Phaseless Synthetic Aperture Radar With Efficient Sampling for Broadband Near-Field Imaging: Theory and Validation
Phaseless Synthetic Aperture Radar With Efficient Sampling for Broadband Near-Field Imaging: Theory and Validation
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DOI：
10.1109/tap.2014.2378262
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发表时间：
2015-02-01
影响因子：
5.7
通讯作者：
Las-Heras, Fernando
中科院分区：
文献类型：
--
作者：
Laviada, Jaime;Arboleya-Arboleya, Ana;Las-Heras, Fernando
本文提出了一种具有高效采样的宽带无相位合成孔径雷达（SAR）。该设计依赖于一种新颖的无相单基地元件，包括发射器和接收器。该元件与计算成本低廉的算法一起，可以检索除较低频率和较高频率处的两个小安全裕度之外的所有工作频段的单基地散射场的相位。此外，相位检索的工作与发射器/接收器位置无关。因此，可以采用传统方法来减少单站采集点的数量。因此，所提出的策略适合于实现受益于低复杂性元件数量减少的阵列或光栅扫描系统，该系统不仅受益于扫描组件成本的降低，而且受益于由于采集点数量减少而带来的显着加速。此外，与其他离轴方案相比，所提出的系统既不需要机械相移也不需要电相移，因此，它可以直接适应大量频段。通过毫米波频段的仿真和测量实例验证了系统的性能。
This paper presents a broadband and phaseless synthetic aperture radar (SAR) with efficient sampling. The design relies on a novel phaseless monostatic element comprising a transmitter and a receiver. This element, together with a computationally inexpensive algorithm, can retrieve the phase of the monostatic scattered field at all the working band except for two small safety margins at the lower and upper frequencies. Furthermore, the phase retrieval works independently of the transmitter/receiver position. Consequently, conventional approaches to reduce the number of monostatic acquisition points can be employed. Thus, the proposed strategy is suitable to implement either arrays that benefit from a reduced number of low-complexity elements or raster scan systems that benefit not only from the cost reduction of the scanning components but also from a remarkable speed-up due to the reduced number of acquisition points. Moreover, in contrast to other off-axis schemes, the proposed system does not require neither mechanical nor electrical phase shifting and, therefore, it can be directly adapted to a large number of frequency bands. The performance of the system is validated by simulation and measurement examples in the millimeter-wave band.