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An upgraded G-band differential absorption radar system for future airborne studies

Show simple item record Roy, Richard J. Cooper, Ken B. Lebsock, Matthew Millan, Luis Siles, Jose Dengler, Robert Monje, Raquel 2020-10-30T19:39:27Z 2020-10-30T19:39:27Z 2019-04-22
dc.identifier.citation 2019 IEEE Radar Conference (RadarCon), Boston, Massachusetts, April 22-26, 2019 en_US
dc.identifier.clearanceno 19-0298
dc.description.abstract A proof-of-concept, 170 GHz frequency-modulated, continuous-wave (FMCW) radar has been developed for measuring water vapor profiles within the cloudy boundary layer from an airborne platform. The measurement concept exploits the differential absorption accrued by two or more transmitted frequencies in the vicinity of the 183 GHz water absorption line to retrieve range-resolved humidity profiles, so-called differential absorption radar (DAR). The upgraded system design includes important considerations for monostatic radar operation with an open fuselage viewport (i.e. no radome). The radar features an all-solid-state tansmitter with > 0:4 W continuous transmit power, a 60 cm primary aperture and corresponding 58 dB antenna gain, and more than 80 dB transmit/receive isolation, enabling near thermal-noise-limited sensitivity with a 8 dB noise figure receiver. Ice-cloud radar returns are detected beyond 8 km in height from the ground, demonstrating the high sensitivity of the system. In addition to in-cloud humidity profiling capabilities, deployment of a water vapor DAR from an airborne platform enables measurements of total column water vapor (TCWV) for all weather and surface scenarios. Precision estimates and potential biases for future TCWV measurements are discussed. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA: Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2019 en_US
dc.title An upgraded G-band differential absorption radar system for future airborne studies en_US
dc.type Preprint en_US

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