101 results about "Field transformation" patented technology

The invention discloses a near-field antenna measurement method for any curved surface scanning. An antenna and a movable probe are driven to rotate through a rotary round table to perform scanning, and circular, linear and any curved surface motion ways can be adopted, so that the near-field test method can be suitable for any curved surface scanning; a scanning surface is not limited to a plane, a cylindrical surface or a spherical surface, and any curved surface can be adopted; various antennas can be measured. In the near-field antenna measuring method for any curved surface scanning, sampling points are taken as a plurality of points which are uniformly distributed in a parameter space, and then electric fields of any point are calculated through bilinear interpolation, so that a far electric field of the antenna can be calculated according to a Huygens equivalence principle, and near-field to far-field transformation is simple, convenient and easy to realize.

A Reed-Solomon encoding device is provided that can handle multiple RS (Reed-Solomon) codes using different field generation polynomials. The encoding device uses a first Galois field transformation that transforms source data into a specified Galois field on the basis of a first Galois field transformation parameter. The transformed source data is received by an encoder that performs encoding processing using a selected multiplication coefficient set. A second Galois field transformation is used for performing an inverse transform of the encoded data on the basis of a second Galois field transformation parameter. A parameter output is used for outputting the first Galois field transformation parameter, the second Galois field transformation parameter, and the selected multiplication coefficient set. The parameter output generator is operable to be loaded with transformation parameters and multiplication coefficients selected from a plurality of transformation parameters and multiplication coefficients.

The invention provides a method for correcting near-field test phases of a millimeter wave plane. The method comprises the steps that step 1, a set XY plane is scanned and four points in a zone with strong signals are selected to serve as phase sampling points; step 2, preset periods are set, plane scanning is conducted on the four points, and collection moments, collection data and collection positions of the four points in each period are determined; step 3, according to data variable quantity of the selected four points, the phase of each point in the scanned plane is corrected; step 4, Fourier transform is conducted on the corrected data of the whole scanned plane, far-field data are calculated through near-field data, and the near-field far-field transformation formula is . According to the technical scheme, a function relationship, corresponding to the sampling points, of phase drift and time is established through the method that the positions of the appointed sampling points on the scanned plane and the sampling data in the positions are recorded, phase compensation of the data of the whole scanned plane is achieved through the interpolation mode, and therefore the measurement accuracy of a near-field measurement system under a millimeter wave frequency band is improved.

The invention discloses an ecological fish farming method in a rice field, which comprises the following steps of rice field preparation, rice field transformation, fish farming facility preparation, rice seedling transplantation, biosorption, rice field disinfection, irrigation, fertilization, stocking fish seed selection, stocking fish fry disinfection, stocking and feeding management, wherein annular field fish ditches dug through the rice field transformation are V-shaped ditches arranged on the inner sides of ridges around the rice field; the biosorption utilizes a biosorption agent to adsorb heavy metal in rice field soil and irrigation water; and stocking fish seeds are selected from eight-beard catfishes. The invention further discloses rice produced by rice plants planted in the rice field using the ecological fish farming method. According to the method and the rice, an effective usable area of the rice field is increased significantly; pollution of the heavy metal such as lead and cadmium is reduced; integral benefits of fish farming in the rice field are improved; the ecological rice contains rich protein, more microelements such as iron, magnesium and calcium, and vitamin C, has no chemical pesticide residual, and is green and environment-friendly; and the content of the heavy metal such as lead and cadmium is very low.

The invention relates to a millimeter-wave\submillimeter-wave near-field amplitude and phase measuring method, and the base technical principle of the method is as follows: a same source-excited signal is distributed in a to-be-measured antenna and a reference antenna by a directional coupler and sent out, the spatial interference fields of the two in a scanning area are received by a scanning probe, and the amplitudes of the spatial interference fields are measured by a measuring system. Through carrying out virtual signal processing on the amplitudes of the spatial interference fields, the near-field amplitude and phase of the to-be-measured antenna are calculated and reconstructed, and if necessary, a far-field directional diagram can be obtained through far and near field transformation processing.

