59results about How to "Uniform precision" patented technology

The method makes multiple connections of data signal and pilot signal at the sending end of the communication system after mapping the coded modulation. Also the method makes the pilot signal appear at some frequency points only, and the data have no such frequency components. The circle prefix is added into each data block at the sending end, and the circle prefix is removed at the receiving endin order to eliminate interference between data blocks or between signals in frequency domain caused by time delay expand in multiple routes. Then, the channel parameter estimation at the corresponding frequency point is obtained by using the picked pilot signal in frequency domain. Base on the estimation at the said point, the channel parameter estimations for all frequency points are obtained by using the interpolation method. The invention has the advantages of simple algorithm and high accuracy for channel parameter estimation.

In order to precisely detect latent defects where a data-synchronizing signal is to be stored despite changes in the rotation of an information storage medium, a region data detection is used during a defect detection mode that is longer in the back-and-forth direction than a data-synchronizing signal used during a normal operation mode. The data detection region may be increased by the amount of change in the rotation. Thus, latent defects that may, due to a change in the rotation of the storage medium, come into agreement with the position of a data-synchronizing signal utilized during a normal mode of operation may be reliably detected, maintaining a high precision by taking a change in the rotation of the storage medium into consideration.

The invention relates to an integral orientation method of ground scanning point cloud through linear fitting. The method is characterized by comprising the following steps: (1) distributing a spherical orientation target in a measured regional network for multistation scanning to obtain scanning point cloud data; (2) connecting into lines from all scanning stations to the spherical orientation target observed on the scanning stations to form the regional network; (3) carrying out fitting on coordinates of the sphere center of the spherical orientation target in a scanner coordinate system; (4) collating run adjustment; (5) setting up a mathematical model of a single laser beam, deducing a linear fitting mathematical model of the laser beam with the same name, estimating the error in point measurement of point cloud orientation, and transforming point cloud coordinates into a coordinate system designated by engineering surveying, thereby achieving integral orientation of point cloud. According to the method, the parameter approximate value is not required to be calculated, solution parameters can be directly fitted, the formula is simple, and the more the scanning stations are, the higher the resolving precision is.

The invention relates to the technical field of battery management systems, in particular to an active equalization control method and system for the lithium ion battery. The lithium ion battery is provided with a plurality of single batteries which are connected in series, and the active equalization control method comprises the following steps: S1, estimating the initial value of the residual electric quantity of the lithium ion battery, and obtaining the estimated value of the residual electric quantity of the lithium ion battery and the voltage detection value of the lithium ion battery inreal time; S2, according to the estimated value of the residual electric quantity of the lithium ion battery and the voltage detection value of the lithium ion battery, respectively calculating the average value of the residual electric quantity of the lithium ion battery and the average value of the voltage of the lithium ion battery; S3, according to the average value of the residual electric quantity and the average value of the voltage, judging the single batteries needing to be equalized; and S4, equalizing the single batteries needing to be equalized. The method has the beneficial effects that the precision and reliability of the equalization system can be improved, the use efficiency of the battery is improved, the service life of the battery is prolonged, the control method is simple, the requirement on the controller is reduced, and the system reliability is improved.

The invention provides a low-intermodulation compatible type connection radio frequency socket and plug. The socket comprises an outer socket conductor, an inner jack conductor, a socket insulating support, an end face reed and a radial reed. The outer socket conductor is internally provided with an annular groove matched with and coupled to an outer plug conductor. The inner side of the annular groove is the front-segment tongue diameter, and the end face of the annular groove is a mechanical benchmark face. The front-segment tongue diameter and the mechanical benchmark face are designed to be of an integrated structure. The inner plug conductor in the plug is internally provided with an annular groove matched with and coupled to the outer socket conductor and an unlocking sleeve. The inner side of the annular groove is matched with the outer side of a socket-shaped groove in the radial direction, the satisfactory axial matching length is set, and the bottom of the annular groove is the mechanical benchmark face. According to the low-intermodulation compatible type connection radio frequency socket and plug, improvement is conducted on the mechanical benchmark face and electrical benchmark face separating design and contact outer conductor slotting design in the prior art, continuity of full-spectrum characteristic impedance and electric connectivity of a contact port are guaranteed, intermodulation interference and reflection coefficients are further lowered, and wider working bands and excellent return losses are achieved.

