14results about How to "Optimization range" patented technology

The invention provides a large plane wave generator based on a periodic rectangular reflector antenna array. The large plane wave generator comprises the periodic rectangular reflector antenna array, a rectangular reflector antenna array mounting bracket, N paths of equipower distribution networks, N amplitude-stable and phase-stable cables and a microwave signal source, the periodic rectangular reflector antenna array is vertically mounted on the rectangular reflector antenna array mounting bracket and is connected with the N amplitude-stabilized and phase-stabilized cables, the N amplitude-stabilized and phase-stabilized cables are connected with the N paths of equipower distribution networks, and the N paths of equipower distribution networks are connected with the microwave signal source. By optimizing the amplitude and phase distribution of the feed source array antenna, the equal electric field intensity and phase on the radiation aperture are realized, so that quasi-plane waves are formed on the radiation aperture of the rectangular reflector antenna unit. And the N rectangular reflector antenna units are periodically arranged, so that a large plane wave is formed on the radiation aperture of the periodic rectangular reflector antenna array.

The invention belongs to the technical field of remote detection acoustic logging migration imaging, and particularly relates to a high-precision iteration reverse time migration method and system for remote detection acoustic logging. The method comprises the following steps: collecting remote detection acoustic logging data, and processing the remote detection acoustic logging data to obtain reflected wave actual measurement data; performing remote detection reverse time migration processing on the reflected wave actual measurement data to obtain an initial imaging result; establishing a wave equation based on the initial imaging result, and solving the wave equation to obtain reflected wave prediction data; obtaining residual data according to the reflected wave prediction data and the reflected wave actual measurement data; and carrying out wave field back propagation by taking the residual data as a geophone source, constructing an imaging gradient and obtaining an imaging result. According to the method, the reverse time migration is used for replacing Kirchhoff migration and F-K migration commonly used in remote exploration acoustic logging actual data processing, vertical speed change in a logging observation system can be better adapted, and low-dip-angle fracture-cavity migration homing is achieved.

The application provides a broadband high-efficiency circularly polarized low-profile folded transmission array antenna, and relates to the field of antennas and microwave technology.The transmission array antenna comprises a feed source, a reflection array surface and a transmission array surface; the transmission array surface is arranged by a plurality of transmission units; each transmission unit comprises a transmitting patch; the transmitting patches are arranged according to a target rotation angle; the target rotation angle is an angle corresponding to the case that the transmission phase of each transmission unit is set to be the same as the first compensation phase of each transmission unit; the reflection array surface is arranged by a plurality of reflection units; each reflection unit comprises a polarization twist patch; the polarization twist patch comprises a pair of symmetrical curved sections and a connecting part connecting the two curved sections; the radii of the two curved sections are arranged according to a target radius; the target radius is a radius corresponding to the case that the reflection phase of each reflection unit is set to be the same as the second compensation phase of each reflection unit.The transmission array antenna has the advantages of high aperture efficiency and wide bandwidth.

This invention discloses a highly hydrophilic organic solvent reverse osmosis membrane, its preparation method, and its applications. The organic solvent reverse osmosis membrane comprises a cross-linked polyimide porous support layer, a polyamide separation layer, and a surface grafting layer. The surface grafting layer is formed by the amidation reaction of D-glucosamine with residual acyl chloride groups on the surface of the polyamide separation layer via its primary amino group. This invention utilizes a D-glucosamine / ethanol solution to modify the surface of the nascent polyamide membrane, grafting D-glucosamine through a secondary interfacial reaction to avoid hydrolysis of residual acyl chloride groups, while simultaneously introducing a large number of hydroxyl groups onto the membrane surface. The prepared membrane exhibits significantly enhanced hydrophilicity, greatly increasing the permeation flux of polar organic solvents while maintaining a high solute rejection rate. The preparation method of this invention is simple, low-cost, and easy to scale up, showing broad application prospects in the field of polar organic solvent separation and recovery.

