A 94GHz dual mode imager combining FMCW radar and passive radiometry for remote sensing

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We present the development and field testing results of a dual-mode radar/radiometric imager operating at 94GHz. The principal application for which the instrument was designed is to survey volcanic lava domes, producing topographic and thermal maps of the domes irrespective of weather conditions - it has been named AVTIS for All-weather Volcano Topography Imaging Sensor. AVTIS combines a 200mW FMCW radar with a total power radiometer in a compact, portable unit which is designed for ground based deployment. The radar and radiometric measurements share a common antenna and local oscillator, switching between modes on each repeated line scan. The radar has a fundamental range resolution of 1m and a maximum range of 7km. The radiometer employs a two stage calibration process, using internal noise-injection to calibrate gain fluctuations in the IF and external reference to the atmospheric brightness temperature elevation profile to calibrate the mixer and RF front end of the instrument. We present results obtained with AVTIS from our field trip to the Arenal volcano, Costa Rica in April of 2005.

Original languageEnglish
Title of host publicationProceedings International Radar Symposium
PublisherIEEE Computer Society
Publication statusPublished - 2005
EventInternational Radar Symposium, IRS 2005 - Berlin, Germany
Duration: 6 Sept 20058 Sept 2005


ConferenceInternational Radar Symposium, IRS 2005


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