62results about How to "Realize dynamic calibration" patented technology

The invention, which belongs to the combined navigation technology field, discloses an accelerometer calibration method based on GPS velocity information. The method comprises the following steps: step 1, collecting measurement data of a GPS measurement system and a DR measurement system; step 2, determining usability of the GPS measurement data; step three, employing a least square method to estimate a scale factor and a zero offset error of an accelerometer; step four, comparing estimation values of the scale factor and the zero offset error of the accelerometer with estimation values of a preset accelerometer scale factor and a preset accelerometer zero offset error to determine whether updating is carried out; and step five, meeting a time interval requirement and then returning to the step two to carry out next calibration. According to the invention, a GPS characteristic that the GPS enables a measurement value precision to be high at a linear motion segment with good signal reception and high speed is utilized to realize dynamic calibration on an accelerometer, so that calibration parameter of the accelerometer can be updated regularly and an influence on the system precision by a zero offset change caused by different starting and temperature changes can be reduced. Moreover, the realization is simple, the calculation amount is small, and the result is reliable.

The invention provides a multi-dimensional force sensor calibration device with controllable poses. The multi-dimensional force sensor calibration device comprises a fixing platform, drive mechanisms, connecting rod mechanisms and a moving platform. The upper ends of the drive mechanisms and the lower ends of the connecting rod mechanisms are connected to form drive connecting rod mechanisms. The upper ends of the six drive connecting rod mechanisms are hinged to the moving platform through universal hinges, and the lower ends of the six drive connecting rod mechanisms are hinged to a fixed platform to form a six-freedom-degree parallel mechanism. The six drive connecting rod mechanisms are divided into three groups. Every two adjacent drive connecting rod mechanisms form one group and are arranged in the mode shaped like a Chinese character 'ba'. The poses of a calibration platform can be controlled and changed, and the calibration device has the function of calibrating a sensor dynamically and statically, and is complete in function, convenient to operate, high in calibration precision and capable of being well applied to practical engineering.

The invention discloses a multiple star image and attitude associated star sensor internal parameter calibration method and a device thereof. A GPS antenna 3, a gyroscope unit 1 and a to-be-calibrated star sensor 2 communicate with a GPS receiver 4 respectively, and a data processing computer 5 is connected with the gyroscope unit 1 and the to-be-calibrated star sensor 2 respectively; synchronous data acquisition of the gyroscope unit 1 and the star sensor 2 is realized by virtue of UTC (universal time coordinated) time information acquired by the GPS receiver 5, and calibration algorithm solution of the to-be-calibrated star sensor 2 is completed in the data processing computer 5. According to the method, the gyroscope unit is used for providing accurate rotating angle information to implement splicing association of a plurality of frames of star images, thereby increasing observed data samples for internal parameter calibration of the star sensor; the method can be used for calibration under a dynamic condition, no strict requirements are made to the motion state of the to-be-calibrated star sensor 2, the calibration accuracy and reliability are improved, a calibration flow is simplified, dynamic calibration of the to-be-calibrated star sensor 2 can be conveniently implemented, and the method and the device are also applied to calibration of an inertial/celestial combined navigation system.

The invention provides a calibration method for a cathode filament emission characteristic curve of an X-ray generator, and belongs to the technical field of X-ray generators. The calibration method comprises: in a practical operation process of an X-ray generator, setting filament current based on a first cathode filament emission characteristic curve, and generating X-rays through operation of the X-ray generator, and acquiring actual bulb current corresponding to the filament current, and using the filament current and the actual bulb current to dynamically calibrate the first cathode filament emission characteristic curve, to update to a second cathode filament emission characteristic curve. The calibration method can make the cathode filament emission characteristic curve dynamically calibrated, and the cathode filament emission characteristic curve is more accurate, and the setting of the bulb current is more accurate.

