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Proceedings Paper

Distortion effects in a switch array UWB radar for time-lapse imaging of human heartbeats
Author(s): Sverre Brovoll; Tor Berger; Øyvind Aardal; Tor Sverre Lande; Svein-Erik Hamran
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Paper Abstract

Cardiovascular diseases (CVD) are a major cause of deaths all over the world. Microwave radar can be an alternative sensor for heart diagnostics and monitoring in modern healthcare that aids early detection of CVD symptoms. In this paper measurements from a switch array radar system are presented. This UWB system operates below 3 GHz and does time-lapse imaging of the beating heart inside the human body. The array consists of eight fat dipole elements. With a switch system, every possible sequence of transmit/receive element pairs can be selected to build a radar image from the recordings. To make the radar waves penetrate the human tissue, the antenna array is placed in contact with the body. Removal of the direct signal leakage through the antennas and body surface are done by high-pass (HP) filtering of the data prior to image processing. To analyze the results, measurements of moving spheres in air and simulations are carried out. We see that removal of the direct signal introduces amplitude distortion in the images. In addition, the effect of small target motion between the collection times of data from the individual elements is analyzed. With low pulse repetition frequency (PRF) this motion will distort the image. By using data from real measurements of heart motion in simulations, we analyze how the PRF and the antenna geometry influence this distortions.

Paper Details

Date Published: 3 June 2014
PDF: 10 pages
Proc. SPIE 9077, Radar Sensor Technology XVIII, 90771O (3 June 2014); doi: 10.1117/12.2050302
Show Author Affiliations
Sverre Brovoll, Norwegian Defence Research Establishment (Norway)
Tor Berger, Norwegian Defence Research Establishment (Norway)
Øyvind Aardal, Forsvarets Forsknings Institute (Norway)
Tor Sverre Lande, Univ. of Oslo (Norway)
Svein-Erik Hamran, Norwegian Defence Research Establishment (Norway)
Univ. of Oslo (Norway)

Published in SPIE Proceedings Vol. 9077:
Radar Sensor Technology XVIII
Kenneth I. Ranney; Armin Doerry, Editor(s)

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