98results about How to "Real-time calibration" patented technology

Disclosed are a transmitting and receiving apparatus and method in an adaptive array antenna system capable of real-time calibration. Transfer functions in the transmitting and receiving apparatus are estimated by injecting a calibration signal to each of transmit and receive channels and analyzing the signals that has passed through the transmit and receive channels. An RF CW sinusoidal signal of a single frequency can be used as the calibration signal to simplify a process of signal processing in a baseband. In addition, in the calibration of the receiving apparatus, gains of all receive channels are controlled using an identical signal. Thus, a relative transfer function characteristic of the receive channels is constant irrespective of the gains of the receivers.

A calibrating method for big modulation bandwidth linear FM signal frequency response relates to the technical field of testing, comprising the steps of: 1) dividing a radio frequency signal in a complete frequency range generated by a calibrating device into a plurality of frequency sections F0 to F1, F1 to F2,..., FM-2 to FM-1 and FM-1 to FM, for calibrating section by section, 2) confirming N+1 calibrating points on a single calibrating frequency section, 3) dynamically acquiring a log amplifying sensitivity R, 4) translating and searching the smallest carrier power, and 5) automatically calibrating frequency points FM one by one. The method of the invention automatically calibrates and compensates basing on the linear FM signal frequency response of an interior detection circuit and an agility damping circuit in the calibrating device and the frequency response calibration can be automatically performed without an additional testing and calibrating device for user to perform real time calibration on site. The detection circuit and the agility damping circuit are both located in a modulating channel, so not only the frequency response of linear FM signal generating module is calibrated but also the whole passage is calibrated.

The invention discloses an array antenna channel calibration system for a plane wave simulator, which comprises a plane wave simulator array antenna comprising multiple sub units, a regulating networkfor controlling the amplitude and the phase of each sub unit, a calibration probe antenna or probe array with a fixed and known position, a vector network analyzer, a connector cable and other accessories. The calibration system adopts a vector superposition principle, through control on the phase of the tested array antenna channel, in a far field area of the antenna from the two-dimensional array antenna aperture unit channel, a transmission coefficient (S21) value when the phase of the tested array antenna channel changes is acquired, and thus, the channel amplitude and phase difference isanalyzed. The channel calibration system has a wide application range and can be used for consistency calibration on the unit channels of the array antenna, especially for the unit channel calibration of the planar wave generator array antenna.

The invention relates to an on-line self-calibration laser-adsorption-spectrum trace gas analysis method and the laser-adsorption-spectrum trace gas analysis device employing the method. The method comprises establishing a calibration gas chamber in the measuring light path, adding the standard gas the same as the gas to be measured in the calibration chamber, and calculating the concentration of the gas to be measured by detecting the original light intensity and the line intensity of the measuring light path and the calibration light path irrespective of the gas temperature and the pressure. The method for measuring the concentration of the gas to be measured is simple and accurate, and the device employing the method is also simplified remarkably and can realize real-time self-calibration.

The invention discloses a radio frequency channel real-time calibration method and a secondary radar. The method comprises the steps that the main unit of the secondary radar controls a calibration source to transmit a first calibration signal to a receiver of the secondary radar, wherein the frequency range of the first calibration signal is matched with the working band of the secondary radar; the receiver obtains a standard parameter value of a standard channel of N receiving channels and (N-1) first parameter values of (N-1) receiving channels, except the standard channel, of the receiver based on the first calibration signal, wherein N is an integer which is greater than or equal to 2; the main unit adjusts the (N-1) actual first parameter values of the (N-1) receiving channels based on the (N-1) first parameter values, and obtains (N-1) adjusted actual first parameter values which are consistent with the standard parameter value.

This invention provides a method and a device for carrying out real-time calibration on radio-frequency responses of a multi-channel receiver, and relates to the technical field of wireless communication. The method provided by the invention comprises the following steps of: sending an initial test signal generated by a calibrating transmitting channel to each receiving radio-frequency channel during a calibrating timeslot; acquiring a radio-frequency response signal of each receiving radio-frequency channel, and carrying out a deconvolution operation by using the signal and radio-frequency response signal of each receiving radio-frequency channel so as to obtain a response of each receiving radio-frequency channel; and carrying out compensation calibration on the receiving radio-frequency response of each receiving radio-frequency channel by using the response of each receiving radio-frequency channel. In the process, the acquisition of responses of each receiving radio-frequency channel can be realized in the multi-channel receiver, therefore, in actual applications, each receiving radio-frequency response of the multi-channel receiver can be accurately and conveniently calibrated in real time in various application scenes.

