Signals of Opportunity: Enabling New Science Outside of Protected Bands

Garrison, James L.; Piepmeier, Jeffrey R.; Shah, Rashmi

doi:10.1109/iceaa.2018.8520391

Cited by 6 publications

(2 citation statements)

References 12 publications

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“…The ESA CCI SM (European Space Agency Climate Change Initiative Soil Moisture) (Dorigo et al, 2017) is an ongoing effort to provide a long time series soil moisture product from the fusion of multiple sensors (SSMI, AMSR-E, ASCAT, SMOS, SMAP). Obtaining deeper soil moisture (root zone soil moisture) information would require higher frequency radiometers like in P-Band (Garrison et al, 2018) which is not available currently. On the other hand, parsimonious water balance models (Kerr et al, 2016) and assimilation into Land Surface Models (LSM) Crow et al (2018) can provide relatively accurate estimates.…”

Section: Soil Moisturementioning

confidence: 99%

Denitrification in wetlands: A review towards a quantification at global scale

Martínez-Espinosa

Sauvage

Bitar

et al. 2021

Science of The Total Environment

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Research to understand the nitrogen cycle has been thriving. The production of reactive nitrogen by humans exceeds the removal capacity through denitrification of any natural ecosystem. The surplus of reactive nitrogen is also a significant pollutant that can shift biological diversity and distribution, promotes eutrophication in aquatic ecosystems, and affects human health. Denitrification is the microbial respiration in anoxic conditions and is the main process that removes definitively nitrates from the ecosystem by returning of reactive nitrogen (Nr) to the atmosphere as N 2 and N 2 O emissions. This process occurs in the oceans, aquatic ecosystems and temporary flooded terrestrial ecosystems. Wetlands ecosystems are rich in organic matter and they have regular anoxic soil conditions ideal for denitrification to occur. In the current paper, we provide a meta-analysis that aims at exploring how research around global nitrogen, denitrification and wetlands had evolved in the last fifty years. Back in the time, wetland ecosystems were seen as non-exploitable elements of the landscape, and now they are being integrated as providers of ecosystem services. A significant improvement of molecular biology techniques and genetic extraction have made the denitrification process fully understood allowing constructed wetlands to be more efficient and popular. Yet, large uncertainties remain concerning the dynamic quantification of the global denitrification capacity of natural wetland ecosystems. The contribution of the current investigation is to provide a way forward for reducing these uncertainties by the integration of satellite-based Earth Observation (EO) technology with parsimonious physical based models.

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Section: Soil Moisturementioning

confidence: 99%

Denitrification in wetlands: A review towards a quantification at global scale

Martínez-Espinosa

Sauvage

Bitar

et al. 2021

Science of The Total Environment

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“…SoOp [3] has been successfully used aboard offshore platforms to extract oceanography data; by receiving both direct and bounced signals from commercial satellites in geosynchronous equatorial orbit (GEO) and performing path length difference (PLD) calculations, sea surface height (SSH) was accurately measured. Previous experiments have validated SoOp as a tool for collecting oceanography data, specifically SSH.…”

Section: Introductionmentioning

confidence: 99%

Tethered Balloon-Based Experiment of Surface Water Height Using Satellite Signals of Opportunity

Lally

Chamieh

Daruwala

et al. 2020

2020 IEEE Aerospace Conference

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Signals of Opportunity (SoOp) is an area of radio science that leverages existing ambient signals from spacecraft, aircraft, and ground-based radio systems to perform radio science without spending time or resources constructing new transmission infrastructure. It has been conceptualized that SmallSats or CubeSats can perform similar SoOp missions by augmenting pre-existing spacecraft missions-specifically radio/radar missions. During the summer of 2019, studentinterns at the National Aeronautics and Space Administration's (NASA) Jet Propulsion Laboratory (JPL) under the Innovation to Flight (i2F) program tested the first airborne SoOp demo via a tethered aerostat-a valuable step towards getting a SoOp demo in orbit. The airborne SoOp demo received direct and bounced signals from multiple geosynchronous equatorial orbit (GEO) satellites by using two on-board wide-band grid antennas. One antenna was pointed at the sky at appropriate azimuth and elevation angles to receive a direct GEO signal. The other antenna was pointed at an identical azimuth angle with a mirrored elevation angle so as to receive the same GEO signal reflected from a body of water below. Both antennas were secured on adjustable mounts to allow for pointing changes and permit data collection from multiple satellites. This initial test proves the scientific and technological feasibility of doing further airborne SoOp tests, potentially on aircraft, unmanned aerial vehicles (UAV), high altitude balloons (HAB), and SmallSats or CubeSats.

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Role of Geospatial Technology for Enhancement of Field Water Use Efficiency

Senapati

Pandey

2021

Geospatial Technologies for Land and Water Resources Management

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Signals of Opportunity: Enabling New Science Outside of Protected Bands

Cited by 6 publications

References 12 publications

Denitrification in wetlands: A review towards a quantification at global scale

Denitrification in wetlands: A review towards a quantification at global scale

Tethered Balloon-Based Experiment of Surface Water Height Using Satellite Signals of Opportunity

Role of Geospatial Technology for Enhancement of Field Water Use Efficiency

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