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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >An Accurate Two-Step ISAR Cross-Range Scaling Method for Earth-Orbit Target
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An Accurate Two-Step ISAR Cross-Range Scaling Method for Earth-Orbit Target

机译：精确的两步ISAR跨距缩放方法

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摘要

Inverse synthetic aperture radar (ISAR) cross-range scaling is used to obtain the actual cross-range size of the target, which is essential for space surveillance and automatic target recognition. In this letter, a novel two-step ISAR cross-range scaling method for earth-orbit targets is proposed, which improves the computational efficiency through the use of prior information and achieves high estimation accuracy. An initial rotation velocity (RV) is calculated first using the open two-line element data of the satellite orbit to coarsely achieve a cross-range scaling of the ISAR image with high efficiency. Then, the refined cross-range scaling result is obtained with an accurate RV, which is accomplished by the isolated scatterer extraction and the chirp-rate estimation, wherein the blob detection and the integrated cubic phase function are employed, respectively. The initial RV is used to narrow the search width of the chirp-rate estimation, and the corresponding computational burden is expected to decrease accordingly. Finally, simulations and real-data experiments are performed to verify the effectiveness and the accuracy of the proposed method.
机译：反向合成孔径雷达（ISAR）跨范围缩放用于获取目标的实际跨范围大小，这对于空间监视和自动目标识别至关重要。在这封信中，提出了一种新颖的针对地球轨道目标的两步ISAR跨范围缩放方法，该方法通过使用先验信息提高了计算效率，并获得了很高的估计精度。首先使用卫星轨道的开放两线元素数据计算初始转速（RV），以高效地粗略实现ISAR图像的跨范围缩放。然后，通过精确的RV获得精确的跨范围缩放结果，这可以通过隔离散射体提取和线性调频率估计来实现，其中分别采用了斑点检测和积分三次相函数。初始RV用于缩小线性调频率估计的搜索宽度，并且预期相应的计算负担会相应减少。最后，通过仿真和真实数据实验验证了所提方法的有效性和准确性。

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