The invention belongs to a sum-difference network. In order to solve the technical problem that in the existing sum-difference network structure, each module is connected by a cable, which increases the difficulty of debugging, a dual circular polarization sum-difference network is provided. The network comprises a first dielectric plate, a first adhesive plate, a second dielectric plate, a second adhesive plate, a third dielectric plate, a third adhesive plate and a fourth dielectric plate which are stacked in sequence. Both sides of the first dielectric plate, one side of the second dielectric plate close to the second adhesive plate, one side of the third dielectric plate close to the second adhesive plate and both sides of the fourth dielectric plate are printed with a metal grounding structure. A left-handed sum-difference network structure is printed on a surface of the second dielectric plate close to the first adhesive plate, and a right-handed sum-difference network structure is printed on a surface of the third dielectric plate close to the third adhesive plate. A feeding hole is provided in the left-handed sum-difference network structure on the second dielectric plate, and mutually interpenetrating feeding through holes are provided on the second adhesive plate, the third dielectric plate, the third adhesive plate and the fourth dielectric plate at positions corresponding to the feeding hole.

The utility model relates to the field of microwave communication, and specifically relates to a circuit for improving broadband ping-pong local oscillator output amplitude consistency. Comprising a first attenuator, a programmable frequency divider, a first filter, a first amplifier, a second attenuator, a second filter, a second amplifier and a third filter which are sequentially connected end to end, the input end of the first attenuator is connected with the output end of the ping-pong local oscillator; and the programmable frequency divider is configured to be in a 1 frequency division mode and is used for carrying out amplitude stabilization processing on the signal output by the first attenuator. According to the invention, the consistency and stability of the output amplitude are significantly improved. The circuit design is simplified, the debugging difficulty is reduced, and the overall performance of the system is improved, so that the system is more suitable for the requirements of a modern microwave communication system.

The application relates to the technical field of radio frequency antennas and electromagnetic super surface, and particularly discloses an orbital angular momentum super surface based on an ITO conductive layer and an implementation method, wherein the super surface is composed of a plurality of transmission type super surface units arranged in a two-dimensional array, each transmission type super surface unit comprises a horizontal parallel rectangular grating, four layers of transparent glass substrates and a vertical parallel rectangular grating which are sequentially and layerwisely arranged, the upper surfaces of the second and fourth layers of transparent glass substrates are provided with square frame structures, the upper surface of the third layer of transparent glass substrates is provided with a square frame and a modified I-shaped resonance unit; the rotation angle of the modified I-shaped resonance unit in each unit is adjusted according to the phase compensation value required by each transmission type super surface unit, so that a composite phase distribution is formed on the aperture surface of the two-dimensional array. The application has the advantages of optical transparency, wideband phase control capability, polarization conversion capability and multi-beam orbital angular momentum beam generation capability, and is suitable for intelligent glass, transparent window communication and multi-dimensional multiplexing wireless communication scenes.

The utility model relates to the technical field of medical apparatus and instruments, especially to a compound motion's ultrasonic osteotome and ultrasonic operating handle, including sword stem and the sword head connected in sword stem front end, the sword stem includes the handle section and transition section gradually from back to front, and the transition section includes amplitude section and the extension section connected in amplitude section front end, the sword stem and the sword head form the suction passage of axis extension, the suction passage can be used for connecting negative pressure equipment to enable the front end of sword head to attract medium, the extension section is evenly opened with a plurality of twist grooves on the circumference, the extension direction of twist groove is consistent with the included angle of extension section axis after the outer wall of extension section is unfolded, and its beneficial effect is that under the action of twist groove, the sword stem not only can reciprocate axially after being connected with ultrasonic transducer, but also can twist axially, and further, the cutting efficiency is greatly improved. Through setting the angle as the consistent form, the twist balance and twist amplitude can be optimized, and further, the cutting effect of the ultrasonic osteotome is further improved.

The present invention belongs to the field of optoelectronic materials, and specifically discloses a reversible light / magnetic / pressure responsive cyclic trimer dynamic organic framework material and its preparation and application. The present invention also discloses a preparation method and application method of the reversible light / magnetic / pressure responsive cyclic trimer dynamic organic framework material. The compound of the new structure described in the present invention has excellent properties and has highly sensitive and highly responsive optical, magnetic and fluorescent response effects under stimulation.

The application relates to an ultra-wideband circularly polarized Vivaldi antenna, which comprises a rotationally symmetric antenna and a feed network; the rotationally symmetric antenna is arranged on the feed network; the rotationally symmetric antenna comprises four Vivaldi antenna units, the four Vivaldi antenna units are orthogonally arranged in sequence, and are fixedly connected with the feed network; each Vivaldi antenna unit comprises a radiation arm, a first ground plane and a substrate; the radiation arm and the first ground plane are arranged on a first surface of the substrate, and a first side of the radiation arm is connected with the first ground plane; the first ground plane of a latter Vivaldi antenna unit is connected with a second side of the radiation arm of a former Vivaldi antenna unit, and serves as a second ground plane of the former Vivaldi antenna unit. The application adopts a half-mode form of the Vivaldi antenna, the antenna has a symmetrical and stable radiation pattern and a compact aperture size through structural multiplexing of the ground planes of the antenna units; and the antenna has good circular polarization performance in combination with the feed network which has good amplitude and phase responses.