The invention discloses a novel method for fish culture in a rice field. The method includes the following steps of (1) field preparation, (2) field transformation, (3) rice cultivation, (4) fry stocking and (5) daily management. Through reasonable cultivation and control on stocking density and utilization of absorptive action of the rice field for substances such as nitrogen and phosphorus, pollution level of fish culture water is lowered; meanwhile, fertilizer is supplemented to the rice field to enable rice and fish to benefit from each other, coexist and grow; the method has the advantages of high resource utilization rate, saving in cost, pollution reduction, green and healthy culture and the like; compared with those of a traditional method for fish culture in a rice field, yield and quality of the rice and fish are effectively improved.

The present invention relates to a video encoding / decoding apparatus as well as a method for rotating and changing image block data. By means of the existing frequency field transformation method for remnant difference or original information, such as DCT / IDCT, the frequency field elements of the image block of sidelong borderline, goods as well as element after transformation are disperse, the concentration of low frequency point is not high, thus, the follow-up entropy encoding efficient will reduce. The present invention implements rotating processing to the sidelong borderline, object as well as element to make them be parallel / vertical to coordinates, or to make the sidelong borderline, object as well as element to be parallel / vertical to coordinates by means of implementing rotation to the coordinates; then to implement frequency transformation to the rotating image block, to make the frequency field elements fasten on the low frequency point, to improve the follow-up entropy encoding efficient.

The invention provides a near field-to-near field transformation method of a radar scattering cross section. The near field-to-near field transformation method comprises the steps of performing measurement to obtain first near field scattering data at a first distance of a radar target; preprocessing the first near field scattering data to obtain first near field preprocessed data; according to the first near field preprocessed data, obtaining second near field preprocessed data at a second distance of the radar target; and according to the second near field preprocessed data, obtaining second near field scattering data at the second distance of the radar target, wherein scattering data at any distance within the range of the near field of the target can be obtained through the measured near field scattering data at a certain distance, and accordingly, radar cross section (RCS) data at any distance within the range of the near field of the target can be obtained. By means of the near field-to-near field transformation method, testing cost is reduced, and changes of scattering properties of the target to be tested along with the distance can be conveniently researched.

The present invention provides an antenna directional pattern-based method for correcting the RCS of a calculation target. The imaging-based near-field and far-field transformation method is adopted as a basis, and the microwave imaging concept is introduced to establish the relationship among the two-dimensional image, the near-field echo and the scattering characteristics of a target. The accurate extrapolation of near-field data is realized without the need of imaging during the treatment process. Since the influence of an antenna directional pattern is considered during the echo scattering process of the near-field echo of a single station, the data representation of a target near-field is more accurate. An approximate antenna directional pattern function, instead of an actual antenna directional pattern function, is adopted. During the extrapolation process, the influence of the antenna directional pattern is corrected. Therefore, the construction complexity of the directional pattern function is simplified. Meanwhile, the calculation error of the target RCS is reduced.

The invention discloses an RCS near-far field transformation method based on a deep neural network, which comprises the steps of first, selecting a neural network according to radar echo data measuredin the near field, wherein a feed-forward neural network is selected if the radar echo data is single-frequency-point data, and a convolutional neural network is selected if the radar echo data is multi-frequency-point data; second, obtaining near-field RCS data and corresponding far-field RCS data to serve as training samples, wherein the near-field RCS data serves as input of the neural network, an output expected result is compared with the generated far-field RCS data, the neural network is trained through an error back-propagation algorithm, and a neural network conforming to error requirements is obtained through adjusting control parameters of the neural network; and third, inputting the RCS data measured in the near field into the trained neural network in actual transformation soas to obtain the transformed far-field RCS data. The RCS near-far field transformation method reduces numerical values caused by the discretization in implementation of the traditional algorithm, andis a brand new RCS near-far field transformation method.

The invention discloses an antenna radiation characteristic acquisition method based on phase-free near-field measurement. The method comprises the following steps: firstly, acquiring electric field amplitude information of all sampling points on a closed curved surface in a near-field region which is not far away from an antenna to be measured, and then establishing two nonlinear relationships between electric field distribution on a certain spherical surface of the near-field region and amplitude data on a measurement surface through a spherical wave expansion theory; and finally, speculating electric field distribution on the target spherical surface of the near-field region by using a genetic algorithm; when the algorithm stops iterative optimization, the tangential electric field distribution of the spherical surface to be guessed being basically close to an ideal result, at the moment, calculating a weighting coefficient on the spherical surface to be optimized by utilizing a spherical wave mode expansion theory, and obtaining a far field through spherical surface near-far field transformation. The invention provides a technology suitable for measuring antennas of various specifications.

