82results about How to "Conformal" patented technology

The invention discloses a broadband bionic yagi antenna with a low radar cross section and mainly solves the problems of high radar cross section and relatively narrow band width in the traditional yagi antenna. The antenna simulates an opposite phyllotaxis plant leaf structure and comprises a director (2), a radiating element (3), a parallel strip line (4), a reflector (5) and a coaxial conversion joint (6). The radiating element (3) is of an oval structure, the director (2) simulates a feather-shaped leaf structure, and the reflector (4) is a rectangle patch with a tooth-shaped structure. The radiating element (3) is printed on a top layer and a bottom layer of a double-layer medium material plate (1) and respectively connected with an inner core and an outer core of the coaxial conversion joint (6) by the parallel strip line (4); the director (2) is printed on the top layer of the double-layer medium material plate (1); and the reflector (4) is printed between two layers of the double-layer medium material plate (1). The broadband bionic yagi antenna with the low radar cross section has the advantages of wide frequency band and good invisibility performance and can be used on an invisible target carrier.

The invention discloses a sky-wave beyond visual range radar adaptive space-time joint interference-resistant method which inhibits interference by comprehensively utilizing two methods of adaptive beamforming and interpolation and compensation after a time domain is eliminated and achieves the purpose of making up for each other deficiencies through reasonable scheduling strategies. The transient interference entering a side lobe is resisted by utilizing the adaptive beamforming of a space domain, and the transient interference entering a main lobe is inhibited through the interpolation and the compensation after the time domain is eliminated, therefore compensating errors caused by time domain elimination and beam distortion caused by main lobe interference are prevented; and a diagonal loading amount which is in proportion to interference strength is formed for the non-transient interference entering the main lobe through interference space distribution information, therefore the strong main lobe interference is prevented from causing the serious distortion of the shapes of adaptive beams. The invention is established on the basis of a dimension-reducing beam space adaptive beamforming method, thereby greatly reducing the amount of signal processing calculations; and concrete steps are seen in an attached figure. The invention is not limited to a sky-wave beyond visual range radar system, can be widely applied to large-sized phased array radars of multiple types and has popularization and application value.

The method manages to solve the problem of high resolution and high arithmetical complexity existed in normal approach in order to reach main beam-forming and be capable of making real time process for multi high strength interferences. It comprises: a beam selector is used to make channel selection control in order to select several channels under interference; sending the signals from the selected channels into a process branch circuit; the selected signals firstly are converted down to 1.0 GHZ and are sent to band filter; the signals outputted from the filter are sent to the phase detector, and negative frequency spectrum is removed from the those signals, and the real signals are converted into the complex signals. The algorithm used in current system is implemented by using the correction of amplitude and phase, high resolution angle measurement and self-adaptive zeroing process.

The invention belongs to the field of signal processing, and discloses a large dimension reduction four-channel mainlobe sidelobe interference-resisting method. The method comprises steps: according to data received by all subarrays, a sum beam, a pitch difference beam, an azimuth difference beam, a dual-difference beam and multiple sidelobe interference beams after dimension reduction are formed respectively; interference-resisting weights of the pitches and beams are obtained, and interference-resisting weights of the azimuths and the beams are obtained; according to the dual-difference beam, the pitch difference beam and the azimuth difference beam, an auto-covariance matrix for the dual-difference beam, a cross-covariance matrix for the dual-difference beam and the pitch difference beam and the cross-covariance matrix for the dual-difference beam and the azimuth difference beam are obtained; and the interference-resisting weight of the azimuth difference beam and the interference-resisting weight of the pitch difference beam are solved; and the azimuths, the beams and the azimuth difference beam after interference resistance along the pitch direction are acquired, and the pitches, the beams and the pitch difference beam after interference resistance along the pitch direction are acquired; and sum difference angle measurement is adopted to obtain the target direction.

The present invention relates to a compression resin packaging method and a compression resin packaging device for electronic components. The present invention simplifies the compression resin packaging device which integrally packages the electronic components on a large-scale substrate and resin in a package, and raises precision (deviation) of thickness of the package. Sheet-like resin having a shape-preserving property carried on a release liner is supplied into a lower mold cavity, mold assembling is performed for upper and lower molds, residual resin in the lower mold cavity is leaded into a residual resin containing part at the outside world through a gap between the upper mold and the lower mold, so that in a resin packaging step, a gap between a bottom surface of the lower mold cavity at a final position of the mold assembling of the upper and lower molds and an electronic component installing surface in the large-scale substrate is set to be equal to the gap of the package thickness for performing resin packaging for the electronic components of the large-scale substrate, by further compressing the fused resin material in the lower mold cavity under the conditions of low speed and low pressure, the electronic components on the large-scale substrate are packaged integrally with the resin.

