In Situ Volumetric SAR
In Situ Volumetric SAR
复制标题
原位体积 SAR
DOI：
--
复制
发表时间：
2018
影响因子：
8.2
通讯作者：
Skanda Prasad
中科院分区：
文献类型：
--
作者：
C. Barnes;Skanda Prasad
提出了适用于近距离大场景的体积合成孔径雷达(VolSAR)分析技术和成像算法。从绕射波场反演的角度来看，超宽波束和近程合成孔径雷达成像场景可以看作是原位合成孔径雷达的一种形式。介绍了一种新的惠更斯-菲涅耳处理方法，使二维和三维孔径合成的原位体积成像成为可能。这些方法支持多个独立频段的相干融合，也支持稀疏传感器群数据的空间子孔径融合。开发了一种新的信号分析工具--线性调频耦合，并将其用于时间和空间合成孔径雷达线性调频信号的表达和利用。线性调频耦合为合成孔径雷达信号分析中的时间和空间元素提供了一种物理激励和统一的工具。在时间域中，线性调频耦合提供了存在于例如线性调频波形中的时间和频率的耦合的一般公式。在空间域中，线性调频耦合描述了传感器位置和被测波数之间的耦合。对比了适合于射线层析SAR算法(即，极坐标格式算法)的线性调频耦合的公式与能够支持衍射层析SAR算法(即，Stolt格式算法)的线性调频耦合。探索了利用在位VolSAR和有限长度合成孔径实现衍射极限分辨率的方案。研究表明，VolSAR成像方法避开了限制距离-多普勒和极坐标格式方法应用和性能的近似性。
Volumetric synthetic aperture radar (VolSAR) analysis techniques and image formation algorithms suitable for short ranges and large scenes are presented. From a diffractive wave field inversion perspective, ultrawide beamwidth and near range SAR imaging scenarios can be viewed as a form of in situ SAR. Novel Huygens–Fresnel processing methods are introduced that empower in situ volumetric imaging with 2-D and 3-D aperture synthesis. These methods support coherent fusion across multiple separated frequency bands and also support spatial subaperture fusion of data from sparse sensor swarms. A novel signal analysis tool we call a chirp couplet is developed and shown to be useful in the expression and exploitation of temporal and spatial SAR chirp signals. Chirp couplets provide a physically motivated and unifying tool for both temporal and spatial elements in SAR signal analysis. In the temporal domain, chirp couplets provide a generalized formulation of the coupling of time and frequency that exists, for example, in linear frequency modulated waveforms. In the spatial domain, chirp couplets describe the coupling of sensor position and sensed wavenumber. Formulations of chirp couplets suitable for ray tomographic SAR algorithms (i.e., polar format algorithms) are contrasted with chirp couplets capable of supporting diffractive tomographic SAR algorithms (i.e., Stolt format algorithms). Scenarios in which diffraction limited resolution can be achieved with in situ VolSAR and finite length synthetic apertures are explored. VolSAR imaging methods are shown to escape the approximations that constrain the application and performance of range-Doppler and polar format methods.
DOI：
10.1121/1.395919
发表时间：
1988-04
期刊：
The Journal of the Acoustical Society of America
影响因子：
--
作者：
A. Witten;J. Tuggle;R. Waag
通讯作者：
A. Witten;J. Tuggle;R. Waag
DOI：
10.1109/tthz.2013.2271298
发表时间：
2013-09-01
影响因子：
3.2
作者：
Ding, Jinshan;Kahl, Matthias;Bolivar, Peter Haring
通讯作者：
Bolivar, Peter Haring