444results about How to "Improve calibration efficiency" patented technology

The invention relates to a vector-relation-based method for calibrating single-line laser radar and a CCD camera. Point set information of the laser radar for scanning a V-shaped target is extracted in a laser coordinate system, and direction vectors and intersection coordinates of straight lines in two different planes of the target are obtained by means of straight line fitting; the CCD camera is used for capturing images in a camera coordinate system, target plane equations and an equation of a plane passing through an original point and laser radar scanning lines are obtained by processing image information, a straight-line equation of laser radar scanning is built, and furthermore, the direction vectors and the intersection coordinates of the straight lines are obtained; finally, calibration is finished according to the relations between direction vectors and the intersection coordinates of the straight lines corresponding to the different coordinate systems. According to the method, no object in a calibration scene needs to be moved, collection of all calibration data can be completed at a time, and calibration efficiency is improved greatly. According to the method, the direction vectors of the straight lines of the laser scanning target planes under the coordinate systems of sensors to be calibrated are obtained directly, calibration precision is guaranteed, and meanwhile the calibration algorithm is simplified.

The invention discloses a robot eye-on-hand system structured light plane parameter calibration device and a method. According to the device, a camera and a laser device are installed at the tail end of a robot to form a robot eye-on-hand system, and on the premise of obtaining camera intrinsic parameters, plane parameters of structured light projected by the laser device are calibrated, and thereby structured light three-dimensional vision measurement can be achieved. The robot eye-on-hand system structured light plane parameter calibration method includes that a plane checkerboard target is placed in a calibration area, laser lights are projected on the target to form a first line structured light stripe, the robot is controlled to move in a constraint mode so as to project the laser lights to another position of the target to form a second line structured light stripe, the camera respectively acquires images of two structured light stripes at two calibration positions, the relation of three-dimensional coordinate of points on stripe straight lines under a camera coordinate system at the two calibration positions is calculated, and thereby the structured light plane parameter calibration with the structured light stripe straight lines serving as calibration elements can be achieved.

An accurate calibration method of micro inertia measuring unit by decoupling erection error angle (EEA)with scale factor includes setting up MIMU integral error model and separating couple between EEA of accelerometer and gyroscope and scale factor ,using position error canceling method to calculate out and to separate out scale factor and EEA of accelerometer as well as using least square method and iteration method to calculate out EEA of gyroscope and its relative error items in 10 position static calibration test and in 3 direction positive and negative rate test ,then using interpolation method to calculate out scale factor of gyroscope .

The invention discloses a camera external parameter calibration method of a multi-camera system for solving the problems that a three-dimensional precise calibration object is difficult to manufacture, the efficiency of a multi-camera external parameter calibration process is low, and that accumulative errors are generated in the existing method. The method comprises the following steps: performing fitting to obtain quadratic curve matrixes of shooting ball projections of cameras; solving inhomogeneous coordinates of three spherical centers in a camera coordinate system; establishing a world coordinate system in which the three spherical centers are located on the same plane through the plane where the three spherical centers are located and the positions of the spherical centers; solving external parameters of a plurality of cameras in the world coordinate system in which the three spherical centers are located on the same plane, and accomplishing the external parameter calibration of the cameras in the multi-camera system, wherein the two coordinate systems are overlapped. By adoption of the camera external parameter calibration method disclosed by the invention, the external parameters of the plurality of cameras in the same world coordinate system are calculated quickly, conveniently and accurately without requiring more conversion, no accumulative error is generated, and the camera external parameter calibration precision is high. The camera external parameter calibration method is applied to the fields of image measurement, three-dimensional reconstruction, unmanned aerial vehicle navigation, etc.

The invention discloses a method and device for jointly calibrating the parameters of a visible light camera and an infrared camera. The method comprises steps of: detecting the edges of a visible light image and an infrared image to obtain a visible light edge image and an infrared edge image; acquiring at least four groups of matched point pairs of the visible light edge image and the infrared edge image by using a scale invariant feature transform (SIFT) algorithm; and determining an extrinsic parameter matrix according to the at least four groups of matched point pairs, the intrinsic parameter matrix of the visible light camera, and the intrinsic parameter matrix of the infrared camera. The method and the device may acquire the matched point pairs in the visible light edge image and the infrared edge image without a calibration board and determine the extrinsic parameter matrix without the calibration board so as to reduce the calibration cost of camera parameters. Further, when a focal length of the camera is changed, the extrinsic parameter matrix can be determined without camera position adjustment so that parameter calibration efficiency is increased.

