45results about How to "Improve engineering realizability" patented technology

The invention relates to a rapid alignment method with high precision for a strap-down inertial navigation system, belonging to the alignment method for the strap-down inertial navigation system. The method comprises the following steps of: collecting an output signal from an inertia measurement component, and obtaining the angular velocity and the specific force information of a vehicle; performing coarse alignment by the strap-down inertial navigation system; performing calculation by the strap-down inertial navigation system; performing precise alignment by the strap-down inertial navigation system; filter outputting and correcting; and finishing the precise alignment. The invention can be used for improving alignment precision and rapidness of the low-cost strap-down inertial navigation system; realizes azimuth alignment; and has the advantages of high feasibility and operability, and low cost.

The invention discloses a design method of a self-adaptive wing profile. Firstly, parameterized description of a selected initial wing profile is obtained with a CST parameterization method, an optimal design variable of local deformation is determined, populations are initialized with a selected optimization algorithm, domination sequencing is performed on the populations under the conditions that the lift-to-drag ratio reaching the maximum when the lift coefficient CL is equal to 0.9 and the maximum bending stress reaching the minimum after change of leading edge camber are taken as optimization objects and non-plastic deformation is taken as a constraint, and finally, an optimized wing profile meeting the terminal conditions is selected. With pneumatic characteristics expected by the wing profile as the design objects, a constraint relation between the self-adaptive wing profile and an original wing profile is established, a reasonable target wing profile can be provided for design of a deformation driving technology, the engineering implementability is improved, and the design optimization efficiency is further improved.

The invention discloses a high-overload-impact-resistant synchronous four-channel folding wing locking and unfolding mechanism and an operation method of the high-overload-impact-resistant synchronousfour-channel folding wing locking and unloading mechanism. The folding wing locking and unfolding mechanism is installed on a rudder and comprises four rudder wings, locking buffering devices and aninitiator thrust cylinder. The four rudder wings are installed on the corresponding locking buffering devices correspondingly and connected with a rudder speed reducer through base output shafts. Theinitiator thrust cylinder is fixed to the center of the rudder, connected with the four rudder wings through locking claws and used for initial folding locking and in-place unfolding of the rudder wings. The high-overload-impact-resistant synchronous four-channel folding wing locking and unfolding mechanism has the features of being simple in structure, good in synchronism, reliable in locking andthe like. The high-overload-impact-resistant synchronous four-channel folding wing locking and unfolding mechanism is suitable for the application field of guided munition folding wings which are large in impact overload, short in unfolding time and high in synchronism requirement.

The invention provides a geostationary satellite imaging navigation and registered orbital motion compensation method. The method includes the following steps: a first step, writing an expression of adesired target point coordinate on an earth ellipsoid corresponding to a preset scanning mirror rotation angle according to a scanning reflective mechanical optical path model of a remote sensing instrument while a satellite is at a nominal fixed point; a second step, calculating a desired scanning mirror rotation angle while the satellite is at an orbital position after drifting and points to aground desired target point; and a third step, using the desired scanning mirror rotation angle to subtract the preset scanning mirror rotation angle to acquire an orbital motion compensation amount.The acquired image and an earth nominal grid image generated by the satellite at the nominal fixed point are consistent, errors are controlled in an indication range, and the research and developmentdifficulty of a system can be lowered, and the realizability of engineering can be improved.