The invention relates to a micro-thrust measuring device with on-line calibration and locking functions. The micro-thrust measuring device is used for the parameter testing of the ground long-life test of a Hall effect thruster. In order to measure the real-time thrust value of the Hall effect thruster under a plurality of working conditions in the long-life test process of the Hall effect thruster, a thruster to be tested is installed on a movable frame; the movable frame swings with low amplitude under the action of the thrust of the Hall thruster; the displacement sensor of an electromagnetic feedback assembly performs detection; swing displacement signals are inputted into a PID feedback control circuit; and an electromagnetic feedback force is in linear relation with coil current outputted by the PID circuit; the static characteristic of a thrust frame is calibrated through a standard mass weight in advance, so that the magnitude of the thrust can be obtained. According to the device of the invention, the electromagnetic feedback force method is adopted to carry out multi-times and multi-working-condition real-time on-line measurement on the Hall effect thruster; an on-line calibration and locking device is adopted to lock and unlock the micro-thrust measuring device a plurality of times, so that the static characteristic of the micro-thrust measuring device is obtained inreal time, and the accuracy and reliability of a thrust test are ensured.

The invention, which belongs to the technical field of ink-jet printing, provides an ink droplet ejection state adjusting system and method for a piezoelectric printing nozzle. The system is composed of a computer computing platform, a nozzle drive controller, a piezoelectric printing nozzle and a CCD camera. One end of the nozzle drive controller is connected with the computer computing platform and the other end is connected with the piezoelectric printing nozzle; and the CCD camera is connected with the computer computing platform. The nozzle drive controller generates a drive signal for the piezoelectric printing nozzle and simultaneously carries out time sequence controlling on the drive signal; the piezoelectric printing nozzle fluctuates in an ink cavity under the drive signal provided by the nozzle drive controller and the fluctuation is spread to spraying holes to form ink droplets; and the CCD camera captures states of ink droplets ejected by the piezoelectric printing nozzle.

A workpiece length measurement device comprises a left limit switch, a transmission mechanism, a sliding body, a photoelectric switch, a right limit switch, a stepper motor, a calibration scaleplate, an encoder, a controller and an industrial personal computer, wherein the transmission mechanism comprises a conveying belt and a transmission device. By shielding or reflecting light beams emitted by the photoelectric switch through a measured object, whether the object exists or not is detected; the length or the width of the measured object is detected through the photoelectric switch sliding along with the sliding body. The moving distance of the photoelectric switch can be conveniently acquired through the number of pulses of the encoder, and therefore the length of the measured object can be measured. In order to solve the problem that the length of the measured object is irrelevant to the photoelectric switch, the stepper motor and other parameters and make the measurement device be popularized and adapt to the measured object easily, real-time calibration is achieved by adding the calibration scaleplate, and the workpiece length measurement device can be accurately used permanently. The workpiece length measurement device not only is convenient to install and low in cost but also is high in measurement accuracy, stable and reliable in running, and convenient to popularize for use.

A smart Electric Vehicle Supply Equipment (“EVSE”) that will accept input from different sources to determine the max rate of charge an Electric Vehicle (EV) can be safely charged at without overloading the electrical system of the residence. The system will also communication signals from the power company, fire department and police to reduce or eliminate the charging of the battery in the EV if the situation requires. The smart EVSE further comprises a non-invasive current and/or load sensing unit coupled to the power source for recharging the battery or batteries in the EV, cables to connect the load sensing unit to the EVSE, and optional wireless communication transmitter (sensor to EVSE), EVSE unit with compensating ability.

The invention discloses a phased array radar system transceiver unit and an error calibration method thereof. The phased array radar system transceiver unit comprises a horizontal polarized link and a vertical polarized link and is characterized by further comprising a controller, a directional coupler and a switch matrix unit, wherein the directional coupler is used for sampling radar emission signals and receiving calibration signals, the switch matrix is used for providing a common return for the horizontal polarized link and the vertical polarized link so as to realize automatic and real-time calibration of relative errors of the horizontal polarized link and the vertical polarized link of a radar system, and the phased array radar system transceiver unit is additionally provided with the directional coupler and the open matrix unit on the basis of a traditional phased array radar system transceiver unit.

