用调制信号实现高精度近场微波成像，无需主动发射
Phase-Corrected Near-Field Microwave Imaging via Inverse Source Reconstruction with Modulated Signals
- 基于反源重建技术，利用非合作发射信号成像
- 通过参考信号归一化实现空间相干性，单频求解成像
- 适用于办公环境，对窄带信号可实现无相位修正成像
提出一种基于反源重建（ISR）的三维近场（NF）被动雷达微波成像方法，利用非合作发射源的调制信号。目标散射信号由固定参考天线与近场扫描探头在不同位置捕获。通过参考信号归一化，获得近场观测的空间相干性，进而采用单频反源求解器进行反源重建与图像生成。提出相应的相位校正方法以实现多频图像相干叠加，并通过仿真验证。此外，研究表明对于真实窄带信号，非相干成像方法已足够。该技术方案在典型办公室环境中通过平面扫描系统验证，使用软件定义无线电收发窄带正交频分复用信号，工作于Wi-Fi频段。借助背景抑制与参考信号，成功获取了办公室内人体模型的成像结果。
原文摘要 · Abstract (English)
An inverse source reconstruction (ISR) based 3-D near-field (NF) passive radar microwave imaging method utilizing modulated signals is presented. The modulated signals from a non-cooperative transmitter are scattered by the targets of interest and captured by a fixed reference antenna together with an NF scanning probe at different positions. By normalizing with the reference signals, spatial coherence of the NF observations is obtained, and a single-frequency inverse source solver is subsequently utilized for ISR and image generation. A corresponding phase correction method is proposed for the coherent superposition of multi-frequency images and verified through simulations. In addition, it is shown that for realistic narrowband signals, an incoherent imaging approach is sufficient. The presented technical scheme is validated using a planar scanning system in a typical office room, where software-defined radios are employed for the transmitting and receiving of narrowband orthogonal frequency-division multiplexing signals at Wi-Fi operating frequencies. With the aid of background subtraction and reference signals, images of a mannequin placed in the office room are successfully obtained.
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