1018results about How to "Reduce 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.

The invention discloses an inspection system based on a mobile inspection apparatus of a transformer station and an inspection method thereof. The inspection system comprises a monitoring center; and the monitoring center is connected with at least one station-level mobile inspection apparatus intelligent inspection system of a transformer station through a network. And all station-level mobile inspection apparatus intelligent inspection systems include at least one base station. Meanwhile, an environmental information collection subsystem and fixed point auxiliary monitoring subsystems that are installed at places needing monitoring equipment in the transformer station are arranged in the transformer station. A detection unit comprises an infrared detection unit and an ultraviolet detection unit; and the ultraviolet detection unit is composed of an ultraviolet video server and an ultraviolet detection apparatus. According to the invention, an inspection path is optimized; the safety protection is good; and the intelligent degree is high; moreover, the inspection system has advantages of whole time fault detection and seamless video monitoring; and a novel technical detection means and omnibearing safety guarantee are provided for an intelligent transformer station.

A frequency synthesizer and an automatic calibration device are disclosed. An automatic calibration device for a phase-locked loop based frequency synthesizer includes: a frequency-to-digital converter for converting a frequency of a signal outputted from a voltage controlled oscillator into a first digital value; a frequency difference detector for calculating a difference between the first digital value outputted from the frequency-to-digital converter and a second digital value corresponding to a target frequency; an automatic frequency calibration logic for selecting an optimal control code for a capacitor bank such that an output frequency of the voltage controlled oscillator is closer to the target frequency; and a loop bandwidth calibration logic for tuning a charge pump gain such that a loop bandwidth is kept constant in the optimal control code using the frequency-to-digital converter. Thus, the calibration speed can be increased, and the loop bandwidth can be kept constant within the output frequency range.

The present invention relates to a method for antenna calibration in a communication system having a bandwidth divided into multiple frequency intervals M with multiple communication units 40; 50, each comprising communication circuitry 21, 24: 31, 34; 41, 42; 51, 52, 54 connected to an antenna arrangement 22, 25; 32, 35; 44, 45; 55, 49, communicating with each other over multiple communication channels. The method comprises: establishing a calibration sequence to perform antenna calibration for at least one of said multiple frequency intervals; converting the calibration sequence from the frequency domain to the time domain; transmitting a part of said calibration sequence in the time domain from a first communication circuitry 21; 34; 41; 51, 54 to a second communication circuitry 24; 31; 42; 52, 54 over the multiple communication channels; receiving the part of said calibration sequence in the second communication circuitry 24; 31; 42; 52, 54 for each communication channel; performing antenna calibration based on the received part of the calibration sequence.

According to the embodiment, the invention discloses a display correction method, a display correction device and a display correction system of a display panel. The method comprises the following steps: acquiring monochromatic display brightness, under various gray scales, of various color sub-pixels when a reference display panel displays in monochrome, and acquiring monochromatic theoretical brightness when the reference display panel displays in white; acquiring a corresponding relation between input voltage and display brightness when a to-be-detected display panel displays in monochromatic; calculating target theoretical brightness of the various color sub-pixels in accordance with white target brightness and white target chroma when the to-be-detected display panel displays in white under a preset gray scale; searching a target gray scale corresponding to monochromatic theoretical brightness which is equal to target theoretical brightness, and searching monochromatic display brightness corresponding to the target gray scale; determining corresponding input voltages of various color sub-pixels of the to-be-detected display panel when the monochromatic display brightness is displayed; and determining target input voltage of the to-be-detected display panel in accordance with a chroma difference value and a brightness difference value. According to the embodiment, display correction method provided by the invention is short in consumed time and suitable for large-scale debugging.

An apparatus and method for calibrating transmission paths in a multicarrier communication system using multiple antennas are provided. In the transmission path calibrating apparatus, a calibration processor generates reference signals to estimate distortions in phase and amplitude in transmission paths, allocates the generated reference signals to subcarriers which are different in each of the transmission paths, and calculates calibration vectors for the transmission paths using the generated reference signals and received reference signals received through the transmission paths. A baseband module IFFT-processes the generated reference signals allocated to the subcarriers and sends the IFFT signals in the transmission paths.

