolerance, relatively high resolution and an extremely low sidelobe level are realized.

The invention discloses a distance measuring method for a power line, which comprises the following steps: (1) acquiring sequence images of the power line and a crossover object under the power line to form a stereoscopic image pair; (2) extracting an image space power line in the stereoscopic image pair; (3) determining spatial coordinates of a power line point; (4) using a plumb line track method to search whether the crossover object exists in a certain distance under the power line point, and calculating the coordinates of the crossover object when the crossover object exits; and (5) according to the coordinates of the crossover object and the power line point, calculating the vertical distance of the crossover object and the power line point. The method can accurately identify the power line in the image and measure the spatial coordinates of the power line, automatically judge whether the crossover object exists in the safe distance under the power line, measure the vertical distance between the power line and the crossover object at the lower part in real time, discover the potential safety hazard, and ensure the smoothness and safety of a power supply line.

An electrochemical cell having two or more diffusion bonded layers, which demonstrates a high degree of ruggedness, reliability, efficiency and attitude insensitiveness, is provided. The novel cell structure simplifies construction and operation of these cells. Also provided is a method for passive water removal from these cells. The inventive cell, as well as stacks made using these cells, is suitable for use in applications such as commercial space power systems, long endurance aircraft, undersea power systems, remote backup power systems, and regenerative fuel cells.

The invention belongs to the field of new energy and space power supplies and relates to a one-time corrosion process for multi-junction gallium arsenide solar batteries. Partition grooves/scribing grooves are produced through a single corrosion liquid by one-time corrosion. The process comprises a photo-resist protection process and a one-time corrosion process. Partition groove corrosion is a key process for producing integrated bypass diodes. The process is characterized in that graphs are produced through a photo-resist masking process, and the substrate layer is corroded through the single corrosion liquid by one-time corrosion; front epitaxial layer and back substrate materials can be corroded simultaneously through one-time corrosion; the partition grooves and scribing grooves are produced by one-time corrosion simultaneously; solar batteries can be protected against space damage such as 'hot spot' and the like by the bypass diodes produced through processes of one-time corrosion, electrode evaporation, alloy and the like. The scribing grooves are produced by one-time corrosion and are cut directly, so that the battery electric performance caused by the edge mechanical damage due to direct cutting of the scribing grooves can be prevented.

The invention relates to the technical field of digital notch, in particular relates to a power frequency digital notch device and method based on frequency track. The power frequency digital notch method based on the frequency track comprises the following steps: singly collecting power frequency signals and adaptively regulating, analyzing and comparing; and if a comparison result exceeds a set threshold, regulating the coefficient of a power frequency notch filter, and notching a human signal so as to obtain a filtering result, and outputting the filtering result. According to the method, the space power frequency signal can be correctly acquired in real time, the notch is timely traced, the interference of the power frequency signal on a useful signal is effectively attenuated, and the problems that digital notch attenuation amplitude is in lack because of frequency fluctuation of power frequency and the like are solved. In a clinic application, through the device and the method, a wave form is smooth, which is beneficial to correct diagnosis, thereby avoiding misdiagnosis.

The invention provides a method for extracting the dimension characteristics of an underwater target based on space similarity. The method comprises the following steps of calculating the conventional beamforming space power spectrum of a distribution source based on ripple signals of the underwater target, utilizing point target space power spectra obtained by a space similarity theory and a classic theory to perform space similarity measurement, and finishing classification and recognition according to previously established space measurement threshold standards so as to extract the dimension characteristics of the underwater target. The method for extracting the dimension characteristics has the advantages that the influence of irradiation angles, base arrays and target distance parameters on the dimension characteristics is considered so as to conform with the visual recognition of the eyes to the dimensional target; three space similarity measurement methods are adopted in the process of extracting the dimension characteristics of the target, the defects of a single method are overcome, and the extracting and recognition reliability of the dimension characteristics of the underwater target is improved; and the conventional beamforming (CBF) method is used for calculating the space power spectrum of the distribution source target, and the space similarity calculation methods are relatively simpler and favorable to engineering realization.

The invention provides a robust beam forming method based on a steering vector and space power estimation, so as to improve the robustness of random errors on an incoming wave direction and to realizeaccurate signal steering vector estimation under the condition of interference in a main lobe of a beam. The invention provides a signal plus interference covariance matrix reconstruction algorithm,which introduces a correlation coefficient to serve as a signal subspace selection criterion, reconstructs a sampling covariance matrix signal plus interference subspace, and performs alternate projection in combination with a covariance matrix containing a signal subspace and obtained by signal angle interval discrete sampling, so as to perform the accurate signal steering vector estimation and to design a robust adaptive beam former under the condition of interference in the main lobe of the beam.