The invention provides a digital television single frequency network radio frequency adapter and a broadband network system thereof. The adapter comprises a programmable module, and a broadband radio-frequency signal FM is subjected to down-conversion filtering to acquire a broadband intermediate frequency signal IF1. IF1 is switched in an intermediate frequency gain control module to acquire a broadband intermediate frequency signal IF2 with constant signal power. A / D conversion is performed to acquire a digital signal DATA1, which is switched in the programmable module to form DATA2=DATA1+delta t according to set time delay. The IF2 is subjected to D / A conversion to become a broadband intermediate frequency signal IF3 having accordant frequency domain with the IF2 and delayed time domain, and then the IF3 is subjected to up-conversion filtering to acquire a delayed broadband radio-frequency signal. The broadband network system is provided with the single frequency network radio frequency adapter. A multipath audio / video program source is processed by a front-end information source processing module, a channel processing module and a small signal broadband synthesizer into a small signal broadband radio-frequency signal FM. A signal chain transmits to each node, the single frequency network radio frequency adapter of each node adjusts the signal time delay and each broadband transmitter amplifies and transmits the signal FM, so the stability and covering effect of the system are improved and the cost is lowered.

The invention provides an underwater array scanning laser imaging device comprising a carrier (1), an electrical module (19) and an imaging module (18), wherein the carrier (1) is the shell of the whole device; the electrical module (19) comprises a lighting laser (15), a combined inertial navigation unit (16) and a control processing unit (17); components of the electrical module (19) are fixed on two sides of an installation plate (22), and fixed with the carrier (1) via the installation plate (22); the imaging module (18) comprises a pitching servo mechanism (5), a rolling servo mechanism (6) and an optical imaging module (14); the optical imaging module (14) comprises an imaging lens (7), a filtering plate (8), a hating imaging sensor (9) and a lighting lens (10); laser emitted by the lighting laser (15) can be transmitted to the lighting lens (10) via an energy transmission optical fiber (11). The device provided by the invention has the characteristics of being miniature, and capable of achieving array scanning under water.

The invention provides a high-order digital filtering system and a high-order digital filtering method. By virtue of time-frequency conversion of a digital signal, parallel data are subjected to multiply-accumulation operation based on a frame form in a frequency domain through response to a filter coefficient frequency domain, so that digital parallel realization of high-order FIR filtering is finished. The fussy realizing way of the traditional parallel digital filtering by virtue of sequence recombination is greatly simplified.

The invention discloses a one-dimensional DOA estimation method based on a specific frequency combination signal. The method includes: transmitting a plurality of signals with specific frequencies, separating corresponding frequency signals from received signals of each array element through a plurality of narrow-band filters with different frequencies to obtain a frequency domain receiving data model, then normalizing a source signal matrix and reconstructing a frequency domain received data matrix, subjecting a uniform physical array to primary expansion to form a virtual non-uniform array,finally performing secondary virtual expansion on the virtual non-uniform array in combination with an existing non-uniform array data covariance matrix processing method, thus finally obtaining a virtual uniform array subjected to secondary expansion, and realizing secondary expansion of the array aperture. Under the condition that a traditional uniform array structure does not need to be changed, virtual expansion of the array aperture is achieved by receiving a plurality of narrow-band signals with specific frequencies and depending on the prior information of frequency proportion, so thatthe estimation precision is improved.

The invention discloses a satellite-borne terahertz ice cloud nadir detector system, which comprises an antenna and scanning subsystem, a multi-frequency-band terahertz receiving channel, a calibration subsystem, a data collecting and processing platform, a control power distribution system and control and signal processing equipment, wherein the antenna and scanning subsystem, the multi-frequency-band terahertz receiving channel, the calibration subsystem, the data collecting and processing platform and the control power distribution system are installed on a detection head part; the controland signal processing equipment is installed on a satellite platform; and the detection head part carries out conical scanning, and observation for a target, observation for a thermal calibration source body and observation for cold air are successively finished in a scanning process so as to realize the scanning imaging of ice cloud and the in-orbit two-point calibration of a detector. A receiving front end design scheme of an offset paraboloid reflector and a quasi-optics feed network is adopted, and conical scanning is carried out through a rotary antenna feeder system to realize the nadirobservation of ice water particles in cloud.

