Harmonic FMCW Radar System: Passive Tag Detection and Precise Ranging Estimation

Abstract

This paper details the design and implementation of a harmonic frequency-modulated continuous-wave (FMCW) radar system, specialized in detecting harmonic tags and achieving precise range estimation. Operating within the 2.4–2.5 GHz frequency range for the forward channel and 4.8–5.0 GHz for the backward channel, this study delves into the various challenges faced during the system’s realization. These challenges include selecting appropriate components, calibrating the system, processing signals, and integrating the system components. In addition, we introduce a single-layer passive harmonic tag, developed specifically for assessing the system, and provide an in-depth theoretical analysis and simulation results. Notably, the system is characterized by its low power consumption, making it particularly suitable for short-range applications. The system’s efficacy is further validated through experimental evaluations in a real-world indoor environment across multiple tag positions. Our measurements underscore the system’s robust ranging accuracy and its ability to mitigate self-interference, showcasing its significant potential for applications in harmonic tag detection and ranging.

An Interference Mitigation Method for FMCW Radar Based on Time–Frequency Distribution and Dual-Domain Fusion Filtering

“…These applications rely on the high resolution and low probability of intercept characteristics of FMCW radar. The civilian applications of FMCW radar include meteorological observation, air traffic control, ocean monitoring, ground remote sensing, and intelligent driving [ 5 , 6 , 7 , 8 , 9 ]. In recent years, FMCW radar has been widely adopted in the emerging field of autonomous driving technology, due to its robust detection performance and good accuracy [ 10 , 11 , 12 , 13 ].…”