125results about How to "Short calibration time" patented technology

A phased array antenna system includes an RF front end, a radome, and an optical calibrator embedded in the radome for enabling in-situ calibration of the RF front end. The optical calibrator employs an optical timing signal generator (OTSG), a Variable Optical Amplitude and Delay Generator array (VOADGA) for receiving the modulated optical output signal and generating a plurality of VOADGA timing signals, and an optical timing signal distributor (OTSD). The in-situ optical calibrator allows for reduced calibration time and makes it feasible to perform calibration whenever necessary.

A driving integrated circuit (IC) is provided. The driving IC includes a reference voltage setup circuit configured to output a reference voltage based on a test voltage and a load current control unit comparing a load voltage output from a load resistor with the reference voltage in response to a load current and maintaining the load current constant based on a result of the comparison.

The invention relates to an error calibration method of an MEMS (micro-electromechanical system) three-axis gyroscope, which belongs to the technical field of tests. The method comprises the steps of establishing an error correction model of the MEMS three-axis gyroscope, calibrating the MEMS gyroscope by a bi-axis speed turntable, collecting the output of a three-axis sensor of the MEMS gyroscope under different gestures in one constant-speed field, and obtaining a constant error, a calibration factor error and a non-orthogonal error of the MEMS gyroscope by a least-square ellipsoid fitting algorithm. The method is simple to operate and short in calibration time, has low requirements on a calibration device, and is suitable for rapidly calibrating the low-cost MEMS gyroscope.

The invention discloses an 8-position strapdown inertial navigation system level calibration method based on speed observation. The method mainly includes installing an inertial unit on a dual-shaft rotary table with an incubator, setting the temperature of the incubator of the rotary table, supplying power to the strapdown inertial navigation system, after the temperature is stable, initializinga navigation system and a Kalman filter, orderly rotating the inertial unit by 8 positions through the rotary table, fully exciting errors of the inertial unit, inputting the speed error, computed bynavigation, as observed quantity into the Kalman filter, estimating 24 error parameters of the inertial unit, respectively setting N different temperature points of the incubator, repeating the 8-position calibration processes, and fitting error parameters of the multiple temperature points. The method has the advantages of fast calibration rate and independence of the rotary table precision, canrealize temperature compensation for the inertial unit and is free of a complex temperature compensation test.

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 provides a vehicle-mounted camera automatic calibration method based on lane line vanishing points. The method comprises the steps that an image photographed by a camera when the vehicle is in the middle of the lane is acquired, wherein the image includes clear left and right lane lines; the image is processed, a left and right lane line equation is acquired, and the coordinates of the intersection point P0 of the left and right lane lines and the intersection points P1 and P2 of the left and right lane lines and the lower side line of the image in an image coordinate system are calculated; a world coordinate system is established, and the coordinates of the real space points P0', P1' and P2' corresponding to the points P0, P1 and P2 in the image in the world coordinate system are acquired; and a calibration matrix is obtained according to the coordinates of the points P0, P1 and P2 in the image in the image coordinate system and the coordinates of the corresponding real space points P0', P1' and P2' in the world coordinate system. According to the method, the vehicle only requires to be driven in the middle of the lane or parked in the middle of the lane and then the photographed image can be automatically processed, and the calibration matrix can be obtained by inquiring the width of the current lane so that the calibration accuracy is high, operation is easy and convenient without artificial intervention and real-time calibration can be performed.

A phased array antenna system includes an RF front end, a radome, and an optical calibrator embedded in the radome for enabling in-situ calibration of the RF front end. The optical calibrator employs an optical timing signal generator (OTSG), a Variable Optical Amplitude and Delay Generator array (VOADGA) for receiving the modulated optical output signal and generating a plurality of VOADGA timing signals, and an optical timing signal distributor (OTSD). The in-situ optical calibrator allows for reduced calibration time and makes it feasible to perform calibration whenever necessary.

