A symmetrical structure accelerometer north-seeker and dynamic differential north-finding method

Abstract

The invention discloses a symmetrical structure accelerometer north seeker and a dynamic difference north-seeking method. The north seeker comprises a servo motor, a photoelectric encoder, a rotary table, two accelerators and a conducting ring, wherein the rotary table is of a connecting rod type symmetrical structure, the two accelerators are symmetrically arranged and mounted on the rotary table, a certain offset distance exists between the two accelerators and the axis of the rotary table, the output shaft of the servo motor is fixedly connected with the rotary table, the rotary table can rotate at a constant speed under the driving of the servo motor, and the absolute acceleration of a reference point is measured by the accelerometer for azimuth angle resolving. The inertial centrifugal force generated when the accelerometer is eccentrically configured can be eliminated, and the difficulty of speed stabilizing control for the rotary table is reduced. Moreover, according to the dynamic difference north-seeking method, the influences on latitude parameter, accelerometer zero offset and positioning dimension error are eliminated through difference and proportion calculation, and the azimuth angle resolving precision can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of inertial north finding, in particular to a symmetrical structure accelerometer north finding instrument and a dynamic differential north finding method. Background technique [0002] Inertial north-seeking refers to the method of determining the true north direction of the earth by using inertial components such as gyroscopes and accelerometers. This method is not disturbed and restricted by external conditions such as terrain, landform, and climate. It has the advantages of long continuous working time and high precision of north-finding. It is of great significance to ensure the battlefield survival, rapid response, and precise strike capabilities of weapon systems in modern warfare. . However, the traditional gyro north finder has a contradiction between high precision and high efficiency, which is an urgent problem to be solved in the current inertial north finder technology. In addition, the gyro n...

AI Technical Summary

Problems solved by technology

When the turntable rotates at high speed, the eccentric structure will generate a large inertial centrifugal force, which will increase the vibration and noise of the instrument, thus increasing the difficulty of the steady speed control of the turntable, which is not conducive to improving the north-seeking accuracy

In addition, the existing north-seeking methods all use the north-seeking equation to directly calculate the azimuth angle, which cannot eliminate the influence of latitude, accelerometer zero bias and noise, which is not conducive to improving the accuracy of the azimuth angle calculation

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