The invention relates to the technical field of radar signal processing, in particular to a particle swarm optimization-based MTD filter design method, which comprises the following steps of: S1, obtaining a Doppler center frequency range and a normalized half width according to a radar type and a clutter type so as to obtain a constraint condition, obtaining filter information according to the constraint condition and the global pilot vector matrix; s2, designing a fitness function according to the nonlinear function and a hard coding threshold; and S3, designing a filter according to the fitness function, and iteratively updating the filter according to a main lobe width dichotomy to obtain optimal filtering. According to the method, the linear and nonlinear multi-parameter fitness function is constructed, so that the optimal design is realized on the premise of meeting the requirements of stopband attenuation, null depth and clutter band width. The main lobe width is subjected to dichotomy iterative optimization, so that higher robustness in different clutter environments is realized, the design efficiency of the MTD filter is improved, the main lobe broadening of the filter is reduced, and the gain loss of the filter is reduced.

The invention relates to an unmanned boat path tracking method and electronic equipment, which introduce tracking error, tracking error change rate and speed into the line of sight guidance law, solve the problem that the unmanned boat generates a drift angle under the interference of the external environment, resulting in a decrease in path tracking accuracy, and improve the oscillation amplitude and number of times in the adjustment process; the invention introduces speed limit in the path tracking process, improves the tracking accuracy and safety of the unmanned boat in the turning process; a controller adopts multi-PID switching control based on T-S fuzzy model, and uses a differential evolution algorithm to respectively adjust a group of optimal PID parameters at each typical working speed of the unmanned boat, so that when the speed of the unmanned boat changes in a large range, multiple controllers can switch smoothly, ensuring better tracking control performance at each typical working speed; compared with other evolutionary algorithms such as genetic algorithms, the differential evolution algorithm has a fast convergence speed and is relatively stable, and repeated operations can converge to the same solution.

The invention discloses a Butler matrix applied to a multi-port amplification network. The Butler matrix comprises a plurality of narrow-side coupling 3dB directional couplers and a plurality of wide-side coupling 3dB directional couplers which are mutually cascaded, the narrow-edge coupling 3dB directional coupler comprises a first narrow-edge waveguide and a second narrow-edge waveguide, each of the first narrow-edge waveguide and the second narrow-edge waveguide comprises two ports, and the first narrow-edge waveguide and the second narrow-edge waveguide are connected through at least one narrow-edge coupling slot. The first narrow-edge waveguide and the second narrow-edge waveguide are in mirror symmetry in the horizontal direction along the connecting line; the broadside coupling 3dB directional coupler comprises a first broadside waveguide and a second broadside waveguide, the first broadside waveguide and the second broadside waveguide respectively comprise two ports, and the first broadside waveguide and the second broadside waveguide are connected through at least one broadside coupling slot. And the first broadside waveguide and the second broadside waveguide are in mirror symmetry along the connecting line in the vertical direction. Due to the integrated design, unnecessary waveguide conversion is avoided, and on the basis of ensuring the performance, the size is small and the weight is light.

This invention discloses a method for optimizing a radome for a wide-beam antenna, comprising: constructing a simulation model of the antenna based on a prototype; constructing a simulation model of an initial radome based on preset parameters; setting an initial rectangular aperture above the simulation model of the initial radome; performing electromagnetic simulation calculations on the simulation models of the antenna and the initial radome to obtain the amplitude and phase curves of the initial rectangular aperture; adjusting the parameters of the initial rectangular aperture based on a first optimization objective function, the amplitude and phase curves of the initial rectangular aperture to obtain an optimized rectangular aperture; projecting the optimized rectangular aperture onto the surface of the simulation model of the initial radome to divide the simulation model of the initial radome into an absorbing region and a transmitting region; filling the transmitting region with transmitting material and the absorbing region with absorbing material to obtain the simulation model of the optimized radome; and fabricating the radome based on the simulation model of the optimized radome.