A testing method transponder channel frequency response based on a vector network comprises the steps of (1), selecting a PNA-X-series vector network analyzer and a switching matrix with a vector network analyzer testing channel as testing equipment; (2), performing frequency scanning self-calibration on the vector network analyzer; (3), respectively calibrating an uplink testing channel and a downlink testing channel of the system by means of the vector network analyzer; (4), connecting the vector network analyzer with the switching matrix and a to-be-tested transponder, and constructing a testing channel; (5), setting related parameters in the vector network analyzer, finishing amplitude frequency characteristic measurement, outband inhibition measurement and group delay measurement through automatic controlling of the vector network analyzer, and simultaneously drawing a corresponding signal trace line; and (7), extracting testing result data of three testing items, and respectively deducing insertion loss and time delay of the testing channel, thereby obtaining a final channel frequency response testing result of the tested transponder.

The invention provides an internal calibration circuit of a microwave power probe. The internal calibration circuit of the microwave power probe includes a microwave power sensor, a multi-core cable and a host power measurement channel; after microwave signals are inputted, a diode detector pair enabling +detection and -detection performs detection, so that +detection voltage and -detection voltage which are opposite to each other and have the same amplitude are outputted; a precise input operational amplifier performs 1:1 reverse amplification on output voltage of a D / A converter; various kinds of compensation data of the probe are stored in an EEPROM; an interface extender controls port output states through an IIC bus and is used for controlling the switching selection of high-speed switches and operating control signals of the D / A converter; and a linear differential amplifier enhances the transmission capability of the signals and transmits the signals to a power meter host through a cable. Compared with a method in which a calibration source plate is arranged inside a host, with the circuit and method of the invention adopted, 2000 yuan to 3000 yuan is expected to be saved, and calibration time is short, and calibration can be completed in one minute.

The present invention provides novel methods for the calibration and fast tuning of VCOs in PLLs. Information for coarse tuning before normal operation are calculated and stored. Therefore, these methods decrease significantly the time needed for a PLL to transition from one frequency to another. These methods include the steps of: determining a digital code Dc to coarse tune to a calibration frequency, Fc; dividing the operating frequency band of the PLL into a plurality of sub-bands; determining and storing the information needed to generate the offsets for each sub-band. In tuning to a desired frequency, the following steps are taken: determining the sub-band corresponding to the desired frequency, F, generating the offset for that sub-band, calculating the digital code for coarse tuning the VCO to the desired sub-band, coarse tuning to a frequency within the desired sub-band, and fine tuning to the desired frequency, F.

According to one embodiment, a testing device includes a signal generator that generates a first signal output to a device under test, a channel selector provided after the signal generator and configured to select one of a plurality of channels, a signal receiver that receives the second signal supplied from the device under test, a correction value calculator that calculates a correction value for calibrating loss of a respective one of the channels, wherein the correction value calculator calculates a correction value for calibrating loss of a respective one of the channels included in the channel selector, based on a signal level received by the signal receiver via a loopback channel, when a calibration-level output state indicating a state where a signal level of the first signal generated by the signal generator reaches a predetermined transmission reference level of calibration is assumed.

The invention discloses a gas supply system of a semiconductor processing device and a method for calibrating gas flow, the gas supply system comprises a gas path box for supplying gas to a reaction chamber, an mass flow controller (MFC) and a pipeline for cleaning the gas path box are provided on the gas path box, a calibrating isolation valve is provided on the pipeline for cleaning the gas path box and can insulate and close the pipeline for cleaning the gas path box, gas with a certain flow is supplied into the pipeline for cleaning the gas path box by the MFC, then actual flow of the gasentered into the pipeline for cleaning the gas path box can be calculated according to an ideal gas state equation, comparing with the actual flow of the gas and a setting flow of the MFC, the gas flow of the gas supply system can be calibrated based on the compared result. The costs of the system and the method are low, the calibrating times of the system and the method are short.