The invention provides a shock wave pressure test installation structure for shock tube calibration, and belongs to the technical field of dynamic calibration. The shock wave pressure test installation structure is a pressure sensor installation structure of shock wave ground reflection pressure measurement in a damage condition. The structure can be installed at a tail end of a shock tube and performs dynamic calibration. The structure comprises a mounting base, a component, buffer spacers, a clamping element and a pressure sensor. The pressure sensor is installed on the component, the buffer spacers sleeve two ends of the component, the component is placed in the mounting base then, and the component is fixed to the mounting base through the clamping element. After installation is completed, an end face of the pressure sensor, an end face of the component and an end face of the mounting based are flush with each other. The dynamic calibration of a shock wave ground reflection pressure measurement system in an actual damage condition can be achieved, and actual dynamic characteristics of the shock wave ground reflection pressure measurement system are obtained.

The invention discloses a calibration platform and a calibration method for a six-dimensional acceleration sensor, and belongs to the field of multidimensional acceleration sensors or strap-down inertial navigation. Two horizontal turntables with cylindrical pins drive two sliding platforms with sliding chutes to reciprocally move along own guide rails respectively. Two gears are arranged on one sliding platform, and the end faces of rotating shafts fixedly connected to the gears are connected with a standard acceleration sensor and the six-dimensional acceleration sensor to be calibrated through inclined blocks respectively. A rack is arranged on the other sliding platform. A fine adjustment mechanism can be used for adjusting distances between the gears and the rack. The six-dimensional acceleration sensor can be comprehensively calibrated in different working modes by controlling the fitting and separation states of the gears and the rack and the running and stopping states of two motors.

The invention discloses a micro Fourier transform spectrometer comprising a light source and an interference system, wherein the interference system comprises a first beam splitter mirror, a movable mirror and a fixed mirror, a light beam emitted by the light source irradiates onto the first beam splitter mirror, the first beam splitter mirror divides a light beam into two paths, one path of the light beam irradiates the movable mirror, the other path of the light beam irradiates the fixed mirror, two light beams reflected by the movable mirror and the fixed mirror are reflected onto the first beam splitter mirror to form interference light paths and generate interference fringes, the movable mirror is an MEMS (Micro-electromechanical Systems) micro-mirror, the fixed mirror is an MEMS micro-mirror or a plane mirror, and if the fixed mirror is the MEMS micro-mirror, the fixed mirror generates displacement so as to perform phase modulation. The micro Fourier transform spectrometer disclosed by the invention is accurate in precision and small in volume.

The invention relates to a marine diesel engine sliding main bearing thermoelectricity signal calibration device. The diesel engine sliding main bearing thermoelectricity signal calibration device comprises an industrial computer, a programmable logic controller, a servo driver, a data acquisition card, a motor, a front supporting bearing, a rear supporting bearing, an experiment bearing, a rotate speed sensor, a thermoelectricity sensor, a torque sensor, a tile back temperature sensor, a lubricating oil temperature sensor, a lubricating oil pressure sensor, a hydraulic cylinder, a hydraulic oil tank, a hydraulic pump, a lubricating oil tank, a lubricating oil pump, a lubricating oil heater, a hydraulic sensor, and a displacement signal sensor. According to the technical scheme, a flexible feedback control strategy is adopted, the steady transition of rising and falling rotation speed and regulation of loading is guaranteed, a stable variable working condition is provided for testing the bearings, and thus dynamic calibration of thermoelectricity signals is achieved.

The present invention relates to a dynamic threshold timing circuit, comprising: a comparator having a first input terminal capable of receiving an external input signal, a second input terminal capable of receiving a detection threshold, and an output terminal; a time-to-digital converter which is coupled with the output end of the comparator so as to acquire time information of an output signalof the comparator; a controller which is configured to be capable of receiving the external input signal, generating the detection threshold value according to the external input signal and providingthe detection threshold value for the second input end of the comparator, wherein the detection threshold value is related to noise in the external input signal.

