48results about How to "Eliminate Calibration Errors" patented technology

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 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.