The present invention provides a radar pulse compression output minor lobe inhibition method based on windowing processing. The method comprises the steps of: performing pulse compression processing of a known echo signal of a radar, outputting a pulse compression signal A, loading a window function to the pulse compression signal at a frequency domain, performing inverse Fourier transform to allow the pulse compression signal to be equal to an ideal output signal on a time domain, and solving the window function, wherein the ideal output signal is namely a pulse compression signal at a set position for minor lobe inhibition; performing pulse compression processing of the radar echo signal to be inhibited, loading the window function to the pulse compression signal to perform processing, and obtaining an ideal output result of minor lobe inhibition. The radar pulse compression output minor lobe inhibition method is low in calculation complexity, can achieve shape maintenance of the width and the shape of the main lobe, can flexibly control the minor lobe features of a pulse compression result, and can be deeply controlled.

The invention discloses a multiband antenna with a cross-band scattering suppression function. The antenna comprises at least one low-frequency sub-antenna and at least one high-frequency sub-antenna,wherein the low-frequency sub-antenna and the high-frequency sub-antenna work in different frequency bands; the low-frequency sub-antenna comprises at least one radiation arm. The radiation arm is divided into a plurality of arm sections in the arm length direction of the radiation arm, and every two adjacent arm sections are connected through a decoupling structure. The decoupling structure is composed of a thin metal connecting line and at least one metal branch knot, wherein the metal branch knots are connected with the thin metal connecting lines; the two ends of the thin metal connectingwire are electrically connected with the two arm sections respectively; one end of each metal branch knot is electrically connected with the corresponding arm section, and the other end of each metalbranch knot is disconnected, so the high-frequency induction current on the metal branch knots can counteract the high-frequency induction current on the fine metal connecting wires in a reverse direction, the scattering interference of the low-frequency sub-antenna to the high-frequency sub-antenna is suppressed, and a stable high-frequency radiation pattern is obtained.

The invention discloses a robust space-time adaptive processing method for super-low-altitude target detection by a moving platform radar, which mainly solves the problem of performance loss caused as a training sample is polluted by a mirror false target generated by the super-low-altitude target in a multipath environment. The method comprises steps: 1, optimized frequencies of four constraint points are designed; 2, a Doppler domain constraint condition is built; 3, an airspace constraint condition is built; 4, an optimal weight vector is solved; and 5, output data are obtained. Through replacing an equality constraint in the previous method by an inequality constraint in the Doppler domain, an amplitude-phase joint constraint in the airspace is used for replacing an amplitude constraint in the previous method, main lobe shape preserving is realized on the premise of not losing degree of freedom, robustness of the space-time adaptive processing method is realized, the performance of super-low-altitude target detection by the moving platform radar is improved, and the method of the invention can be used for detecting the super-low-altitude target by the moving platform radar.

The invention discloses an array radar self-adaptive interference resistance method based on beam shape-preserving. The problem that a beam main lobe formed in the prior art is uneven and is not suitable for multi-point constraint is solved. The method comprises the steps that 1 the sampling data of an array radar detection target are acquired; 2 the steering vector of three optimized constraint points is designed; 3 a mathematical model is constructed according to the steering vector in step 2; 4 the constraint vector of the mathematical model is designed, and the self-adaptive weight vector of the mathematical model is solved according to the constraint vector; and 5 the self-adaptive weight vector is used to suppress an interference signal to acquire output data. According to the invention, linear constraint is used in a number of points of a main beam; by arranging a phase response value, target signal phase matching is realized; a detection performance is prevented from the influence of interference; by setting the main beam amplitude response is 1, the main beam can evenly cover an observation area; the target detection performance of an array radar is improved; and the method can be used for multiple-target detection.

The invention provides a sum and difference beam forming method based on a space-time adaptive processing radar and mainly aims at solving the problem of main lobe response distortion in the prior art. The method comprises the steps of firstly, inputting sampled data of a space-time adaptive processing radar in a signal processor; secondly, acquiring a sample covariance matrix through estimation based on the sampled data; thirdly, designing the angles and Dopplers of five constraint points; fourthly, designing sum beam weight vectors according to the sample covariance matrix and the five constraint points; fifthly, designing space domain difference beam weight vectors according to the sample covariance matrix and the five constraint points; sixthly, designing time domain difference beam weight vectors according to the sample covariance matrix and the five constraint points; seventhly, acquiring output signals of sum beams, space domain difference beams and time domain difference beams according to the sampled data and the beam weight vectors. Through amplitude-phase combined constraint, derivative constraint and multiple zero constraints, the method realizes sum and difference beam main lobe maintenance of a space-time adaptive processing radar and can be used for target tracking.