The invention discloses a single-axis rotary strapdown inertial navigation system calibration method based on an optimization method; the calibration method comprises the following steps that firstly,a single-axis rotary strapdown inertial navigation system is installed on a double-axis rotary table by utilizing a tool, a system is powered on, a transposition mechanism is reset and closed, and after the temperature of the system is stable, the rotary table is used for enabling the system to sequentially turn to 18 positions; then the double-shaft rotary table is used to be matched with the transposition mechanism to carry out 9-group rate experiments, optimizing and estimating are carried out on the data by utilizing a nonlinear optimization method to obtain 18 error parameters; and finally, the system is installed on a three-axis rotary table, three position experiments and three groups of rate experiments are carried out, and an orthogonal coordinate system of an accelerometer and agyroscope is calibrated to a three-axis rotary table coordinate system. The calibration method disclosed by the invention has the advantages of automation calibration and no dependence on the precision of the rotary table, and can realize calibration of the system before delivery and re-calibration of the system after delivery for a long time.

The invention discloses an automatic white balance online regulation system and method for a flat-panel display product, and relates to the technical field of picture quality of flat-panel display products. The automatic white balance online regulation system for the flat-panel display product comprises a color temperature acquisition analyzer, an upper computer and the flat-panel display product. The regulation method comprises the steps that the color temperature acquisition analyzer acquires the current color temperature of the flat-panel display product, performs conversion to obtain x and y color coordinate values, and transmits the x and y color coordinate values to the upper computer; the upper computer analyzes the x and y color coordinate values transmitted by the color temperature acquisition analyzer, continuously regulates a related register value of the flat-panel display product, and transmits a storage instruction when the x and y color coordinate values are measured to be within a target value range; the flat-panel display product parses the storage instruction transmitted by the upper computer, automatically reads the related register value, converts the related register value into a white balance parameter, and stores the white balance parameter into a data storage area. The system and the method have the advantages of short calibration time, production cost saving, simple software implementation, high transplantability and the like.

The invention discloses a method for calibrating the spectral wavelength of an optical grating rotary light splitting spectrograph. The method is characterized in that a relation between the optical wavelength and reading of an optical encoder is derived by using an optical grating equation working under a Littrow condition, and a theoretical calibration model is established; spectral wavelength calibration is carried out by using a two-point equation solving method; and finally, initial wavelength positioning is carried out by using calibration parameters in order to ensure the consistency in target position when different spectrographs measure gratings with the same wavelength. The method disclosed by the invention has the advantages that (1) the calibration steps are simple and effective, and the calibration workload and the calculation amount are reduced under the premise of ensuring the calibration precision; (2) the calibration work can be completed by only using two standard light sources with different wavelengths under the premise of ensuring the accuracy of the wavelength, the calibration time is short, the calibration efficiency is high, and the calibration cost is low; and (3) the calibration model is established through known theories, curve fitting is not required to be adopted, factors, which influence calibration, among different spectrographs are considered comprehensively, calibration is carried out more reasonably and more feasibly, and the calibration precision is higher.

The invention discloses a calibration method of a steering angle sensor. The calibration method comprises the following steps that the steering angle sensor is roughly calibrated when a vehicle is ina static state; a GNSS antenna is fine calibrated when the vehicle drives; and the steering angle sensor is fine calibrated by using GNSS antenna data after fine calibration when the vehicle drives. The invention further discloses a calibration device of the steering angle sensor. The calibration device comprises a steering angle sensor rough calibration unit, a GNSS antenna calibration unit and asteering angle sensor fine calibration unit; and the steering angle sensor rough calibration unit is used for rough calibration of the steering angle sensor, the GNSS antenna calibration unit is usedfor fine calibration of the GNSS antenna, and the steering angle sensor fine calibration unit is used for fine calibration of the steering angle sensor by using the GNSS antenna data. The calibrationmethod and device of the steering angle sensor does not require a driver to strictly drive in a straight line, and the operation process is relatively simple and time is saved, and the obtained installation error of the steering angle sensor is more accurate.