The invention discloses a method for testing beam scanning characteristics of a passive array antenna, relates to the technical field of radar and antenna testing, and solves the problem of how to realize rapid and efficient testing of the beam scanning characteristics of an electrically large-size passive array antenna. The method is based on a planar near-field test system, a digital array radarbeam forming technology is applied to passive array antenna test, and a multi-channel switch and a vector network analyzer are used for replacing an active channel and a digital receiver of a digitalarray radar. A planar near-field scanning frame, a multi-channel switch and a vector network analyzer are used for cooperatively controlling a probe, sequential control and acquisition are matched, near-field amplitude and phase data of each antenna unit are obtained through one-time planar near-field scanning, and scanning beam near-field data are calculated through a digital beam synthesis method. Beam scanning characteristics of the passive array antenna are obtained through near-far field transformation; any beam scanning characteristic of the passive array antenna under different workingfrequencies can be obtained through one-time planar near-field scanning, and the test efficiency is improved by times.

A method for a vertical transition between a coaxial structure and a microstrip line features a slot in the ground plane of the microstrip line and near one end of its signal line. Multiple through holes are created at the substrate within the slot. The multiple through holes include a transition hole next to the end of the signal line, and at least a second hole. The transition hole and the slot are managed to establish a first eccentric configuration to achieve field transformation between the coaxial structure and the microstrip line, which would reduce the insertion loss of the vertical transition at higher frequencies and increase its 1-dB passband. The second hole and the slot are arranged to create a second eccentric configuration, and the second hole is used to relocate a resonance response caused by the slot towards higher frequencies to further increase the 1-dB passband.

The invention discloses a method for ecological breeding of rice field polyculture carp and relates to the technical field of agriculture. The method comprises a step (a) of field preparation; a step (b) of field transformation; a step (c) of rice planting; a step (d) of fry stocking; and a step (e) of feeding and management. By arrangement of a stocking area and a rice planting area which are separated, an organic fertilizer discharged in the stocking area by young ducks is effectively applied to the rice planting area through circulation of a water feeding pipe and a water discharging pipe. By application of the technical scheme, ammonia, nitrogen and phosphorus and the like which are decomposed in aquatic organisms and duck excrement and residue in complex planting and breeding can be neutralized, rice hypoxia and foot rot caused by water quality pollution are avoided, and the comprehensive production capacity of a rice field is improved.

The invention provides a high-yield rice planting method for controlling diseases, insect pests and weeds of rice fields. The high-yield rice planting method includes the following steps that 1, seed pretreatment, 2 rice field transformation, 3 soil turning and fertilization, 4 seedling raising, 5 seedling transplanting, 6 fry putting, 7 topdressing and 8 harvesting. According to the planting method, rice planting and rice field fish farming are organically combined, the utilization rate of rice fields is improved, good conditions are created for rice growth, the seed processing step is increased for seed sterilization and disinfection, bacterial breeding is effectively prevented, and the method is conducive to the healthy rice growth. In addition, seeds are soaked with sodium selenite to increase the selenium content in the rice seeds, a selenium-rich slow-release organic fertilizer is applied in the rice fields, organic and inorganic fertilizers are combined to protect rice field soil and improve the nutrient element content of the soil, and microbial strains and fungicides contained in the fertilizers combine to improve the disease preventing capability of the rice field and ensure the healthy growth of fish, the production costs are low, and the high-yield rice planting method is beneficial to market promotion and has good economic benefits.

Curvature of field transformation of OCT images during ophthalmic surgery may be performed with an OCT scanning controller that interfaces to an OCT scanner used with a surgical microscope. Real-time OCT images may be acquired by the OCT scanner, while an anamorphic transformation is applied to the OCT images to match the curvature of field for optical images viewed using the surgical microscope. The transformed OCT images may be displayed during surgery.

