CAJ | 학술논문

　　逆合成孔径激光雷达(Inverse Synthetic Aperture Ladar, ISAL)对机动目标成像时，其回波信号存在距离向色散和方位向多普勒时变的问题。对于机动性满足二阶运动近似的目标，分析了其ISAL回波信号特征，该文提出一种基于 FRFT-CLEAN 的 ISAL 成像算法。该算法利用分数阶 Fourier 变换(FRactional Fourier Transform, FRFT)消除距离色散。在运动补偿后，利用FRFT并结合CLEAN技术(FRFT-CLEAN)实现对机动目标的方位成像。仿真实验证明了该方法的有效性。
　　역합성공경격광뢰체(Inverse Synthetic Aperture Ladar, ISAL)대궤동목표성상시，기회파신호존재거리향색산화방위향다보륵시변적문제。대우궤동성만족이계운동근사적목표，분석료기ISAL회파신호특정，해문제출일충기우 FRFT-CLEAN 적 ISAL 성상산법。해산법이용분수계 Fourier 변환(FRactional Fourier Transform, FRFT)소제거리색산。재운동보상후，이용FRFT병결합CLEAN기술(FRFT-CLEAN)실현대궤동목표적방위성상。방진실험증명료해방법적유효성。
When imaging maneuvering target with Inverse Synthetic Aperture Ladar (ISAL), dispersion and Doppler frequency time-variation exist in the echo signal in range and cross-range direction, respectively. For targets of which the maneuverability can be approximated as a second-order motion, the characteristics of the ISAL echo signal are analyzed, and an imaging algorithm based on FRactional Fourier Tronsform(FRFT-CLEAN) is proposed. FRFT is used for range dispersion elimination. After motion compensation, a method combining FRFT and CLEAN technique (FRFT-CLEAN) is proposed for azimuth imaging. Simulation results demonstrate the validity of this algorithm.