Novel Scaling Approach for ISAL via the Fractional Fourier Transform

2nd International Symposium on Application of Materials Science and Energy Materials

材料科学;能源学

Mo, Di^1^2 ; Wang, Ning^1^2 ; Song, Ziqi^1^2 ; Wang, Ran^1 ; Yi, Yang^1 ; Wu, Yirong^1

Institute of Electronics, Chinese Academy of Sciences, Beijing, China^1

University of Chinese Academy of Sciences, Beijing, China^2

关键词: Fractional Fourier transforms;    High resolution image;    Image entropy;    Linear relationships;    Scaling method;    Strong scatterings;    Synthetic aperture ladar;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/490/6/062013/pdf
DOI  :  10.1088/1757-899X/490/6/062013

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Inverse Synthetic Aperture LADAR (ISAL) can obtain high resolution images of remote targets. In order to measure the dimension of the target, the ISAL image must be scaled. Many existing scaling methods require isolated strong scattering centers which are not easily found in ISAL images. To solve this problem, a novel ISAL scaling method is proposed. The method estimates the Doppler frequency modulation rate of each range row by the fractional Fourier transform (FrFT) and image entropy. The linear relationship between the frequency modulation rate and the range is used to obtain an estimate of the target equivalent rotational angular velocity which is the key parameter for scaling. The outfield experimental results confirm the effectiveness of the method.