Extraction method of projectile nutation angle based on radar Doppler data

Abstract

The invention relates to a projectile nutation angle extraction method based on radar Doppler data. The method is characterized by comprising the following specific steps of arranging a radar tail chasing distributed station at the side rear part of an artillery or a rocket artillery, carrying out tracking measurement on a flying artillery shell or a rocket artillery shell, and estimating the radial velocity of a centroid; calculating micro motion speeds; extracting a precession period; resolving a velocity vector; calculating the nutation angle of a projectile. According to the method, the difficult problem in nutation angle measurement of the flying projectile under the conditions of long distance is solved effectively, and the motion of the rotating projectile in the air includes micro motions relative to the centroid, such as precession and nutation, besides centroid motion; radar signals are subjected to periodic modulation, namely micro-Doppler effect, by the micro motions. Internal data of the radial velocity obtained through radar measurement contain information on the micro motions, such as nutation, a nutation angle curve of the projectile can be obtained through processing the internal data, and the nutation angle of the projectile is obtained through an established micro-motion velocity equation.

Description

technical field [0001] The invention relates to a method for extracting the nutation angle of a projectile based on radar Doppler data, that is, using radar to measure the nutation angle of flying shells and rockets, and belongs to the field of measurement technology. Background technique [0002] At present, there are mainly methods for measuring the nutation angle of projectiles at home and abroad, such as paper targets, optics, and sensor remote measurement. The advantages of the paper target method are low cost and simple method. The disadvantage is that it is only suitable for low-elongation ballistics and is often used in conditions of limited test funds. The slit photogrammetry and optical methods are characterized by high test accuracy, but the implementation process is complex, easily restricted by meteorological conditions, and the amount of equipment and investment costs are very large. Although the telemetry method can obtain attitude data with a longer ballisti...

AI Technical Summary

Problems solved by technology

The advantages of the paper target method are low cost and simple method. The disadvantage is that it is only suitable for low-elongation ballistics and is often used in conditions of limited test funds.

The disadvantage is that there may not be a unique solution

Moreover, many radars do not have the RCS measurement function. Even if they have the RCS measurement function, the accuracy is limited, which limits the promotion of this method.

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