The invention discloses a multi-probe quasi-far-field electromagnetic scattering cross section (RCS) extrapolation test system. The system is composed of a quasi-far-field electromagnetic scattering measurement system and a quasi-far-field electromagnetic scattering measurement data processing system. The first part realizes one-dimensional rotation of a target to be tested by controlling a turntable, and acquires an original signal required for quasi-far-field electromagnetic scattering measurement of the target to be tested by using a special test radar multi-probe circuit. The second part realizes acquisition of electromagnetic scattering data, and calculates a far-field horizontal plane RCS of the target to be tested according to a quasi-far-field-far-field transformation extrapolationalgorithm. The test system provided by the invention overcomes the limitation of the traditional electromagnetic scattering test means on the test distance and the size of the measurable target, reduces the influence of physical sizes among multiple probes, and has the advantages of high test efficiency and low cost.

An image processing apparatus includes a first field-of-view converting unit configured to convert an image of a first camera, which is equipped in a vehicle and arranged to include a portion of a vehicle body in an image capturing range, into an image having an arbitrary field-of-view within a field-of-view of the first camera; a second field-of-view converting unit configured to convert a blind spot image, which is an image of a second camera capturing an image of a peripheral environment acting as a blind spot by the first camera, into the blind spot image having the same field-of-view as the field-of-view of the image obtained after the conversion by the first converting unit; and a compositing unit configured to compose a region corresponding to the blind spot image obtained by the second converting unit to the region of the vehicle body of the image obtained by the first converting unit.

The invention discloses a wave surface distortion-free free space remote laser transmission simulation device. In the device, optical Fourier far field transformation is realized by adopting a long focal length Fourier lens; light field remote transmission simulation is realized by adopting single-stage single-lens imaging and amplifying, optical fiber sampling, optical fiber attenuation and laser collimation; and simulation of vibration of a satellite platform is realized by adopting vibration of an output optical fiber head. By the device, conversion of a light beam from near field distribution to far field distribution can be simulated under a laboratory space scale, and the simulation of the vibration of the satellite platform is realized at the same time. The device is mainly used for communication between two satellite laser communication terminals as well as ground detection and verification of the tracking and pointing performance, has the advantages of simple structure, low cost and wide applicability range, and is easy to adjust.

An endoscope comprises a handle and a shaft with an optical housing at the distal end of the shaft enclosing a camera sensor positioned so that its optical axis is at an angle with respect to a rotational axis of the shaft. The camera sensor is rotatable with the shaft relative to a proximal housing of the handle. A rotation sensor in the handle detects the rotational angle of the camera sensor with respect to the proximal housing. A processor can correct the angular orientation of an image from the image sensor, converting of a rotating variable field of view to a translating variable field of view. A processor can apply variable smoothing of the rotation of the displayed image so that smoothing during rotational deceleration is greater than smoothing during rotational acceleration. The shaft may be enclosed in a trocar that allows for a space between the shaft and trocar that can be used to carry irrigation fluid to or from a space at the end of the shaft.

The invention relates to a multilayer plane wave decomposition-based one-dimensional single-station RCS (radar cross section) near-to-far field transformation method. The method includes the following steps that: multilayer planar waves for a target scattering near field are expanded according to the addition theorem, and the expanded multilayer planar waves are written into the integral of a transfer operator and a target reflectance pattern function on a unit angular spectrum sphere; and surface integral is simplified into circulation integral according to the flat body characteristics of a target, and the transfer operator is truncated according to precision required to be achieved by the algorithm, and matrix inversion is carried out through using a conjugate gradient method capable of rapid convergence. According to the method of the invention, near-field one-dimensional single-station scattering data are converted into far-field scattering data through a multilayer plane wave decomposition fast algorithm, and therefore, non-margin sampling can be realized. The method of the invention has the advantages of fast near-to-far field transformation, automatic antenna pattern compensation, automatic sampling position compensation and controllability in error, and can guide near-field sampling setting. The multilayer plane wave decomposition-based one-dimensional single-station RCS (radar cross section) near-to-far field transformation method is a fast and convenient method for obtaining a target RCS (radar cross section).

