On-line Calibration and Compensation Method of Attitude Misalignment Angle Between Magnetic Measurement Signal and Projectile Coordinate System

Abstract

The invention relates to a guided transformation technology of rotating ammunition, in particular to an on-line calibration compensation method for an attitude misalignment angle between a magnetic measurement signal and a projectile body coordinate system. The invention solves the problem that the traditional calibration compensation method cannot calibrate and compensate the attitude misalignment angle between the magnetic measurement signal and the missile body coordinate system. An online calibration compensation method for the attitude misalignment angle between the magnetic measurement signal and the missile body coordinate system. The method is realized by the following steps: Step 1: Real-time acquisition of the three-axis geomagnetic field vector output by the magnetic measurement system during the ballistic flight outside the missile body signal H m ; Step 2: Estimate the roll angle γ of the projectile at any time t in the roll period T of the projectile; Step 3: Obtain the coefficient a of the fitting curve x , b x , c x , a y , b y , c y , a z , b z , c z ;Step 4: Solve the three-axis installation error angle matrix M between the coordinate system of the magnetic measurement system and the coordinate system of the missile body install ; Step 5: Obtain the three-axis geomagnetic field vector signal H under the projectile coordinate system b . The invention is suitable for the guided transformation of rotating ammunition.

Description

technical field [0001] The invention relates to a guided transformation technology of rotating ammunition, in particular to an on-line calibration compensation method for an attitude misalignment angle between a magnetic measurement signal and a projectile body coordinate system. Background technique [0002] In the guided transformation process of rotating ammunition, it is necessary to calculate the roll angle of the projectile according to the magnetic measurement signal (that is, the three-axis geomagnetic field vector signal output by the magnetic measurement system). During the calculation process, the calculation accuracy of the roll angle is not only affected by the measurement accuracy of the magnetic measurement system, but also by the attitude misalignment angle between the magnetic measurement signal and the missile coordinate system. [0003] The attitude misalignment angle between the magnetic measurement signal and the missile coordinate system comes from two ...

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Problems solved by technology

[0008] In order to solve the problem that the traditional calibration compensation method cannot calibrate and compensate the attitude misalignment angle between the magnetic measurement signal and the projectile coordinate system, the present invention provides a method for calculating the attitude misalignment angle between the magnetic measurement signal and the projectile coordinate system Online Calibration Compensation Method

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