AIRBORNE SAR PROCESSING OF HIGHLY SQUINTED DATA USING A CHIRP SCALING APPROACH WITH INTEGRATED MOTION COMPENSATION
AIRBORNE SAR PROCESSING OF HIGHLY SQUINTED DATA USING A CHIRP SCALING APPROACH WITH INTEGRATED MOTION COMPENSATION
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DOI：
10.1109/36.312891
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发表时间：
1994-09-01
影响因子：
8.2
通讯作者：
HUANG, YH
中科院分区：
文献类型：
--
作者：
MOREIRA, A;HUANG, YH
本文提出了一种高分辨率机载SAR数据处理的新方法，该方法使用改进的线性调频缩放算法来适应运动误差的校正以及多普勒质心在距离和方位角上的变化。通过在线性调频缩放阶段引入三次相位项，可以处理以高达 30 度的斜视角度采集的数据，而不会降低脉冲响应函数。所提出的方法在计算上非常高效，因为它在不使用块处理的情况下适应多普勒质心的变化。此外，可以通过子孔径处理方位角将运动误差提取算法合并到所提出的方法中。这种新方法被称为扩展线性调频缩放（ECS），被认为是一种适用于大多数机载SAR系统高分辨率处理的通用算法。
This paper proposes a new approach for high-resolution airborne SAR data processing, which uses a modified chirp scaling algorithm to accommodate the correction of motion errors, as well as the variations of the Doppler centroid in range and azimuth. By introducing a cubic phase term in the chirp scaling phase, data acquired with a squint angle up to 30-degrees can be processed with no degradation of the impulse response function. The proposed approach is computationally very efficient, since it accommodates the variations of Doppler centroid without using block processing. Furthermore, a motion error extraction algorithm can be incorporated into the proposed approach by means of subaperture processing is azimuth. The new approach, denoted as extended chirp scaling (ECS), is considered to be a generalized algorithm suitable for the high-resolution processing of most airborne SAR systems.