The invention discloses a double-shaft continuous rotation-based hybrid type platform inertial navigation system calibration method. The method comprises the following steps: (1) performing coarse alignment to obtain a coarse initial attitude matrix; (2) controlling an outer ring shaft and a platform body shaft of a platform system to rotate at the same angular speed, enabling an inner ring shaftto be under a locked state, and acquiring gyroscope and accelerometer output in the rotating process; (3) resolving an error state equation and an observation equation and calibrating gyroscope scalefactor error, gyroscope mounting error and accelerometer equivalent zero offset; (4) controlling an outer ring frame angle, an inner ring frame angle and a platform body frame angle to lock in a zerostate, rotating the platform body shaft by 180 degrees and locking, and acquiring output data of the gyroscope; (5) controlling the outer ring frame angle, the inner ring frame angle and the platformbody frame angle to lock in the zero state, rotating the outer ring shaft by 180 degrees and locking, and acquiring output data of the gyroscope; and (6) calculating the constant drift of the gyroscope. By the method, the calibration time is effectively shortened and the calibration efficiency is improved.

The invention provides a transformation calibration method and system for a mechanical arm coordinate system. The transformation calibration method comprises the steps that S1, based on a tracking measurement device arranged in the working range of a target mechanical arm, the coordinate rotation transformation relation of a tail end tool coordinate system relative to a measurement reference coordinate system is obtained through a tail end coordinate system translational movement method; S2, the coordinate homogeneous transformation relation of the tail end tool coordinate system relative to amechanical arm base coordinate system is obtained through a single-axial rotation method based on the tail end tool coordinate system and kinematic transformation relative to the mechanical arm basecoordinate system; and S3, based on coordinates of selected calibration sampling points, the coordinate homogeneous transformation relation of the mechanical arm base coordinate system and the measurement reference coordinate system is obtained through a multipoint gravity center solution method, a gravity center processing method and a Roderick matrix transformation solution method. The calibration procedure is simple, the calibration algorithm is free of the iterative process, the consumed time of coordinate calibration can be effectively reduced, and the calibration precision of the coordinate systems is improved.

The invention discloses a microphone calibrator and a calibration method thereof. The microphone calibrator comprises a muffler, a mounting section for a microphone to be calibrated, a mounting section for a standard microphone and a sound source which are sequentially connected from front to back, wherein the mounting section for a microphone to be calibrated is provided with a mounting hole fora microphone to be calibrated, and the mounting hole is used for mounting the microphone to be calibrated; and the mounting section for a standard microphone is provided with a mounting hole for a standard microphone, and the mounting hole is used for mounting the standard microphone. The calibration method comprises the following steps: mounting two standard microphones in two mounting holes of the different standard microphones in accordance with different frequencies, measuring a complex reflection coefficient r of the muffler, and then obtaining a complex sensitivity curve of the microphone to be calibrated; and enabling the sound source to respectively send out sound waves of different frequencies, obtaining the complex sensitivity curve of the microphone to be calibrated, and thus achieving the purpose of calibrating the microphone to be calibrated. The invention can realize simultaneous calibration of a large number of microphones, thereby saving the calibration time. Besides, the invention can carry out phase calibration for a large number of microphones.

An automatic frequency calibration apparatus and a method thereof for a phase-locked loop based frequency synthesizer are disclosed. The apparatus includes a frequency-to-digital converter configured to convert a frequency of a VCO output signal to a first digital value, a target value setting section configured to provide a second digital value corresponding to a target frequency, and a finite state machine configured to calibrate the frequency of the VCO output signal by using the difference of the first digital value and the second digital value. Accordingly, the calibration speed and a frequency resolution of the automatic frequency calibration apparatus in a frequency synthesizer may be enhanced.

The invention provides a hand-eye calibration method for a laser line structured light sensor. The hand-eye calibration method includes the steps that a sensor coordinate system is established on the sensor, a structured light stripe is generated from a structured light plane projected by a mid-laser device of the sensor to a target, the pose of a robot is adjusted, the stripe and a straight line on a calibration template are intersectant to form feature points, and a pose parameter of the robot and output data of the sensor of this moment are recorded; outputting of the sensor is combined with geometrical parameters of the sensor, and three-dimensional coordinates, under the sensor coordinate system, of all the points on the laser stripe can be obtained; the feature points generated when the stripe and the straight line on the calibration template are intersectant are extracted. The process is repeated, N sets of different robot pose parameters and the feature points corresponding to all the parameters are obtained, the calibration problem is converted into the least square problem through N sets of data collected under a constraint of space straight lines, and the problem is solved through the optimization algorithm. The hand-eye calibration method is simple and convenient and easy to conduct, the position and the pose are accurately controlled, the efficiency is high, the quality is good, and the hand-eye calibration method has the high practical value.