The invention discloses a north-seeking full-temperature calibration compensation method for a flexible gyro inclinometer. The method includes the steps that the flexible gyro inclinometer provided with a temperate control tool is installed on a three-axis calibration device; in the process that temperature is raised or reduced to preset temperature, at least one turn of 52 rotation positions of the three-axis calibration device is finished, the flexible gyro inclinometer conducts north-seeking once and outputs a group of corresponding north-seeking data after each position is rotated; a voltage signal output by the X axis of an accelerometer, a voltage signal output by the Y axis of the accelerometer, a voltage signal output by the Z axis of the accelerometer and temperature of a gyroscope in at least 52 groups of north-seeking data are substituted into an accelerometer error compensation module, and accelerometer error coefficients of the X axis, the Y axis and the Z axis are obtained through the least square method; a voltage signal output by the X axis of the gyroscope, a voltage signal output by the Y axis of the gyroscope, temperature of the gyroscope and a specific force signal without errors on the X axis, the Y axis and the Z axis of the accelerometer in at least 52 groups of north-seeking data are substituted into a gyroscope error compensation module, and error coefficients of the X axis and the Y axis of the gyroscope are obtained through the least square method.

The invention discloses a field calibration method for a radiated emission measurement antenna of an electromagnetic compatibility experiment. The field calibration method comprises the following steps that an antenna factor of a reference antenna is obtained through measurement; a first standard value of power of an electromagnetic wave signal is obtained through measurement; a first measurement value of the power of the electromagnetic wave signal is obtained through measurement; the difference value between the first standard value and the first measurement value is calculated to obtain insertion loss between the reference antenna and a transmission antenna; a second standard value of the power of the electromagnetic wave signal is obtained through measurement; a second measurement value of the power of the electromagnetic wave signal is obtained through measurement; the difference value between the second standard value and the second measurement value is calculated to obtain insertion loss between an antenna to be calibrated and the transmission antenna; the antenna factor of the antenna to be calibrated is obtained through calculation of the antenna factor of the reference antenna, the insertion loss between the reference antenna and the transmission antenna and the insertion loss between the antenna to be calibrated and the transmission antenna. The field calibration method is applied to calibration of the radiated emission measurement antenna in a 30MHz-1GHz frequency band.

The invention discloses an all-digital beam forming array and a method for realizing automatic calibration of amplitude and phase of a transceiving channel, a transmission line is embedded in the aperture surface of an antenna array, and calibration transceiving channels are connected to two ends of the transmission line; during emission calibration, each emission channel is excited in sequence, signal amplitudes and phase values sampled by the two calibration receiving channels are recorded at the same time, and amplitudes and phase differences of all the emission channels relative to the reference channel are calculated; during receiving calibration, all receiving channels of the system are in a working state, calibration transmitting channels on the two sides are successively excited, calibration signal amplitudes and phase values obtained by sampling of all the receiving channels are recorded, and amplitudes and phase differences of all the receiving channels relative to a reference channel can be deduced. According to the automatic calibration method for the receiving and transmitting channels of the all-digital beam forming array, limitation of sites and manpower is avoided,introduction of a large number of directional couplers is reduced on hardware, and the automatic calibration method is suitable for self-calibration of the large-scale all-digital beam forming array.

The invention discloses a method and a system for quickly calibrating field uniformity of transient electromagnetic field. The method includes the steps of selecting apexes of a rectangular calibrating plane as measuring points; placing a rotary shaft (2) at the center of the calibrating plane, adjusting a positioning device (4) to limit a test bar (3) in the calibrating plane, and selecting length of the test bar (3) to enable a probe (6) to reach the apexes of the calibrating planes; rotating the test bar (3) in the calibrating plane to enable the probe (6) to locate at the apexes of the calibrating plane respectively, and using the probe (6) to measure values of field intensity of the apexes of the calibrating plane. The method and the system require no frequent movement of a support for supporting and fixing the probe, and after the support is fixed, repeated adjustment of the specific position and angle of the probe on the support is not needed. The method and the system are simple in calibrating process, fast in calibration and short in calibrating time.

