42results about How to "Improve error tolerance" patented technology

The invention discloses a full-duplex transceiver in a flat fading environment and a method for canceling self-interference. The method includes dividing received signals by a coupler to obtain a channel I of signals and a channel Q of signals at a receiving end; respectively transmitting the channel I of signals and the channel Q of signals into a channel I receiving channel and a channel Q receiving channels which are structurally symmetrical with each other; canceling the self-interference in a simulated manner in the receiving channels by the aid of multipliers, adders and a radiofrequency interference reconstruction module; digitally canceling the self-interference at the rear end via a digital cancellation unit; transmitting delay estimation parameters and channel estimation parameters to a delay module, the radiofrequency interference reconstruction module and the digital cancellation unit; circularly canceling the self-interference until the optimal cancellation effect is realized. Phase difference between the channel I of signals and the channel Q of signals is 90 degrees. The delay estimation parameters and the channel estimation parameters are generated by a channel / delay estimation unit. The full-duplex transceiver and the method have the advantages that the complexity of the structure of the transceiver can be effectively decreased by the aid of self-mixing and zero-intermediate-frequency technologies, the cost can be saved, and the size of the full-duplex transceiver can be reduced; requirements of self-interference signals on the precision of delay devices can be greatly reduced, and the devices can be selected conveniently and can be implemented easily; the receiving channels are independent from each other, are structurally symmetrical with each other and can be integrated easily.

Genomic sequence matching and alignment techniques are disclosed. In one embodiment, an index of a reference sequence is constructed that represents all transitions from a single l-mer prefix to multiple m-mer suffixes. This index data structure may take a variety of forms, including an array or a tree. The base position of each transition from l-prefix to m-suffix is recorded in k-bit masked form. The positions data structure may take a variety of forms as well, including an array or a tree. The l-prefix, m-suffix and k-position index is used for rapid assessment of similarity between a query and a reference genomic sequence by means of a table of local hits.

The invention provides a space deployable mechanism comprising multiple identical folding deployable units which are arranged symmetrically left and right. Each folding deployable unit comprises two identical vertical rods arranged longitudinally, two identical first chord members, two identical second chord members and two identical third chord members, wherein the starting ends of the two first chord members are connected to the upper ends of the two vertical rods through rotating pairs respectively, the tail ends of the two first chord members are mutually connected through a rotating pair to form a V-type rod, the middles of the two second chord members are mutually connected through a rotating pair to form a scissor form mechanism, the starting ends of the two second chord members are connected to the lower ends of the two vertical rods through rotating pairs respectively, the starting ends of the two third chord members are connected to the lower middle parts of the two vertical rods through rotating pairs respectively, and the tail ends of the two third chord members are connected to the tail ends of the two second chord members through rotating pairs respectively. The space deployable mechanism is good in deployable performance, high in rigidity and error containment and low in machining and manufacturing requirement.

The invention discloses a high-efficiency grating coupler based on an intermediate-refractive-index waveguide material. The specific structure is a substrate, a lower cladding layer, an intermediate-refractive-index material layer, an insulating layer, an amorphous silicon grating, and an upper cladding layer from bottom to top. The invention also discloses a preparation method of the high-efficiency grating coupler based on the intermediate-refractive-index waveguide material. The method comprises the following steps of: first preparing a waveguide lower cladding layer and the intermediate-refractive-index material layer on the substrate; implementing a waveguide device in the intermediate-refractive-index material layer; growing an insulating layer and amorphous silicon on a surface of asample; transferring a grating structure to an electron beam glue or a photoresist layer by an electron beam or an ultraviolet exposure, and forming a grating pattern after development; and then transferring the grating structure to the amorphous silicon grating by an etching process; and finally, removing the electron beam glue or the photoresist layer, and growing the upper cladding layer. Theinvention has the advantages of simpler process steps, lower cost and higher tolerance of errors.

