66results about How to "Less measurement data" patented technology

The invention provides a wearable human abnormity monitoring and alarming system and a working method thereof; the wearable human abnormity monitoring and alarming system comprises a wearable device which is used for acquiring real-time activities and heart rate conditions of a wearer and for judging whether alarming is implemented or not, wherein the wearable device is provided with a three-axis acceleration sensor, a heart rate sensor, a clock module, a vibrator, a help button, a storage battery module, a first wireless signal receiving and transmitting module and a control module; the wearable device is also provided with an application gateway which is used for storing data acquired by the wearable device and for achieving information interaction with related mobile terminals, wherein the application gateway is provided with a second wireless signal receiving and transmitting module, a data storage module, a processing and control module and a mobile or wired communication module. The wearable device can be used for judging whether the problem of sudden consciousness loss with the symptom of abnormal heart rate occurs or not through heart rate when the wearer is continuously immovable, and can be used for transmitting alarming and help information to related mobile terminal users through the application gateway, so as to rescue timely.

The invention relates to the field of calibration of a gas flow meter, is particularly applied to the calibration of a gas flow meter of nuclear power engineering and aims at resolving the problem that in the prior art, when the gas flow meter is calibrated, a calibration method is complicated and the calibration period is long. A calibration device of a flow meter is provided and comprises a gas pump. The output end of the gas pump is connected with a filter pressure release valve, the output end of the filter pressure release valve is connected with the flow meter to be calibrated, and the output end of the flow meter to be calibrated is connected with at least two standard flow meters connected in parallel. A detection pressure meter is arranged between the filter pressure release valve and the flow meter to be calibrated. The calibration device of the gas flow meter is simple in structure, capable of calibrating the flow meter directly on a construction site, short in calibration period, simple in calibration method, small in measurement data and simple in calculation.

The invention discloses a realization method of an FDA MIMO radar system based on matrix completion, belongs to the field of radar technology, and aims at reducing measuring data which needs processing and obtaining higher distance, angle and Doppler-dimension resolutions. The method comprises the following steps that 1) according to practical requirements and characteristics of the FDA MIMO radar system, an emission carrier wave, an frequency array, the amount of emission antennas and the code-element length of the emission carrier wave are determined, and an emission model of a FDA MIMO radar is established; 2) according to a target space environment, the type of reception antennas and the amount of antennas of the FDA MIMO radar are determined, and a reception signal model is constructed; 3) based on obtained partial reception data, a Lq norm space processing technology to obtain recovery of a data matrix; and 4) the data matrix is combined with a parameter estimation method to obtain combined estimation of a target distance, an orientation 2D space and Doppler.

The invention relates to a dynamic contrast-enhanced magnetic resonance imaging method and a dynamic contrast-enhanced magnetic resonance imaging system. The dynamic contrast-enhanced magnetic resonance imaging method comprises the following steps of: scanning and obtaining K space data; conducting nonlinear image reconstruction on the K space data to obtain reconstructed images; conducting support detection on the reconstructed images or the sparsity coefficient of the reconstructed images; repetitively iterating image reconstruction and the support detection to convergence; and generating magnetic resonance images. By adopting the dynamic contrast-enhanced magnetic resonance imaging method and the dynamic contrast-enhanced magnetic resonance imaging system, since reconstructed images and supports are obtained by repetitively iterating the image reconstruction and the support detection to convergence and the supports are updated to image reconstruction conducted at the next iteration, the support information obtained through detection is more, the measuring data contained by signals used for reconstructing precise images is less, the scanning time is shortened and the goal of improving the image quality is achieved.

The invention discloses a shallow soil landslide early-warning method in the red-bed area and belongs to the technical field of landslide prevention and control engineering. The method comprises the steps of adopting a landslide mass and a non-landslide mass in the red-bed area as a respondent, measuring a gradients alpha of the landslide mass and the non-landslide mass, an area A of the landslide mass, an upper gradient beta, an upper area Au, a transverse left gradient theta 1, a transverse right gradient theta 2, a transverse left area AL, a transverse right area AR and a terrace area A' on the landslide mass; calculating a gradient factor S, an upper-side factor U, a two-side factor C, a terrain factor T, and a rainfall factor R; calculating a critical value Cr for inducing the shallow soil landslide in the red-bed area and conducting the condition judgment; determining the landslide level, and sending an early-warning signal. According to the technical scheme of the invention, the combined effects of two factors, namely the terrain factor and the rainfall factor, are fully considered to obtain the critical value Cr for inducing the shallow soil landslide mechanism. Therefore, not only the landslide early-warning is high in accuracy, but also the early-warning reaction time is greatly shortened. Therefore, the disaster prevention applicability is improved.

