8results about How to "High orientation accuracy" patented technology

The invention relates to the technical field of semiconductor processing, and provides a directional cutting method and equipment for a single crystal ingot. The method comprises the steps that an X-ray transmitting tube and an X-ray receiver on an orientation assembly are adjusted according to a reference wafer of a standard crystal orientation, the adjusted orientation assembly is obtained, and according to the adjusted orientation assembly, the horizontal angle and the vertical angle of a to-be-cut crystal ingot are adjusted through a crystal loading platform so that the tangent plane of the to-be-cut crystal ingot can be matched with the cutting plane; the adjusted to-be-cut crystal ingot is cut, a cut wafer is obtained, the crystal orientation of the cut wafer is measured, the angle deviation between the horizontal direction and the vertical direction of the cut wafer is obtained, and the compensation value of the cutting equipment is calculated based on the angle deviation; the compensation value is used for conducting angle compensation on the crystal loading platform deck, a new to-be-cut crystal ingot is cut, a wafer conforming to the target crystal orientation is obtained, and the cutting equipment comprises an orientation assembly and the crystal loading platform deck. The problem that in the prior art, the wafer cutting precision is not high enough is solved.

The invention discloses a polarization / hypersensitivity / inertial navigation tight combination modeling and adaptive fusion method, and belongs to the technical field of bionic polarization integrated navigation. According to the method, polarized light intensity measured by a polarization sensor and sun image coordinates measured by a solar sensor are used as measurement and are subjected to tight combination modeling with an inertial measurement unit, and an expansion state equation including incident light intensity and degree of polarization and a nonlinear measurement equation are established. A self-adaptive fusion strategy is designed based on a dual credibility discrimination function of a polarization degree and a distance between a sun image coordinate and a sun-sensitive principal point coordinate, and a measurement mode of a polarization sensor, a sun-sensitive sensor or a combination of the polarization sensor and the sun-sensitive principal point is dynamically selected. And estimating a state quantity in real time through unscented Kalman filtering, and correcting a navigation error. The original light intensity information measured by the polarization sensor and the original sun image coordinate information measured by the solar sensor are directly used for measurement, so that the nonlinear transfer effect is inhibited. According to the invention, the orientation precision and environmental adaptability of the integrated navigation system in a complex environment are improved.

This application relates to the field of fiber optic towed sonar arrays, specifically disclosing a fiber optic towed linear array, comprising: a watertight optical cable, a transmission optical fiber, a multi-core optical fiber, multiple hydrophone probes, a sleeve, and a first watertight connector. The first watertight connector is installed in conjunction with the sleeve, and a watertight optical cable is disposed within the first watertight connector. The watertight optical cable branches into a transmission optical fiber and a multi-core optical fiber on the side near the sleeve. The transmission optical fiber is connected to the hydrophone probe, and the multi-core optical fiber is spirally wound around the outer periphery of the hydrophone probe and housed within the sleeve. The solution provided in this application overcomes the shortcomings of existing all-fiber towed linear arrays, which have many optical devices and can only measure attitude information at points, realizing distributed measurement of the towed array attitude and improving reliability.

The application relates to a Zhejiang fritillary bulb directional delivery equipment based on multi-stage directional screening, and belongs to the technical field of traditional Chinese medicinal material processing equipment. In view of the problems of low artificial screening efficiency and difficulty in accurate orientation before Zhejiang fritillary bulb slicing, the equipment comprises a feeding system, a multi-stage directional screening mechanism and an accurate directional delivery mechanism. The feeding system realizes orderly material conveying through a roller feeding mechanism; the multi-stage directional screening mechanism synchronously completes size grading and preliminary directional orientation of the material through horizontal and vertical composite vibration; the accurate directional delivery mechanism is provided with directional delivery channels of multiple sizes, the inner wall of the channel is designed in a segmented variable friction mode, the roller speed and vibration frequency are dynamically adjusted in combination with a closed-loop control system, and a posture fine adjustment mechanism is matched, so that accurate directional output of the Zhejiang fritillary bulb with the flat end facing forward is finally realized. The application is fully automated and is mainly used for automatic pretreatment of Zhejiang fritillary bulb and other flat traditional Chinese medicinal materials before slicing.