The invention relates to self-aligning packaging structure for a micro-electromechanical system (MEMS) device and a manufacture method thereof. The self-aligning packaging structure for the MEMS device comprises a cover plate and a load bearing substrate. An MEMS structure is arranged on the load bearing substrate, an accommodating groove is arranged in the recessed cover plate, the MEMS structure penetrates into the accommodating groove, and a getter is arranged at the bottom of the accommodating groove. The outer side of the cover plate corresponding to a groove opening of the accommodating groove is provided with a cover plate bonding positioning protrusion, and the cover plate is provided with a cover plate bonding layer. A substrate bonding positioning protrusion is arranged on the load bearing substrate, a bonding positioning groove is arranged between the substrate bonding positioning protrusion and the MEMS structure, and a substrate bonding layer is arranged on the surface of the load bearing substrate. The cover plate bonding positioning protrusion extends into the bonding positioning groove and then corresponds to and is matched with the bonding positioning groove so as to achieve self aligning, the cover plate bonding layer is in corresponding contact with the substrate bonding layer, and the cover plate and the load bearing substrate are integrally connected after the cover plate bonding layer and the substrate bonding layer are bonded. The self-aligning packaging structure for the MEMS device is simple and compact in structure and can meet the high-precision packaging requirement of the MEMS, increase the area of the bonding region and improve the reliability and leakproofness of package.

The invention provides a solar photovoltaic system, which comprises a photovoltaic battery and a sun tracker. A round optical condensation component for condensing light is arranged in front of the photovoltaic battery and comprises an incident face and an emergent face; the emergent face is provided with a plurality of sawtooth concentric rings which are connected in sequence; the radial widths of the sawtooth concentric rings are equal, and each sawtooth concentric ring comprises a first surface which is vertical to the emergent face and a second surface which is arc-shaped and aspherical; one end of the second surface is connected to the emergent face, and the other end of the second face is connected with the other end of the first surface; and each point coordinate on the second surface of the Nth sawtooth concentric ring is shown as (x,y) which meets a specific formula, and a light evener is arranged between the photovoltaic battery and the optical condensation component. The focal spots formed by the solar photovoltaic system are smaller in size and stable in formed position, the condensation ratio is high, the light spots are influenced by band numbers slightly, and the light spots received by the photovoltaic battery are even, thus the integral photoelectric conversion efficiency and flexibility of the photovoltaic system can be improved.

The invention discloses a space target inverse synthetic aperture radar imaging parameter design method. The method comprises the following steps: a target running track and zenith-passing time are calculated; imaging center time is set; an azimuth angle, an elevation angle, imaging on and off time and a target slope distance are calculated; a redundant slope distance and an initial transmitting pulse width are set; a PRF is selected; whether Dc exceeds an upper limit is judged; an echo window length and Dr are calculated; whether the Dr exceeds the storage and transmission capability is judged; the echo starting time is calculated; beam pointing is adjusted; antenna gains and echo signal intensity are calculated; MGC is set; and imaging is carried out. The motion characteristics of the to-be-imaged space target and the limitations of the radar system are thoroughly considered, STK software is combined, the problems of insufficient calculation precision of target motion parameters, radar beam pointing and system parameters in the traditional space target inverse synthetic aperture radar imaging parameter design are solved, and through a mode of combining mechanical scanning and electric scanning, the beam pointing needed for space target inverse synthetic aperture radar imaging is realized, and the realization cost and the complexity are reduced.

The invention discloses a two-stage sub-wavelength grating silicon-based light polarization beam splitting rotator based on asymmetric coupling. Silicon dioxide is used as a substrate, and air is usedas an upper cladding to break vertical symmetry; a polarization beam splitting rotator main body is formed by using a silicon waveguide; the silicon waveguide is divided into three parts: a waveguide1 is a primary coupling sub-wavelength grating waveguide, the characteristic size of the waveguide is equivalently expanded, and the manufacturing tolerance is further increased; the waveguide 2 is atwo-stage conical etching waveguide, the first-stage conical etching and the waveguide 1 complete phase matching to achieve polarization rotation, and the second-stage etching recovers the thicknessof the waveguide to participate in second-stage coupling; and the waveguide 3 is a secondary sub-wavelength grating waveguide and is used for carrying out secondary coupling filtering on the residualTM0 polarization mode. According to the polarization beam splitting rotator, multi-stage coupling is adopted, a multi-stage filtering structure achieves the high polarization extinction ratio and thelarge manufacturing tolerance under the compact structure, and the polarization beam splitting rotator has important application in optical communication and photoelectric signal processing.