The invention discloses a zero-position calibration system and method for a permanent magnet synchronous motor. The system comprises a high-voltage DC power supply, a motor controller, a relay and a permanent magnet synchronous motor which are connected in sequence, wherein a control board of the motor controller is also designed with a three-phase back electromotive force sampling circuit, a voltage comparison circuit, a rotation value latching mode selection circuit and a relay control circuit respectively; and the motor controller is also connected with an upper computer through a CAN line.According to the scheme, a control board circuit and a control program of the motor controller are added and modified, thereby realizing one-key calibration of the rotational zero position of the motor without additional circuit and dynamometer dragging, and omitting a complicated bench mounting process. The zero-position calibration system and method are easy to operate, and short in calibrationtime. According to the scheme, a rotational zero position is calculated by means of forward and reverse rotation and filter averaging under the same accelerating torque and limited rotational speed,so that the algorithm is more reasonable and more accurate, and the problem of circuit delay does not need to be considered.

The present invention discloses a two-step VCO calibration method. The two-step VCO calibration method, comprising power-on calibration, used to provide a coarse VCO tuning; real-time calibration, used to provide a fine VCO tuning according to the loaded result of said power-on calibration. The two-step VCO calibration method according to the present invention can cover all the variation of process and temperature and gain the advantages of shorter calibration time, smaller gain of VCO, pretty smaller size of passive loop filter and less operating power consumption.

The invention provides a parallel amplitude-phase calibration method and a parallel amplitude-phase calibration system for a phased-array antenna. The method comprises a calibration signal setting step: setting a single-frequency calibration signal to be incident on the phased-array antenna, or to be transmitted through the phased-array antenna; an initial state setting step: selecting a pluralityof antenna units on the phased-array antenna, and setting the phase shifter of each selected antenna unit to be in an initial state; a modulation step: carrying out periodic phase modulation on the phase shifter of each selected antenna unit; and an analysis step: analyzing the harmonic characteristics of the received single-frequency calibration signal to calibrate the amplitude and phase of thecorresponding antenna unit. According to the invention, a plurality of units of the phased-array antenna can be simultaneously calibrated (the number of units calibrated at the same time is not limited), and the amplitude and the phase of each unit channel are calculated by carrying out harmonic characteristic analysis on the received calibration signal.

The invention discloses an online dynamic calibrating method for errors of inner and outer lever arms of two rotary inertial navigation systems. The method comprises the steps: firstly, establishing measuring models for respective inner lever arms, a measuring model for intersystem outer lever arm errors and a measuring model for intersystem speed difference of the two rotary inertial navigation systems; secondly, realizing a principle and way of separation of the respective inner lever arms of the two rotary inertial navigation systems on the basis of model analysis, and designing a rotationpolicy of the two rotary inertial navigation systems; then, separately controlling frameworks of RINS1 and RINS2 to rotate according to the preset rotation policy, carrying out navigation resolving, and outputting speed information on the two rotary inertial navigation systems; finally, calculating speed difference between the two rotary inertial navigation systems, constructing a Kalman filter bytaking the speed difference as a measurement amount, so as to achieve the online dynamic calibration on the errors of the inner and outer lever arms of the two rotary inertial navigation systems. According to the method, the required calibration time is short, the calibration process is simple, the accuracy in calibration of the inner and outer lever arms is high, the dependence on other outsidereference information is not required, the independence is high, and the implementation is facilitated.

