4results about How to "High orientation accuracy" patented technology

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 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.