Rotating projectile rotation speed measurement error compensation method based on geomagnetic information

Abstract

The invention discloses a rotating projectile rotation speed measurement error compensation method based on geomagnetic information, so that rotating projectile rotation speed extraction precision can be improved. The method is characterized by, to begin with, installing a uniaxial magneto-resistive sensor in a projectile, wherein the sensitive axis of the uniaxial magneto-resistive sensor is vertical to the longitudinal symmetric axis of the projectile; installing a GPS antenna array conformal with the cone surface of a bullet head in the head portion of the projectile; then, selecting a measurement window, and extracting frequency of a projection signal F(t) of the uniaxial magneto-resistive sensor on the sensitive axis thereof in the measurement window, wherein the frequency serves as the projectile rotation speed at the central time ts in the measurement window; then, calculating rotation speed measurement error compensation value [delta]f(ts) of the projectile at the central time ts; and finally, carrying out error compensation on the rotation speed of the projectile at the time ts by utilizing the error compensation value [delta]f(ts) to obtain actual rotation speed of the projectile at the ts moment.

Description

technical field [0001] The invention relates to the technical field of shell guidance, in particular to a method for compensating errors in rotational speed measurement of rotating shells based on geomagnetic information. Background technique [0002] Conventional shell guidance can significantly improve the strike accuracy and overall combat effectiveness of shells, making it more suitable for future information warfare. Accurate measurement of the shell's rotational speed is the basis for precise guidance and control, and it is also a difficult problem at present. Magnetoresistive sensors can be used to measure the rotational speed of shells, especially in high dynamic shooting environments such as high rotation and high overload. The principle of rotating shell speed measurement based on geomagnetic information is based on the fact that when the shell rotates at high speed, the frequency of the projected signal of the local geomagnetic field vector on the sensitive axis ...

AI Technical Summary

Problems solved by technology

At this time, due to the relatively low rotational speed, the frequency of the output signal of the magnetic resistance sensor in the radial direction of the projectile is not completely approximately equal to the rotational speed of the projectile, and there is an error between the two

If the traditional speed measurement method is used and the influence of this error is ignored, the error of the shell speed measured by the magnetoresistive sensor will be large

At present, there is still a lack of in-depth and detailed research on the error compensation of magnetic rotational speed in related fields.

Images