Characterization of RF front-ends by long-tail pulse response

Gregory J. Mazzaro; Kenneth I. Ranney

doi:10.1117/12.862696

27 April 2010 Characterization of RF front-ends by long-tail pulse response

Proceedings Volume 7669, Radar Sensor Technology XIV; 76690X (2010) https://doi.org/10.1117/12.862696
Event: SPIE Defense, Security, and Sensing, 2010, Orlando, Florida, United States

Abstract

The recognition of unauthorized communications devices at the entry-point of a secure location is one way to guard against the compromise of sensitive information by wireless transmission. Such recognition may be achieved by backscatter x-ray and millimeter-wave imaging; however, implementation of these systems is expensive, and the ability to image the contours of the human body has raised privacy concerns. In this paper, we present a cheaper and less-invasive radio-frequency (RF) alternative for recognizing wireless communications devices. Characterization of the device-under-test (DUT) is accomplished using a stepped-frequency radar waveform. Single-frequency pulses excite resonance in the device's RF front-end. Microsecond periods of zero-signal are placed between each frequency transition to listen for the resonance. The stepped-frequency transmission is swept through known communications bands. Reception of a long-tail decay response between active pulses indicates the presence of a narrowband filter and implies the presence of a front-end circuit. The frequency of the received resonance identifies its communications band. In this work, cellular-band and handheld-radio filters are characterized.

Citation Download Citation

Gregory J. Mazzaro and Kenneth I. Ranney "Characterization of RF front-ends by long-tail pulse response", Proc. SPIE 7669, Radar Sensor Technology XIV, 76690X (27 April 2010); https://doi.org/10.1117/12.862696

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