摘要
传统的基于FFT的ISAR成像方法不能满足大转角、非均匀旋转目标的成像要求。本文分析了在上述两种情况下,散射点回波信号多普勒的变化规律和信号模型。进一步提出了基于最小熵准则的线性调频指数的估计方法,以及对多普勒变化进行补偿后的成像方法,仿真结果表明了所提出的方法成像质量明显改善。
The classical ISAR imaging method based on FFT cannot statisfy the imaging requirements in the case of large rotating angle and nonuniformly rotating targt. The variation rule of the Doppler frequency of a target scatterers is analyzied under the two situations mentioned above. We have proposed a method for compensating this variation based on the criteria of minimum entropy for estimating the chirp rate. The experimental resuits show great improvement in ISAR imaging.
出处
《电子学报》
EI
CAS
CSCD
北大核心
1998年第6期91-93,90,共4页
Acta Electronica Sinica
基金
国家科委"863"计划
国防科技预研资助