The invention relates to the technical field of computer vision, in particular to an optical motion capture-based multi-camera calibration method in a large-space environment and related equipment. The method comprises the following steps: collecting multi-frame data captured by each optical camera for a calibration rod, classifying the multi-frame data according to frames, and obtaining a plurality of corresponding initial data for each frame; removing and detecting the coordinate data of each frame to obtain a plurality of corresponding effective data of each frame; initializing each opticalcamera according to the plurality of effective data to obtain a target internal reference of each optical camera; and determining the camera serial number containing the most effective data as a maincamera, and obtaining target external parameters of all optical cameras according to internal and external parameters of the main camera. According to the method, high-precision camera internal and external parameters are finally obtained, sufficient and necessary conditions are provided for subsequent operation of converting two-dimensional space coordinates into three-dimensional space coordinates, and a foundation is laid for high-precision positioning and tracking in the whole optical motion capture system.

The invention relates to a calibration device and a calibration method of a laser gas analysis system and the laser gas is obtained by coupling the light which is emitted by a laser by an optical fibre, wherein, the calibration device is composed of a laser (8), an optical switch (9), a standard air chamber (10) and a launch interface (11); the optical switch (9) is arranged in a main engine unit (1) of the online laser gas analysis system and is connected with the laser (8) in the main engine unit (1); the optical switch (9) is further connected with the standard air chamber (10) and the launch interface (11); standard to-be-detected gas is sealed in the standard air chamber (10); the launch interface (11) is connected with a launch unit (2) of the online laser gas analysis system. The calibration time is short by adopting the calibration method of the device, and multiple repeated calibrations can be accomplished in a minute; the calibration is programmed with no need of human intervention, and the system state can be monitored at any time; the calibration device has simple structure, and only the light path is improved without changing the structure of field installation, therefore, the current system is easy to be upgraded.

The invention relates to a calibration device and a calibration method used for an indoor pyranometer. A supporting pillar and a positioning pillar are arranged on left and right surfaces of a rotating crossbeam respectively, and a rotating shaft is fixed in a bearing in a shaft core and is movably connected with a fixed shaft; a light shield is fixed at the bottom end of a light shield disc, theupper end surface of the light shield disc is fixed with a crossbeam of a photochopper, the crossbeam of the photochopper is placed in a U-shaped mouth on an upright shaft of the photochopper and is connected with the upright shaft of the photochopper through a pin shaft; and the upright shaft of the photochopper is fixed on a worktable board, a turn table is fixed on the worktable board, the crossbeam of the photochopper is rotated clockwise to enable the light shield of the photochopper to be placed above the turn table, a light source support is fixed on the rear end surface of the worktable, an irradiation light is movably connected on the light source support, and the distance between the irradiation light and the worktable board can be adjusted. The method is characterized in that the calibration can be performed indoor at any time, and is not limited or influenced by weather; the light source is stable, the calibration time is short, and the stability is high; and the use is convenient, the efficiency is higher, and the data reliability is high.

The invention discloses a static calibration method of an ultra-short base line acoustic positioning system. The method comprises: a ship body coordinate system is established and is marked as a CRP coordinate system; a coordinate system established by a transducer is marked as a Tcvr coordinate system; a plurality of transponders are hung into the water from the ship board of the ship body, a coordinate of each transponder in the CRP coordinate system is recorded and is marked as A with a CRP transverse distance and a CRP longitudinal distance, and a coordinate of each transponder in the Tcvr coordinate system is recorded and is marked as B with a Tcvr transverse distance and a Tcvr longitudinal distance; according to a formula, calculation is carried out to obtain an angle offset of each transponder between the CRP coordinate system and the Tcvr coordinate system and the angle offset is marked as Heading, wherein the formula is: Heading = arctan (Tcvr transverse distance / Tcvr longitudinal distance)- arctan (CRP transverse distance / CRP longitudinal distance); and an average value of the angle offsets of the multiple transponders between the CRP coordinate system and the Tcvr coordinate system is obtained. According to the method, the application range of the ultra-short base line for different working ships can be enlarged; and a problem that the working ship without the navigation capability or with poor navigation capability can not complete conventional dynamic calibration can be solved.