Computation and analysis of RCS for a kinetic energy type anti armour missile at Ka band

Abstract

Radar Cross Section (RCS) computation and analysis are carried out for a high speed, kinetic energy missile at 35 GHz. The radar cross section simulations were performed under bistatic conditions, using a 3D Electromagnetic field solver. RCS values for standard geometries such as cylinder, cone – cylinder combination are calculated under different excitation conditions and the results are verified with literature, so as to fix the settings in the solver. A maximum RCS value for the missile is obtained as −4.9 dBsm under broad side excitation. RCS values of−22.25 dBsm and 4.94 dBsm are obtained for 0° (Nose cone) and 180° direction, when excited in the frontal region, i.e., 0° azimuth and 0° elevation. Further, monostatic simulation under 0° to 180° excitation shows a large RCS value of−4 dBsm at 90°, corresponding to large surface area of the missile. The effect of frequency on the RCS of the missile is also determined in 30 to 40 GHz band. A comparison of integral equation solver and asymptotic solver for RCS computation indicates almost similar values, with a deviation less than 5 dB in most of the ranges. However, with compromise on accuracy, the asymptotic solver is found to consume only 5% of the total time required by integral equation solver.