69results about How to "Improve absolute accuracy" patented technology

The invention relates to a positioning device and a positioning method for a rail traffic vehicle. The positioning device comprises a laser displacement sensor, a rail vehicle traveling distance detection unit and a synchronous acquisition and data processing unit, wherein the laser displacement sensor and the rail vehicle traveling distance detection unit are respectively connected with the synchronous acquisition and data processing unit. In the method, the distance between the vehicle and a rail is detected by using an on-vehicle laser displacement sensor; the traveling distance of the vehicle is obtained by the output of a wheel shaft pulse sensor or two on-vehicle laser displacement sensors; and finally, rail characteristic data is acquired by using an on-vehicle data acquisition processing module. The acquired rail characteristic data is matched with the historical data of rail characteristics to realize high-precision absolute or relative positioning.

The invention is related to a laser diode based multiple beam laser spot imaging system for characterization of vehicle dynamics. A laser diode based, preferably VCSEL based laser imaging system is utilized to characterize the vehicle dynamics. One or more laser beams are directed to the road surface. A compact imaging system including an imaging matrix sensor such as a CCD or CMOS camera measures locations or separations of individual laser spots. Loading status of vehicles and vehicles' pitch and roll angle can be characterized by analyzing the change of laser spot locations or separations.

The invention discloses a two frequency signal flying time measuring method and the device that emits two frequency signal superposing signal preset in D / A, emitting time span is tp and starting timing, receiving signal of returning after a time span until the signal intensity is 5-10 times over the background noise stopping timing, taking A / D converting, and calculating the accurate flying time. The device includes power supply, signal emitting module, signal receiving module, calculating module, D / A, A / D, and synchronization controller. The invention has the advantages of wide range, high accuracy, and high dynamic response speed.

The invention relates to a motorcade driving method based on roadside equipment. The method comprises steps of enabling the roadside equipment to be disposed at a roadside, enabling at least one following vehicle to follow one pilot vehicle, forming a motorcade, enabling the following vehicle to be a low-grade automatic driving vehicle, and enabling the pilot vehicle to be a high-grade automatic driving vehicle; enabling the pilot vehicle receive the high-precision map information sent by roadside devices and carry out planning driving, enabling each vehicle in the motorcade establish communication with at least two roadside devices and periodically obtain position coordinates of the vehicle based on a signal propagation power loss model, and forming a driving track of the vehicle; enabling each vehicle share the driving track with an adjacent following vehicle behind through wireless communication, and enabling each following vehicle drive along the driving track of a previous vehicle. Compared with the prior art, the method has advantages of high safety, high sensitivity, high error-tolerant rate and the like.

The invention relates to a field measurement device of wave aberration of a projection objective in a photo-etching machine. The device is based on the shack-hart mann measurement principle, and comprises a host machine and a standard lens, wherein the host machine comprises a photoelectric sensor, a diffraction optical element, a collimator objective, a pinhole maskplate provided with a round hole, and a beam splitting device used for controlling light path transmission; the standard lens includes a first standard lens used for folding back light path when in systematic error of the demarcated host machine, and a second standard lens used for folding back the light path when the wave aberration of the projection objective is measured by the host machine. The host machine and the first standard lens are integrated on a reticle mask stage of the photo-etching machine, and the second standard lens is integrated on a silicon chip stage; when in measurement, the silicon chip stage and the reticle mask stage are moved to the measuring position for measuring and correcting the wave aberration of full view field of the projection objective in the photo-etching machine. The field measurement device has higher absolute measuring accuracy, is suitable for the field measurement of the wave aberration of the projection objective in the photo-etching machine, reduces the cost, the volume and the weight of the device, and is convenient for integration.

A laser level with temperature control device (2) and the temperature control method thereof are disclosed. The temperature control device includes a thermal insulation chamber (22), a thermoelectric cooler (25), a control unit (21), and first and second temperature sensors (23, 24). The second temperature sensor is received in the thermal insulation chamber together with a tilt sensor (12). The control unit controls operation of the thermoelectric cooler according to the external and internal temperature signals respectively output by the first and second temperature sensors, so as to adjust the internal temperature inside the thermal insulation chamber to be a calibration temperature point close to the external temperature. Accordingly, the temperature drift problem can be addressed, and the working temperature of the tilt sensor can be maintained in a stable range. Further, the acceptable ambient temperature range within which the tilt sensor works can be expanded.