The invention discloses a single reflecting surface compact range device of high cross polarization isolation. The device is mainly composed of a reflecting surface of a single reflecting surface compact range, a feed source and a polarization grid. The feed source illuminates the precise reflecting surface of the single reflecting surface compact range and beforehand collimates and corrects spherical waves into planar waves. To lower shielding of the feed source, an offset feed structure is adopted in geometric layout, while the offset feed layout is the main reason of large cross polarization. The polarization grid is arranged in front of a planar wave silent area of the single reflecting surface compact range, and a silent area range is subjected to polarization filtering and gating, wherein the polarization states of the feed source and the polarization grid are controlled by respective controllers. Polarization and gating of the polarization grid have the advantages of wideband working, can almost completely reflect the polarization component parallel to polarization grid silk, almost completely transmit the polarization component perpendicular to the polarization grid silk and improve the polarization isolation of the single reflecting surface compact range to a great extent with the cost of introducing very small insertion loss. The engineering achievability of compact range system design is improved, and control over the dynamic range of a radio frequency system is improved.

The invention discloses a driven energy absorbing pulling / pressing both-way buffer capable of being repeatedly used, and belongs to the technical field of spaceflight equipment. The device is mainly composed of four parts including an outer barrel assembly, a middle barrel assembly, an inner barrel assembly and a pull barrel assembly, wherein the middle barrel assembly is coaxially arranged in theouter barrel assembly, the inner barrel assembly is coaxially arranged in the middle barrel assembly, and the pull barrel assembly is coaxially arranged on the periphery of the connecting position ofthe outer barrel assembly and the middle barrel assembly. According to the device, through an innovatively-designed aluminum honeycomb resetting mechanism, a mechanical spring resetting device and aratchet one-way locking device are combined with the pulling / pressing both-way buffer based on aluminum honeycomb crushing energy absorbing materials, and the advantages that a traditional driven energy absorbing both-way buffer is simple in structure, small in mass and high in reliability are sufficiently inherited; and the traditional pulling / pressing both-way buffer can be repeatedly used and can be used for repeatedly-used soft landing devices needed for multi-target deep space exploration tasks in future.

The invention discloses a multi-carrier signal vector diversity merging method for resisting frequency selective fading, which comprises the following steps: generating coded modulated data; multicarrier modulation; insert guard interval and cyclic prefix; acquiring a plurality of wireless received signals; remove guard intervals and cyclic prefix operations; multicarrier demodulation; channel equalization of sub-carrier data in frequency domain; solving vector diversity and weight vectors of each received sub-carrier data; vector diversity merging is performed on the equalized multi-channel data; data demodulation; and soft decoding. The invention has the advantages of strong ability of resisting channel frequency selective fading, low algorithm complexity and simple realization, and finally improves diversity merging performance of a multi-channel multi-carrier system.

The invention proposes a self-reference interference alignment system. A cone-like beam is irradiated to an alignment mark, so that the size of a diffraction spot is extended, the manufacturing difficulty of a self-reference interference instrument is lowered, and the engineering implementability of a scheme is improved, wherein a predetermined included angle exists between a normal line perpendicular to a horizontal line and the cone-like beam. Meanwhile, the mark tilts relative to a scanning direction, so that alignment positions of X and Y directions are obtained at the same time by one-time scanning, and the efficiency of alignment is improved.

The invention discloses a method for quickly imaging absorption type defects of a large-aperture reflecting film element based on a photo-thermal imbalance technology. Modulated high-power laser is collimated and expanded to form large-size excitation light spots to irradiate and heat a reflective thin film element, and absorption type defects of a thin film generate periodic modulation temperature distribution on the surface of a sample, so that the reflectivity or transmittance of a defect area is periodically changed. After another low-power laser beam with a certain wavelength is collimated and expanded to form a large-size detection light spot, the large-size detection light spot is irradiated to the same area, irradiated by a heated laser beam, of the reflective film element at a certain incident angle, and the light field distribution of the detection laser beam reflected or transmitted by the film is imaged to a CCD target surface through an optical imaging system to be recorded. And a light field intensity image recorded by the CCD is analyzed to determine the absorptive defect of the irradiated area and the corresponding characteristics thereof. According to the method, the single detection area is greatly increased, and the rapid detection of the absorption type defect distribution of the large-aperture reflection film element becomes possible through scanning.

