Description: Values of radar cross section (RCS) of 152 millimeter OF-25 shell are presented in VHF, UHF and SHF bands, for various aspect angles, and for horizontal and vertical polarization. RCS values were obtained by means of mathematical simulation, using electrodynamic numerical methods, which allow obtaining scattering characteristics of radar objects having different electric sizes. During simulations OF-25 shell was considered as perfectly conducting air object. Numerical model of its surface was created. For simulation in VHF and UHF band, when shell has resonant sizes, a numerical method based on integral equation solving was used. During calculations in SHF band, when the shell is the air object of large electric sizes, an asymptotic highfrequency method was applied. Comparative analysis of shell`s RCS in various conditions was carried out. Results show that maximum level of OF-25 shell secondary radiation is observed in case of sounding on horizontal polarization and frequencies of probing signal 0.167 and 1 Ghz which corresponded to VHF and UHF bands. Also scattering characteristics of the RP-25 and 9M22 shells having different shapes and geometric sizes are compared. It is shown that the mean RCS of the two considered shells may differ in order. At the same time, it can be noted that the main trends in the RCS change, depending on the polarization and frequency of probing signal, and also on shell`s aspect angle relative to the radar, are common for two considered shells. The obtained data show that radar sounding of shells by signals having horizontal polarization in the frequency range 1...3 Ghz has some advantages. Developed electrodynamic methods and obtained results can be used for estimating facilities of existing counter-battery radars, and also at the stage of perspective radar developing. The further development of a database of scattering characteristics of shells (rockets) of various shapes and geometrical sizes under various radar sounding conditions is also of practical interest.
Keywords: artillery shell, counter-battery radar, mathematical simulation methods, radar object, scattering characteristics