Provided is a transient electromagnetic detection method for determining a geo-electrical interface based on field transformation. The method comprises the following steps: a) finishing emission of a transient electromagnetic primary field signal and reception of an induction secondary field signal, and keeping the obtained transient electromagnetic field information data; b) converting data of each transient electromagnetic detection point into wave field data, and keeping the obtained wave field data; c) displaying a wave field curve of each detection point under the condition of a wave field; d) calculating depth of the wave field data corresponding to different time according to propagation velocity of an equivalent vortex ring of the transient electromagnetic field; e) with the depth being a horizontal axis and amplitude being a vertical axis, drawing a waveform image of each detection point in the depth direction and carrying out imaging; and f) according to the imaging result, determining the boundary of a vertical amplitude abnormity obvious area as the geo-electrical interface. The method can eliminate adverse influences of a volume effect on result interpretation, improves accuracy of determination of the geo-electrical interface and meets detection requirements.

The invention relates to a method for breeding escargots in a water-planted rice field. The method comprises the following breeding steps that A, rice field transformation is performed, wherein a ricefield foundation is heightened; B, disinfection and wild fish elimination are performed, wherein quick lime is made into slurry, then the slurry is uniformly splashed into the whole rice field; C, rice planting is performed, wherein bio-floating beds are installed in the rice field, then rice seedlings are transplanted into the bio-floating beds, and then a bio-organic fertilizer is uniformly putinto the rice field; D, escargots are put, wherein the escargots are put in the rice field, and loach fry, bighead fry and chub fry are put in the rice field; E, field drying is performed, wherein the heights of the bio-floating beds are adjusted to make rice roots exposed out of the water surface; F, harvesting is performed, wherein the bio-floating beds are pulled close to the side of the fieldfoundation to harvest rice after rice maturity, and escargots with qualified weights are fished out. By adopting the method for breeding escargots in the water-planted rice field, the rice field is obtained through direct transformation based on an existing rice field, a new way of escargot breeding is opened, growth space is reasonably utilized, the escargot breeding cost is reduced, and the economic value of the rice field is also increased.

The invention discloses a micro-flowing-water ecological breeding method for rare fishes in a rice field. The breeding method comprises the following steps of (1) selection of the rice field; (2) rice field transformation, wherein an enclosing ridge is built around the rice field, a water inlet and a water outlet are formed in the enclosing ridge of the two opposite corners of the rice field, then, fish ditches of cross-shaped structures are dug in the rice field, and finally, a feeding breeding ditch communicated with the fish ditches is dug in one side of the rice field; (3) rice planting, wherein manual transplanting of rice seedlings is conducted in rice planting areas in the rice field; (4) fry release, wherein 15 days after transplanting of the rice seedlings, fry are stocked in the feeding breeding ditch, and most of fry of sinocyclocheilus graham, schizothorax taliensis, neolissochilus benasi and spinibarbus sinensis bleeker are stocked; (5) feeding management, wherein after the planted rice seedlings turn green, artificial feed needs to be added into the feeding breeding ditch every day; (6) daily management. The allocation of mixedly-bred fry types is reasonable, planning for the rice field is proper, a scientific feeding mode is adopted, the growth speed of the fry is increased, and the yield of rice is also increased, so that the benefit of mixed fish breeding in the rice field is significantly increased.

Disclosed is a bidirectional long distance transmission simulation for two terminals in a laser satellite communication system and the ground testing device thereof. The device uses space dual channel structure to realize the independent positive and reverse direction bidirectional transmission of a laser beam, uses Fourier lens with long focal length to realize the optic Fourier far field transformation, uses a 4-f optic imaging amplifier with multi-level concatenated center sampling to simulate the long distance transmission of the optic field, and uses a scanning two-facet reflective mirror to realize the principle of reverse scanning with the same angle of the dual channels in the optic path to simulate the relative motion between satellites. The bidirectional long distance transmission simulation for two terminals in a laser satellite communication system of the invention can realize the laser beam transformation from the near field distribution to the far field distribution at the space scale of laboratory and can simulate the relative far field motion of two laser communication terminals being tested at the same time. The bidirectional long distance transmission simulation for two terminals in a laser satellite communication system and the ground testing device of the invention are mainly used in the bidirectional aiming, capture and tracking of two satellite laser communication terminals and in the ground testing and validating of the communication performance.

