47results about How to "Eliminate Calibration Errors" patented technology

Disclosed herein is a phase-locked circuit including: a phase-locked section including a voltage controlled oscillator having a capacitance bank and changing oscillation frequency according to voltage information, the phase-locked section phase-locking an oscillating signal of the voltage controlled oscillator to a reference signal; and a calibration section having a voltage correcting function for supplying an appropriate calibration voltage to the voltage controlled oscillator in performing frequency calibration for the voltage controlled oscillator; the calibration section including a counter circuit, a first storage circuit and a second storage circuit, a comparator circuit, a control circuit, a voltage generating circuit, and a processing circuit.

The application relates to a calibration method and apparatus of a pitch angle of a vehicle-mounted camera, an electronic device, and a vehicle. According to one embodiment, the calibration method comprises: an inertial measurement unit is used for determining a gravity direction; the inertial measurement unit tracks movement of a vehicle to obtain a first trajectory corresponding to a movement distance; a vehicle-mounted camera tracks the movement of the vehicle to obtain a second trajectory corresponding to the movement distance; an offset amount between the first trajectory and the second trajectory is determined and thus an included angle between the vehicle-mounted camera and the inertial measurement unit is determined; and on the basis of the gravity direction, the included angle between vehicle-mounted camera and the inertial measurement unit, and a pitch angle direction determined by the inertial measurement unit, a pitch angle of the vehicle-mounted camera is determined. According to the method provided by the application, with a full-automatic mode, real-time online calibration of the pitch angle of the vehicle-mounted camera is realized by combining the inertial measurement unit without any manual intervention, so that the calibration method and apparatus can be applied to the fields of automatic driving and the like widely.

The invention relates to a high-accuracy depth domain stochastic simulation inversion method suitable for designing a track of a horizontal well, which comprises the following steps: firstly, selecting typical wells according to a certain proportion to carry out calibration of a synthetic record; establishing solid models for the typical wells and repeatedly carrying out calibration fine adjustment by stratigraphic correlation; generating a time domain sparse impulse wave impedance data volume and establishing a well control velocity field; carrying out time-to-depth conversion on the obtained time domain sparse impulse wave impedance data volume; and using depth domain sparse impulse wave impedance data as a restriction and ensuring all the wells to participate in the depth domain stochastic simulation inversion, so that an inversion result can be used for designing the track of the horizontal well. According to the invention, only the typical wells need to be subjected to calibration of the synthetic record; and by carrying out comparison and analysis on a logging curve and the high-accuracy solid models, carrying out fine adjustment and calibration, establishing the well control velocity field and directly utilizing absolute depth information of the wells to carry out depth domain stochastic simulation restrained inversion, a calibration error of a non-typical well is absolutely eliminated and the depth prediction accuracy of a target layer aiming at the track of the horizontal well is greatly improved.

The invention relates to calibrating device used to increase mini-size bell jar volumetric measurement accuracy. It includes impounding container, four exhaust valves, eight glass cock valves, globe, electric-magnetic stop valve, silicone tube, tubule needle head type drainpipe, small caliber weighing cylinder. The glass pipeline is the main structure of the whole device. The calibrating method includes the following steps: connecting the pipeline as the calibrating device; complementing water and exhausting gas; adjusting their flow quantity; elevating the ball jar; finishing the calibrating by n is not less than 6 times. The invention realize super mini-size bell jar metering volume (minimum volume reaches 10ml) high accuracy calibrating, increase flow measurement accuracy of the micro gas flow calibrating device used super mini-size bell jar as main standard.

The invention discloses a calibration method of a multi-point co-beam rut detection device and a cross-section determination method. The calibration method comprises that the installation angle ai and horizontal coordinate ai of each laser among m lasers on a rut beam are determined, wherein the horizontal coordinate ai is a horizontal coordinate value, relative to a reference laser, of the ith laser, the reference laser is the laser located at the middle position of the rut beam, the i=1-m; the reading Hi irradiating on a calibration scale or a road of the laser light of each laser is collected; among the m lasers, the n lasers installed vertically are chosen, and the horizontal dip angle beta0 is determined by the reading Hi and the horizontal coordinate ai of the n lasers; the vertical position parameter Bi of the laser i is calibrated by using the horizontal dip angle beta0, i=1-m. The method provided by the invention has the advantage that the measurement accuracy of the cross-section can be effectively improved.