An object is to charge resin into cavities in accordance with molding conditions individually set for the cavities by controlling valve gates disposed within a mold apparatus or a mold support apparatus by use of a controller, to produce individual molded products under optimal molding conditions, to produce molded products having no variation in molding accuracy and quality, and to lower the cost of the mold apparatus. For such a purpose, an injection molding machine includes a plurality of cavities formed in a mold apparatus; resin passages for charging resin into the cavities; a plurality of selection means respectively disposed in the resin passages corresponding to the cavities and adapted to selectively open and close the corresponding resin passages; and a controller for controlling the selection means.

The invention discloses a binocular visual sense based intelligent obstacle avoidance algorithm. The algorithm comprises the following steps that S1) a route is planned according to a destination of arobot, left and right cameras of a binocular camera are calibrated, and plane equations of the ground in coordinates of the left and right cameras are calculated respectively; S2) the binocular camera collects an image in front of the robot, and the image is de-noised; and S3) distortion and polar lines in the two images collected by the left and right cameras of the binocular camera are corrected, distortion is eliminated, matching points are limited in one straight line, and finally, a parallax image is obtained by matching. The algorithm satisfies the requirement for detecting barriers correctly in high precision, the requirement of real-time detection can be met, the accuracy and instantaneity are both taken into consideration, and the robot achieves a good obstacle avoidance effect.

The invention provides a network social system and a network social method based on active broadcast pushing. The network social system comprises a selection module, an information pushing module andan information display module, wherein the selection module is used for selecting a reception user group according to user features by a transmission user; the information pushing module is used for receiving a selection result of the selection module, and pushing corresponding target information according to the reception user group selected by means of the selection module; and the information display module is used for receiving the target information pushed by means of the information pushing module, and displaying the target information to the reception user group. The network social system and the network social method provided by the invention select the reception user group according to the user features, actively push broadcasts, transmit the target information to an arbitrary user group, and solve the problem of social difficulty of one user socializing with many unfamiliar groups.

The invention relates to the field of copper electrode machining, in particular to a mirror surface chromium copper computer numerical control (CNC) machining process applied to hemispheroid or semi-ellipsoid machining. The mirror surface chromium copper CNC machining process comprises the steps: S1, a blank is clamped on a spindle of a CNC machine tool; and S2, the spindle is started to drive theblank to rotate, a cutter is selected to cut the blank, thus the blank forms a base and a machining part, the machining part is in a hemispheroid or semi-ellipsoid mirror surface profile, the machining part extends out of a main surface of the base, the axis of the machining part coincides with the axis of the spindle, and the cutter conducts one-time feed along the set route. The cutter conductsmachining along the set route, by cooperating with rotation movement of the spindle, the blank can be very smoothly machined into the mirror surface hemispheroid or semi-ellipsoid profile through one-time feed, step-shaped cutter marks caused by multiple engage and retract actions during traditional processing are avoided, further polishing is not needed, and accuracy is uniform.

The invention discloses a fracturing type rock tensile strength test apparatus and method. A test object is a cylindrical soil or soft rock test sample. The fracturing type rock tensile strength testapparatus comprises a mechanical structure and a control apparatus; the test sample is installed between a passive fracturing rod and an initiative fracturing rod which are vertically arranged, and the test sample is centered by virtue of an adjusting centering frame and fit to the passive fracturing rod; the initiative fracturing rod is propelled along a horizontal direction so as to fracture thetest sample; the propelling rate of the initiative fracturing rod is controlled by a rate controller of the control apparatus; a data acquisition module acquires and stores the pressure and displacement data and display the data on a display screen in a graphic manner in real time; and after the test is ended, a data analysis module calculates a tensile strength value. The fracturing type rock tensile strength test apparatus is light and compact in structure; the test needs no additional component, and the system error is small; the test sample is convenient to install, the operation is simple, and the test efficiency is high; and the test sample is vertically arranged and is firm without slippage, the test sample position is stipulated by adopting the centering frame, the generation of deviatoric stress is avoided, the uniformity of the test sample destruction effect is ensured, and the test result is accurate and reliable.

