CAJ | 학술논문

雷达散射截面(RCS)测量对于太赫兹雷达系统论证设计具有重要意义。详细描述了时域光谱(TDS)系统测量RCS的原理，以及实验方案的设计。基于TDS系统对太赫兹频段圆柱RCS进行了测量实验，获得光滑和粗糙圆柱在太赫兹频段下的回波，对光滑圆柱回波进行傅里叶变换得到其宽带RCS，与理想圆柱RCS的物理光学解进行比较，发现RCS理论值与测量值基本一致，验证了TDS系统可用于太赫兹频段目标RCS的测量；同时将光滑圆柱和粗糙圆柱的RCS测量值进行对比分析，结果表明：太赫兹频率越高，粗糙面对RCS的影响越大，粗糙度大于八分之一波长为粗糙面的传统定义须重新考虑。
뢰체산사절면(RCS)측량대우태혁자뢰체계통론증설계구유중요의의。상세묘술료시역광보(TDS)계통측량RCS적원리，이급실험방안적설계。기우TDS계통대태혁자빈단원주RCS진행료측량실험，획득광활화조조원주재태혁자빈단하적회파，대광활원주회파진행부리협변환득도기관대RCS，여이상원주RCS적물리광학해진행비교，발현RCS이론치여측량치기본일치，험증료TDS계통가용우태혁자빈단목표RCS적측량；동시장광활원주화조조원주적RCS측량치진행대비분석，결과표명：태혁자빈솔월고，조조면대RCS적영향월대，조조도대우팔분지일파장위조조면적전통정의수중신고필。
Radar cross section(RCS) measurement is of great significance to terahertz(THz) radar system design. Firstly, the principle and experimental design of RCS measurement based on time-domain spectroscopy (TDS) system were introduced. Secondly, by using TDS system, the time-domain echo of smooth and rough cylinder were obtained. The measured RCS value can be given after Fourier transform. Compared the measured value with the physical optics solution of the same size cylinder, the results shows that calculation and measurement have the same result which prove the TDS system can be used to measure RCS in terahertz band. Finally, comparison of measured RCS value between the smooth and rough cylinder indicates that the higher frequency, the greater impact of rough surface on RCS in terahertz band, and the traditional definition of rough surfaces which roughness more than one eight of the wavelength is not suitable any more.