The invention discloses a clamp special for machining a pump body of a marine water-jet propulsion pump. The clamp comprises a clamp body. The clamp body is a quadrilateral plate body. A round locating pin and an annular round groove are sequentially arranged on the clamp body from the center to the outside. A diamond locating pin with the long diameter being parallel to the tangent line of the annular round groove is arranged at the position, close to the annular round groove, of the lower left corner of the clamp body. A U-shaped hinge pedestal parallel to the right end face of the clamp body is arranged at the position, away from the annular round groove, of the upper right corner on the same diagonal line with the lower left corner of the clamp body. A turnover plate which is composed of a long plate and a short plate and has an inverted-L-shaped section is arranged in a groove of the hinge pedestal and connected with the groove in a hinged mode through a pin shaft. A threaded hole is formed in the long plate of the turnover plate, and a locating screw is mounted in the threaded hole. Pressing plates are arranged on the clamp body and are in bilateral symmetry. The clamp special for machining the pump body of the marine water-jet propulsion pump is simple in structure, high in locating precision, low in manufacturing cost, capable of rapidly clamping workpieces and convenient to operate, and greatly improves the work efficiency.

The invention provides a field calibration system for a magnetoelectric sensor. The field calibration system for the magnetoelectric sensor comprises a digital acquisition device, a calibration circuit and a signal processing device; the digital acquisition device is provided with a voltage signal output end, a first signal input end and a second signal input end; the calibration circuit is provided with an excitation signal output end and a calibration signal output end; a voltage signal output end of the digital acquisition device is used for being connected with the excitation signal output end of the calibration circuit; the excitation signal output end of the calibration circuit is used for being connected with a magnetoelectric sensor to be calibrated; the calibration signal output end of the calibration circuit is connected with a first signal input end of the digital acquisition device; a second signal input end of the digital acquisition device is used for being connected with the magnetoelectric sensor to be calibrated and receiving vibration signals of the magnetoelectric sensor; the signal processing device is connected with the digital acquisition device, and is used for receiving two paths of signals from the digital acquisition device.

The invention discloses a calibration method of a multi-point co-beam rut detection device and a cross-section determination method. The calibration method comprises that the installation angle ai and horizontal coordinate ai of each laser among m lasers on a rut beam are determined, wherein the horizontal coordinate ai is a horizontal coordinate value, relative to a reference laser, of the ith laser, the reference laser is the laser located at the middle position of the rut beam, the i=1-m; the reading Hi irradiating on a calibration scale or a road of the laser light of each laser is collected; among the m lasers, the n lasers installed vertically are chosen, and the horizontal dip angle beta0 is determined by the reading Hi and the horizontal coordinate ai of the n lasers; the vertical position parameter Bi of the laser i is calibrated by using the horizontal dip angle beta0, i=1-m. The method provided by the invention has the advantage that the measurement accuracy of the cross-section can be effectively improved.

The invention discloses a method and device for calibrating the heading angle of a vehicle-mounted camera, electronic equipment and a vehicle. According to one embodiment, the method for calibrating the heading angle of the vehicle-mounted camera comprises the steps of tracking the movement of the vehicle by using a chassis odometer to obtain a first trajectory corresponding to a moving distance;tracking the movement of the vehicle by using the vehicle-mounted camera to obtain a second trajectory corresponding to the moving distance; enabling the first trajectory to rotate by a heading angleto obtain a third trajectory; and comparing the third trajectory and the second trajectory to determine the heading angle which enables the third trajectory to be the closest to the second trajectory,and enabling the heading angle to serve as a heading angle of the vehicle-mounted camera. The method disclosed by the invention can perform real-time on-line calibration on the heading angle of the camera based on a visual odometer and the chassis odometer in a full-automatic mode without manual participation, so that the method can be widely applied to the fields such as automatic driving and the like.

The invention relates to a method for quickly calibrating the zero position of a straightener. The method comprises the following steps: 1) preparing a standard calibration base plate; 2) accurately measuring the actual value of the height from the mounting bottom of each straightening roller box to the highest point of a roller; 3) solving a deviation value between the actual value of the heightfrom the mounting bottom of each straightening roller box to the highest point of the roller and a standard value; 4) calibrating the zero position; and 5) correcting the zero position. According to the technical scheme, the problems that an existing straightener zero position calibration technology is inaccurate in precision, complex in calibration method and the like are mainly solved, the zeroposition calibration precision can be greatly improved through the scheme, and the calibration operation efficiency is improved.

The embodiment of the present invention provides a method and system for calibrating weather radar based on UAV, which is characterized in that the method includes controlling a UAV equipped with an on-board calibration device to fly to a predetermined location by wireless communication through a ground console. Spatial position: controlling the airborne calibration device to calibrate the weather radar at the predetermined spatial position by wireless communication through the ground console. This method can solve the problems of high installation cost and inability to work under special terrain conditions in the existing signal source method, and at the same time solve the problem of inaccurate calibration results in the existing metal ball calibration method.

