外形隐身改进对坦克目标电磁散射特性的影响

外形隐身是提高武器装备生存力的重要手段,为研究其对坦克的散射影响特性,提出分析外形隐身对坦克电磁散射影响的研究方法.基于某型隐身坦克,建立了隐身、常规坦克电磁模型,计算了多频、多俯仰角的雷达散射截面(radar cross section,RCS)及其减缩值,并进行了分析.结果 说明,外形隐身技术可使散射曲线向内收敛,并大幅降低坦克模型的散射强度(尤其在前后向角域);频率增加时,隐身模型的前向60°角域RCS均值逐渐减小,而减缩值增大,最高可达26.771 3 dB;俯仰角增加时,采用外形隐身后,前向RCS均值在-22.060 3～-18.608 3 dBsm振荡,在0°俯仰角外形隐身效果最好,减缩值可达24.473 4 dB,在其他俯仰角有降低趋势;外形隐身可明显改善坦克前向和后向隐身性能,并具有较强的多频、多俯仰角隐身改进作用.

Influence of Shape Stealth Improvement on Electromagnetic Scattering Characteristics of Tanks

The shape stealth is an important means to improve survivability of weapons and equipment. In order to study the influence on scattering of tanks, the research method to analyze influence of shape stealth on electromagnetic scattering of tanks is proposed. The electromagnetic models of stealth and conventional tanks were established according to a certain type stealth tank, and RCS (Radar Cross Section) values and reduction values of multi-frequency and multi-pitch angles were calculated and analyzed. The results show that shape stealth technology can make scattering curves converge inward and greatly reduce the scattering intensity of tank models (especially in the angular domain on nose direction). And when the frequency increases, the RCS mean values of stealth model gradually decrease and reduction values increase in the angular domain of 60 degree on nose direction, with maximum value is 26.771 3 dB. When the pitch angle increases, the RCS mean values of shape stealth model in the angular domain on nose direction oscillate between -18.608 3 dBsm and -22.060 3 dBsm, and the best stealth effect appears in the pitch angle of 0 degree, where its reduction value is 24.473 4 dB, besides, the decreasing trend also occurs in other pitch angles. The shape stealth can significantly improve the stealth performance of tanks on nose and rear direction, and it also has a strong stealth improvement with multi-frequency and multi-pitch angle.