The invention discloses a multi-spectral radiation temperature measuring system and a multi-spectral radiation temperature measuring method. The multi-spectral radiation temperature measuring system comprises a wide-spectrum light source, and an incident collimating lens group, an emergent collimating lens group and a spectrograph which are sequentially arranged on an emergent light path of the wide-spectrum light source. A to-be-measured flame is arranged between the incident collimating lens group and the emergent collimating lens group. According to the multi-spectral radiation temperature measuring system, an emissivity coefficient self-calibration system is arranged on the same path as the measured flame. Flame emissivity coefficients under different wavelengths are obtained by recording spectral parameters of the wide-spectrum light source, the flame and the wide-spectrum light source plus the flame. The method is used for correcting parameters of the multi-spectral radiation temperature measuring system, overcomes model error in traditional theory calculation correction and improves the measurement uncertainty.

The invention provides a traffic monitoring model calibration method and system based on physical coordinates of a marking dotted line, and the method comprises the following steps: 1), determining an internal parameter matrix of a road monitoring camera through a VLH self-calibration algorithm; 2), solving the posture parameters of a camera through the internal parameter matrix determined at step 1) and the coordinates of the marking dotted line in a traffic video; 2), obtaining the posture parameters of the camera after the execution of step 2), transmitting the posture parameters to a traffic monitoring model, carrying out the corresponding analysis calculation of the posture of the camera through the traffic monitoring model, and obtaining an accurate road monitoring result. The calculation speed of the traffic monitoring module is higher than the speed of a conventional camera calibration method. The method achieves the real-time calibration, is high in robustness, and is convenient in obtaining based on the coordinates of the marking dotted line. The method can achieve the quick calibration of traffic monitoring facilities through an actual road traffic video, and can achieve the real-time and accurate simulation of traffic video conditions.

The invention relates to a calibration device and method for a micro-thrust measurement system, belonging to the technical field of micro-thrust measurement of electric thrusters. The calibration device is mainly composed of a thruster, elastic parts, filaments and a calibration system; the calibration system is mainly composed of a lead screw, an electronic tension gauge, a stepping motor and a platform; one end of the elastic part is hoisted in a vacuum environment, and the other end is connected to the thrust connected to the thruster, perpendicular to the transverse centerline of the thruster; one end of the thruster is connected to one end of the electronic tension gauge through a filament, and the straightening direction of the filament in the straightened state is consistent with the direction of the transverse centerline of the thruster; the stepping motor The lead screw is fixed on the platform, the stepper motor is connected with the lead screw, the axis direction of the lead screw is parallel to the straightening direction of the filament, the electronic tension gauge is fixed on the lead screw, and the stepper motor, electronic tension gauge and filament are arranged in sequence. The calibration accuracy of the calibration device does not require evaluation of the effects of friction; real-time calibration of the thrust measurement system is possible.

The invention relates to the technical field of laser measurement, in particular to a laser ranging optical axis consistency dynamic calibration method and system. The laser ranging system comprises alaser 1, an emission light path, a receiving light path and a signal receiving and processing device 2, the light path is provided with a laser receiving and transmitting lens 3, a first fixed reflecting mirror 4, a hollow reflecting mirror 5, an FSM reflecting mirror 6, a piezoelectric deflection table 7, a narrow-band light filter 8 and a receiving optical assembly 9. The transmitting light path is adjusted for preset manner scanning, and the emission angle corresponding to the echo power peak value point meeting the system receiving-emitting optical axis error range requirement can be obtained through analysis and comparison, the piezoelectric deflection table is used for driving the FSM reflecting mirror to deflect, the emission light path is controlled to emit laser along the angle corresponding to the power peak value point, and therefore the consistency of the laser receiving-emitting optical axis is guaranteed, and the problem that the measurement range and precision of the ranging system are sharply reduced due to the fact that the parallelism of the laser receiving-emitting optical axis is degraded is solved.

The invention discloses a method and a device for background digital calibration of a production line ADC (analog-to-digital converter). The device comprises an adaptive filter, a high-precision ADC redundancy sublevel, a data selection module, a data distribution module, a multiway switch module and a control signal generation module. The method includes: firstly, the control signal generation module controls the data selection module, the data distribution module and the multiway switch module, and the high-precision ADC redundancy sublevel and the adaptive filter perform initialization calibration sequentially from the first level to the j level of the production line ADC to enable the production line ADC to operate in a high-precision output state; secondly, during normal operation of the production line ADC, the control signal generation module controls each module to perform random calibration from the first level to the j level of the production line ADC so as to prevent ADC performance reduction resulted from an external environment and an internal environment of a chip. The method and the device for background digital calibration of the production line ADC have the advantages of small calibration errors and high calibration precision.