The invention provides an OCT conjugated mirror image removal device and method capable of eliminating multicolor errors. The device includes a CCD camera, a ruling grating, an upper computer, a piezoelectric ceramic, a beam splitter, a sample, an objective lens, a GRIN fiber collimator, and a super radiance light emitting diode. Through adoption of the device and the method, signal reconstructionis performed on an interference signal, fixed phase shift amount is corrected by utilizing the wavelength of a broadband light source, and a set of varying phase shift amount is calculated, and because the corrected phase shift amount is error-free, the reconstructed interference signal is not affected by the multicolor errors of the broadband light source. Rapid Fourier transform is performed onthe interference signal to eliminate a conjugated mirror image, and the detection depth of a system is doubled. Without increasing the amount of data of traditional phase shifting methods, the effectof the multicolor errors of the broadband light source is completely removed, and the error tolerance of the system is improved.

The invention discloses a novel motor train unit bogie replacing unit which comprises a main body framework, a supporting head mechanism and a ballast bed mechanism. A supporting head can be driven byitself along a supporting head walking rail so as to be aligned with a motor train unit lifting point. The ballast bed mechanism comprises a ballast bed and a lifting mechanism; the ballast bed is provided with a rail; and the lifting mechanism drives the ballast bed to reciprocate in a height direction so that the rail is selectively in butt joint with the fixed rail to form a continuous rail oris in butt joint with a negative working layer. When the lifting mechanism drives the ballast bed to be in a lifting state, the rail and the fixed rail are in butt joint to form the continuous rail.When the lifting mechanism drives the ballast bed to descend from the lifting state to a first descending state, the rail is in butt joint with the negative working layer, and the supporting head lifts a carriage. Synchronous lifting is easy to control, the unit is suitable for replacement operation of motor train unit bogies of all types, and an underground space can be effectively utilized for maintenance operation.

The invention provides a low power consumption UART serial port system, which comprises a data transceiver module, a baud rate detection module, a memory module, an interrupt logic control module and a peripheral bus module, and is characterized in that the data transceiver module comprises a receiving end and a transmitting end, an input interface of the receiving end receives external data, and an output interface of the transmitting end receives the external data; an output interface of the receiving end is connected with the Baud rate detection module, external data is subjected to Baud rate detection through the Baud rate detection module, an output end of the Baud rate detection module is respectively connected with the memory module and an input interface of the transmitting end, the memory module is connected with the peripheral bus module, and the transmitting end is connected with the peripheral bus module. The output end of the peripheral bus module is connected with external equipment, an interrupt logic control module is further connected between the storage module and the peripheral bus module to generate interrupt, data receiving and sending can be carried out on low-frequency clock signals, baud rate automatic detection can be carried out, and system power consumption is low.

The invention relates to a copper-oxygen-based high-temperature superconducting single-photon detector and a preparation method thereof. The single-photon detector comprises a substrate, a copper-oxygen-based high-temperature superconducting micron wire and a dielectric film reflector which are sequentially arranged from bottom to top, a nanopore array is arranged in the copper-oxygen-based high-temperature superconducting micron wire, and metal nanoparticles are arranged on the copper-oxygen-based high-temperature superconducting micron wire. The single-photon detector works at the liquid nitrogen temperature of 77K, the use and storage cost of liquid nitrogen is greatly lower than that of liquid helium equipment, and the use of the single-photon detector is facilitated. The detector adopts a working mode of back incidence, Meanwhile, the local enhancement effect of the metal nanoparticles is utilized, so that the light absorption rate of the device is improved, and the detection efficiency of incident light in each polarization direction is enhanced on the whole. The preparation method of the copper-oxygen-based high-temperature superconducting single-photon detector is low in working cost and simple in preparation process.

