基于磁异探测的侵彻引信计层方法

The traditional acceleration sensor detection method has the problems of signal oscillation aliasing, serious sticking and difficult accurately to count the layers when the penetrators penetrate multi-layer buildings. An accurate layer counting method for penetration based on the magnetic anomaly detection (MAD) is proposed. The steel bars in the buildings will influence the distribution of the surrounding geomagnetic field. When the fuze penetrates a target with the warhead, the magnetic sensor is used to detect the magnetic anomaly signal (MAS) generated by the geomagnetic field distortion around the floors, so as to complete the state identification of penetration. The magnetic field simulation models of a multi-layer reinforced concrete target and a projectile penetrating multi-layer target are established. The distribution characteristics of magnetic field around the floors and the variation law of magnetic field intensity of fuze during penetration are obtained. The effects of oblique penetration, steel bar density and projectile material on the magnetic signal changes during penetration are analyzed. It is found that there is a clear corresponding relationship between the amplitude of magnetic signal and the position of floors during penetration, and the signal characteristics are obvious. The lower relative permeability of projectile material and the higher density of steel bars in the target are more conducive to the signal processing of magnetic detection. Finally, a MAD experiment is designed and carried out in the laboratory. The experimentl results show that the MAS is clear and easy to be distinguished during penetration, and the principle is proved to be feasible.