飞艇吊舱隐身特性研究

Research on Characteristic of Airship Gondola Stealth

吊舱的雷达散射特性决定了飞艇的隐身性能。为得到最优的设计方案,需要综合计算各种方案吊舱的雷达散射截面值。本文提出了采用多截面曲面对飞艇吊舱数字化建模的原理和通过形状因子描述吊舱脊线的方法,推导出利用物理光学法估算吊舱雷达散射截面的公式并总结了程序流程。通过典型吊舱分析了飞艇的隐身性能,结果表明:采用形状因子对吊舱的数字化描述和分析是合理的,吊舱平均雷达散射截面随形状因子增大而减小,该飞艇隐身性能与常规战斗机相当,为飞艇的总体、气动、结构和隐身等多学科优化设计奠定基础。

Stealth performance of airship is determined by radar cross characteristic of gondola. To obtain the optimal design scheme, comprehensive calculating radar cross section of gondola by various schemes is necessary. In this paper, an airship gondola digital model principle based on multi-sections surface is presented and a description of spine shape factor is given, then a derivation of evaluating radar cross section（RCS） formula using physical optics method is accomplished and the program flow chart is summarized. Finally, using characteristic models the gondolas＇ stealth is calculated and analyzed. The results show that using shape factor to digitally describe and analyze the gondola is acceptable. The shape factor tends to reduce the gondola＇s average RCS. The stealth of this airship is just the same as a conventional fighter. It can give guidance to the integral design of preliminary, aerodynamics, structure and stealth.