The invention relates to a method for imaging a space target by an on-orbit SAR satellite, which fully considers the high-speed relative motion characteristics of the on-orbit SAR satellite and the space target to be imaged and the system limitation, and combines STK software to solve the problems that the relative motion of the SAR satellite and the space target is complex, the geometrical relationship is difficult to determine and the imaging parameter precision requirement is high in the space target imaging process. By selecting a proper pulse repetition frequency, effective reception of the echo of the space target to be imaged is ensured, and interference of emission pulse, sub-satellite point echo, ground scene echo and the like is avoided at the same time. Through the mode of combining satellite attitude maneuver and antenna electric scanning, the beam pointing required by the SAR satellite for space target imaging is realized, the implementation cost and complexity are reduced, and the application range of the on-orbit SAR satellite is expanded.

The invention discloses a plastic packaging mould and a plastic packaging method. The plastic packaging mould comprises a pedestal, a mould cavity frame group and inserts, wherein the pedestal is equipped with an accommodating cavity; the mould cavity frame group comprises a plurality of mould cavity frames which can be replaced mutually, and the dimensions of at least two mould cavity frames among the mould cavity frames which can be replaced mutually are different; each mould cavity frame can be accommodated in the accommodating cavity, and is detachably connected with the pedestal; the inserts are accommodated in the mould cavity frames and are adaptive to the inner walls of the mould cavity frames, so that the surfaces, close to sides of the accommodating cavities, of the inserts and the inner walls of the mould cavity frames define plastically packaged mould cavities. The plastic packaging mould can be used for processing plastically packaged products of different needs, and reduces the manufacturing cost of the plastically packaged products; and a machine table utilization rate of the plastic packaging mould is further increased, so that production efficiency and productive efficiency of the plastic packaging mould are improved.

The invention provides a design method of an on-chip photonic device based on appearance contour regulation and control. The design method comprises the steps of determining functions, a design targetand a design area of the device; discretizing the appearance contour of the device in the design area into a plurality of points; restoring the appearance profile curve of the device on the basis ofthe discrete points in the previous step by using an interpolation method, and replacing the original appearance profile curve; and performing iterative search on the discrete points by using a searchalgorithm, and changing the appearance contour in the design area until the device meets the design target. By adopting the technical scheme of the invention, the design method and the design dimension of the on-chip photonic device are expanded, the requirements of the on-chip photonic device on wider bandwidth, higher error tolerance and smaller size are met, the design goals of more functions,higher standards and smaller size are achieved, and the convergence rate is greatly improved.

The invention discloses a rotating speed sensor, which comprises a voltage-stabilized power supply, an oscillator and a detection circuit, wherein a power supply input end of the oscillator is coupled to an output end of the voltage-stabilized power supply, and the oscillator is provided with a coil which is arranged opposite to a metal conductor; the oscillator stops oscillating when the distance between the metal conductor and the coil is less than a critical threshold, so that the voltage-stabilized power supply is facilitated to reduce current of an output end in a step manner; and the detection circuit is applicable to detecting an electric signal corresponding to a current value of the output end of the voltage-stabilized power supply. A control unit is coupled to the detection circuit, and is applicable to determining whether the oscillator stops oscillating or not according to the electric signal and recording a pulse at each time when the oscillator is determined to stop oscillating.

