Detection of moving humans in UHF wideband SAR

Thomas K. Sjögren; Lars M. H. Ulander; Per-Olov Frölind; Anders Gustavsson; Gunnar Stenström; Tommy Jonsson

doi:10.1117/12.2050340

13 June 2014 Detection of moving humans in UHF wideband SAR

Thomas K. Sjögren, Lars M. H. Ulander, Per-Olov Frölind, Anders Gustavsson, Gunnar Stenström, Tommy Jonsson

Proceedings Volume 9093, Algorithms for Synthetic Aperture Radar Imagery XXI; 90930M (2014) https://doi.org/10.1117/12.2050340
Event: SPIE Defense + Security, 2014, Baltimore, MD, United States

Abstract

In this paper, experimental results for UHF wideband SAR imaging of humans on an open field and inside a forest is presented. The results show ability to detect the humans and suggest possible ways to improve the results. In the experiment, single channel wideband SAR mode of the UHF UWB system LORA developed by Swedish Defence Research Agency (FOI). The wideband SAR mode used in the experiment was from 220 to 450 MHz, thus with a fractional bandwidth of 0.68. Three humans walking and one stationary were available in the scene with one of the walking humans in the forest. The signature of the human in the forest appeared on the field, due to azimuth shift from the positive range speed component. One human on the field and the one in the forest had approximately the same speed and walking direction. The signatures in the SAR image were compared as a function of integration time based on focusing using the average relative speed of these given by GPS logs. A signal processing gain was obtained for the human in forest until approximately 15 s and 35 s for the human on the field. This difference is likely explained by uneven terrain and trees in the way, causing a non-straight walking path.

Citation Download Citation

Thomas K. Sjögren, Lars M. H. Ulander, Per-Olov Frölind, Anders Gustavsson, Gunnar Stenström, and Tommy Jonsson "Detection of moving humans in UHF wideband SAR", Proc. SPIE 9093, Algorithms for Synthetic Aperture Radar Imagery XXI, 90930M (13 June 2014); https://doi.org/10.1117/12.2050340

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