The present invention provides an antenna near field testing method and device. The method comprises a step of sampling an antenna through a probe and obtaining first near field distribution data of the antenna, a step of carrying out mathematical transformation according to the first near field distribution data, and obtaining a far field directional diagram of the antenna, and a step of carrying out mathematical reverse transformation on the far field directional diagram of the antenna and obtaining second near field distribution data of the antenna. Through a technical scheme provided by the invention, after the antenna is sampled to obtain the first near field distribution data of the antenna, the first near field distribution data is subjected to mathematical transformation to obtain the far field directional diagram of the antenna, and then the far field directional diagram is subjected to the mathematical reverse transformation to obtain the second near field distribution data of the antenna. Through one time of near and far field transformation and one time of far and near field transformation, a test error generated in a condition that a sampling distance in a near field test is an unequal distance is corrected, the accuracy of the near field test is improved, and the precision requirement of a servo system by the near field test is reduced.

Provided is a method for breeding crayfish in a rice field. The method comprises the following steps of (1) rice field preparation, (2) rice field transformation, (3) rice field disinfection, (4) seedling planting, (5) crayfish seedling stocking (6) fodder feeding, (7) rice field fertilization and (8) crayfish catching. The method for breeding the crayfish in the rice field makes the breeding of the crayfish more rational, environmentally friendly, and forms an ecological farming method with virtuous circle by combining with rice field culture.

The invention discloses a gravity and gravity gradient modulus combined three-dimensional inversion method. Firstly, the gravity gradient modulus is obtained through potential field conversion, the gravity gradient modulus and the gravity data are added into inversion together, compared with single gravity inversion, the inversion resolution can be improved, and compared with single gravity gradient modulus inversion, whether the density difference is positive or negative does not need to be judged for the second time. Meanwhile, a horizontal weighting function is constructed by utilizing thegravity gradient modulus, the model is constrained, and the horizontal resolution is further improved. In the process of solving the optimal solution, gravity data and prior geological information areused for establishing an optimized initial search model, the convergence speed is increased and the inversion accuracy is improved.

The invention relates to a rice and shrimp co-culture planting-breeding method. The rice and shrimp co-culture planting-breeding method comprises the following steps: 1) rice field transformation; 2)water body disinfection; 3) young shrimp stocking; 4) Bacillus subtilis pouring; 5) rice cultivation; 6) rice and shrimp management; and 7) rice and shrimp harvesting. According to the invention, through pouring of the Bacillus subtilis into a water body in an annular gully, the Bacillus subtilis has strong inhibition effect on harmful microorganisms like vibrios, colibacillus and baculovirus in aquatic products, so the occurrence of diseases and pests of shrimps can be effectively prevented; the Bacillus subtilis also can consume harmful substances like ammonia nitrogen and nitrogen nitrite in a water body, so the water body is purified, and the dissolved oxygen content of the water body is improved; and by utilization of a water-flooding method, pesticide-free prevention and treatment ofdiseases and pests of rice are realized, so no influence on growth and development of the shrimps is caused, and the yield and quality of the rice and the shrimps are improved. The method provided bythe invention realizes zero use of a chemical fertilizer and a pesticide; and an agricultural product produced by using the method provided by the invention is healthy, reliable, ecological and environmentally-friendly.

Embodiments of the invention provide a method and apparatus for measuring a far field pattern of an antenna, an electronic device, a storage medium, and a measurement system. A near field measurementprobe having a wideband dual polarized antenna is used. The wideband dual polarized antenna includes a first port and a second port. The method comprises the steps of acquiring near field data obtained by near field measurement of an antenna to be measured by using the near field measurement probe; acquiring a first differential operator and a second differential operator; determining an E[theta]component and an E[phi] component of the far field strength of the antenna to be measured respectively based on the first differential operator representing probe characteristics of the first port andthe second differential operator representing probe characteristics of the second port and the near-field data by using a preset near-far field transformation algorithm; and synthesizing the E[theta]component and the E[phi] component of the far field strength to obtain a far field pattern of the antenna to be measured. With the above scheme, it is possible to improve the test efficiency while certain test accuracy is satisfied.