The invention discloses an analog front end device includes a calibration unit and at least a conversion circuit. The conversion circuit includes a clamper, a multiplexer, an voltage buffer and an analog to digital converter. The clamper receives an image signal and resets the DC voltage level of the image signal to generate a clamped signal. The multiplexer receives the clamped signal and a test signal and outputs the clamped signal or the test signal according to a selecting signal. The voltage buffer amplifies the clamped signal or the test signal to generate a buffer signal. The analog to digital converter converts the buffer signal into a digital signal. The calibration unit generates a gain correction value according to the test signal and calibrates the gain offset of the digital signal according to the gain correction value.

The invention discloses a composite phase discriminator and its method. The method compounds the simple phase demodulation time method and the counting time method, which sends a group of signal with the period number of the same frequency f and receives the returned receiving signal after a period time of flight, it rough estimates the receiving signal reference time t0 and then computes the phase position ªŽof the signal by the computing module and quotes the signal period number of the t0 point position distance receiving signal real start point to compute the accurate flight time tfly; the composite phase discriminator comprises a power, a signal sending module, a signal receiving module, a computing module and a D / A and A / D, wherein the holding controller controls the D / A and A / D; the signal sending module and the signal receiving module work synchronically.

The invention relates to a method for offline acquisition of an airborne InSAR (Interferometric Synthetic Aperture Radar) motion error by utilizing a high-precision POS (Position and Orientation System). The method comprises the steps of acquiring location information of and below quadratic term, of an SINS (Ship's Inertial Navigation System) center by utilizing a combined measurement result of the SINS and a GPS (Global Positioning System) in the high-precision POS; acquiring location information above the quadratic term, of the SINS center by employing a purely inertial measurement result of the SINS; adding the calculated location information of and below the quadratic term to the calculated location information above the quadratic term and compensating a lever arm effect error; calculating high-precision smooth location information of two antenna phase centers of the airborne InSAR; then, subtracting a first-order polynomial fitting result from the high-precision smooth location information; and finally acquiring the motion error of the two antennas of the airborne InSAR. The method provided by the invention has the characteristics of high precision and simplicity for calculation, and can be used for offline calculation of the motion error of the airborne high-precision InSAR in order to realize high-precision offline imaging for the airborne InSAR.

A method and an apparatus for ascertaining the working point of switchover valves of a hydraulic system of a vehicle, in particular of a hydraulic brake circuit, are described in which the hydraulic system contains at least a pressure generating arrangement, a high-pressure switching valve, a switchover valve, and an admission pressure sensor, an admission pressure that is higher than the target pressure of the switchover valve being established, the switchover valve being energized with a target current corresponding to the target pressure, admission pressure being reduced until the switchover valve closes, with the switchover valve closed, a nominal admission pressure being established as an admission pressure, after the switchover valve opens, a pressure difference Δp between admission pressure and a circuit pressure being sensed, and on the basis of the pressure difference Δp, the working point being ascertained.

The invention relates to a piston cylinder device, especially a piston cylinder device used in a separation system in a motor vehicle. The piston cylinder device comprises a cylinder forming a housing. A piston is arranged inside the cylinder in a way to be capable of axial movement. A switching point sensor is fixed on the housing in order to perform displacement measurement on the piston. The switch point sensor is effectively connected with a component arranged on the piston and used for activating a switch point on the switch point sensor. In the piston cylinder device which can be realized in a low-cost ay, the switch point sensor forms a Hall sensor which is provided with a permanent magnet to set a preset magnetic flux. The component activating the switch point of the Hall sensor is composed of an iron magnet. Therefore, when the piston of the component bearing the iron magnet approaches the Hall sensor, the preset magnetic flux passing through the permanent magnet is changed.

The invention discloses a calibration method and system for surgical robot TCP (Tool Center Point), and a storage medium. The calibration method comprises the following steps: inputting a coordinate value of a TCP and included angle parameter values between a channel axis passing through the TCP and X, Y and Z axes of a coordinate system B into TCP parameters of a mechanical arm; and fixing a laser head in a channel of an end-of-arm tooling, controlling the mechanical arm to pull up the laser head from a point A to a point B, reading out the moving distance of laser on a PSD through a PSD dataacquisition system, wherein the moving distance of the laser on the receiving surface of a PSD position sensor is delta X or delta Y, and compensating arctan (delta X / H) or arctan (delta Y / H) to theTCP parameters of the mechanical arm. The method belongs to non-contact calibration, greatly avoids the defects of traditional contact calibration, is simple and convenient to operate, and meanwhile,can quickly and accurately realize calibration of the TCP of a robot so as to improve the absolute precision of the robot.