The invention discloses a new method for aircraft engine calibration, which calculates the working range of historically calibrated engine parameters, fits the central curve of the working range, and uses the engine parameter ground detection equipment to directly write the curve as the standard model value curve of the same type of aircraft. into the engine parameter converter. The invention directly writes the standard model value curve into the engine parameter converter through the engine parameter ground detection equipment, replaces the traditional engine parameter calibration method, saves labor costs, improves work efficiency, and has better practicability.

The invention relates to the field of a machining center box type part jig calibration and aims at providing a box type part jig accuracy calibration device and an accuracy calibration method. The box type part jig accuracy calibration device comprises an accuracy calibration base and an infrared probe system. The accuracy calibration base comprises a bottom plate and a vertical calibration plate, wherein the bottom plate is provided with at least two connecting blocks at the lower end surface, and the vertical calibration plate has one end surface provided with a calibration surface perpendicular to the bottom plate and is connected to the bottom plate at the lower end. The calibration surface is provided with at least a calibration hole penetrating through the other end surface of the vertical calibration plate. The lower end surface of each of the two connecting blocks is provided with a connecting through hole penetrating through the upper end surface of the bottom plate and a positioning hole. The infrared probe system comprises an infrared probe with a knife shank and a data transmission unit and a data receiver electrically connected to a controller of a machining center. The box type part jig accuracy calibration device is small in accuracy calibration errors and free of fouling and abrasion affecting calibration results.

The invention relates to a traveling wave calibration method based on near-field probe spatial resolution of a transmission line. The method comprises step 1, design of a near-field probe spatial resolution calibration scale; and step 2, calibration measurement of the near-field probe spatial resolution. The method constructs a spatial resolution calibration scale having resolvable field distribution features and the calibration precision adjustable within a certain range, in combination with amplitude precision given by a receiver or a spectrometer in a near-field EMI (Electro-Magnetic Interference) test system, based on the theory of the transmission line, using the multi-conductor planar transmission line as a construction platform.

The invention discloses a phase-locking circuit, comprising: a phase-locking part, including a voltage-controlled oscillator having a capacitor group and changing the oscillation frequency according to voltage information, and the phase-locking part locks the oscillation signal of the voltage-controlled oscillator into phase to a reference signal; and a calibration section having a voltage correction function for providing an appropriate calibration voltage to the voltage-controlled oscillator when frequency calibration is performed on the voltage-controlled oscillator; the calibration section includes a counter circuit, a first A storage circuit and a second storage circuit, a comparator circuit, a control circuit, a voltage generating circuit, and a processing circuit.

The invention provides a multi-long-code composite navigation signal phase consistency calibration method, which relates to the navigation satellite system's high precision application field. The method comprises: first, picking the pilot-frequency long-code baseband sample point data in a local composite navigation signal and a complex baseband navigation signal; performing relevant processing to the two and obtaining the relevant peak point sequence P; according to the picking length, picking the long-code baseband sample and determining the number of information bits M contained in the data code sub-channel of the navigation signal in the picking length; generating 2(M-1) possible information bit samples; carrying out frequency spreading to the picked local data long-code baseband sample and processing with the picked complex baseband navigation signal to determine the peak of each processing; solving the sample point sequence D corresponding to the biggest value of the peaks; and finally, solving the difference between D and P; and based on the sampling rate, calculating and obtaining the phase consistency of two long codes using the navigation signal pilot code as reference. With the method, it is possible to realize the precise calibration of the phase consistency of various codes of a navigation signal generator under the condition of multiple long codes.

The present application relates to a method and device for calibrating the pitch angle of a vehicle-mounted camera, electronic equipment and a vehicle. According to an embodiment, a vehicle-mounted camera pitch angle calibration method may include: using the inertial measurement unit to determine the direction of gravity; using the inertial measurement unit to track the movement of the vehicle to obtain a first trajectory corresponding to a moving distance; using the vehicle-mounted camera to track The movement of the vehicle, obtaining a second trajectory corresponding to the moving distance; determining the offset between the first trajectory and the second trajectory, so as to determine the distance between the on-board camera and the inertial measurement unit An included angle: determining the pitch angle of the on-board camera based on the gravity direction, the included angle between the on-board camera and the inertial measurement unit, and the pitch angle direction determined by the inertial measurement unit. The method of the present invention can perform real-time online calibration of the pitch angle of the vehicle-mounted camera in a fully automatic manner in combination with an inertial measurement unit without manual participation, so it can be widely used in fields such as automatic driving.

