Cha Kyuho, Oh Sooyoung, Hong Hayoung, Park Hongsoo, Hong Sun K
School of Electronic Engineering, Soongsil University, Dongjak-gu, Seoul 06978, Korea.
Sensors (Basel). 2022 Aug 15;22(16):6086. doi: 10.3390/s22166086.
Nonlinear radars can be utilized to detect electronic devices, which are difficult to detect with conventional radars due to their small radar cross sections (RCS). Since the receiver in a nonlinear radar is designed to only receive harmonic or intermodulated echoes from electronic devices, it is able to separate electronic devices from non-electronic scatters (clutter) by rejecting their echoes at fundamental frequencies. This paper presents a harmonic-based nonlinear radar scheme utilizing frequency-modulated continuous-wave (FMCW) signals for the detection of various electronic devices at short range. Using a laboratory experiment setup for FMCW radar at S-band for Tx (C-band for Rx), measurements are carried out to detect electronic devices of various sizes. The results show that the detection of small electronic devices is possible with nonlinear FMCW radar when appropriate system parameters are selected. Furthermore, we also discuss the maximum detectable range estimation for electronic targets using the radar range equation for FMCW nonlinear radar.
非线性雷达可用于探测电子设备，这些电子设备由于其小雷达散射截面（RCS）而难以被传统雷达探测到。由于非线性雷达中的接收器设计为仅接收来自电子设备的谐波或互调回波，因此它能够通过抑制来自非电子散射体（杂波）的基频回波来将电子设备与非电子散射体区分开来。本文提出了一种基于谐波的非线性雷达方案，该方案利用调频连续波（FMCW）信号在短距离内探测各种电子设备。使用用于S波段发射（C波段接收）的FMCW雷达的实验室实验装置，进行测量以探测各种尺寸的电子设备。结果表明，当选择合适的系统参数时，非线性FMCW雷达能够探测到小型电子设备。此外，我们还使用FMCW非线性雷达的雷达距离方程讨论了电子目标的最大可探测距离估计。
