63results about How to "The principle is intuitive" patented technology

The invention relates to application of microwave remote sensing in the field of forests and discloses a polarimetric synthetic aperture radar interferometry (POLInSAR) vegetation height inversion method based on complex field adjustment theory. The complex field adjustment theory and a physical model for POLInSAR vegetation height inversion are organically combined by the method. The method comprises the following steps of: I, performing registration on obtained complete polarization data of N scenes to obtain M baseline interference pairs; II, performing polarized interference on the M baseline interference pair to obtain M*P interference fringe patterns, and estimating corresponding complex coherences of the M*P interference fringe patterns; and III, working out a vegetation height hv based on complex field adjustment computation. The POLInSAR vegetation height inversion method based on the complex field adjustment theory is visual in principle, is easy to realize programming and extension, is a steady and feasible vegetation height inversion method, and can be widely applied to the POLInSAR technology to measure the vegetation height within a large-scale area and even a global scale.

The invention provides a pavement deflection full-field laser detection method and system. The method comprises the following steps: emitting a sector laser beam to a pavement to be measured, and forming a laser marking line which passes through a loading point of the pavement to be measured; providing an image acquisition control signal for a charge coupled device (CCD) image acquisition device, and controlling the image acquisition device to acquire a laser marking line image, wherein the operation comprises two-time image acquisition; acquiring two laser marking line images under two conditions that a standard load is loaded on the loading point and the standard load is unloaded from the loading point; transmitting the laser marking line image acquired by the CCD image acquisition device to a computer image information processing system in a wired or wireless mode; and performing image information differential interference processing through the computer image information processing system, thus acquiring image data of a deflection basin. According to the detection system and method provided by the invention, the pavement deflection is detected in a non-contact full-field mode, the distance between a supporting point and a measuring point is large enough, and a measuring basis is reasonably selected.

The invention discloses a two-level dual-mode space vector over-modulation method and a two-level dual-mode space vector over-modulation system. The over-modulation method comprises the following steps of: calculating a modulation ratio of a reference vector and an acting time of a basic vector according to a method of a linear modulation zone; determining an over-modulation zone in which the reference vector stays according to the modulation ratio to select different over-modulation modes; calculating a compensation coefficient of an over-modulation mode A if the reference vector stays at the over-modulation mode A, and correcting the acting time of the basic vector according to the acting time and the compensation coefficient of a zero vector; and calculating a compensation coefficient of an over-modulation mode B if the reference vector stays at the over-modulation mode B, and correcting an acting time of the basic vector according to the acting time and the compensation coefficient of two valid vectors. Due to the adoption of the over-modulation method and the over-modulation system, technical problems that the existing over-modulation method and over-modulation system are complicated, and difference between the output voltage and the reference voltage is large can be solved, the method and the system are simple in principle and simple to realize, and the heights of the output voltage and the reference voltage are maintained to be consistent.

The invention discloses an InSAR residual motion error estimation method and device considering topographic relief, and the method comprises the steps: obtaining a multi-scene SAR image, carrying outpreprocessing, and calculating a topographic phase comprising an InSAR residual motion error; calculating a simulated terrain phase by using the external DEM data; solving the difference between the terrain phase containing the InSAR residual motion error and the simulated terrain phase, carrying out the phase unwrapping of the difference, and taking the unwrapped differential interferometric phase as an observation value; constructing a differential interferometric phase parameterization model related to InSAR interferometric geometric parameters, DEM errors and baseline error components; foreach distance row pixel of each slave image, matching the observation value of the differential interferometric phase with a differential interferometric phase parameterization model to construct anequation to obtain an observation equation; and solving DEM errors and baseline error components in the multi-baseline observation equation set. The invention can accurately estimate the residual motion error.