The clamping apparatus comprises a chuck member for holding an element to be clamped thereto that is provided with a centering disc member that is elastically resilient in Z-direction and that defines at least one aperture. The element to be clamped is provided with a clamping bolt member having a centering portion in the shape of a truncated cone. Upon insertion of the clamping bolt member into the aperture of the centering disc member, the centering portion engages the edge of the aperture in the centering disc and aligns the element to be clamped in the X- and Y-directions. The centering disc member is located behind an end plate member of the chuck member, and the surface of the end plate member constitutes the Z-reference for the element to be clamped. The end plate member is provided with an aperture through which the clamping bolt member can be inserted into the aperture of the centering disc member.

The invention discloses an industrial robot positioning precision calibration method, device and system, and the method comprises the steps: S101, respectively obtaining the actual positions and theoretical positions of a robot at n sampling points; S102, performing difference processing on the actual position and the theoretical position to obtain error values of the robot at n sampling points; S103, taking the theoretical position of the robot as an input layer, taking an error value corresponding to the theoretical position as an output layer, training a hidden layer by adopting an optimalpruning extreme learning machine model, and establishing an error model; S104, inputting a target position to be reached by the robot into the error model, and calculating a deviation value of the target position; S105, superposing the target position to be reached by the robot with the compensation value corresponding to the position to obtain an expected target position of the robot. Motion parameters of the industrial robot control system do not need to be modified, the development degree of the industrial robot control system is reduced, and the use cost of enterprises is reduced.

A semiconductor integrated circuit is characterized in that it comprises analog macros each having a comb capacitor (10), each comb capacitor (10) is composed of comb-shaped electrodes (11, 12), the comb tooth portions (13) of the electrode (11) and the comb tooth portions (14) of the electrode (12) are so interdigitized that the comb tooth portions (13) and the comb tooth portions (14) are alternated and parallel to one another, and the tooth portion intervals (S) are varied according to the absolute accuracy indicating the difference between the actual capacitance and the ideal capacitance or the relative accuracy indicating the differencebetween the capacitances of the adjacent comb capacitors. A high-accuracy analog macro comprising a comb capacitor whose high capacitance accuracy is ensured and a semiconductor integrated circuit comprising highly-integrated analog macros are provided.

The invention provides an industrial robot kinematic calibration method based on a coordinate measuring instrument. The method comprises a main control module, a power supply module, a display module,a storage module, a bluetooth module and a positioning module. One end of the bluetooth module is connected to the main control module, and the other end of the bluetooth module is wirelessly connected with a bluetooth tag arranged on the body of a worker; the positioning module is connected with the main control module; and the main control module is connected with the display module and the storage module. Through the design of the bluetooth tag, the device is simple in structure, cheap in price, easy to integrate and can be widely used.

The invention discloses a moon control network establishment method, comprising the steps of: step 1, obtaining image data of the lunar surface and corresponding ephemeris data and attitude data; step 2, extracting corresponding image points from image data from different viewing angles of a same orbit and image data of adjacent orbits by using an automatic image matching technology; step 3, by employing the data and the corresponding image points, performing adjustment processing for a survey area to form the ground stereo model of the whole survey area; step 4, performing adjustment processing for the whole moon after the adjustment processing is performed for survey areas; step 5, laying control points on the whole moon according to an established regular grid, then, calculating the selenographic coordinates of the control points according to parameters of the adjustment of the survey areas and the adjustment of the whole moon. The establishment method for the moon control network focuses on specific requirements for 1: 2,500,000 or larger scale lunar mapping, solving the problems of scale change and absolute orientation of the control network and improving the absolute accuracy of the control network.

A static balance device of vanes on rotating machinery belongs to the technical field of mechanical engineering and comprises a base, a support column, a fixed support plate, a thrust bearing, a mandrel, a clip and strain gauges, wherein the support column is fixedly arranged on the base; the fixed support plate is fixedly arranged at the upper end of the support column; the strain gauges are arranged at the side at the lower end of the support column; the thrust bearing is arranged in the fixed support plate; and the mandrel is connected with the clip and the thrust bearing respectively. Relative to measurement, the device can accurately measure the static moment difference between the two large-mass vanes to be measured of the large rotating machinery and the center and can carry out balancing while measuring, thus overcoming the defect the traditional moment instruments of the vanes to be measured have lower absolute accuracy when measuring large-mass objects, can only measure the absolute but can not carry out balancing while measuring. The device has reliable performance and greatly improves the measuring accuracy.