The invention provides a semi-dull low-elongation viscose fiber as well as a preparation method and application thereof. The viscose fiber is obtained by sequentially performing soaking, grinding, squeezing crushing, kneading, directional polymerization reduction, yellowing, dissolving, filtering, defoaming, curing, spinning drawing and after-treatment on a pulp raw material, and has an index system that the dry fracture strength is more than or equal to 3.10cN/dtex, the wet fracture strength is more than or equal to 1.60cN/dtex, the strength needed for generating 5% of the elongation in a wet state is more than or equal to 0.55cN/dtex, the dry elongation at break is 12-14.5%, and the wet fracture extensibility is 16.0-21.0%. The semi-dull high-strength viscose fiber provided by the invention is prepared by virtue of technical innovation, is a novel fiber variety which has an index system different from that of ordinary viscose fibers and Modal fibers, shows high and strong fiber characteristics, and also shows skin affinity stronger than that of cotton fibers, so that the viscose fiber can effectively replace the existing differentiation viscose fiber, the development and the industrial upgrading of downstream novel textiles can be promoted while the processability of the downstream process of the viscose fiber is improved, and the semi-dull low-elongation viscose fiber can be well applied to the field of production of jean fabrics.

The invention relates to a low-profile high-gain polarization self-adaption high-definition television receiver which comprises a radiation layer, a resonant cavity layer, an upper feed layer, a coupling layer and a lower feed layer. A radiator is arranged on the radiation layer and both the upper feed layer and the lower feed layer conduct feed on the radiation layer through the coupling layer. When the upper feed layer and the lower feed layer conducts feed independently, vertically polarized waves and horizontally polarized waves are excited out respectively by the radiation layer. When the upper feed layer and the lower feed layer conduct feed synchronously, left-handed circularly polarized waves and right-handed polarized waves or elliptically polarized waves are excited out through control over the amplitude and the phase of waves of the upper feed layer and the lower feed layer. According to the low-profile high-gain polarization self-adaption high-definition television receiver, two layers of feed networks are adopted so that horizontally polarized waves and vertically polarized waves can be excited out independently, and the purposes that gain of an antenna is guaranteed and meanwhile polarization self-adaption of the antenna is realized are achieved; a square radiation horn is the guarantee of high gain of the antenna and high efficiency of the antenna.

The invention discloses an antibacterial wet tissue for a human body and a preparation method of the antibacterial wet tissue. The antibacterial wet tissue for the human body is obtained by soaking ablocky non-woven fabric into antibacterial liquid; the non-woven fabric comprises the following raw materials: viscose and polyester; the antibacterial liquid is prepared from the following raw materials: a degerming agent, a preservative, glycerol, an antibacterial agent, a natural preservative, olive oil, citric acid and deionized water; the antibacterial wet tissue for the human body is good inantibacterial performance and high in safety; according to a non-woven fabric slitting device for slitting the blocky non-woven fabric, a process of automatically slitting a large non-woven fabric into a plurality of blocky non-woven fabrics is completed, the automation degree is high, and the working efficiency is improved; the non-woven fabric slitting device can be cut into different quantities of blocky non-woven fabrics with different sizes, and is wide in application range and high in practical performance; and according to the non-woven fabric slitting device, little noise pollution isgenerated during working, the influence of noise on the body health of workers is avoided, and interference on life and work of surrounding people is avoided.

The invention discloses a broadband dual-polarized electromagnetic transparent antenna which is used for suppressing cross-band scattering interference among multiband antennas. The antenna is mainly characterized in that four oscillator arms are designed on a dielectric substrate, at least one nested opening resonance groove is etched in each oscillator arm, each nested opening resonance groove is composed of an inner opening resonance groove and an outer opening resonance groove, and the scattering suppression frequency band of the antenna is determined according to the size of the nested opening resonance grooves. Two relatively narrow scattering suppression frequency bands can be combined into a wide scattering suppression frequency band by adjusting the sizes of the inner opening resonance groove and the outer opening resonance groove so that broadband scattering suppression is realized, and in the scattering suppression frequency band, and scattering currents on the oscillator arms are mainly distributed near the nested opening resonance grooves in opposite directions. And a scattering field generated by the reverse scattering current can be self-counteracted so that scattering interference generated by the broadband dual-polarization electromagnetic transparent antenna on an antenna working in an action frequency band of the broadband dual-polarization electromagnetic transparent antenna is effectively inhibited, and an electromagnetic transparent effect is further realized.

A synthetic resin container, the container has a waist that divides its main body into upper and lower sections. There are reinforcement ribs higher than the bottom of the groove and lower than the surface of the main body of the container. The main body of the container may also be provided with transverse ribs for reinforcement, which have a recessed portion that is at the same height as the surface of the container, or has only a slight difference in height from the surface of the container. A plurality of indentations concentrating centripetally can also be formed on the container main body, which defines a concave polyhedron wall area inclined toward the concentrating point of the indentations.