The invention discloses a variable-step-size obscuration forecasting method. The variable-step-size obscuration forecasting method comprises the steps of: firstly, defining a satellite-target source coordinate system and establishing a conversion matrix corresponding to a WGS-84 coordinate system; then establishing a criterion of obscuration events of a satellite in the satellite-target source coordinate system; if the criterion is satisfied, further judging whether a vector of a connecting line between the satellite and a target source is within an observable range of a satellite obscuration antenna; if so, considering that an obscuration event occurs, and further performing effective forecasting on the obscuration event. The obscuration generation process is converted into a geometrical problem that a fixed-point rotating ray cuts the circumference within the satellite-target source plane by adopting a coordination conversion idea, so that the physic principle of the generation of the obscuration event is revealed substantially; the variable-step-size obscuration forecasting method is a variable-step-size obscuration forecasting algorithm which can efficiently improve the calculation efficiency; through the combination with the installation of the satellite obscuration antenna, the variable-step-size obscuration forecasting method is suitable for the practical project application and is particularly suitable for forecasting the sun or the GPS obscuration event for a long time.

The invention discloses a digital display torsion testing machine for teaching. A 220V single variable speed motor is combined with a worm gear speed reducer for realizing electric loading. A moment arm is combined with a pressure transducer for measuring torque. A rotary coder measures a torsion angle. The testing machine is equipped with a torsion testing machine digital display acquisition instrument, an electronic computer and torsion experiment specialized software. An instant value and a maximal value of the torque are displayed on the front panel of the torsion testing machine digital display acquisition instrument through large numbers. The torsion testing machine transmits the acquired signal to the electronic computer. The torsion experiment specialized software is operated on the electronic computer. A torque-torsion angle curve map and a shear stress-shear strain curve map of the point on the circumference of a torsion sample cross section can be drawn and dynamically displayed, thereby recording a yield torque and a maximal torque, calculating and recording a yield point shear stress and a maximal shear stress, storing all experiment results and realizing printing at any time. Furthermore only a 500W 220V single-phase power supply is required in power consumption.

The invention discloses a POLSAR image marine target detection method based on polarization direction angle compensation. According to the method, the polarization scattering property of an artificial metal marine target is used for detection, and in order to solve the problem that sea clutter reflection symmetry is affected by direction angle deviation generated by sea wave disturbance, direction angle compensation is conducted on a POLSAR image, and the detection accuracy of the marine target is improved. The method includes the steps that firstly, a completely-polarized image is acquired and related preprocessing operation is conducted; then, the polarized direction angle is calculated through a coherence matrix and direction angle compensation is conducted on the coherence matrix; finally, the intensity value of an element T'13 in the coherence matrix obtained after direction angle compensation is extracted and the artificial metal marine target is detected. The method overcomes the defects that a common marine target detection algorithm is complex in theory, difficult to achieve, poor in robustness and the like, and meanwhile starting from the polarization scattering property of the target, the marine target is accurately separated from sea clutters and target side lobes. The detection method is visual in principle, simple in algorithm and capable of facilitating programming realization and expansion.

The invention discloses a teaching training table for an alternating-current variable-frequency multi-unit air conditioning unit. The teaching training table consists of an alternating-current variable-frequency multi-unit air conditioning unit and a manipulation training table; the alternating-current variable-frequency multi-unit air conditioning unit comprises a refrigerating system, an electrical control system and an air heat exchange system; the refrigerating system consists of a variable-frequency compressor, a fixed-frequency compressor, a main four-way valve, an auxiliary four-way valve, a condenser, a throttling component and a multi-unit indoor unit; and the electrical control system comprises a sensor, a master control board, a variable-frequency controller and a plurality of electric apparatus executing mechanisms. The teaching training table is characterized in that: a structural drawing for pipelines of the refrigerating system is printed on the front face of the manipulation training table; and a thermo-dynamical parameter instrument and an electric quantity parameter instrument for displaying real-time parameters are arranged on the front face of the manipulation training table. In the teaching training table, design functions of comprehensive teaching training such as learnings of a running mechanism, signal measurement, fault setting and diagnosis, signal acquisition and real-time demonstration, performance tracking research and the like, and experiments and the like are realized through a simulation run mode and an actual run mode.