The invention discloses a non-linear model extraction method of a frequency hopping radio transmitter based on a predistortion table. The method comprises the following steps: acquiring non-linear characteristics of the full-working frequency band of the frequency hopping radio transmitter through a testing platform, adding the non-linear difference of the transmitter between different frequencies on the basis of the traditional amplitude index predistortion table, thereby constructing an amplitude index predistoration table set containing different frequencies; compressing and optimizing the predistortion table set by use of the amplitude non-uniform quantitative technology and the frequency non-linear classification technology to generate a non-linear characteristic model of the comprehensive signal amplitude and the carrier frequency information, thereby realizing the full frequency band non-linear characteristic feature model of the frequency hopping radio transmitter.

The invention discloses a broadband electromagnetic phase-adjustable metasurface structure. A metal structure layer of the broadband electromagnetic phase-adjustable metasurface structure forms a plurality of array units arranged periodically on the surface of a dielectric layer, and each array unit comprises a closed square boundary frame and an electric harmonic oscillator arranged at the center of the boundary frame. The electric harmonic oscillator comprises a cross arranged in the center of the square boundary frame, side lines located on the outer sides of the free ends of the cross and variable capacitance diodes connected between the free ends of the cross and the corresponding side lines. The side length of the boundary line frame is 31 to 39 mm; the side line length of the electric harmonic oscillator is 9-11mm, the line width of the electric harmonic oscillator is 0.5-1mm, the line width of the cross is 1-1.5 mm, the length of the cross is 10-12mm, the inductance of the variable capacitance diode is less than or equal to 0.4 nH, and the initial capacitance value is less than or equal to 0.5 pF. The polarization-independent electromagnetic wave phase wavefront adjustable performance is realized by adopting a symmetrical structure, and the adjustable phase can exceed 320 degrees within the maximum range of 4.8-6.2 GHz.

The invention relates to a power distribution network looped network single-phase earth fault section positioning and distance measuring method that is characterized by comprising the following steps: step 1, extracting phase current data measured by each detection device in a power distribution network looped network line in real time, judging an accurate fault occurrence moment based on the phase current data, and calculating comprehensive positive and negative sequence current of a fault component; step 2, establishing a network structure description matrix based on the line construction and the position of each detection device in the line; step 3, calculating a fault interval in the power distribution network line based on the phase characteristics of the comprehensive positive and negative sequence current of the fault component at each detection device and the network structure description matrix; and step 4, based on the fault line type, the fault interval type and the comprehensive positive and negative sequence current of the head end of the looped network, realizing fault point distance measurement calculation and fault point positioning. The method provided by the invention has the advantages of simple steps, simple calculation and high accuracy, reduces the dependence on a communication environment, can meet the requirement of fault positioning in various different line types, and has high engineering realizability.

The invention relates to a dual-frequency dual-polarized feed assembly in a C frequency band. The transceiving 4 / 6GHz is divided into two frequency bands, a dual-frequency orthogonal modal coupler is utilized to couple 4GHz transmitting signals into signals in four paths, and the phase shift power division characteristic of a bridge power divider and the relationship of four ports of the bridge power divider are utilized to synthesize the signals in the four paths into laevorotatory signals in one path and dextrorotatory signals in one path skillfully; after receiving frequency band signals pass through the dual-frequency orthogonal modal coupler smoothly, the laevorotatory signals and the dextrorotatory signals are divided by a simple dual-circular polarizer, thus realizing the receivingbands and the transmitting bands; and two polarized frequencies in each band are polarized and multiplexed. The feed assembly is compact in the structure and realizes the strictly consistent direction of the receiving band and the transmitting band. An antenna has the high polarization isolation (more than or equal to 30dB) and antijamming capability in the C band, the influence of the passive intermodulation in the antenna is low, and the electromagnetic compatibility between the working frequency bands is good.

