47results about How to "Increase the number of sampling points" patented technology

The invention discloses an online measurement system and a method for plane shape errors. The system comprises a sensor array, a data collection and analog-to-digital conversion module and a data processing and displaying module, wherein a modified least square successive two-point method plane shape error separation algorithm is used in processing software of the data processing and displaying module, and a data combining and fitting technique is introduced. The method is based on the modified least square successive two-point method plane shape error separation algorithm. The whole sampling data of a plane to be measured are subjected to partitioned processing, dimensionality reduction processing of the data array is achieved through an online partitioning algorithm, then the data processing speed is improved, the capacity of sampling points is increased, and the method mainly comprises processes such as data error separation and fitting. The data combining and fitting technique is used, so that the distribution density of sampling points is improved effectively, and the capability that a measurement system reflects the plane shape error of the plane to be measured is improved.

The invention provides a method and apparatus for evaluating network coverage quality. The method comprises the following steps: dividing a map into a plurality of grids according to geographical characteristics; receiving and obtaining measurement report data and corresponding location information uploaded by mobile terminals within the current time period, and determining the grid to which eachpiece of measurement report data belongs according to the location information of the measurement report data; obtaining the measurement report data corresponding to each grid, and determining the network coverage quality of each grid within the current time period; receiving and obtaining the measurement report data and corresponding location information uploaded by the mobile terminals within the next time period to determine the network coverage quality of each grid within the next time period; and obtaining an evaluation result of the network coverage quality according to the network coverage quality of each grid within a plurality of time periods, wherein the obtained evaluation result is highly objective and has certain timeliness.

The invention discloses a magnetoelectric encoder with an end auxiliary stator coil. The auxiliary stator coil is cut by a magnetic field when multi-antipode magnetic steel rotates to generate voltage, the rotating speed of the current encoder is judged by reading a voltage peak value, and the rotating speed direction of the current encoder is obtained by an angle value signal differential value obtained by multi-antipode Hall calculation. The magnetoelectric encoder comprises an encoder structure, an auxiliary stator coil structure and a side shaft. The side shaft rotates, the multi-antipodemagnetic steel is driven to rotate to cut the auxiliary stator coil in a magnetic field, the voltage is generated, the higher the rotating speed of the rotor is, the higher the amplitude of the sine voltage obtained in the winding coil is, the voltage amplitude and the rotating speed are in a linear proportional relation, the rotating speed of the current encoder is judged by reading a voltage peak value, and the rotating speed direction of the current encoder is obtained through an angle value signal differential value obtained through multi-antipode Hall calculation.

The invention relates to a recursion demodulation method for an electrical tomography system, which is characterized by comprising the following steps: (1) establishing an initial equation and a recursion equation according to an excitation frequency f and a sampling frequency f s of a system; (2) taking a zero phase moment of an excitation signal as an initial moment, and calculating initial values of a data matrix B and a state matrix P based on an initial equation in step (1) according to two sampling point data of a measurement signal immediately after the initial moment; (3) substituting the initial values of the data matrix B and the state matrix P as well as newly added sampling point data into the recursion equation in step (1) so as to update B and P; and (4) judging whether a demodulation result meets the accuracy requirement of the system or not, if not, returning to step (3), and if so, finishing demodulation and outputting the amplitude and phase data of the measurement signal. The recursion demodulation method only needs at least two sampling point data, and can improve demodulation accuracy and anti-noise ability by adding sampling points.

The invention belongs to the technical field of optical fiber distributed sensing, and relates to a method for realizing high-frequency phase demodulation in a distributed optical fiber sensing system. The method mainly comprises the following steps of: S1, constructing a periodic non-uniform sampling time sequence; S2, generating a periodic non-uniform sampling pulse light sequence, and performing data acquisition on original data; S3, extracting effective data from the original data; S4, carrying out heterodyne phase demodulation on the length of the sensing optical fiber; S5, performing signal reconstruction on a heterodyne phase demodulation result by using an orthogonal matching pursuit algorithm; and S6, performing Fourier transform on the phase signal obtained by reconstruction to obtain the phase and frequency information of the vibration signal. According to the method, limitation of the Nyquist sampling theorem on the detection frequency band range of the distributed sensing system is broken through, the contradiction between long-distance sensing and high-frequency detection is solved under the condition that the hardware complexity does not need to be increased, recovery of the high-frequency phase signal is realized, and the recognition and classification of the vibration signal are facilitated.