The invention discloses a measuring device used for measuring friction coefficients of disk-type friction sheets, and a measuring method thereof. The measuring device comprises a measuring tooling and a control system; a torque sensor and an angular velocity sensor are adopted by the measuring tooling, and are connected via a telescopic force arm lever, a guide rod, cone gear wheels, and a standard block; the standard block is dragged by a dragging motor to rotate on a test piece; the dragging motor is driven by the control system to rotate, and signals of the angular velocity sensor and the torque sensor are collected; in measuring, the value of torque is adjusted continuously by the dragging motor based on feedback of the angular velocity sensor until angular velocity is stable, and the friction coefficients of a friction sheet is calculated based on the value of torque and the mass of the standard block. The measuring device is suitable for friction coefficient measuring of friction plates which are applied to engineering vans of different types and possesses different semi-diameters.

The invention relates to a flip type drain valve. The flip type drain valve comprises a water-stop floating barrel, an outer cover, a drain component and a ventilating check valve. The water-stop floating barrel is movably connected to the outer cover. The drain component penetrates the water-stop floating barrel to be movably connected to the outer cover. A cavity is formed by the water-stop floating barrel, the outer cover and the ventilating check valve in a surrounding manner. Negative pressure in the cavity is controlled through control of opening and closing of the ventilating check valve, and descending and ascending of the water-stop floating barrel is further controlled to achieve water drainage of the drain valve. A drain valve control method includes that the cavity is formed by the water-stop floating barrel, the outer cover and the ventilating check valve in a surrounding manner, the negative pressure is formed in the cavity after water in the cavity is drained, and the water-stop floating barrel is controlled to ascend to open the drain valve; the ventilating check valve is opened to release the negative pressure in the cavity, and the water-stop floating barrel descends under the acting force of dead weight to close the drain valve. The drain valve can drain water by flipping, and control of water drainage volume is reliable and simple.

The invention relates to a method for simulating dynamic characteristics of a controlled object and a measuring and transducing process, which is used for obtaining a concentration parameter mathematical model by using a centralized processing method of distributed parameters for a production controlled technical process or a teaching experiment. The invention comprises the following methods of: a simulating method for establishing dynamic characteristics of a fluid technical process in a large chemical industry and a dynamic fluid transparent water tank which refers to a black box; a method for simulating purely retarding characteristics of a technical process; a method for simulating nonlinear characteristics of the technical process; a method for simulating unstable characteristics of an open loop of the technical process; a method for simulating multivariable coupling dynamic characteristics of the technical process; a method for simulating dynamic characteristics of a random process; and a method for simulating signal transmission process delay of a parameter measuring and transducing unit of the technical process. The technology of the invention can be used for physically simulating the technical process and the dynamic characteristics of production equirement, devices, machines, and the like of the liquid technology of the large chemical industry and can form an experiment which has various flexible and convenient object characteristics and can realize various object characteristics and control schemes with a single variable and multi-variables.

The invention discloses a receiving performance optimization method and device for an optical communication system, wherein the method comprises the steps of: demodulating and analyzing the signals received by a receiver to obtain information of an error code; regulating the working point of the receiver based on the information of the error; and carrying out feedback control to the receiver. In the method disclosed by the invention, the receiver is controlled by the information relevant to the error code; the information of error code primarily used for correcting and alarming is jointed to the control to the receiver of the optical communication system, so that the transmission performance of the optical communication system can be greatly improved.

The invention provides a method for extracting the 3D scattering center based on generalized Hough transform. The method comprises that first radar scattering sectional area data is processed to establish 2D scattering center height slices; binary analysis and generalized Hough transform are carried out on each 2D scattering center height to obtain the 2D position and sliding radius of the scattering center; a first linear equation which the scattering center height value z and sliding radius R satisfy is obtained by utilizing the 2D position and sliding radius of the scattering center; the first radar scattering sectional area data is replaced by second radar scattering sectional area data, and above steps are repeated to obtain a second linear equation; and the 3D position and sliding radius of the scattering center are obtained by utilizing the first and second equations. Thus, sliding 2D and 3D scattering centers can be extracted, the principle is simple and visual, and the method is convenient to realize.