The invention provides an efficient discrete Fourier transform method. Reduced DFT (Discrete Fourier Transform) operation and butterfly operation are combined, and the method can realize the DFT operation of any odd point through a way that repeated iteration reduction is combined with a butterfly algorithm; and the method also can realize the DFT operation of any even number point and the odd point obtained after butterfly simplification is carried out through the way that the repeated iteration reduction is combined with the butterfly algorithm. Compared with the traditional DFT algorithm, the efficient discrete Fourier transform method adopts fewer complex multiplication operations so as to greatly lower operation complexity. The algorithm has the advantages of being simple and reasonable in architecture, few in resource expenditure and high in engineering realizability.

The invention discloses a square fuel assembly. According to the square fuel assembly, a guide pipe is coaxially arranged at the center of the square fuel assembly, and a control rod bundle is coaxially arranged in the guide pipe; supporting pipes are coaxially arranged at the four corners of the square fuel assembly and the center points of the four peripheral edges of the square fuel assembly; aplurality of fuel rods are coaxially arranged between a stiff plate and the center of the square fuel assembly. The invention discloses a single-flow supercritical water cooled reactor based on the square fuel assembly. The single-flow supercritical water cooled reactor based on the square fuel assembly comprises a plurality of square channels, the square channels are arranged to be adjacent to one another to form a honeycomb integral structure, and a metal reflecting layer is arranged outside the honeycomb integral structure; the square channels are used for containing the square fuel assemblies. Under the condition of meeting neutron economy, safety and engineering realizability, the design of fuel assemblies of water rods can be canceled, the design of a single-flow reactor core is realized, and the improvement of the economical benefit of fuel management is facilitated.

The invention discloses a method for loading a control rod of a supercritical water-cooled reactor and a structure. The method comprises the following steps: selecting one or more adjacent control rod components as a combined component; fixing the control rod components on the combined component on a control rod driving mechanism; and lifting or downward inserting one or more control rod components by the control rod driving mechanism. The structure comprises the control rod components and the control rod driving mechanism located on a supercritical water-cooled reactor pressure vessel, wherein one or more adjacent control rod components are fixed on the same control rod driving mechanism. According to the invention, the difficulty in designing a top cover of the supercritical water-cooled reactor pressure vessel is reduced, the running management procedure of the control rod components is simplified, and the economical efficiency, safety and engineering realizability of the supercritical water-cooled reactor are promoted.

The invention discloses a supercritical water-cooled reactor control rod loading method and structure. The method is to select a single or multiple adjacent control rod assemblies as an assembly, and fix the control rod assemblies on the assembly to a On the control rod driving mechanism of the platform, the lifting or lowering of the single or multiple control rod assemblies on the control rod driving mechanism is completed through the control rod driving mechanism; the structure includes the control rod assembly and the control rod drive on the supercritical water-cooled reactor pressure vessel mechanism, single or multiple adjacent control rod assemblies are fixed to the same control rod drive mechanism. The invention can reduce the design difficulty of the top cover of the pressure vessel of the supercritical water-cooled reactor, simplify the operation management program of the control rod assembly, and improve the economy, safety and engineering feasibility of the supercritical water-cooled reactor.

The invention discloses a supercritical water-cooled reactor based on a stacked fuel assembly, which includes a fuel assembly channel and a control rod assembly channel, both of which are in the shape of a regular hexagon or a square; the outer side of each control rod assembly channel Fuel assembly passages are arranged continuously along the circumference to form a unit assembly, and several unit assemblies are arranged in a staggered array to form a honeycomb core structure; fuel assemblies with different enrichment standards are arranged in the fuel assembly passages, and along the fuel assembly passages The enrichment of the fuel assembly gradually increases from bottom to top in the axial direction; the control rod assembly channel is used to install the control rod bundle. The present invention effectively solves the problems faced by supercritical water-cooled reactors, such as excessive changes in axial temperature and coolant density, and unbalanced distribution of neutron moderating capacity in the core, without introducing moderating water rods and multi-flow flow schemes. It significantly simplifies the fuel assembly and core layout scheme, and improves the engineering feasibility.