The invention discloses a three-dimensional homogeneous entity nondestructive measuring device and method. On the basis of the relation between force and moment balance and entity mass in a lever balancing system, figuring out the mass of each sheet of the measured entity C1 according to static balancing theory through measuring stress variations of different positions of the entity in the lever balancing system; establishing an equation set of the mass of each sheet and the contained micro unit body and an equation set of a gravity center coordinate; solving the equation set through intelligent calculation; obtaining the mass and spatial value of each unit body; and obtaining three-dimensional digital information of the measured entity C1 through graphic reconfiguration. The three-dimensional homogeneous entity nondestructive measuring device and method, disclosed by the invention, belongs to the mechanical non-contact measurement, an has the advantages of simple equipment, low cost,capability of realizing automatic measurement, high measuring speed, less measuring data and simplicity in reconfiguration and can be singly used for detecting defects of interior air holes of mechanical parts; and the measuring accuracy is higher than the measuring accuracy of the traditional domestic equipment.

The invention provides a method for estimating the geometrical information of a scene from a single image through a GAN (Generative Adversarial Network), and the method comprises the steps: inputtingan image of the scene and the depths of a plurality of pixels in the image into a trained GAN to obtain a depth image of the scene, wherein the depths of the pixels are the distances from the points,corresponding to the pixels in the image, in the scene to an observer, and the depth image is the sum of the depths of all pixels of one image. According to the invention, the method takes the image of the scene and the depths of a few of corresponding pixels in the image as the input, and employs a dual-consistency constraint GAN for predicting or estimating the depth image of the scene, so the method is simple and effective, and is low in cost.

The invention discloses a calibration method of an array antenna. The calibration method comprises the following steps of S1, obtaining a directional diagram in an array of array elements of the arrayantenna and the position of the center of the directional diagram in the array; S2, feeding T groups of linearly independent port excitations I1, I2... IT to obtain corresponding T groups of aperturefield excitations I'1, I'2... I'T; S3, calculating to obtain a calibration matrix C according to the T groups of linearly independent port excitations I1, I2... IT and the T groups of aperture fieldexcitations I'1, I'2... I'T, wherein I't=C*It exists for the corresponding port excitations It and aperture field excitations I't of any group; And S4, calibrating each array element of the array antenna according to the calibration matrix C. According to the invention, the array antenna can be quickly and efficiently calibrated through less measurement data in combination with known priori knowledge of the array antenna. Compared with the existing calibration method, the method provided by the invention has the advantages of less measurement data, high efficiency, simple system composition, easy engineering realization and low cost.

The invention discloses a calibration method of an array antenna. The calibration method comprises the following steps: S1, obtaining an array element directional diagram of the array antenna and theposition of the center of the array element directional diagram; S2, feeding T groups of linearly independent port excitations I1, I2... IT to obtain corresponding T groups of aperture field excitations I'1, I'2... I'T; S3, calculating to obtain a calibration matrix C according to the T groups of linearly independent port excitations I1, I2... IT and the T groups of aperture field excitations I'1,I'2... I'T, wherein I't=C*It exists for the corresponding port excitations It and aperture field excitations I't of any group; And S4, calibrating each array element of the array antenna according tothe calibration matrix C. According to the invention, the array antenna can be quickly and efficiently calibrated through less measurement data in combination with known priori knowledge of the arrayantenna. Compared with the existing calibration method, the method provided by the invention has the advantages of less measurement data, high efficiency, simple system composition, easy engineeringrealization and low cost.