The invention relates to a method for calibrating the probe length of a REVO measuring head, and belongs to the field of precision testing technology and instruments. The method comprises the following steps that a ring gauge is fixed on a horizontally placed flat plate; the main axes of a measuring machine are moved so that the A axis of the measuring head is located in the zero position state, and the measuring ball center of the measuring head coincides with the central axis of the ring gauge; and the three main axes of the measuring machine are kept stationary, the measuring head A axis and the measuring head B axis are moved, two symmetrical points on the same section of the ring gauge are detected, data are returned according to the two detected points, and the probe length of the REVO measuring head is calibrated through projection calculation. According to the method, calibration is carried out in a state that the three main axes of the measuring machine are stationary, so thatprobe length calibration errors caused by movement errors of the three main axes of the measuring machine and probe length calibration errors caused by misalignment between the axis of the B axis ofthe REVO measuring head and the axis of the ring gauge can be avoided, high-precision calibration of the probe length of the REVO measuring head can be realized, and the method can be applied to measurement.

The invention relates to a high-accuracy depth domain stochastic simulation inversion method suitable for designing a track of a horizontal well, which comprises the following steps: firstly, selecting typical wells according to a certain proportion to carry out calibration of a synthetic record; establishing solid models for the typical wells and repeatedly carrying out calibration fine adjustment by stratigraphic correlation; generating a time domain sparse impulse wave impedance data volume and establishing a well control velocity field; carrying out time-to-depth conversion on the obtained time domain sparse impulse wave impedance data volume; and using depth domain sparse impulse wave impedance data as a restriction and ensuring all the wells to participate in the depth domain stochastic simulation inversion, so that an inversion result can be used for designing the track of the horizontal well. According to the invention, only the typical wells need to be subjected to calibration of the synthetic record; and by carrying out comparison and analysis on a logging curve and the high-accuracy solid models, carrying out fine adjustment and calibration, establishing the well control velocity field and directly utilizing absolute depth information of the wells to carry out depth domain stochastic simulation restrained inversion, a calibration error of a non-typical well is absolutely eliminated and the depth prediction accuracy of a target layer aiming at the track of the horizontal well is greatly improved.

The invention discloses a calibrating tool and method for spacing among rotary-expanding rollers. The tool comprises a mould base, an elastic part, a slide block mechanism and a lifting ruler, whereina slide block mounting hole and a lifting hole are separately formed in the two sides of the mould base; the elastic part is arranged in the corresponding slide block mounting hole; one end of the slide block mechanism is limited in the corresponding slide block mounting hole, and the other end of the slide block mechanism is positioned outside the slide block mounting hole and abuts against thecorresponding roller; the slide block mechanism comprises a variable-diameter section; the bottom end of the lifting hole communicates with the corresponding slide block mounting hole; and the liftingruler is positioned in the corresponding lifting hole, and the bottom end of the lifting ruler abuts against the variable-diameter section, and the lifting ruler is driven by the variable-diameter section to lift. According to the calibrating tool and method for spacing among rotary-expanding rollers disclosed by the invention, the slide block mechanism moves along with the roller, so that the lifting ruler lifts along with action of the slide block mechanism; and readings of the lifting ruler are observed, so that the practical position of the roller can be obtained; and the roller spacing is calibrated, so that consumption of labor power is reduced, and calibrating precision can be improved.

The invention relates to a device for testing dynamic frictional coefficients, which is applicable to the multi-axial stress condition in the shaping process of pipe expanding and belongs to the technical field of material processing. The device comprises a digital control machine tool holder, a frictional head, a hard rubber pad, a specimen fixing platform, a fixing platform support, a piezoelectric sensing platform of a three-phase dynamometer, a charge amplifier and an A / D collecting computer, wherein the frictional head is arranged under the digital control machine tool holder, testing specimens are fixed on the specimen fixing platform through the hard rubber pad, the specimen fixing platform is arranged on the fixing platform support, the lower end of the fixing platform support is provided with two swallow-tail shape surfaces which incline downward swallow-tail shape slots are arranged on the two inclined surfaces along the inclined direction, the upper portion of the fixing platform support is an upper inclined surface which is matched with the specimen fixing platform, swallow-tail shape bosses are arranged evenly on the upper inclined surface along the inclined direction, the swallow-tail shape bosses are matched with the swallow-tail shape slots, the fixing platform support is fixed on the piezoelectric sensing platform, and the piezoelectric sensing platform is connected with the A / D collecting computer through the charge amplifier. The invention has simple structure, convenient operation, high accuracy and strong versatility.