The invention provides a digital television single frequency network radio frequency adapter and a broadband network system thereof. The adapter comprises a programmable module, and a broadband radio-frequency signal FM is subjected to down-conversion filtering to acquire a broadband intermediate frequency signal IF1. IF1 is switched in an intermediate frequency gain control module to acquire a broadband intermediate frequency signal IF2 with constant signal power. A / D conversion is performed to acquire a digital signal DATA1, which is switched in the programmable module to form DATA2=DATA1+delta t according to set time delay. The IF2 is subjected to D / A conversion to become a broadband intermediate frequency signal IF3 having accordant frequency domain with the IF2 and delayed time domain, and then the IF3 is subjected to up-conversion filtering to acquire a delayed broadband radio-frequency signal. The broadband network system is provided with the single frequency network radio frequency adapter. A multipath audio / video program source is processed by a front-end information source processing module, a channel processing module and a small signal broadband synthesizer into a small signal broadband radio-frequency signal FM. A signal chain transmits to each node, the single frequency network radio frequency adapter of each node adjusts the signal time delay and each broadband transmitter amplifies and transmits the signal FM, so the stability and covering effect of the system are improved and the cost is lowered.

The invention relates to a replaceable burner brick for a regenerative radiant tube burner, which comprises a burner cavity and a burner brick. The burner cavity has at least one card slot. The burner brick has at least one hook. The burner cavity and the burner bricks are connected through the slot and the hook. The burner provided by the invention adopts the slot type installation form instead of bolt connection, which saves radial space, does not affect the installation of the radiant tube burner, and avoids the defect that the bolt cannot be replaced due to deformation at high temperature.

The invention relates to an infrared digital image processing method, in particular to an image block-based adaptive infrared image and video vertical stripe removal method. The purpose of the present invention is to solve the technical problems that the existing infrared vertical stripe removal method has a large amount of calculation, is not conducive to hardware implementation, or has residual vertical stripes and side effects of image edges. By obtaining the preprocessed image frame data, filter the image data, block the image before and after filtering, and use the one-dimensional noise feature distribution of each image block in the column direction to perform adaptive image edge evaluation to obtain vertical lines The amount of superimposed noise, and correct the median value in units of columns as the final amount of superimposed vertical noise of the column, and then use the final amount of superimposed vertical noise to eliminate vertical lines on the original image in units of columns. This method can suppress the marginal side effects brought by the traditional algorithm, the algorithm complexity is low, and it has high real-time performance and engineering realization.

The invention discloses a driven energy absorbing pulling / pressing both-way buffer capable of being repeatedly used, and belongs to the technical field of spaceflight equipment. The device is mainly composed of four parts including an outer barrel assembly, a middle barrel assembly, an inner barrel assembly and a pull barrel assembly, wherein the middle barrel assembly is coaxially arranged in theouter barrel assembly, the inner barrel assembly is coaxially arranged in the middle barrel assembly, and the pull barrel assembly is coaxially arranged on the periphery of the connecting position ofthe outer barrel assembly and the middle barrel assembly. According to the device, through an innovatively-designed aluminum honeycomb resetting mechanism, a mechanical spring resetting device and aratchet one-way locking device are combined with the pulling / pressing both-way buffer based on aluminum honeycomb crushing energy absorbing materials, and the advantages that a traditional driven energy absorbing both-way buffer is simple in structure, small in mass and high in reliability are sufficiently inherited; and the traditional pulling / pressing both-way buffer can be repeatedly used and can be used for repeatedly-used soft landing devices needed for multi-target deep space exploration tasks in future.