The invention relates to a method for detecting the position of a mask holder (1) for masks (2) for photolithography, comprising the following steps: Positioning the mask holder (1) with masks (2) ona measuring table of a measuring device; measuring the mask holder (1) by means of an algorithm; recording the absolute position of the mask holder (1) on the measuring table and capturing and recording at least one reference image.

The invention relates to an automatic calibrating system for an industrial robot. The automatic calibrating system for the industrial robot comprises the to-be-calibrated industrial robot connected with a robot electrical control cabinet, and is characterized by further comprising a T-Mac device from the Leica company at the tail end of the industrial robot, a laser tracker from the Leica companyis arranged right in front of the industrial robot, the T-Mac device is connected with a controller of the laser tracker, the automatic calibrating system for the industrial robot further comprises anI / O communication box, an I / O module of the robot electrical control cabinet is connected with the I / O communication box, the I / O communication box is then connected to an upper computer, and the upper computer is in wireless communication with the laser tracker. The invention further relates to an automatic calibrating method for the industrial robot.

The invention discloses a calculation method of MOA resistive fundamental current increase rate based on resultant vectors. Firstly the initial inclined angle theta of the fundamental current and thevoltage vector is solved according to the leakage current resultant vectors I<arrowhead><a+b>, I<arrowhead><a-c> and I<arrowhead><c+b> of three-phase doped coupled capacitive current; then the inclined angles alpha, beta and gamma between the resultant vectors I<arrowhead><a-c> and I<arrowhead><a+b>, I<arrowhead><a+b> and I<arrowhead><c+b> and I<arrowhead><a-c> and I<arrowhead><c+b> are determined, and the phase of arrester resistive current increase is judged according to the change trend of the inclined angles alpha, beta and gamma; and finally the increment of the corresponding phase resistive current fundamental wave is solved according to the phase of arrester resistive current increase and the initial inclined angle theta of the current vector and the voltage vector. According to themethod, the influence of the interphase coupling capacitance on resistive current measurement can be eliminated without the influence of the voltage phase.

The embodiment of the invention discloses a pose optimization method and device, electronic equipment, a medium and a program product. The method comprises the steps of obtaining more than two times of collection data for the same road, and one time of collection data comprising feature points of a key frame image and corresponding initial pose data; grouping different times of acquisition data, and aligning different times of acquisition data in the same group to obtain first optimized pose data; carrying out pose map optimization on the first-time optimized pose data to obtain second-time optimized pose data, and pose map optimization at least comprising inter-frame relative pose constraints between key frame images with a common-view area between two times of acquired data; and finally, performing global light beam adjustment method optimization, so that the precision of the pose data is gradually improved. According to the technical scheme, the absolute precision and the relative precision of the overall pose can be improved, the pose data with higher precision can be recovered, a good basis is provided for high-precision map element reconstruction, and a high-precision map with higher precision can be reconstructed.

The invention discloses an angle transmission error compensation method and device and a computer readable storage medium, and the method is applied to a robot, and comprises the following steps: obtaining a planned joint angle nominal value of the robot at the current moment of motion, and setting a joint number; acquiring an angle transmission error of a joint end corresponding to the joint number; the planned joint angle nominal value corresponding to the joint number is substituted into a preset angle conveying error model, and an angle compensation value of the joint end is obtained based on a preset iterative algorithm; and correcting the angle transmission error according to the angle compensation value, generating a planning instruction according to the corrected angle transmission error, and issuing the planning instruction to an execution unit to complete angle compensation of the joint end corresponding to the joint number. By implementing the method and the device, the angle transmission error of the robot joint is compensated, and the influence of the angle transmission error on the joint precision is eliminated, so that the track precision of the robot during continuous movement is improved.

