Auto-focused imaging of a moving target using an ultra-wideband array radar

Conference paper (2015)

Authors

T. Sakamoto University of Hyogo

T Sato Kyoto University

P.J. Aubry Microwave Sensing, Signals & Systems -

Alexander Yarovoy Microwave Sensing, Signals & Systems -

Research Group

Microwave Sensing, Signals & Systems () (TU Delft)

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http://resolver.tudelft.nl/uuid:ff9929f2-1b8f-4127-a284-bee82381dc66

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Published Date

2015-1

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Microwave Sensing, Signals & Systems

Abstract

The authors have developed a target speed estimation method for an ultra-wideband radar imaging system. The method is able to generate a focused image even if the target is moving at an unknown speed during the measurement, where many other techniques produce blurred images. Our technique uses the cross-range blurriness as a metric to measure the image focusing, and select the best-focused image among many generated for various candidate speeds. The target speed is estimated by finding the minimum cross-range blurriness, and the method compensates for the estimated speed to generate a focused three-dimensional image automatically. By exploiting the fact that the head size differs relatively little among individuals, we detected the head position in a radar image, and calculated the blurriness around the region to evaluate the focuse of the image. The speed estimation method is applied to the measurement of a mannequin on a moving stage, and it is shown that the target speed is estimated with an accuracy of 5%. Application results show that the developed technique can estimate target speeds accurately, and produce an image with sufficient resolution for the intended application.