Numerical Study on Electromagnetic Scattering Characteristics of Aircraft Typical Layout

Abstract

Electromagnetic stealth has an important impact on survivability of aircraft. The layout of the corresponding aircraft is different, and the layout of aircraft will affect the electromagnetic scattering characteristics. Four kinds of typical layouts and electromagnetic models of aircraft are established. Based on physical optics method, the RCS curves of different layout aircraft are simulated numerically, and the distribution characteristics of RCS are also analyzed. Besides, the frequency response characteristics of electromagnetic scattering are studied for conventional and special layout models of aircraft. The results show that the aircraft layout determines the distribution of RCS. In the angular domain of nose direction, the electromagnetic stealth performance of layouts A-1, A-2, B, C and D tends to be increased in oscillation, and RCS mean value dropped from 7.770 0 dBsm to -30.067 3 dBsm, the RCS mean value of layout B is -10.434 7 dBsm. And the electromagnetic stealth performance of rearward and circumferential direction of different layouts are increased in turn. The RCS mean values in rearward direction are reduced from 22.702 5 dBsm of conventional layout to -25.093 8 dBsm, and RCS mean values in circumferential direction are reduced from 7.039 1 dBsm to -15.137 3 dBsm. In high frequency region, the increase of frequency has small effect on distribution of RCS curves, but oscillation of curves is more obvious, and RCS arithmetic mean value decreases with the change of frequency.

Keywords

• layout
• electromagnetic scattering
• stealth
• aircraft
• rcs(radar cross section)