The invention discloses a fine-tracking control system for optical communication. The fine-tracking control system comprises an image detector, a beam expanding mirror, a position sensor, a spectroscope, a tracking mirror, a sighting telescope and a laser. The tracking mirror receives target light; the beam route of a target light is provided with the tracking mirror, the spectroscope and the image detector in order; the laser outputs beacon light and is provided with the sighting telescope, the spectroscope and the tracking mirror on the beam route of the beacon light in order; and the beam route of the beacon light is provided with the sighting telescope, the spectroscope and the tracking mirror in order. The control system provided by the invention is mainly used for high-precision stable control of the optical communication. The system disclosed by the invention utilizes the sighting telescope to correct the difference between the position of the light and the position of the optical axis of the beacon light and enables the difference to be zero in essence. The system provided by the invention is realized as follows: the tracking mirror is in closed loop by utilizing the position of the target light provided by the image detector. The position sensor provides the position of the optical axis and the sighting telescope is in closed loop so as to enable the difference to approach zero.

The invention discloses a high-precision dynamic calibration method applied to a quartz flexible accelerometer. The method comprises the steps that sinusoidal vibrational excitations with different frequencies and different amplitudes are applied to the quartz flexible accelerometer, and a dynamic calibration function of a frequency domain is obtained by conducting FFT and least square method curve fitting on an accelerometer analog voltage amplitude frequency domain sequence obtained through measurement; the FFT is carried out on acceleration analog signals obtained through measurement during a test, then a dynamic calibration function is adopted for correction, the IFFT operation is carried out after correction is carried out, and finally calibrated and measured acceleration time domain data can be obtained. According to the high-precision dynamic calibration method, dynamic amplitude-frequency response characteristic calibration is carried out on the quartz flexible accelerometer, non-linear errors can be corrected, and the high-precision dynamic calibration method is effective and can achieve the purpose that the measurement precision of the quartz flexible accelerometer within the frequency range is ensured.

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 discloses a direct current motor output torque calibration device, which is characterized in that an alternating current servo motor, a planetary reducer, a conductive slip ring, a torque sensor and a direct current motor to be calibrated are assembled on a calibration platform, central axes coincide, and the planetary reducer is connected with the alternating current servo motor; one end of the conductive slip ring is connected with an output signal line of the torque sensor, and the other end is connected with a controller; and the controller comprises a direct current motor drive current measuring module, a torque sensor voltage signal measuring module, a motor drive control module and a communication module. In addition, the device can set the servo motor to rotate at a certain speed, and thus the dynamic calibration of the direct current motor is realized. The device has the advantages of simple implementation, convenient operation and high working efficiency, and can accurately calibrate the relationship between the output torque of the direct current motor and the driving current, and thus the control efficiency of the direct current motor is improved, and thecontrol effect of the direct current motor is improved.

The embodiment of the invention discloses a vehicle-mounted camera calibration method and device, a vehicle-mounted camera and a storage medium. The method comprises the following steps: acquiring coordinate parameters of left and right lane lines in a world coordinate system from an image acquired by the camera; mapping the left lane line and the right lane line to a customized virtual two-dimensional image according to the coordinate parameters, obtaining the intersection point of the left lane line and the right lane line obtained through mapping, and building a mapping relation between the virtual two-dimensional image and the customized coordinate range of the world coordinate system; combining the M frames of images to obtain N cross points in the virtual two-dimensional image, one frame of image corresponds to one cross point, M and N are positive integers, and N is not larger than M; selecting a target intersection meeting a preset standard from the N intersections; based on a world coordinate system, mapping the target cross point to a camera coordinate system to obtain a calibration reference point; acquiring a deviation angle of the calibration reference point relative to a camera coordinate system; calculating the offset angle of the camera relative to the ground reversely through the intersection point, so that the calculation amount is small, and the accuracy is high.

The invention discloses a torque measuring system special for a butt-joint lock driving combination and an in-situ calibration method. The device comprises an upper computer, a torque accurate loading module, a torque overload protection module, a torque measuring module, a torque and rotating speed sensor in-situ calibration module, a torque transmission module, a high and low temperature environment controller, a supporting frame and an experimental platform. In calibration, the torque and rotating speed sensor is calibrated through a standard sensor. In torque measurement, under the temperature of each point, the measurement value of the torque and rotating speed sensor is recorded, and a torque set value is compared with the measurement value of the torque and rotating speed sensor, so that the torque output of the lock-joint driving combination under the measurement point can be obtained, and the test of the lock-joint driving combination is completed. According to the system and method of the invention, the torque and rotating speed sensor can be calibrated without being dismounted, and the output torque characteristic of the lock-joint driving combination can be measured at the high and low temperature of-70 DEG C to 100 DEG C.

