10results about How to "Realize self-calibration" patented technology

The invention provides a self-correction method of a laser radar, the laser radar, a device, electronic equipment and a computer readable storage medium, and relates to the technical field of radars, and the method comprises the steps: setting a first identifier and a second identifier which are different in position and reflectivity on the inner wall of the peripheral side of a diaphragm of the laser radar in advance, the method comprises the following steps: firstly, controlling a laser transceiving device to emit a laser beam, then acquiring a first echo signal of a first identification reflection laser beam and a second echo signal of a second identification reflection laser beam, and then calculating difference information between the first echo signal and the second echo signal; therefore, the working parameters of the laser transceiver are determined according to the difference information and the preset difference information, the self-correction of the working parameters of the laser radar is realized, the correction work does not need manual participation, does not need specific correction equipment, is not limited by sites, and is beneficial to improving the efficiency of the correction work.

The embodiment of the invention provides a calibration method and device of near-to-eye display equipment, a medium and the near-to-eye display equipment. The calibration method of the near-to-eye display equipment comprises the following steps: when an attitude parameter between an optical machine and a camera changes, acquiring a current attitude parameter of the camera; forming a current test point projected by the camera based on the current attitude parameter of the camera; and if the current test point projected by the camera and the actual display point projected by the ray machine are staggered, on-line calibration between the ray machine and the camera is triggered. In the technical scheme of the embodiment of the invention, if the current test point projected by the camera and the actual display point projected by the light machine are staggered, the calibration operation between the light machine and the camera is triggered, so that the calibration between the light machine and the camera is completed based on the adjustment of the current test point projected by the camera and the actual display point projected by the light machine; and the automatic calibration of the equipment after leaving the factory is realized.

The invention provides an autonomous calibration method for rigidity of a flexible actuator. The method comprises the steps that the output force of each flexible actuator is adjusted based on a flexible actuator kinematic model obtained through construction, so that the output force is in a sine wave form; whether the output force of the flexible actuator at the current moment is larger than a preset calibration threshold value or not is judged; if yes, calibrating the flexible actuator based on an actuator flexibility calibration formula to obtain a flexibility calibration value of the flexible actuator; if not, taking the next moment as the current moment, and returning to the step of judging the output force of the flexible actuator; whether the difference value between the flexibility calibration value at the current moment and the flexibility calibration value at the previous moment is larger than a calibration end threshold value or not is judged, and if yes, the step of judging the flexibility calibration value is executed again; and if not, calibrating the rigidity of the flexible actuator based on the flexibility calibration value at the current moment. According to the scheme, autonomous calibration of stiffness characteristic parameters of the flexible actuator during on-orbit operation of a spacecraft can be realized.

The invention provides a laser frequency stabilization and self-calibration device of a differential absorption laser radar, which is characterized in that an emergent light beam of a seed laser of the laser radar is divided into two beams, one beam is emitted into the atmosphere through high-power pulse laser output units connected in series, and back scattering light of the atmosphere is collected and detected by a receiving optical unit; and the other beam is input into a series weak-power continuous laser output unit and enters a long-optical-path absorption cell, and transmission light of the beam is detected. And the two paths of detection signals are simultaneously sent to the signal processing board. According to the invention, the output light frequency of the laser is locked on a gas absorption spectral line by utilizing a detection signal of the long-optical-path absorption cell and adopting an active frequency stabilization technology, so that a laser frequency locking function is realized. Meanwhile, the gas concentration in the long-optical-path absorption cell is known, and the real-time absorption section of the gas is measured based on the Lambert-Beer law, so that the self-calibration of the system is realized.

The invention provides a visual positioning measurement method and system based on a micro-coding target. The method comprises the following steps: acquiring a target image through a module camera matched with a miniature microscope lens, and firstly, realizing automatic estimation of a distortion center through minimizing a phase nonlinear residual by using global linear structure characteristics of an orthogonal dot matrix in a frequency domain and a phase domain; on the basis, low-order radial and tangential distortion parameters are solved by adopting closed weighted least squares, so that single-image lens distortion correction is realized; then, a plurality of target images at different local positions are shot from different positions, each image is decoded to obtain global position information of the photoetching plate corresponding to the feature points, self-calibration of the camera is achieved, and internal parameters of the camera are obtained; and finally, performing two-dimensional Fourier transform on the acquired target image, performing unwrapping by using phase information of a complex field, and fusing and outputting the absolute position of the camera in combination with decoding information of the image.