The invention provides a multi-modal composite coding image retrieval method and system, and the method comprises the steps: obtaining to-be-retrieved information, and judging the data type of the to-be-retrieved information; selecting the coarse-grained retrieval or fine-grained retrieval according to the data type of the to-be-retrieved information, wherein the fine-grained retrieval comprises the steps that when the input to-be-retrieved information comprises image description data and text description data at the same time, the two features are fused to obtain composite features, and then data retrieval is conducted through the composite features. According to the method, coarse-grained retrieval or fine-grained retrieval can be selected according to the data type, the composite features can be obtained by fusing the two features, and then data retrieval of fine-grained retrieval is carried out through the composite features; according to the method, the database construction efficiency can be improved, the flexibility of a retrieval mode is improved, the retrieval difficulty is reduced, and a solution which is uniform in precision and generalization performance and more flexible in switching between fuzzy retrieval and accurate retrieval is provided for image retrieval.

The invention discloses a rock-soil parameter random field inversion method. The method comprises the following steps: analyzing conventional statistical characteristics, spatial correlation structures and spatial correlation functions of rock-soil parameters; according to the precision requirement of geotechnical engineering reliability analysis, determining the calculation range of the spatial correlation of the geotechnical parameters; constructing a spatial correlation matrix B according to the calculation range of the spatial correlation and the grid size of the engineering analysis numerical model; solving a coefficient vector c according to the spatial correlation matrix B; utilizing a pseudo-random program to assign an initial random value to each grid of the engineering analysis numerical model, and generating an initial random field; depending on basic inversion equations, performing cyclic operation on each grid in sequence; generating parametric random fields, wherein the basic inversion equation is shown in the specification; wherein x (p, q) = m (p, q) + sigma(p, q) cTu, in the formula, x (p, q) is a parameter random value of any grid (p, q), m (p, q) is a mean valueat the grid (p, q), sigma(p, q) is a standard deviation at the grid (p, q), c is a coefficient vector, and u is an initial random vector which is generated based on an initial random field and influences parameter value at (p,q).

The invention provides a base station frequency regulation method and device. The method includes the steps of obtaining an original local frequency, regulating the original local frequency to obtain a target local frequency, obtaining a digital intermediate frequency according to the target local frequency, a cell center frequency and a fixed intermediate frequency, and regulating a base station frequency according to the target local frequency and the digital intermediate frequency. According to the technical scheme, the system performance is improved, the achievement cost is reduced, the base station frequency is not limited by the frequency accuracy of a local oscillator chip, and configuration methods and configuration accuracy of the base station frequency are unified.

A tenon mortise cutter for solid wood furniture includes a work piece positioning device and an eccentric cutting device. The work piece positioning device includes a work piece fixing mechanism, a tenon mortise length setting mechanism, and a tenon mortise center positioning mechanism. The eccentric cutting device includes a tenon mortise thickness and cutting mode setting mechanism, a caving machine fixing mechanism, and a rotation shaft sleeve. The work piece positioning device and the eccentric cutting device are connected together through the rotation shaft sleeve to work together, and then cutting and machining of a tenon and a mortise can be finished through linear motion and rotation motion.

The invention discloses a bare tobacco seed sower. The front end of the cylinder body is in the shape of an arc cone and is provided with a circular hole (9) with a diameter of 1.6mm-1.7mm. The push needle (6) is arranged on the cylinder. In the body, the front end of the push needle (6) is inserted into the circular small hole (9), and the push needle (6) is provided with a diameter of 0.9 mm-0.8 cm away from the front end. 1.1 mm small hole (8), the rear end of the cylinder is equipped with a cover plate, the rear end of the push needle (6) passes through the cover plate and is provided with a pressing plate, in the A spring (4) is installed between the cover plate and the pressing plate, and a limiter (7) is installed on the push pin on the other side of the cover plate. When the pressing plate is pressed, the The seed loading hole (8) at the front end of the push needle (6) can extend out of the circular hole (9) at the front end of the cylinder; a switch door (1) is provided on the cylinder. The invention relates to a naked tobacco seed planter which can precisely control the seeding quantity in the process of using the bare tobacco seeds to raise seedlings by floating.