The invention discloses a calibration system of a temperature sensor chip, which comprises a test board and a temperature calibration system, wherein the test panel is provided with a temperature sensor reference chip and a chip to be calibrated; and each chip is connected and communicates with the temperature calibration system through a unified digital interface. The temperature calibration system reads the temperature values of various calibration chips and reference chips through the unified digital interface; and various chips to be calibrated simultaneously acquire the data, thereby realizing synchronous acquisition and calibration of multichip data, greatly improving the acquisition efficiency of the data and reducing the test and calibration time of the chips and calibration cost. The invention has the advantages of simple structure, easy building, short calibration time, high calibration efficiency, low cost, high degree of automation and the like. The invention also discloses a calibration method of the temperature sensor chip.

The invention is suitable for the digital image processing field and provides a fish-eye lens correction method and device and a portable terminal. The method comprises the following steps: carrying out distortion correction on a fisheye image through an equidistant projection model to obtain an initial correction image, the image content of which is a calibration board; obtaining all angle pointsof the calibration board from the initial correction image, re-projecting angle point coordinates to the fisheye image to obtain rough angle point coordinate values of the calibration board in the fisheye image, and serving the angle points as feature points in the fisheye image; and carrying out iteration on the feature points in the fisheye image to obtain different parameter values within a preset parameter range, carrying out correction on the fish-eye lens through the equidistant projection model, and serving the parameter value obtained when the deviation amount is minimum as an accurate correction value of the fish-eye lens. The fish-eye lens correction method reduces preparation workload in the early stage, and is simple in operation process; a camera does not need to change position and angle; and the fish-eye lens correction method is wide in application range, does not need to set a lot of parameters, is simple to calculate, and meanwhile, realizes an accurate fisheye correction effect.

The invention discloses a differential mobile robot milemeter calibration method. The method comprises the steps that 1, a robot walks in a preset region, and position locating is conducted on a vehicle through a motion capture system; 2, walking displacement of the robot is transmitted to a processor, and meanwhile walking displacement calculated by a robot milemeter is read; 3, a compensating parameter is calculated on the basis of the robot walking displacement obtained from the motion capture system and the walking displacement calculated by the milemeter, and then the motion capture system is compensated; 4, the steps from the first to the third are repeatedly conducted to continuously iterate and correct the compensating parameter till a walking route of the robot is consistent with a set walking route. Therefore, the technical effect that the differential mobile robot calibration efficiency and precision are high is achieved.

The invention provides a collaborative robot hand-eye relation automatic calibration device and method. The calibration device comprises a collaborative robot force control pulling teaching button, acalibration probe, a calibration plate with a marker and a calibration system, wherein the calibration system is mainly used for controlling the robot button to move according to a preset track; target points in the preset track automatically acquire pixel coordinates of the center point of the marker and coordinate dot pairs of a robot; and calibration parameters are calculated according to the obtained multiple dot pairs. The calibration method comprises the steps of placing the calibration plate; pulling the collaborative robot to a teaching point and recording coordinates of the robot; pulling the collaborative robot to an initial photographing point, recording the coordinates of the robot and configuring a matched template; controlling the robot to continuously change the photographing point and acquiring the coordinates of the robot and the pixel coordinate dot pairs of the marker; and calculating the calibration parameters. Through the collaborative robot hand-eye relation automatic calibration device and method, the hand-eye relation of the collaborative robot can be conveniently and quickly calibrated, the calibration precision is high, and the collaborative robot hand-eyerelation automatic calibration device and method have the important significance in industrial grabbing and application of the collaborative robot.

The invention relates to an automatic calibration system for urea metering jet pumps, and the system comprises an urea tank, a metering jet pump, a weighing device, a container, a jet pipeline, a reversing valve, a return pipeline and a control module, wherein the container is arranged on the weighing device, and the jet pipeline is arranged at the downstream of the metering jet pump; the urea tank, the metering jet pump and the container are sequentially communicated through pipelines, the reversing valve is arranged at the downstream of the metering jet pump, the jet pipeline is communicated with the reversing valve and the container, and the return pipeline is communicated with the reversing valve and the urea tank; and the control module is electrically connected with the reversing valve, and controls the reversing action of the reversing valve. The invention also relates to a calibration method of the automatic calibration system for the urea metering jet pumps. The system disclosed by the invention is simple in structure and convenient in automatic control operation, and does not cause human errors, thereby greatly improving the calibration efficiency and the calibration precision.