The invention discloses a laser sound conducting method and device, belonging to the technical field of photoelectricity. The invention, based on intra-cavity laser enhancement technique and an optical tunnelling effect, provides a laser sound conducting method and device, wherein the device mainly comprises a high reflectivity mirror, a total reflection prism, a optical gain medium and a pumping source, a flexible deformation body, an photoelectric detector and a signal processing circuit. The method and the device have the advantages of high sensitivity, stable performance and strong environmental adaptability, are expected to be widely applied to the field of traditional sound conducting devices and other fields needing high-sensitivity sound wave measurement.

The invention provides a three-phase load flow distribution determining method on a single-phase load and inter-phase load mixed situation. The method includes the steps of obtaining low-voltage side load magnitude and load access modes of a network topology and nodes, then carrying out equivalent conversion on the low-voltage side load according to the different access modes, obtaining the output power of each phase of a medium-voltage side, and finally obtaining three-phase load flow distribution by means of a three-phase load flow distribution calculation method based on neutral point voltage excursion. The method solves the load flow calculation problem on the situation that the load access modes in a power distribution network are inconsistent through equivalent conversion, is suitable for obtaining three-phase load flow distribution of the power distribution network on the single-phase load and inter-phase load mixed situation, and enables analysis results of operation of the power distribution network to be more accurate.

The invention discloses an airborne multispectral LiDAR data land coverage classification method based on a super voxel, and the method comprises the steps: firstly carrying out the abnormal data elimination and multiband LiDAR point cloud fusion of multispectral LiDAR data, and obtaining the spatial position of a fused multispectral LiDAR point cloud and the single point cloud data of multiband spectral information corresponding to the fused multispectral LiDAR point cloud; then, on the basis of the principle of minimum information loss, carrying out voxelization on the data, and assigning values to the voxels; then, by utilizing a simple linear iterative clustering algorithm SLIC, merging voxels which are close in space and spectrum into super voxels, and performing feature extraction and standardization processing on the super voxels; and finally, adopting a support vector machine (SVM) classifier training data set to construct a one-to-many super-voxel-oriented SVM classification model, and completing the classification of ground features. The method has the advantages of being visual in principle and easy to implement, the better and more efficient classification effect is achieved, and a good foundation is laid for application such as urban basic geographic space information obtaining and updating.

The invention discloses a teaching instrument for an alternating-current variable-frequency multi-unit air conditioner integrated control system. The teaching instrument comprises an air conditioner host, an electrical control system and a teaching instrument board, wherein the electrical control system comprises an electrical control component, a sensor, an outdoor unit integrated circuit board,an indoor unit integrated circuit board and an executing mechanism which is driven by the outdoor unit integrated circuit board and the indoor unit integrated circuit board; the electrical control system also comprises a lightning protection module and a frequency conversion module; the teaching instrument board comprises a circuit principle board and an electrical control mechanism board; a schematic circuit diagram of the air conditioner host is printed on the circuit principle board; an electrical control system wiring diagram is printed and the electrical control component, the lightning protection module, the frequency conversion module, the outdoor unit integrated circuit board and the indoor integrated circuit board are arranged on the front surface of the electrical control mechanism board; and a wire is connected on the back face of the electrical control mechanism board according to the electrical control system wiring diagram, so that the outdoor unit integrated circuit board and the indoor integrated circuit board on the electrical control mechanism board are electrically connected with the executing mechanism. An experimental method provided by the invention has an intuitive principle and rich content, and is particularly suitable for experimental teaching of the alternating-current variable-frequency multi-unit air conditioner integrated control system for professional students of refrigeration, electricity, household appliances and the like.

