CAJ | 학술논문

通过建立高速运动目标的ISAR全去斜回波模型,分析了传统DFT距离压缩处理中所存在的距离色散问题及其对成像的影响.然后针对高速目标回波是调频斜率相同的多分量LFM信号的特点,提出了基于分数阶Fourier变换的距离压缩处理方法,并讨论了最优旋转角估计的问题.最后结合GRECO软件产生的回波数据进行仿真,证明了该方法能有效解决高速运动目标距离压缩中存在的色散问题,提高ISAR成像质量.
통과건립고속운동목표적ISAR전거사회파모형,분석료전통DFT거리압축처리중소존재적거리색산문제급기대성상적영향.연후침대고속목표회파시조빈사솔상동적다분량LFM신호적특점,제출료기우분수계Fourier변환적거리압축처리방법,병토론료최우선전각고계적문제.최후결합GRECO연건산생적회파수거진행방진,증명료해방법능유효해결고속운동목표거리압축중존재적색산문제,제고ISAR성상질량.
The echo signal of a fast-moving target was established.For the fast-moving target,range　dispersion will occur in the DFT range compression,deriving from the high-speed radial motion,distort　the range profile and defocus the ISAR image.A new reconstruction algorithm was proposed,which uses　fractional Fourier transform (FRFT) instead of DFT to implement the range compression.The simulation　results indicate that this new algorithm can avoid the range dispersion and achieve refocused ISAR images　effectively.