The invention discloses an array antenna diagnostic method. The method comprises the following steps that S1, an array element directional diagram of an array antenna and the position of the center ofthe array element directional diagram are obtained; S2, port excitation I is fed; S3, positions of M first measurement points and first measurement data E of the array antenna at electric/magnetic fields of the M first measurement points are obtained; S4, aperture field excitation I' is obtained according to the array element directional diagram, the position of the center of the array element directional diagram, the positions of the first measurement points and the first measurement data E; S5, a difference value between the aperture field excitation I' and the reference aperture field excitation I'R is calculated, for a single array element, if the difference value is larger than a preset threshold value, the element is judged to be a fault element, otherwise, the element is judged tobe a normal element. Accordingly, by means of less measurement data, and by combining known priori knowledge of the array antenna, the array antenna can be diagnosed quickly and efficiently, the failure is positioned to the single array element, and the method has great significance on research and development and array antenna diagnosis on a production line.

The invention provides a method for calculating length of wire requiring tensioning for overlarge sagging arc distribution network wires. The method comprises following steps:(1) measuring the length s of a distribution network wire between two poles, the horizontal distance l between two poles, and height difference h between two hanging points; (2) deducing an arc equation for overlarge sagging arc wires; (3) obtaining stress for the overlarge sagging arc wires, and determining whether the wire can be tensioned according to a standard; (4) calculating corresponding target arc equation according to input target arc sagging value, and performing tension calculation on the equation after calculating, and judging according to the standard to determine whether wire tensioning is effective; (5) calculating the length of wire to be tensioned, and obtaining wire length of target arc wire according to the target arc equation. The method of the invention can realize automatic calculation by computer software. The invention can be applied to the wire tensioning construction of distribution network, and has the advantages of less measuring data, simple operation and convenient operation, and can provide great convenience for the distribution network maintenance personnel.

The invention belongs to the technical field of spectral measurement and in particular relates to a compressed sensing spectrum measuring device for electro-optical control transmittance coding. The device comprises a collimating lens, a polarizer, an electro-optical modulator, an analyzer, a converging lens and a photoelectric detector which are arranged in sequence. The photoelectric detector isconnected with an FPGA control and data acquisition module, the FPGA control and data acquisition module is connected with the electro-optical modulator through an LC resonance high-voltage drive circuit, and the FPGA control and data acquisition module is connected with a computer. A high-performance electro-optical modulator is designed and developed based on the basic theory of compressed sensing and spectral transmittance coding is implemented, so that the defect that the aperture coding compression spectrum measurement technology needs to adopt a dispersion light splitting element to realize coding conversion from a spectrum dimension to a space dimension is overcome, the complexity of an optical system and the cost of spectrum measurement are reduced; and high-speed spectrum measurement signal acquisition is realized by combining FPGA-based driving control with digital phase-locked amplification data processing technologies.

The invention discloses a method for compressed sensing of the features of a spectrum, and the method can achieve the compressed extraction of a feature signal of a spectrum signal based on a constructed spectrum compression measurement matrix, and achieves the compressed sensing of the spectrum features. In addition, the method also proposes a physical implementation method for a spectrum compression measurement matrix Phi based on a DMD (digital micro-mirror device). The method can effectively avoid the signal reconstruction and feature extraction, and the measurement data can be directly used for classification and recognition, thereby greatly reducing the calculating and storage expenditure, and improving the obtaining efficiency of the spectrum information. Because the dimensions of aspectrum feature signal are smaller than the dimensions of a spectrum signal, the measurement data obtained through the method will be smaller than the measurement data of a conventional compressed spectrum imaging method.

The invention discloses a prediction and assessment method for a two-lead transmission line terminal response in a non-analytic distribution source. The method comprises the steps of measuring physical parameters of leads; geometrically discretizing a transmission line; measuring geometric parameters of the transmission line; measuring electric parameters of the transmission line; and finally making a calculation to obtain an induced voltage and an induced current of a parallel or non-parallel two-lead transmission line terminal. In an assessment process, a specific analytic expression of an additional excitation source does not need to be known and only discretized data, distributed along the leads, of an excitation field needs to be known. According to the method, computing errors caused by reasons such as energy loss and the like in an irradiation process of the distribution source do not need to be considered, the transmission line is slightly transformed, the measurement data amount is relatively small, and the accuracy of a measurement result is relatively high; in a measurement process, other additional circuits do not need to be carried, so that the errors caused by additional devices are relatively small; and the method is suitable for various additional electromagnetic field irradiation and is simple in operation and easy to realize.