The invention discloses an on-line calibration system and method of a PM2.5/PM10 light scattering particulate matter monitor. The on-line calibration system consists of a particulate matter dynamic dilution and laminar flow mixer, a high efficiency filter, an air compressor, a frequency conversion fan, a mass flow controller, a constant speed sampling head, a particulate matter filter membrane collector and a constant current sampler. The on-line calibration system and method can calibrate the zero point, linearity and indication error of an instrument, eliminate the influences of environmental factors on the measurement results, and ensure the traceability and reliability of the measurement results. The calibration system and method can be integrated into a light scattering particle monitor, and can also be used as an independent calibration system to realize self-calibration, dynamic calibration and current calibration of the light scattering particle monitor.

The invention discloses a radar's criterion module, comprising: a receiver component used to receive a radar radiation signal and to carry out AD sampling treatment on the radar radiation signal to obtain a sampling signal; and a signal processing module configured to be connected with the receiver component and a storage module so as to process the sampling signal and to transmit the obtained emission spectrum characteristics to the storage module to be stored. The signal processing module configures the trigger delay time according to the received instruction and generates a criterion signal with a preset pulse width. The criterion signal is synchronous with the pulse repletion frequency of the radar signal, and is started at the preset pulse width prior to the next sampling time point of the radar. The radar's criterion module overcomes the problem in the prior art that the standardizing and effecting is impossible, and the dynamic criterion of a radar signal can be realized, which increases the radar detection accuracy.

The invention discloses an alignment calibration system based on the Beidou. The system comprises an antenna servo device, an emitting cabinet, a receiving cabinet and a control terminal. The emitting cabinet is connected to the antenna servo device so as to emit a signal through the antenna servo device. The receiving cabinet is connected to the antenna servo device so as to receive an echo signal corresponding to the emission signal. The criterion source or the noise source is coupled to the echo signal and amplification and amplitude limiting processing is performed on the coupled signal. The control terminal is connected to the receiving cabinet so as to control the criterion source or the noise source to be coupled into the signal and displays the processed signal. According to the invention, the problem that the radar in the prior art fails to carry out dynamic calibration is solved and dynamic calibration of the Beidou signal is achieved.

The invention discloses a dynamic calibration system and method of a torque and rotating speed measuring device. The system comprises a controllable driving device, a standard torque and rotating speed measuring device, a calibrated torque and rotating speed measuring device and a variable load which are sequentially arranged and coaxially installed. Winding couplers are installed between the standard torque and rotating speed measuring device and the calibrated torque and rotating speed measuring device and between the calibrated torque and rotating speed measuring device and the variable load respectively. And the controllable driving device, the standard torque rotating speed measuring device and the variable load are all electrically connected with a data acquisition and analysis control system. In the invention, indication values of the standard torque rotating speed measuring device and the calibrated torque rotating speed measuring device are compared to realize quantity value calibration; and dynamic synchronous calibration of torque and rotating speed parameters is completed through one-time installation, calibration time is greatly shortened, a problem that the calibration state and the actual use state of a calibrated instrument are inconsistent is solved, and accuracy and reliability of torque and rotating speed parameter values are guaranteed.

The invention discloses a radar calibration system which comprises a calibration module and radar equipment, wherein the radar equipment is provided with a plurality of communication interfaces. The calibration module is connected with the communication interfaces. The radar equipment performs communication and monitoring on the calibration module through the communication interfaces. The radar calibration system has advantages of overcoming a problem of incapability of calibrating meteorological radar in prior art, realizing dynamic calibration of a radar signal and improving radar detection precision. The calibration module is wholly utilized in the radar field, thereby improving calibration accuracy.