The invention discloses a self-calibration device and method for an emission rate coefficient of a multi-spectrum radiation temperature measuring system. The device comprises a wide spectrum optical source as well as an incidence collimating lens group and an outgoing collimating lens group which are arranged at the outgoing optical path of the wide spectrum optical source in sequence; a flame to be measured is arranged between the incidence collimating lens group and outgoing collimating lens group. The emission rate coefficient self-calibration system is arranged on the same path, penetrating through the measured flame, of the multi-spectrum radiation temperature measuring system, the emission rate coefficients of the flame under different wavelengths are obtained by recording the spectrum parameters of the wide spectrum optical source, the flame and the combination of the wind spectrum optical source and the flame, and the self-calibration device is used for the parameter calibrating of the multi-spectrum radiation temperature measuring system and overcomes the model error in the traditional theoretical calculation correction, so the measuring uncertainty is reduced.

The invention is applied to the technical fields of sensing control of industrial robots, and provides a method and device for calibrating sensor postures of a robot in real time and terminal equipment. A binding position of a sensor is arranged on the robot; and the sensor is arranged on the binding position. The method for calibrating sensor postures of the robot comprises the following steps: building a robot motion coordinate system and a sensor coordinate system; controlling orientated motion of the sensor; acquiring six-dimensional posture data; calculating an initial posture relation ofthe sensor coordinate system relative to the robot motion coordinate system; calculating posture converted quantity of the binding position relative to the robot; and calculating the posture relationof the sensor relative to the robot according to the posture converted quantity of the binding position relative to the robot and the initial posture relation of the sensor coordinate system relativeto the robot motion coordinate system. According to the method and device for calibrating sensor postures of the robot in real time disclosed by the invention, the phenomenon that control errors caused by the change of the sensor postures during control of the positions and the postures of the robot is avoided.

The invention discloses a dynamic truck scale metering method capable of automatically fitting parameters. The method includes sample data preprocessing, processing the collected redundant data; determining speed adjustment parameters and final data storage forms of different speed intervals; determining a measurement abnormal value of the dynamic truck scale; when a non-verification vehicle withunknown vehicle total weight passes through the dynamic truck scale, calibrating the dynamic truck scale. Through different dynamic truck scale measurement values, the vehicle is compared and an abnormal condition is determined. When a verification vehicle with known total weight of the vehicle passes through the dynamic truck scale, the abnormal condition of the verification vehicle is judged through comparison of a measured value and an agreed true value, abnormal dynamic truck scale parameters are automatically fitted, abnormal data points are extracted, the distribution condition of the abnormal data points is analyzed, and parameters needing to be adjusted and parameter values suggested to be adjusted are determined. The method is not limited by the type of the dynamic truck scale, does not need manual intervention, can achieve the full-automatic metering of the dynamic truck scale in time, greatly reduces the labor cost, can guarantee the metering performance, and improves the metering efficiency.

The invention provides a time synchronization method, device and system and a storage medium. The time synchronization system comprises a first part and a second part, the first part and the second part are mechanically coupled, the first part and the second part can move relatively, and the first part and the second part are in wireless communication connection. The method comprises the steps that the second part receives first time axis information and first motion parameters sent by the first part, wherein the first motion parameters correspond to the first time axis information and are used for representing the motion relation between the first part and the second part; the second part determines second time axis information corresponding to the first motion parameter in a local secondtime axis; and the second part adjusts the second time axis according to the first time axis information and the second time axis information, so that the second time axis is synchronized with the first time axis. According to the method, the influence of wireless communication delay on time axis synchronization can be relieved to a certain extent, and the synchronization efficiency is improved.

The invention relates to an endoscope calibration system and method. The endoscope calibration system includes an endoscope module, a calibration target module, and an optical tracking module, wherein the endoscope module includes a front end of the endoscope module, and an endoscope camera located in an endoscope camera channel; the calibration target module is a calibration plate such as a flat plate with an equally-spaced solid circle array pattern or a flat plate with a checkerboard pattern; the optical tracking module includes an optical tracker positioned at the front end of the endoscope, an optical tracker attached to a calibration target, and an optical position sensor. The invention also relates to an endoscope calibration method. According to the invention, the endoscope calibration can be carried out effectively, conveniently and accurately, and the working channels of the endoscope cannot be occupied additionally. The endoscope calibration system and method can be used for the real-time surgical navigation.