The invention provides a frequency correction method and system of a phase-locked loop. The frequency correction method and system of the phase-locked loop are applied to selection of sub-bands of multi-band voltage-controlled oscillators. The method includes the steps that in the counting time TCNT [k], frequency counting is conducted on frequency signals output by a voltage-controlled oscillator at the current working sub-band, and a frequency count value FCNT[k] is obtained, wherein the current working sub-band corresponds to a binary value of a current node in a binary search tree; the error between the FCNT [k] and a target frequency count value FCNTTARGET [k] is calculated, the absolute value of the error is compared with a predetermined value, the TCNT [k] is adjusted dynamically in value range of the TCNT [k] according to a comparison result, and a target working sub-band of the voltage-controlled oscillator is determined by combining the binary search algorithm. According to the method, the measurement error is compared with the predetermined value, and therefore whether a counting time reference is increased or not is controlled; a correct choice is made between correction time and correction accuracy, and therefore the correction time is effectively controlled; the dynamic correction method can effectively shorten the correction time on the whole.

An electric charged particle beam microscope is provided in which a specimen movement due to a specimen rotation is classified into a repeatable movement and a non-repeatable movement, a model of movement is determined for the repeatable movement, a range of movement is determined for the non-repeatable movement, the repeatable movement is corrected on the basis of the movement model through open-loop and the non-repeatable movement is corrected under a condition set on the basis of the range of movement.

A system and method for a neural interface system with integral calibration elements may include a sensor including a plurality of electrodes to detect multicellular signals, an interface to process the signals from the sensor into a suitable control signal for a controllable device, such as a computer or prosthetic limb, and an integrated calibration routine to efficiently create calibration output parameters used to generate the control signal. A graphical user interface may be used to make various portions of the calibration and signal processing configuration more efficient and effective.

A calibration pattern is provided with a central portion and a frame pattern provided outside thereof, the central portion being provided with a rectangular light area in the central portion of the calibration pattern. The frame pattern has a horizontal pattern and a vertical pattern, the horizontal pattern extending to two horizontal sides centering the central portion and alternately provided with a light area and a dark area at a predetermined interval different from an equal interval, the vertical pattern extending to two vertical sides centering the central portion and alternately provided with a light area and a dark area at a predetermined interval different from an equal interval. The horizontal pattern and the vertical pattern include edges, each being positioned equally distant from a predetermined position in the central portion to the two sides, and the edges have an identical change direction of a gray value.

The invention discloses a method for achieving optical surgical navigation surgical instrument calibration through a calibrating device. The method comprises the steps of 1) establishing a calibrating device coordinate system; 2) calculating a transfer matrix from a surgical navigation coordinate system to the calibrating device coordinate system; 3) establishing a surgical instrument coordinate system and calculating a transfer matrix between the surgical instrument coordinate system and the surgical navigation coordinate system; 4) calculating a transfer matrix from the calibrating device coordinate system to the surgical instrument coordinate system; 5) calculating the coordinates and orientation of a tip of a surgical instrument in the surgical instrument coordinate system. The method reduces operating complexity, reduces calibrating time, is suitable for field calibration and has higher clinical application value.

The invention discloses a car networking based panoramic all-round system calibration method, device and system and belongs to the technical field of car electronics. The method includes that a car networking terminal sends an image acquisition instruction to enable a main controller to acquire distorted images acquired by multiple cameras configured to a to-be-calibrated car on a calibration station; the car networking terminal transmits the collected distorted images to a car networking platform through a network, the car networking platform calibrates the car after the car leaves the current station, calibration parameters are acquired, and further the main controller processes the distorted image according to the calibration parameters to obtain a panoramic image surrounding the car; the car networking terminal prompts a driver to leave for a next station. Based on car networking, calibration is performed on the background by only image acquisition and transmission on the calibration station. Calibration time of the calibration station is saved, and production efficiency of a car plant is improved; image transmission equipment and calibration personnel needed for field calibration are reduced, and cost is lowered.

The invention relates to a method for calibrating zero offset of a quartz flexible accelerometer component, which is a system grade calibrating method using a velocity error as observed quantity. In the method, the conventional calibration equipment is still used, the six-position calibration scheme has simple operation and high calibration accuracy; and compared with conventional multi-position division calibration test, the calibrating time of the method of the invention is greatly shortened, calibration errors caused by rotary table errors when multiple positions are calibrated are reduced, and the navigation performance of a strapdown inertial navigation system can be improved. The invention provides a practical system grade calibration method for the accelerometer component.