The invention provides an airborne multispectral LiDAR data segmentation method based on a multivariate Gaussian mixture model, and relates to the technical field of remote sensing data processing. The method comprises the following steps: reading original airborne multispectral LiDAR multiband independent point cloud data to form an original airborne multispectral LiDAR multiband independent point cloud data set; performing abnormal data removal and data fusion on the original airborne multispectral LiDAR independent point cloud data set to form a single point cloud data set with multiband spectral information; extracting multispectral intensity features and elevation features reflecting ground object type differences from the single-point cloud data set with multiband spectral information; and finally, inputting the classification features of the airborne multispectral LiDAR data into the multivariate Gaussian mixture model to realize ground object clustering, obtaining a responsivity value of each data point, determining a category label to which each data point belongs according to a maximum responsivity principle, and finally obtaining a point cloud segmentation result.

The invention discloses a manual stress control type triaxial compressor. The manual stress control type triaxial compressor comprises a simple triaxial compressor part (2) and three manual water column pressure control parts (see (1) for a single structure) used for controlling an axial pressure, an ambient pressure and a reverse pressure respectively. According to the manual stress control type triaxial compressor disclosed by the invention, loading for the axial pressure, the ambient pressure and the reverse pressure of the triaxial compressor is realized by virtue of the three manual water column pressure control systems (1) respectively, and the simplified triaxial compressor part (2) is combined, so that the triaxial compressor has the advantages of being intuitive in principle, simple and convenient to operate, stable in performance, easy to maintain, low in cost, and the like. The large triaxial compressor produced by the structure disclosed by the invention is especially suitable for survey and design units in disaster prevention and control engineering to carry out large triaxial compression tests on soft soil, saturated soil, slip soil and the like.

The invention discloses a GMM non-uniform quantization system for filter multi-carrier modulation optical communication. The GMM non-uniform quantization system comprises a preprocessing module, a calculation module and an output module, wherein the preprocessing module is used for carrying out data preprocessing on a data sequence sent by a filter bank multi-carrier modulation transmitter to obtain a sample vector, and taking the sample vector as an input vector of the GMM quantization module; wherein the sample vectors comprise a real part signal sample vector and an imaginary part signal sample vector; the calculation module is used for calculating GMM parameters of an input real part signal sample vector according to an expectation maximization algorithm, estimating GMM parameters of an imaginary part signal sample vector according to the GMM parameters calculated by the real part signal sample vector, and respectively obtaining a Gaussian mixture model with the maximum responsivity; and the output module is used for inputting the sample into the Gaussian mixture model with the maximum responsivity to perform clustering operation, and obtaining and outputting a quantization result.

The invention discloses a polymer microcavity filling micro-structured optical fiber based quasi-distributed temperature sensing system and its signal demodulation method. The system includes a broadband light source, an optical isolator, an optical circulator, an optical fiber coupler, a single mode optical fiber, polymer microcavity filling microstructure optical fiber sensors, a spectrum analyzer and a computer, wherein the broadband light source is connected to the optical circulator through the optical isolator, an output port of the optical circulator is connected to one end of the optical fiber coupler, the optical fiber coupler has multiple output interfaces, the multiple output interfaces are connected to multiple polymer microcavity filling microstructure optical fiber sensors after passing through the single mode optical fiber, and the other output port of the optical circulator is connected to an input end of the spectrum analyzer to obtain temperature information of multiple monitoring sites. The polymer microcavity filling micro-structured optical fiber based quasi-distributed temperature sensing system has characteristics of multi-node distributed sensing, quick response, high sensitivity, simple and stable system, low cost and so on.

The invention discloses household air conditioner microcomputer control technology combined training equipment which comprises a table box and a teaching circuit board. A sketch map of an air conditioner refrigerating system is printed on the surface of a panel of the table box, and indicator lights are marked on key components of the refrigerating system. The layout of the teaching circuit board is sectioned in a layout mode according to function circuits and is circled and marked, two potentiometers are arranged on the board, and the potentiometers are connected with the input end of an indoor temperature sensor and the input end of an evaporator temperature sensor of a temperature control part circuit respectively. Extension socket terminals electrically connected with the teaching circuit board are arranged on the panel of the table box, the indicator lights of the key components of the panel are connected to corresponding load circuit drive ports on the teaching circuit board in parallel respectively through the extension socket terminals. A plurality of detection set points are arranged on a printed circuit of the teaching circuit board, and marks are arranged on the surface of the teaching circuit board. A plurality of barrier building switches are arranged and are connected to devices needing barriers to be built or barrier building circuits in series or in parallel. The equipment is low in cost and facilitates teaching.

