CAJ | 학술논문

分析等离子体对电磁波的透射特性时，一般可以对等离子体鞘套进行分层处理，根据各层的媒质特性大致确定测控信号相位和幅度的变化，该方法通常只能处理空间结构分布相对简单的媒质，无法精确地分析复杂绕流流场。针对覆盖于目标的非均匀等离子体鞘套，采用色散媒质的时域有限差分方法较为准确地计算和分析了等离子体鞘套对不同频段测控信号的透射特性的影响。该方法具有计算精度高、可移植性强等优点；同时，所得到的数值分析结果对实际工程应用有一定的参考价值。
분석등리자체대전자파적투사특성시，일반가이대등리자체초투진행분층처리，근거각층적매질특성대치학정측공신호상위화폭도적변화，해방법통상지능처리공간결구분포상대간단적매질，무법정학지분석복잡요류류장。침대복개우목표적비균균등리자체초투，채용색산매질적시역유한차분방법교위준학지계산화분석료등리자체초투대불동빈단측공신호적투사특성적영향。해방법구유계산정도고、가이식성강등우점；동시，소득도적수치분석결과대실제공정응용유일정적삼고개치。
For the analysis of near-field transmission characters of the hypersonic plasma sheath, layered media treatment is often applied to simplify the problem. However, it can only deal with the media with relatively simple distributions. For complex hypersonic flow field of real applications, this treatment will bring significant errors. In this paper, a frequency-dependent finite-difference time-domain method is utilized to accurately analyze the transmission characters of heterogeneous plasma sheath. Meanwhile, based on the numerical results, the basic tendency of the transmission process is further explored, which will also be valuable for practical applications.