The invention discloses a magnetic resonance non-Descartes sampling quick rebuilding method. The magnetic resonance non-Descartes sampling quick rebuilding method is provided through utilizing the characteristics of the symmetry of sampling tracks and a back compensation grid algorithm, and belongs to the technical field of magnetic resonance imaging. According to the magnetic resonance non-Descartes sampling quick rebuilding method, a back compensation gridding rebuilding algorithm is effective on samples without severe sampling track variation, and additionally, a density compensating function in the back compensating algorithm is only related to the sampling point distribution (i.e. sampling tracks) and is not related to sampling values. The characteristics are combined together, so that the computing speed of the provided new non-Descartes sampling quick rebuilding method is greatly increased than that of a conventional grid rebuilding algorithm, and the rebuilding image quality is not obviously changed.

The invention relates to a method for accelerating drawing of a direct illumination effect of a three-dimensional scene by means of area light source visible spatial correlation. According to the method, a characteristic of spatial correlation between area light source sampling point visibility of adjacent visible field scene points on the same geometrical object surface is utilized. In calculating a direct illumination approximate value of the visible scene point, the area light source sampling points and the visibility calculation result of the visible field scene point and the adjacent visible field scene points on the same geometrical object surface are utilized for finishing Monte Carlo direct illumination estimation, and the number of area light source sampling points for direct illumination contribution estimation of the visible field scene point is increased at a relatively low cost, thereby improving quality of a drawn image frame. The method increases an operation for testing whether the visible field scene points which correspond with the adjacent pixels are in the same geometrical object surface, thereby remarkably reducing direct illumination effect distortion caused by visibility multiplexing at a boundary between different geometrical objects in the image frame.

The invention discloses a drive test method and a system in a GSM (Global System for Mobile Communications) mobile network. The method comprises the steps that that at a drive test spot to be tested, a signal transmitted in a preset time window by a base station of a cell corresponding to the current frequency spot is received; then a drive test parameter of an FCCH (Frequency Correction Channel), a drive test parameter of an SCH (Synchronizing Channel) and a drive test parameter of a BCCH (Broadcast Control Channel) of the cell corresponding to the current frequency spot at the drive test spot to be tested are calculated; and the drive test parameters of the three physical channels are subjected to weighted summation operation so as to obtain a target drive test parameter. According to the drive test method and the system in the GSM mobile network, with the adoption of a mode of obtaining the drive test parameters corresponding to the three physical channels, the time and sampling spots for testing the drive test parameters are prolonged and increased, so that the target drive test parameter obtained according to the drive test parameters corresponding to the three physical channels is higher in accuracy.

The present invention discloses a battery electric vehicle drive motor rack automatic calibration method. The method comprises the steps of: connecting a motor, an upper computer, a dynamometer, a motor controller and a motor cooling system, correcting an address according to a communication protocol of the motor and the motor controller, confirming the model of the motor and correcting related technical parameters; performing automatic identification, learning angles of a rotor and a rotary transformer, determining how large the rotation speed is to cause that the motor enters a weak magneticregion, and at the same time, performing fine tuning of the angle to allow the torque of the motor to be not changed much prior to and after entering the weak magnetic region; and determining a basespeed threshold value n0 of the motor entering the weak magnetic region, learning a feedforward angle value, performing an automatic calibration process, and finally performing calibration and verification.

The invention provides a z-direction fly focus scanning mode and an image reconstruction method, and relates to the technical field of medical images, the z-direction fly focus scanning mode comprises Z-direction fly focus sampling, adjustment of positions of two adjacent focuses, rotation of a frame shaft by 180 degrees in an axial scanning mode, Z-direction fly focus control, and linear change slope design. The image reconstruction method comprises the following steps: respectively rearranging data of two focuses to form two parallel beams; carrying out interpolation in the angle direction, so that the scanning data angles of the two fly focuses are the same; performing interpolation in the radial direction, so that the non-equidistant parallel beams of the two focuses are converted into equidistant parallel beams; respectively carrying out filtering operation on the two parallel beams; back projection calculation. According to the Z-direction fly focus axis scanning mode and the image reconstruction method, reconstruction can be carried out at any position in the Z direction to obtain images with completely identical layer thicknesses; meanwhile, the number of Z-direction sampling points is increased through the special axis scanning mode and the reconstruction method, and therefore Z-direction aliasing artifacts are reduced.

