Dataset Information

SMAP L-Band Microwave Radiometer: Instrument Design and First Year on Orbit.

ABSTRACT: The Soil Moisture Active-Passive (SMAP) L-band microwave radiometer is a conical scanning instrument designed to measure soil moisture with 4% volumetric accuracy at 40-km spatial resolution. SMAP is NASA's first Earth Systematic Mission developed in response to its first Earth science decadal survey. Here, the design is reviewed and the results of its first year on orbit are presented. Unique features of the radiometer include a large 6-m rotating reflector, fully polarimetric radiometer receiver with internal calibration, and radio-frequency interference detection and filtering hardware. The radiometer electronics are thermally controlled to achieve good radiometric stability. Analyses of on-orbit results indicate that the electrical and thermal characteristics of the electronics and internal calibration sources are very stable and promote excellent gain stability. Radiometer NEDT < 1 K for 17-ms samples. The gain spectrum exhibits low noise at frequencies >1 MHz and 1/f noise rising at longer time scales fully captured by the internal calibration scheme. Results from sky observations and global swath imagery of all four Stokes antenna temperatures indicate that the instrument is operating as expected.

SUBMITTER: Piepmeier JR

PROVIDER: S-EPMC7357195 | biostudies-literature | 2017 Apr

REPOSITORIES: biostudies-literature

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Publications

SMAP L-Band Microwave Radiometer: Instrument Design and First Year on Orbit.

Piepmeier Jeffrey R JR Focardi Paolo P Horgan Kevin A KA Knuble Joseph J Ehsan Negar N Lucey Jared J Brambora Clifford C Brown Paula R PR Hoffman Pamela J PJ French Richard T RT Mikhaylov Rebecca L RL Kwack Eug-Yun EY Slimko Eric M EM Dawson Douglas E DE Hudson Derek D Peng Jinzheng J Mohammed Priscilla N PN De Amici Giovanni G Freedman Adam P AP Medeiros James J Sacks Fred F Estep Robert R Spencer Michael W MW Chen Curtis W CW Wheeler Kevin B KB Edelstein Wendy N WN O'Neill Peggy E PE Njoku Eni G EG

IEEE transactions on geoscience and remote sensing : a publication of the IEEE Geoscience and Remote Sensing Society 20170105 4

The Soil Moisture Active-Passive (SMAP) L-band microwave radiometer is a conical scanning instrument designed to measure soil moisture with 4% volumetric accuracy at 40-km spatial resolution. SMAP is NASA's first Earth Systematic Mission developed in response to its first Earth science decadal survey. Here, the design is reviewed and the results of its first year on orbit are presented. Unique features of the radiometer include a large 6-m rotating reflector, fully polarimetric radiometer receiv ...[more]

PMID: 32661449

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Project description:Harmful drinking among young people is common in Australia and many other countries. Social norms and their influence on adolescents' alcohol consumption behaviours have received much research attention in recent years. However, there is limited understanding of how social norms related to alcohol are developed and transmitted across social networks and a specific tool that measures these constructs has yet to be developed. This paper outlines the rationale and protocol for the design and validation of a multidimensional survey instrument which measures the development and transmission pathways of alcohol-related norms among adolescents. A longer term aim is to apply the instrument in a respondent-driven sampling study with a large adolescent cohort.Social Cognitive Theory (SCT) and relevant literature will guide the design of the online survey instrument. Feedback from a practitioner-based stakeholder committee, academic expert panel reviews, focus groups and interviews with adolescents aged 13-17 years in Perth, Western Australia (WA) will serve to ascertain content and face validity. A test-retest will be conducted using a purposive sample of students (n=400) at secondary schools in Perth. The instrument's psychometric properties will be analysed, including exploratory factor analyses, discriminant validity, internal consistency and test-retest reliability.The results of this research will provide public health researchers and practitioners with a comprehensive standardised instrument to explore the characteristics of individual-level and community-level social influences and norms associated with use of alcohol by adolescents and the routes through which these norms are transmitted. The data collected by the instrument is anticipated to inform the design of youth specific interventions with the potential to reduce alcohol-related harms. The Study findings will be disseminated widely through peer-reviewed publications and conference presentations. The study has received approval from the Curtin University Human Research Ethics Committee.

Dataset Information

SMAP L-Band Microwave Radiometer: Instrument Design and First Year on Orbit.

Publications

SMAP L-Band Microwave Radiometer: Instrument Design and First Year on Orbit.

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