Microwave Imaging Using Noise Signals
Microwave Imaging Using Noise Signals
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DOI：
10.1109/tmtt.2018.2867433
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发表时间：
2018-12-01
影响因子：
4.3
通讯作者：
Nanzer, Jeffrey A.
中科院分区：
文献类型：
--
作者：
Vakalis, Stavros;Nanzer, Jeffrey A.
提出了一种利用噪声信号和空间频率采样的主动非相干微波成像新方法。在射电天文学中开发的干涉空间频率采样阵列的基础上，主动非相干微波成像利用噪声信号的传输来实现在空间频率域中采样的第一个主动成像方法。与无源微波成像系统相比，有源非相干成像需要具有低得多的灵敏度的接收器，因此总成本更低。我们提出的理论背后的成像技术，并显示实验结果从5.85 GHz的系统成像在一个和两个维度。对于1-D图像，发射器由两个噪声发生器组成，而接收阵列是一个合成的线性阵列，其元件以1 λ为增量放置，最宽间距为15 λ。对于2-D图像，发射器由三个噪声发生器组成，而接收阵列是一个合成的T阵列，其元素以0.5 λ增量放置。我们演示了重建的1-D和2-D场景组成的球形反射目标，仅使用25 MHz的信号带宽和10 μ s的集成时间，这两者都是一个数量级小于被动微波和毫米波成像系统。
A new method of active incoherent microwave imaging is presented that uses noise signals and spatial frequency sampling. Building on interferometric spatial frequency sampling arrays developed in radio astronomy, active incoherent microwave imaging utilizes the transmission of noise signals to implement the first active imaging method that samples in the spatial frequency domain. In comparison to passive microwave imaging systems, active incoherent imaging requires receivers with far less sensitivity, and thus less overall cost. We present the theory behind the imaging technique and show experimental results from a 5.85-GHz system imaging in one and two dimensions. For 1-D images, the transmitter consisted of two noise generators, while the receive array was a synthesized linear array with elements placed in 1 lambda increments with the widest spacing of 15 lambda. For 2-D images, the transmitter consisted of three noise generators, while the receive array was a synthesized T-array with elements placed in 0.5 lambda increments. We demonstrate the reconstruction of 1-D and 2-D scenes consisting of spherical reflecting targets, using only 25 MHz of signal bandwidth and 10 mu s of integration time, both of which are an order of magnitude less than passive microwave and millimeter-wave imaging systems.