The invention discloses a noise amplitude modulation jamming suppression method based on time domain cancellation, belongs to the technical field of radar anti-jamming, and especially relates to parameter estimation, fast Fourier transform and search traversal technologies. Logarithm transformation is carried out on a receiving signal; jamming amplitude information is extracted from a real part; a noise amplitude modulation jamming signal is divided by the amplitude, thereby forming a single frequency signal of which frequency is jamming carrier frequency and phase is jamming initial phase; and Fourier transform is carried out on the signal, thereby obtaining the jamming carrier frequency and the jamming initial phase. In order to increase estimation precision, zero padding is carried out on the Fourier transform. The processing effectiveness is showed by simulation. According to the algorithm, a practical sampling rate is unnecessarily increased, there is no special demand for the relationship between the jamming carrier frequency and signal carrier frequency, and the method has general applicability.

The invention discloses a three-dimensional data generation method of railway lines for an RTG automatic walking system, an RTG is controlled to walk along railway lines of a site to collect positioning information in real time; a horizontal position of the railway line and a height difference between the railway lines on both sides are generated by using the positioning information; and real-timedeformation monitoring is performed on the site. Compared with the prior art, the three-dimensional data generation method disclosed by the invention has the active effects that no additional calibration equipment is needed, the measurement efficiency is high, the measurement accuracy is better, and site deformation can be monitored in real time.

The invention discloses a phase sensitive protection method for a coal mine low-voltage power distribution protector, which comprises steps: multi-channel synchronous sampling is carried out on three-phase voltage and three-phase current of a coal mine power grid; sampling signal values of the three-phase voltage and the three-phase current are calculated through DFT algorithm, and a real part and an imaginary part of sampling data of each channel are obtained; the maximal current phase is selected, the real part of the phase current I is Ir, the imaginary part is Ii, the real part of the corresponding phase voltage U is Ur and the imaginary part is Ui; the phase current I is rotated at a preset angle phi in a clockwise mode, the real part and the imaginary part of the phase current I after rotation are calculated, wherein the preset angle phi is 48 DEG to 59 DEG; active power P1 of the phase current I after rotation is calculated, action judgment is carried out, and if the active power P1>0 and the maximal current amplitude value is greater than the current fixed value, the phase sensitive protection action is executed. Thus, calculation complexity is small, the calculation efficiency is high, and quickness and reliability of phase sensitive protection are improved; selectivity of a short circuit protection action is improved; and protection sensitivity is improved.

The invention relates to a mobile robot path planning method integrating membrane calculation and RRT. The method comprises the steps of introducing membrane calculation on the basis of an original RRT algorithm to optimize the original RRT algorithm, setting a membrane calculation structure, expanding a random tree independently in each basic membrane, and increasing the number of sampling pointsduring random tree expansion in each basic membrane; and setting an inter-membrane communication rule to update a corresponding relationship between sampling points output by each basic membrane andfather nodes of the basic membrane, and returning an updated result to the corresponding basic membrane to continue to expand the random tree; and continuously iteratively expanding the random tree inthe whole membrane system until the random tree in one basic membrane reaches an end point, and stopping expanding. According to the method, the number of sampling points is increased and the inter-membrane communication rule is set during random tree extension in each basic membrane, so that the random tree extension in the membrane has higher directivity, and the real-time performance and reasonability of the path planning of the mobile robot are further improved.

The invention belongs to the technical field of clean workshop differential pressure control, and particularly relates to an indoor micro differential pressure sensor sampling mounting head which comprises a sampling mounting head body, and the body comprises a conduction part and an acquisition part; the conduction part is in threaded connection with the collection part, the conduction part is arranged above a ceiling in a purification workshop room of the fan filter, the collection part is arranged below the ceiling in the purification workshop room of the fan filter, and the conduction partand the collection part are both made of stainless steel materials; compared with a plastic material body, the stainless steel material body has the advantages of being longer in service life and notprone to aging, dust generation and chipping falling, the sampling head adopts the porous collection design, it is guaranteed that a source taking point is stable, higher anti-interference capacity is achieved, and benefits of manufacturers are better facilitated from the aspects of cost and later-period maintenance.