The invention relates to the flexible pressure sensor production field and especially relates to a calibration method of a flexible pressure sensor. The method comprises the following steps of determining a response characteristic value and designing a corresponding acquisition system; using an airbag device to exert more than twice of pressure with a same pressure value on the flexible pressure sensor and acquiring a corresponding response characteristic value sequence under the pressure value; calculating an average value and acquiring an average response characteristic value with a small error so as to acquire a corresponding table of the pressure value and the response characteristic value; and according to a characteristic curve of the flexible pressure sensor, selecting a type of a flexible pressure sensor calibration line, and carrying out data fitting on the corresponding table of the pressure value and the response characteristic value so as to acquire a calibration line. In the invention, during a whole process, through numerical control or a computer, operation and calculation can be realized; calibration efficiency is greatly increased; and acquired result accuracy is high.

The invention relates to a global calibration method for a vision-guided camera of a laser tracker. The method comprises the following steps: establishing a camera coordinate system, an image coordinate system, a laser tracker coordinate system and a target coordinate system; projecting a laser beam onto a plane target, and forming an image on the vision-guided camera, and repeatedly moving a target to obtain the linear equation of the laser beam in the camera coordinate system; obtaining laser tracker motion parameters, namely obtaining the linear equation of the laser beam in the laser tracker coordinate system; after the equations of multiple laser beams are obtained, obtaining a conversion relation between the camera coordinate system and the laser tracker coordinate system. The global calibration method disclosed by the invention is simple in operation, and can complete calibration by using one plane target, so that the speed of the global calibration is improved, and errors because calibration objects are repeatedly measured by a spherical reflector are avoided, so that calibration results are more accurate.

The invention relates to a calibration device of a pull-press integrated sensor. The calibration device of the pull-press integrated sensor comprises a rack, wherein a loading mechanism is assembled on the top of the rack. The loading mechanism comprises a driving device and an executing mechanism, wherein the executing mechanism is connected with the driving device and used for outputting up-and-down straight line motion. The executing mechanism comprises a dowel bar, wherein the dowel bar is arranged at the tail end of the executing mechanism, a standard pressure sensor is arranged on the dowel bar, a base seat which is used for supporting and holding a to-be-demarcated pressure sensor is assembled at the tail end of the dowel bar. A baffle is arranged on the upper portion of the base seat. The baffle is assembled on the dowel bar of the executing mechanism anti-dropping in a dipping-and-heaving mode. A first connector which is used for being connected with one end of a to-be-demarcated tension sensor is fixedly connected on the baffle. The first connector and the baffle are in driving connection synchronously in the same direction when the to-be-demarcated device works. A second connector which corresponds to the first connector is assembled on the lower portion of the base seat on the rack. The calibration device of the pull-press integrated sensor is capable of carrying out demarcating to a tension sensor and a pressure sensor at the same time, convenient and swift, simple in structure and capable of improving demarcating efficiency.

The invention relates to a reading recognition measurement method for a pointer-type instrument based on a machine vision system, and belongs to the technical field of instrument measurement. The method comprises the steps: building a visual imaging system model for a plurality of pointer-type instruments; employing a CCD camera plane calibration method to calibrate the internal parameters and distortion parameters of a camera and the external parameters of a pointer-type instrument dial plate; rotating an pointer-type instrument image to a position where the pointer-type instrument image is parallel to the pointer-type instrument dial plate through the external parameters of the pointer-type instrument dial plate; translating each pointer-type instrument image to a position nearby an optical center, and extracting the scale and the position of a pointer and the center of each pointer-type instrument image through the image processing technology; and obtaining the reading of the pointer-type instrument through an angle method. The method is advantageous in that the method employs the visual measurement technology, eliminates the perspective projection distortion through image rotation, improves the measurement precision, and is suitable for the measurement of the reading of a plurality of instruments at the same time through one camera. The method achieves the high-precision intelligent detection, improves the reading efficiency of the instruments, and improves the calibration efficiency of the camera.

The invention relates to the field of medical monitoring device testing, and provides a flow sensor calibration method. The method comprises the following steps that 11, a differential pressure sensor is adopted for detecting differential pressures corresponding to multiple fluid flows, a flow-differential pressure curve within a testing range is obtained, and the fluid flows are detected through the flow sensor to be calibrated; 12, the testing range is segmented, fitting of the flow-differential pressure curve is performed within the multiple segmented testing ranges, multiple segmented fitting curves are obtained, and calibration coefficients are determine; the segmented fitting curves are simple linearity curves or quadratic linearity curves. The invention further provides a flow sensor calibration system adopting the calibration method. The flow sensor calibration efficiency is high, errors are small, and the consistency is high.

