Imaging With WiFi
Imaging With WiFi
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DOI：
10.1109/access.2019.2902315
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发表时间：
2019-01-01
期刊：
影响因子：
3.9
通讯作者：
Nanzer, Jeffrey A.
中科院分区：
文献类型：
--
作者：
Vakalis, Stavros;Gong, Liang;Nanzer, Jeffrey A.
提出了一种通过捕获一小组无线WiFi发射机发出的信号来创建微波图像的新方法。成像技术利用了这样一个事实，即独立的WiFi发射器发出的信号在统计上是足够独立的，从而产生空间上不相干的辐射模式，从而可以使用稀疏阵列中的一小组接收天线进行空间频率采样。与传统的微波成像相比，这种方法不需要机械或电子束扫描，也不需要发射器和接收器之间的协调。此外，与无源微波成像仪相比，WiFi成像系统需要的接收器增益要小得多，带宽也要少得多。我们实验演示了反射金属球体和x形反射目标的二维图像重建，使用三个发射器发射独立的16级正交调幅信号，频率为5.5 GHz，匹配商用WiFi协议802.11n/ac。
A new method of creating microwave imagery by capturing the signals emitted by a small set of wireless WiFi transmitters is presented. The imaging technique leverages the fact that the signals emitted by separate WiFi transmitters are sufficiently statistically independent to create a radiation pattern that is spatially incoherent, enabling the use of spatial frequency sampling using a small set of receiving antennas in a sparse array. In contrast to traditional microwave imaging, this method requires no mechanical or electrical beam scanning and no coordination between transmitters and receivers. Furthermore, the WiFi imaging system requires far less receiver gain than passive microwave imagers and significantly less bandwidth. We experimentally demonstrate the 2-D image reconstruction of reflecting metal spheres and an X-shaped reflecting target using three transmitters emitting independent 16-level quadrature amplitude modulated signals at 5.5 GHz matching commercial WiFi protocols 802.11n/ac.