The invention discloses a system and a method for controlling the position of a main valve core of a pilot-operated electro-hydraulic proportional valve, and relates to the technical field of pilot-operated electro-hydraulic proportional valve control, the system mainly comprises four modules: (1) a data acquisition and processing module for acquiring the position of the main valve core and the current data of a driver and filtering the data; (2) the control module calculates a target current value of the driver according to a set target value, a feedback value of the data acquisition module and a set control algorithm by adopting a feedforward-feedback composite control strategy; (3) executing a driving module, and adjusting the opening degree of a pilot valve according to the target current value to enable a main valve core to reach an expected value; and the dead zone parameter identification module (4) is used for estimating dead zone parameters of the electro-hydraulic proportional valve on line. According to the method, the problem of high-precision control of the position of the valve element when dead zone parameters of the electro-hydraulic proportional valve are unknown or change can be solved, and self-calibration of the electro-hydraulic proportional valve and self-adaptive control of the position of the valve element are achieved.

This invention provides a self-calibration method and system for a turnstile system capable of shielding against multi-source interference. Applied to the field of access control technology, the method involves acquiring images using a 3D vision device, detecting the turnstile blades, clustering their spatial distribution, and calculating geometric calibration parameters to achieve channel self-calibration. Based on depth images, background modeling and updating are performed, incorporating static structures into the background to form static shielding areas. The active areas of the blades are determined according to the geometric calibration parameters. When blade movement is detected, dynamic shielding is applied to the foreground within the active area to suppress static appearance interference and blade opening / closing interference. The system includes modules for image acquisition, blade detection and clustering, geometric parameter calculation, background modeling and updating, static appearance shielding, blade movement shielding, and real-time detection optimization. This invention reduces deployment and maintenance costs, decreases false positives and false negatives, and improves the stability and robustness of detection and measurement in complex environments.

The invention belongs to the technical field of hydraulic motor testing, and particularly relates to a hydraulic motor testing system with multiple loading modes, which comprises a power system, a testing control unit, a testing rack and a measurement and control system, the power system is used for providing a power source for the whole system; the test control unit is used for receiving a control signal of the measurement and control system and driving the execution unit to work; the test bench comprises a test motor, a torque meter and a loading motor; the measurement and control system comprises a power cabinet and a control cabinet and is used for completing electrical control and testing of the system. The test system can perform a hydraulic motor endurance test; testing displacement, leakage and torque; performing a lateral load test; and test contents such as a backpressure loading test and the like meet various requirements of hydraulic motor tests.

This invention relates to a method, apparatus, device, and medium for self-calibration error compensation in TMR current acquisition. The method dynamically injects a reference signal into the TMR current acquisition circuit through a built-in standard signal excitation source module; synchronously acquires the mixed response of the original signal and the reference signal; separates the original signal and the reference signal in the mixed response using digital signal processing technology to obtain the measured values ​​of the original signal and the reference signal; analyzes the difference between the measured values ​​of the reference signal and the reference signal in real time, establishes a multi-dimensional error vector, and obtains a dynamic error compensation matrix. The dynamic error compensation matrix includes a compensation amplitude term, a compensation phase term, and a compensation harmonic distortion term, with adaptive weight coefficients for each term determined based on the signal-to-noise ratio, phase difference, and frequency, respectively; and dynamically corrects the measured value of the original signal based on the dynamic error compensation matrix to achieve adaptive error compensation. Compared with existing technologies, this invention has advantages such as the ability to achieve adaptive calibration.

The invention relates to a TMR current acquisition self-calibration error compensation method, device and equipment and a medium, and the method comprises the steps: dynamically injecting a reference signal into a TMR current acquisition loop through a built-in standard signal excitation source module; synchronously acquiring the mixed response of the original signal and the reference signal; separating an original signal and a reference signal in the mixed response based on a digital signal processing technology to obtain an original signal measurement value and a reference signal measurement value; the difference between the reference signal and the reference signal measurement value is analyzed in real time, a multi-dimensional error vector is established, an error dynamic compensation matrix is obtained, the error dynamic compensation matrix comprises a compensation amplitude item, a compensation phase item and a compensation harmonic distortion item, and the self-adaptive weight coefficients of the items are determined based on the signal-to-noise ratio, the phase difference and the frequency; and dynamically correcting an original signal measurement value based on the error dynamic compensation matrix to realize adaptive error compensation. Compared with the prior art, the method has the advantages of being capable of achieving self-adaptive calibration and the like.