The invention discloses a large-size plate forming online measurement system and method based on machine vision, and belongs to the technical field of non-contact measurement. The large-size plate forming on-line measuring system comprises a sliding rail, a side support, a cross beam, a sensor support, a three-dimensional displacement sensor, a motion control system and an industrial personal computer. The method comprises a three-dimensional displacement sensor calibration algorithm based on a laser interferometer, a three-dimensional point cloud data splicing algorithm, a three-dimensional point cloud data preprocessing algorithm, a three-dimensional point cloud data segmentation algorithm, model reconstruction and curved surface fitting. According to the invention, a three-dimensional point cloud data splicing mode is adopted to realize measurement of a large-size plate, and the measurement range of the measurement system is increased on the premise of ensuring high precision.

The invention discloses a quick correcting system and method for static performance of a pressure sensor. The quick correcting system and method are mainly used for realizing the quick correcting and screening in the batch production of small pressure sensors and change the manual or semi-automatic operation in the traditional correcting process into automatic operation. The quick correcting system is composed of a computer, a high-speed data acquisition unit, a pressure pump, a pressure controller, a gas storage tank with a large holding cavity, a pressure pipeline, a pressure vessel with a small holding cavity, a pressurization solenoid valve, an unload solenoid valve, a pipe diameter coarse adjusting valve, a pressure valve and valve drivers. The computer controls the pressure pump to provide a pressure source for the gas storage tank with the large holding cavity, the valve drivers drive the valves to regulate the pressure change of the system to form controllable first-order variable pressure in the pressure vessel with the small holding cavity and act on a corrected pressure sensor in the pressure vessel with the small holding cavity, so that the output pressure is changed in the mode of according with the time. The high-speed data acquisition unit measures the voltage parameters output from the corrected pressure sensor, and an automatic correcting software displays and records the voltage parameters at real time.

The invention relates to a correction method of an LED display screen. The correction method comprises: sizes of modules for correction and a separated module collection mode of an LED display screen are determined; the LED display screen is controlled to be lightened and primary-color image collection is carried out, wherein each lightened correction module contains a plurality of controlled lightened same-color LED lamp points with continuous positions; according to the collected primary-color image, an initial brightness module or an initial brightness chromatic value of each lightened correction module is obtained and a brightness correction target value or a brightness chromatic correction target value is determined correspondingly; and on the basis of the initial brightness module or an initial brightness chromatic value of each lightened correction module as well as the corresponding brightness correction target value or a brightness chromatic correction target value, brightness correction coefficients or brightness chromatic correction coefficients of the multiple same-color LED lamp points in each correction module are obtained and are applied to the LED display screen. According to the invention, the number of LED lamp points for single-time collection is increased by using a separated module collection way and the number of times of image collection is also reduced; the correction time can be shortened; and the correction efficiency can be improved.

The invention discloses a calibration method and device of a blade digitalized templet detection system, and relates to the technical field of visual measurement. The method comprises that camera calibration is carried out on first and second visual sensors; laser knife planar calibration is carried out on the two visual sensors; motion direction calibration is carried out on the two visual sensors according to camera and measurement parameters; the camera parameters of the two visual sensors are converted into a measurement coordinate system; the position relation of the two visual sensors iscalibrated; the measurement parameter in the measurement coordinate system of the second visual sensor is converted to the measurement coordinate system of the first visual sensor; the system coordinate system is calibrated; and the measurement coordinate system of the first visual sensor is converted to the system coordinate system. The calibration method is complete.

The invention relates to the field of display, and provides an image distortion correction method and apparatus, a computer readable medium and an electronic device. The image distortion correction method comprises the steps of forming a correction network on an imaging screen of a display apparatus, wherein the correction network comprises multiple to-be-adjusted grid points; establishing a two-dimensional coordinate system on the correction network; moving other to-be-adjusted grid points located on and outside a circle taking an original point of the two-dimensional coordinate system as thecenter of the circle and taking the distance between one of the to-be-adjusted grid points and the original point as the radius, thereby correcting image distortion. By manually adjusting the image distortion correction network, a relatively good correction effect is achieved, and the display quality and the user experience are improved.