The invention provides an experimental device and an experimental method for ice accumulation and transportation in front of a gate under the condition of free outflow of water flow. The experimentaldevice comprises a water inlet circulating system and an experimental water tank system, the experiment water tank system comprises a cuboid experiment water tank with the specification of (14-16)m*(0.4-0.6)m*(0.7-1.0)m, and an experiment water tank water inlet pipe, a water inlet energy dissipation device, a water flow energy dissipation device, a simulated ice block putting device, a water flowsection monitoring device, a gate and an experiment water tank water outlet pipe are sequentially arranged in the length direction of the experiment water tank. The experimental device is specially designed for experiments of ice accumulation and transportation in front of a gate under the condition of free outflow of water flow, and has the advantages of reasonable structure, small occupied areaand lower device and experimental cost, the experimental method is matched with the experimental device, optimization is performed on the basis of the existing experimental method, and the time for asingle experiment is shortened.

The invention discloses a diagnosis method of an array antenna. the method comprises the following steps: S1, obtaining an in-array directional diagram of array elements of an array antenna and the position of the center of the in-array directional diagram; S2, feeding port excitation I; S3, obtaining the positions of the M first measurement points and the first measurement data E of the electric/magnetic field of the array antenna at the M first measurement points; s4, according to the directional diagram in the array; the center of the directional diagram in the array is positioned; s5, calculating a difference value between the aperture field excitation I'and the reference aperture field excitation I'R, for a single array element, if the difference value is greater than a preset threshold value, determining the array element as a fault array element, and otherwise, determining the array element as a normal array element. According to the array antenna fault diagnosis method, the array antenna can be rapidly and efficiently diagnosed through less measurement data in combination with known priori knowledge of the array antenna, and the fault is positioned to a single array element, so that the array antenna fault diagnosis method has important significance for array antenna diagnosis on research and development and production lines.

The invention provides a multi-dimensional cross calibration method in the test and measurement. The method comprises the following steps of determining a measured physical quantity and a real directly-measured parameter; determining all factors influencing the measured physical quantity; determining an intersection of all the factors and a measuring point of each factor containing the measured physical quantity; first measuring a direct parameter value at the intersection, and then measuring a direct parameter value of each measuring point of each factor and a value at the intersection of other factors in measurement; determining the relation between the measured physical quantity and the direct parameter as well as between the direct parameters; normalizing error values of all the factors on the intersection; calculating a value of the measured physical quantity, and completing the calibration and measurement. The method is not subjected to the limit of the dimensions, the relation between the direct parameter and each factor can be conveniently approximated through a polyline method, and the method is easily realized on the engineering; by adopting the normalization concept, only the points on the intersection are measured, so that the measurement data are greatly reduced; by adopting the polyline method, the measurement precision is high.

The invention, which belongs to the technical field of aeroengine assembling, discloses a mounting distance measuring device and measuring method of a bevel gear pair. A first core shaft for simulating the working state of a driving bevel gear, a second core shaft for simulating the working state of a driven bevel gear, a first mandril, and a second mandril are arranged at the mounting distance measuring device, wherein the first mandril and the second mandril are in contact and cooperation with each other by a spherical element; and the axis of the first mandril and the axis of the second mandril are intersected at the center of the spherical element. Therefore, the spatial position of the mounting space, that is, the spatial position of the axis intersection point of the bevel gears is transformed into a measurable dimension, so that problems that the mounting distance measuring is not carried out accurately, the actual working state can not be reflected, and the measurement period is long can be solved. The measuring device is suitable for measuring the mounting distance when the bevel gear axis is at an arbitrary angle; the working state of the bevel gear is restored effectively by using methods of compensation and limiting; a few of measuring data are needed; the operation method is simple; the mounting distance of the driving bevel gear and the mounting distance of the driven bevel gear can be measured accurately; and the adjusting pad is selected correctly and the tooth space is real.