Reconstruction of signal phases for signals closer than the DFT frequency resolution

  • Radar signal processing is a promising tool for vital sign monitoring. For contactless observation of breathing and heart rate a precise measurement of the distance between radar antenna and the patient’s skin is required. This results in the need to detect small movements in the range of 0.5 mm and below. Such small changes in distance are hard to be measured with a limited radar bandwidth when relying on the frequency based range detection alone. In order to enhance the relative distance resolution a precise measurement of the observed signal’s phase is required. Due to radar reflections from surfaces in close proximity to the main area of interest the desired signal of the radar reflection can get superposed. For superposing signals with little separation in frequency domain the main lobes of their discrete Fourier transform (DFT) merge into a single lobe, so that their peaks cannot be differentiated. This paper evaluates a method for reconstructing the phase and amplitude of such superimposed signals.

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Author:Christian Schiffer, Andreas R. Diewald
Parent Title (English):Advances in Radio Science
Publisher:Copernicus Publications
Document Type:Article (specialist journals)
Date of OPUS upload:2022/08/30
Date of first Publication:2021/12/17
Publishing University:Hochschule Trier
Release Date:2022/09/05
GND Keyword:Radar
Page Number:6
First Page:179
Last Page:184
Departments:Institute / LaROS - Labor für Radiotechnologie und optische Systeme
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International