The invention discloses a river plane two-dimension current model roughness calibration method comprising the following steps: 1, delimiting roughness zones according to river plane features, and initializing the roughness in each zone; selecting the present flow rate with to-be-calibrated roughness and the corresponding river reach outlet water level; using a river plane two-dimension current mathematics model to carry out water-power calculation; determining errors between a model calculated value and an actual measurement value of each monitoring point water level; determining whether the water level error is small enough or not; determining a water pass area according to the water depth, and using all monitoring point water level error interpolation to estimate the water level errors between all grid points in the water pass area; using a dichotomy to adjust the roughness of the grid points in the water pass area according to the water level errors of all grid points in the water pass area; further determining whether all to-be-calibrated flow rates have been calibrated or not; if yes, finishing roughness calibration, and storing the roughness calibration result. The method can reduce artificial interferences in an iteration trial process, thus solving the problems that an existing method is unclear in technical process, rigid in conditions, and hard to apply.

The invention relates to the technical field of vision inspection devices and particularly relates to a vision inspection device convenient assembly and disassembly of a tray. The vision inspection device comprises a rack, a Z-axis mechanism and a horizontal movement mechanism, wherein the Z-axis mechanism is provided with a camera; the horizontal movement mechanism is provided with a tray clamp; the tray clamp comprises a clamp body arranged on the horizontal movement mechanism; the clamp body is provided with a containing cavity; the front side edge and an adjacent edge of the front side edge of the containing cavity are respectively provided with a front pressing strip and a side pressing strip which are detachable; one side edge of the clamp body is provided with a screw hole in which a screw is installed; both the front pressing strip and the side pressing strip are provided with a through hole; the screw is in threaded connection with the screw hole after penetrating through the through hole; the screw is sleeved with a spring; one end of the spring pushes against the end part of the through hole; and the other end of the spring pushes against the head part of the screw. The vision inspection device can be used for not only assembling and disassembling an IC (integrated circuit) tray rapidly, but also calibrating the position of the IC tray conveniently, and the vision inspection device is simple in structure and strong in practicability.

The invention discloses a vehicle electric control suspension height automatic calibration method. The vehicle electric control suspension height automatic calibration method comprises the following steps: a calibration device is connected with a vehicle suspension control device; the calibration device respectively detects height values of multiple detecting points of a vehicle through a detector; the calibration device generates a control instruction according to the height values of the multiple detecting points; and the calibration device sends the corresponding control instruction to the suspension control device, so that the suspension control device controls according to the control instruction. The method can save the labor cost and the time cost, improves the calibration efficiency, and can greatly improve the production efficiency in large-batch offline vehicles. The invention further discloses a vehicle electric control suspension height automatic calibration system and the calibration device.

The invention discloses an error compensation method for an inertial measurement unit, which is capable of improving measurement accuracy and is also capable of rapidly being implemented rapidly so as to improve the production efficiency of the inertial measurement unit. The method comprises the following main steps of fixing the inertial measurement unit on a three-axle table so as to determine the mounting standard; determining the coarse calibration zero coefficient and coarse coefficient proportionality coefficient of the inertial measurement unit; placing the inertial measurement unit into a high-low temperature tank to determine the temperature Monomial coefficient and temperature quadratic term coefficient; fixing the inertial measurement unit on the three-axle table to determine the error coefficient of the proportionality coefficient; determining the inertial measurement unit cross-coupling coefficient; collecting one-hour inertial measurement unit output to determine the random error coefficient; and finally testing the repeatability of the inertial measurement unit.

Disclosed is a roll gap calibration method for lightly pressing down a tension leveler in square billet continuous casting. The roll gap calibration method for lightly pressing down the tension leveler in the square billet continuous casting includes: a, selecting a standard chain pole as a calibrator, and setting a calibration reference value which comprises calibration pressure values and a calibration thickness value; b, starting the calibrator to complete a calibration motion, and reading and recording an actual detection value; c, calculating a deviation value according to the calibration reference value and the actual detection value, and performing correction and compensation according to the deviation value, wherein the calibration pressure values in the step a are respectively a minimum pressure value and a maximum pressure value, a pressure interval value is constituted by the minimum pressure value and the maximum pressure value, and the correction and the compensation in the step c are performed according to a two point linearity correction algorithm, and confirmed according to a linear function relationship between pressure and the thickness. The roll gap calibration method for lightly pressing down the tension leveler in the square billet continuous casting is achieved by using the multiple segment calibrator to achieve positioning once and automatically calibrating the pressure of multiple points, improves roll gap calibration accuracy when the tension leveler is pressed down in the square billet continuous casting, shortens calibration time, and improves calibration efficiency.