The invention relates to an LED (Light-Emitting Diode) light source installing structure, in particular to an LED light source drilling-free rapid fixing structure. The structure comprises a shell, wherein the back of the shell is provided with a driving power supply, the shell is internally provided with an LED base plate, and the shell comprises a component mounting part and side shell parts; the side shell parts extend downwards from two side of the component mounting part, the upper surface of the component mounting part is provided with one or more driving power supply fixing grooves which are concave inwards, and the driving power is fixedly arranged in the driving power fixing groove by virtue of a fastening piece; the lower surface of the component mounting part is provided with an LED base plate fixing groove, and the inner wall of the side shell part on one side is provided with a clamping slot. The tolerance fault tolerance is greatly improved by virtue of the LED light source drilling-free rapid fixing structure, the LED base plate is matched with the clamping slot by virtue of the single fastening piece, so as to realize fixing; the mounting difficulty is lowered, the cross-ventilation is convenient, the better heat dissipation is realized, the fastening piece can be arbitrarily selected and arranged in the mounting groove, so that the LED light source drilling-free rapid fixing structure is capable of providing convenience for splicing and position adjusting of the LED base plate.

The invention discloses an integrally forged iron golf club head and its manufacturing method, comprising the head body, the weight components and a cover. A connecting recess is arranged inside the head body. The weight components are installed in the connecting groove and the material of the weight components is composite ceramic with a density of 1.3 to 3.5 g / cc. The cover is welded to the meshing groove of the head body and the weight components are sealed by the head and the cover without any gap. The density of the integrally forged iron head is lower in the center area than that in thesurrounding area. So with bigger error margin, larger hitting area, and louder hitting sound, the player can feel better.

The application discloses a device for generating an excitation signal of a crystal oscillator, a chip, and a crystal oscillator excitation system. The device for generating an excitation signal of acrystal oscillator comprises: a clock signal generator and a sigma delta modulator, wherein the clock signal generator is connected to the sigma delta modulator; the clock signal generator is used forgenerating a clock signal of a target frequency, and the target frequency is a frequency of a preset range centered at twice the target resonance frequency; and the sigma delta modulator is used forgenerating quantization noise based on the clock signal, and the quantization noise is used as an excitation signal. With the embodiment of the application, on the premise of achieving fast start-up,the degree of crystal oscillator that can be used by the chip is reduced, and the error tolerance to the manufacturing process of the device is increased.

The invention discloses a cascaded waveguide-based end face coupler with a double-step structure. The cascaded waveguide-based end face coupler is formed by cascading a first waveguide and a second waveguide, introducing a ridge waveguide on the first waveguide; the end surfaces of the ridge waveguide and the first waveguide are flush to form an initial input end surface of the coupler, and the initial input end surface is completely matched with the size of the AWG output waveguide; the length of the ridge waveguide is equal to that of the first waveguide, the width of the ridge waveguide is gradually reduced from the initial input end face to the output end face, and the projection of the ridge waveguide on the first waveguide is an isosceles trapezoid; the second waveguide adopts a regular conical structure which is three-dimensionally reduced from the waveguide input end face to the waveguide output end face, the size of the second waveguide input end face is matched with that of the first waveguide output end face, the size of the output end face of the second waveguide is completely matched with that of the ridge waveguide of the photoelectric detector, and the first waveguide, the second waveguide and the ridge waveguide are of a double-step structure. The coupler is small in size, low in loss, high in error tolerance and capable of achieving efficient coupling of waveguides of different sizes.

A shaping signal control method with a high clock cycle error rate, so that the voice coil motor is driven by the following input control signals sent by the actuator: up a step to reach the second height at time T0; down a step to reach the first height at T1 time ;Up one step reaches the second height at time T2; up one step reaches the third height at T3 time; descends one step to reach the second height at T4 time; ascends one step to reach the fourth height at T5 time; ascends one step at T6 Reach the fourth height at any time; descend one step to reach the third height at T7; ascend one step to reach the fourth height at T8, ascend one step to reach the fifth height at T9, descend one step to reach the fourth height at T10, Go up a step to reach the fifth height at T11 and reach the target position. The invention can prevent the output of the motor from generating large jitter when the frequency of the motor deviates greatly from the clock frequency, and achieve stability quickly.