The present invention relates to a tunnel boring machine control method based on BIM deep planning, which includes establishing a three-dimensional tunnel model according to geological data; collecting working conditions and mechanical parameters through actual operation; determining the contour of the working face through a laser locator, and generating measurement control elements in combination with the three-dimensional tunnel model; forming a BIM virtual tunnel face scene based on tunnel structure information, working conditions, mechanical parameters and measurement control elements; simulating the entire mechanical excavation operation construction process of a cycle section of the tunnel by using BIM technology, and judging the feasibility of intelligent instruction parameters and decision-making; conducting on-site control excavation construction tests, and judging the feasibility of intelligent control parameters and intelligent decision-making instructions again in dynamic on-site operations, adjusting parameters and improving the accuracy of simulation operations; simulating the mechanical excavation operation construction of the next cycle section of the tunnel by using BIM technology according to the optimized control instructions; and optimizing during implementation until the entire tunnel construction process is completed.

The invention discloses a polarization compass orientation method based on real-time discriminant analysis of interpretable course information, which comprises the steps of course data modeling, real-time monitoring, discriminant analysis and noise suppression, modeling by adopting a sparse local Fisher discriminant analysis method, enabling different types of course data states to be more separated according to an inter-class dispersion matrix of a weight coefficient matrix, and improving the orientation accuracy. Similar and same course data states are more clustered by using an intra-class matrix; a minimum absolute contraction selection operator optimization model is introduced, so that a course data discrimination model is simpler and more interpretable; course process data are analyzed through monitoring indexes, so that evolution and instability of dynamic output data of the polarization compass can be monitored in real time, and fine description of the data process can be realized; noise of discriminant analysis is effectively suppressed while real course signals in dynamic course data output by the polarization compass are reserved to the maximum extent. The method solves the problem that the orientation precision of the polarization compass is affected due to weak machine learning generalization ability.

The invention discloses a multi-position north seeking method of a north seeker, which comprises the following steps of: calibrating an Allan variance curve of a gyroscope, and determining a characteristic time constant corresponding to each noise type; controlling the north seeker to sequentially rotate to a plurality of preset positions, identifying a dominant noise type in real time at each position through power spectral density analysis, and dynamically adjusting a sampling or signal processing strategy; meanwhile, acquiring internal multi-point temperature information to calculate a temperature gradient, and compensating zero offset of the gyroscope in real time by using a compensation model containing the temperature gradient; and finally, calculating the northbound angle based on the sampling data of all positions and the compensation result. According to the method, through adaptive noise suppression and multivariable temperature compensation, north-seeking precision and temperature adaptability in a complex environment are remarkably improved, and measurement efficiency and system stability are both considered by means of an optimization algorithm.

The invention provides a bionic polarized light compass and micro-inertia assisted triaxial magnetometer calibration method and device, and the method comprises the steps: employing course angle information provided by a bionic polarized light compass to assist a micro-inertia sensor to complete initial alignment, and achieving the quick obtaining of an initial attitude matrix; a horizontal attitude angle is calculated by attitude change and acceleration obtained by the micro inertial sensor finishing initial alignment, horizontal attitude information is provided for the bionic polarized light compass and the three-axis magnetometer, and normal use of the bionic polarized light compass and the three-axis magnetometer under an inclined condition can be ensured. And establishing a polarized light course assisted triaxial magnetometer calibration model, determining a compensation coefficient according to the polarized light course and a measured value of the triaxial magnetometer, and performing error compensation to realize calibration of the triaxial magnetometer. Under the condition that ellipse calibration is not carried out, geomagnetic course calibration can still be realized, so that the applicability of the integrated navigation system in different application environments is improved.