The invention relates to the technical field of laser frequency stabilization, in particular to a high-stability polarization spectrum frequency stabilization device suitable for polarization spectrumfrequency stabilization. According to the invention, the problem that the line type of a frequency discrimination curve (or a polarization spectrum) in the existing polarization spectrum frequency stabilization technology is easily influenced by output laser power fluctuation, optical element vibration and laser polarization change is solved; the intensity of two weak light beams needing to be detected in the polarization spectrum is stabilized through the feedback circuit, so that the frequency discrimination curve lines are the same during each time of frequency stabilization, and the absolute precision of frequency locking of the polarization spectrum is improved. The high-stability polarization spectrum frequency stabilizing device comprises a semiconductor laser, a shaping prism, a half-wave plate, a polarization splitting prism (polarization splitting prism), a convex lens, an acoustic optical modulator, a radio frequency signal generator, a power amplifier, a quarter-wave plate, a reflector, a single-channel photoelectric detector, an atomic vapor bubble, a light blocking block, a balance photoelectric detector and a feedback circuit.

The invention discloses an analog front end device includes a calibration unit and at least a conversion circuit. The conversion circuit includes a clamper, a multiplexer, an voltage buffer and an analog to digital converter. The clamper receives an image signal and resets the DC voltage level of the image signal to generate a clamped signal. The multiplexer receives the clamped signal and a test signal and outputs the clamped signal or the test signal according to a selecting signal. The voltage buffer amplifies the clamped signal or the test signal to generate a buffer signal. The analog to digital converter converts the buffer signal into a digital signal. The calibration unit generates a gain correction value according to the test signal and calibrates the gain offset of the digital signal according to the gain correction value.

The invention discloses an ultra-deep pipeline detection system with a calculation and analysis function. The ultra-deep pipeline detection system comprises a signal transmitter, a signal receiver, ahardware circuit and a PC terminal, wherein the signal transmitter comprises a power supply module, a man-machine interaction module, a CPU core module and a signal generation module; the signal receiver is a downward-pressing type ultra-deep pipeline detector; the hardware circuit comprises a transformer circuit, a digital power amplifier board circuit, a detection signal generation circuit of the signal transmitter, and a detection signal receiving circuit, a detection signal transmission circuit and a detection signal processing circuit of the signal receiver; and processing software of thePC terminal is underground pipeline alternating magnetic field digital signal acquisition and analysis software, and has a signal absolute value calculation and analysis function. The ultra-deep pipeline detection system is used for an ultra-deep pipeline, the detection device detects the trend and the burial depth of the target pipeline based on an electromagnetic induction principle, the absolute precision of measurement can be effectively improved, an alarm can be automatically given when the detection device is close to the pipeline, and the safety is higher; and the ultra-deep pipeline detection system provides the real-time data calculation and analysis function, so that the detection operation when the underground target pipeline condition is complex is met.

A method of using a static performance analyzer that accepts as input a cell-level netlist, to perform static performance analysis on a circuit represented by a transistor level netlist. The method begins with converting said transistor-level netlist to a cell-level netlist by modeling individual transistors with a cell model. Then, a static performance analyzer is used to perform a static performance analysis of said cell-level netlist. Among performance characteristics that may be analyzed are timing (static timing analysis) and leakage power. The method described may also be used for statistical static timing and power analysis.

The invention discloses a speed measurement system capable of improving the speed control precision of an incremental photoelectric encoder. The speed measurement system comprises the incremental photoelectric encoder, a differential speed measurement module, a speed instruction input end, a speed P control module, a current loop, a motor, an integration module and a speed I control module, wherein one path of the incremental photoelectric encoder is connected with an input end of the motor through the differential speed measurement module, the speed P control module and the current loop in sequence, and one path of the speed instruction input end is connected with the input end of the motor through the speed P control module and the current loop in sequence; and the other path of the speed instruction input end is connected with the input end of the motor through the integration module, the speed I control module and the current loop in sequence, and the other path of the incremental photoelectric encoder is connected with the input end of the motor through the speed I control module and the current loop in sequence. The speed measurement system can effectively reduce the speed feedback calculation error caused by position differentiation, so that the speed control absolute precision is improved, and the machining precision and other control performance of mechanical equipment are improved.

The present invention relates to a humidifier (10) for use in a test chamber, a test chamber, particularly a climatic chamber, etc., and a method for conditioning air in a test space of a test chamber. The humidifier comprises a container (11) having a container interior (12) for receiving a water bath (13), a heating device (15) for controlling the temperature of the water bath temperature (14),and a water bath for the water bath a ventilation system (17) for generating an air bubble (18), the container opening (28) being formed in the container above the water bath to connect the interior of the container to the test space of the test chamber, the humidifier comprising a cooling device of the temperature control system (16).