On Amplitude Modulation in CW Doppler Radars for Remote Displacement Sensing Using ENVSIL Radar

IF 4.1 1区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Microwave Theory and Techniques Pub Date : 2024-10-22 DOI:10.1109/TMTT.2024.3470819

Xiaonan Jiang;Xiaohu Wu;Qun Jane Gu;Xiaoguang Liu

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引用次数: 0

Abstract

This article introduces an innovative Doppler radar system designed for remote displacement sensing: the envelope detection and self-injection-locked (ENVSIL) radar system. First, we conduct the theoretical analysis of the amplitude modulation (AM) mechanism in continuous-wave (CW) Doppler radar sensors. Our study reveals that in the presence of transmit (TX)–receive (RX) leakage, target motion can produce an effective AM of the carrier whose relative magnitude can be as large as that of the phase modulation (PM). Theoretical derivation, numerical simulation, and experimental validation are provided with excellent agreement between each other. This theoretical advancement presents new possibilities for radar receiver design employing envelope detectors. Moreover, guided by the AM theory, we develop the ENVSIL system to leverage the complementary relationship between AM and PM for IQ plot construction. The ENVSIL system exhibits notable performance, achieving a root mean square error (RMSE) of 0.66 mm for a 5-cm linear motion and an RMSE of 2.26% when measuring a 4-mm motion displacement at a distance of 2.7 m. The absence of a mixer in this architecture reduces the signal power requirement to 0 dBm, contributing to high power efficiency.

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来源期刊

IEEE Transactions on Microwave Theory and Techniques 工程技术-工程：电子与电气

CiteScore

8.60

自引率

18.60%

发文量

486

审稿时长

6 months

期刊介绍： The IEEE Transactions on Microwave Theory and Techniques focuses on that part of engineering and theory associated with microwave/millimeter-wave components, devices, circuits, and systems involving the generation, modulation, demodulation, control, transmission, and detection of microwave signals. This includes scientific, technical, and industrial, activities. Microwave theory and techniques relates to electromagnetic waves usually in the frequency region between a few MHz and a THz; other spectral regions and wave types are included within the scope of the Society whenever basic microwave theory and techniques can yield useful results. Generally, this occurs in the theory of wave propagation in structures with dimensions comparable to a wavelength, and in the related techniques for analysis and design.