The invention discloses a linear structure laser surface non-parametric model calibration device suitable for a rotary laser measurement positioning system and a calibration method thereof. The linear structure laser surface non-parametric model calibration device comprises a precise two-axis turntable and a marble platform, and a high-precision adjustable base and a laser emitting device are sequentially and fixedly arranged on the precision two-axis turntable from bottom to top; the laser emitting device comprises a constant-speed rotating platform and one or more linear structure lasers, and a photoelectric signal receiving device and a signal processing device are fixed on the marble platform; and the height of the high-precision adjustable base is adjusted, so that the original point of the laser emitting device basically coincides with the original point of the precise two-axis turntable. According to the invention, the standard data mapping table of the laser surface to be calibrated is obtained by establishing the direct mapping of the laser surface rotation time and the space standard angle, the difficulty that the laser surface profile is difficult to fit by adopting an accurate parameter model is overcome, and the method has important significance for the development of a multi-base-station space measurement positioning system.

The invention relates to a parallel debugging method for a compressor grating surface of an ultra-short pulse laser system, which belongs to the technical field of grating adjustment. The compressor grating is adjusted by using the space-spectrum interference information of the upper sub-aperture and the lower sub-aperture of the reference light and the output light of the compressor. The planes in the vertical direction are parallel, and the space-spectrum interference information of the left sub-aperture and the right sub-aperture of the output light of the compressor is used to adjust the plane parallelism of the compressor grating in the horizontal direction. The invention has an intuitive principle and simple operation. , High precision, can realize parallel fine adjustment of the compressor grating in the vertical direction and horizontal direction at the same time, without affecting the main laser light path, and can be realized online.

The invention relates to a multi-output boost rectifying circuit, in particular to a single-phase bipolar multi-output power supply, a three-phase unipolar or bipolar multi-output power supply and a multi-phase unipolar or bipolar multi-output power supply which are composed of diodes and capacitors, and belongs to electronic circuits or power circuits. The multi-output boost rectifying circuit is divided into four forms, namely a single-phase form, a two-phase form, a three-phase form and a multi-phase form; the single polarity is divided into positive polarity and negative polarity, and the double polarity is divided into symmetry and asymmetry; the series capacitor is also divided into two structural types of odd series and even series, and two forms of capacitor series connection and capacitor star connection are provided for connection. The bipolar multi-output boost rectification circuit is composed of two multi-output boost rectification circuits with different polarities. The three-phase or multi-phase boost rectification circuit is composed of a central capacitance column, a cross-linked diode column and a peripheral capacitance column, and the ripple pulsation of the power supply voltage is small. The multi-output boost rectification circuit has great practical value in occasions such as a G-type linear power amplification circuit and a multi-level inverter circuit.

The invention discloses a camera model standardization method and a standardization device. The camera model standardization method and the standardization device are achieved by virtue of a program control multi-tooth circular dividing table, a six-dimension rotary table and an one-dimension target. Direct mapping of space standard angle-image surface curve data is directly set up when the camera is calibrated. A two-dimension angle coordinate of a space standard straight line on the camera image surface is recorded, thus the camera standardization is completed. The purpose of measuring the single camera angle is achieved according to the calibrated straight line two-dimension coordinate on the random position of the standard data interpolation calculating image surface when the camera model is measured. According to the camera model standardization method and the standardization device, a traditional model that a parameter analysis imaging model is set up of the existing camera standardization method is surpassed. A non-parametric model composed by a large number of angle-curve data is set up. The camera model standardization method and the standardization device are visual in principle, convenient to achieve, good in feasibility, controllable in precision, low in cost and capable of effectively improving the current situation of difficult standardization of a large visual field camera. Complexity and cost investment of large-size target manufacturing are reduced. The camera model standardization method and the standardization device play an important role in the development of vision measurement of a large-scale workpiece.