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 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 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 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 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 relates to the technical field of monitoring equipment, and discloses a tilt monitor which comprises a base. The base is a disc-shaped block; vertical instrument is fixedly mounted on the upper wall surface of the base; the vertical instrument is of an existing structure and repeated description is not made; a circular cylinder is fixedly mounted on the upper wall surface of the base; the interior of the circular cylinder is of a hollow structure. The hollow part in the circular cylinder penetrates through the upper wall surface of the circular cylinder. The tilt monitor adopts the most original physical principle and works by virtue of earth gravity and can eliminate any external interference and is simple in working principle without complex circuits and electronic elementsand is not liable to make mistakes and is intuitive in principle and easy to install and can be easily installed by a common worker.

The invention discloses separating multi-cycle refrigerator control technology comprehensive training equipment which comprises a table box and a teaching circuit board. A refrigerator refrigerating system schematic diagram is printed on the surface of a panel of the table box, and indicating lamps are arranged. Layout deign of the teaching circuit board is laid out according to a plurality of function circuits of a refrigerator control system in a partition mode, identifying is carried out, and a plurality of potentiometers are arranged on the teaching circuit board for replacing refrigerator temperature sensors. The table box is electrically connected with the teaching circuit board, extension socket terminals electrically connected with the teaching circuit board are arranged on the panel of the table box, and the indicating lamps on the panel are connected to corresponding load circuit drive ports in the teaching circuit board respectively in parallel through the extension socket terminals. A plurality of barrier setting switches are arranged on the teaching circuit board, and are connected to components needing barriers to be set or barrier setting circuits in series or in parallel. A refrigerator display screen and an input key module are arranged on the teaching circuit board. The equipment is low in cost and facilitates teaching.

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 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.