The invention discloses a robot tool coordinate system calibration method based on planar constraints. The robot tool coordinate system calibration method comprises the steps of: setting a motion modeof a robot; establishing a base coordinate system B, an end coordinate system E and a tool coordinate system T; establishing a planar constraint condition; ensuring that an irradiation point is always on a marble platform, keeping the attitude of the end coordinate system E unchanged, and controlling the position of the end coordinate system E to change for six times; ensuring that the irradiation point is always on a marble platform, keeping the position of the end coordinate system E unchanged, and controlling the attitude of the end coordinate system E to change for three times; and solving an irradiation point coordinate equation. During the tool coordinate system calibration process, the calibration of the tool coordinate system can be completed by solving the irradiation point coordinate equation of a laser displacement sensor, the solving of the irradiation point coordinate equation only needs to complete the measurement of 9 sets of data, the calibration efficiency is high, and the laser displacement sensor is utilized for distance detection to ensure sufficient calibration precision of the tool coordinate system.

The invention discloses a phase measuring profilometry system nonlinear correction method combining geometric calibration. According to the phase measuring profilometry system nonlinear correction method combining geometric calibration, a target is scanned through the phase measuring profilometry to obtain an accurate phase, average brightness and brightness modulation, the accurate phase and the average brightness are utilized to calibrate a protector and a camera shooting device respectively, nonlinear response of the projector is obtained according to the accurate phase and a shot structured light image to establish a gray level lookup table, the gray value of the image is pre-compensated by utilizing the gray level lookup table before three-dimensional scanning is carried out on the projected structured light image, and therefore the purpose of carrying out nonlinear correction on a measurement system is achieved. The phase measuring profilometry system nonlinear correction method combining geometric calibration can be used for geometric calibration and nonlinear correction of the phase measuring profilometry system, organically combines geometric calibration of the measurement system and nonlinear correction, and has the advantages of convenient operation, high correction accuracy and high execution efficiency.

The invention puts forward a three-dimensional scanning measurement device of a robot, and a working method. The three-dimensional scanning measurement device of the robot comprises a front end measurement device and an image processing terminal, wherein the front end measurement device is installed on the tail end mechanical arm of a robot installed above a calibration table; the bottom of the tail end mechanical arm is provided with a tail end tool; the calibration table is provided with a calibration board; the image processing terminal is in communication connection with the front end measurement device and the controller of the robot; and the controller of the robot is connected with a demonstrator. The working method comprises the following steps of: through a calibration method, obtaining a transformation relationship between an image coordinate system and a robot coordinate system, and obtaining a three-dimensional model of a tested workpiece through a measurement method. The three-dimensional scanning measurement device of the robot has the following advantages that the online measurement of the workpiece is realized, measurement data is fed back to the controller and is used for the route planning and the movement compensation calculation of the robot, and the machining precision and the working efficiency of the robot are improved.

The invention provides an automatic calibration device of a static electric field sensor and a calibration method thereof. A three-dimensional electric field sensor test supporting seat is adopted so as to realize calibration and testing to a three-dimensional electric field sensor. Simultaneously, the device is also a multi-mode automatic calibration device, and compatibility and flexibility are good. Functions of automatic adjustment of a high voltage power supply output voltage, arbitrary arrangement of electric field measurement points and adjusting time intervals, automatic acquisition of electric field data, processing and the like are realized and calibrate efficiency and precision of the electric field sensor are greatly increased. A slide rail is used to connect a test pole plate structure and a shielding structure box body, and during calibration, operation is convenient and maintenance is easy. A conductive metal wire and an equal voltage division resistor string are arranged so as to increase the calibration precision. A temperature sensor and a humidity sensor are arranged in an electric field test box so that an important reference basis is provided for electric field sensor environment adaptability research.

The invention relates to a mobile terminal calibration method which is used for AGC (automatic gain control) calibration and APC (automatic power control) calibration of a mobile terminal. The method includes: controlling a comprehensive test instrument and the mobile terminal to be synchronous through a console; after synchronization is completed, sending a first communication signal by means of a series of designated APC control words and a series of frequency points at a first designated time slot on the mobile terminal according to setup of the console; measuring signal intensity of a second received communication signal by means of a series of designated AGC control words and a series of frequency points at a second designated time slot; synchronously measuring the power of the second communication signal of multiple power levels at the second designated time slot and frequency points on the instrument according to setup of the console and measuring the power of the first communication signal sent to the mobile terminal at the first designated time slot and frequency points; and calculating and judging on the console according to measurement values fed back by the instrument and the mobile terminal and outputting final results to the mobile terminal for storage.