Evaluation of an inflatable antenna concept for microwave sensing of soil moisture and ocean salinity

Njoku, E. G.; Rahmat‐Samii, Y.; Sercel, Joel C.; Wilson, William J.; Moghaddam, Mahta

doi:10.1109/36.739121

Cited by 35 publications

(10 citation statements)

References 33 publications

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“…A number of experiments using both ground-based and airborne sensors have shown the high potential of microwave radiometry for monitoring surface soil moisture (Calvet, Wigneron, Chanzy, & Haboudane, 1995;Chanzy et al, 1997;Jackson, Le Vine, Swift, Schmugge, & Schiebe, 1995;Schmugge & Jackson, 1994), particularly at L-band. To date, there is no spaceborne sensor measuring the microwave emission of the soil surface at this frequency, although several new programs are scheduled: the National Aeronautics and Space Administration's projects (see Njoku, Rahmat-Samii, Sercel, Wilson, & Moghaddam, 1999, for instance) and the European Space Agency's SMOS mission . The main objective of the Soil Moisture and Ocean Salinity (SMOS) mission is to deliver important variables for the land surfaces: soil moisture and for ocean surfaces: sea surface salinity fields.…”

Section: Introductionmentioning

confidence: 99%

Retrieving surface soil moisture over a wheat field: Comparison of different methods

Pardé¹,

Wigneron²,

Chanzy³

et al. 2003

Remote Sensing of Environment

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Section: Introductionmentioning

confidence: 99%

Retrieving surface soil moisture over a wheat field: Comparison of different methods

Pardé¹,

Wigneron²,

Chanzy³

et al. 2003

Remote Sensing of Environment

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“…In the microwave range, where the losses are negligible, an improvement of metal reflector performance can be achieved by making its rim transparent, absorptive, or serrated [2][3][4] . More recently the weight restrictions imposed on flight-mission antennas have led to development of inflatable microwave reflectors made of thin metallized films [5]. Therefore the scattering and beam forming by a thin penetrable reflector made of dielectric or thinner-than-skin-depth metal is an interesting research problem having important applications in optical and microwave imaging systems and antennas.…”

Section: Introductionmentioning

confidence: 99%

Integral equation analysis of an arbitrary-profile and varying-resistivity cylindrical reflector illuminated by an E-polarized complex-source-point beam

2009

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A two-dimensional reflector with resistive-type boundary conditions and varying resistivity is considered. The incident wave is a beam emitted by a complex-source-point feed simulating an aperture source. The problem is formulated as an electromagnetic time-harmonic boundary value problem and cast into the electric field integral equation form. This is a Fredholm second kind equation that can be solved numerically in several ways. We develop a Galerkin projection scheme with entire-domain expansion functions defined on an auxiliary circle and demonstrate its advantage over a conventional moment-method solution in terms of faster convergence. Hence, larger reflectors can be computed with a higher accuracy. The results presented relate to the elliptic, parabolic, and hyperbolic profile reflectors fed by in-focus feeds. They demonstrate that a partially or fully resistive parabolic reflector is able to form a sharp main beam of the far-field pattern in the forward half-space; however, partial transparency leads to a drop in the overall directivity of emission due to the leakage of the field to the shadow half-space. This can be avoided if only small parts of the reflector near the edges are made resistive, with resisitivity increasing to the edge.

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“…E.g., can we find an orbit and FOV combination that meets the revisit and coverage requirements? sensing scientists to come up with a broad list of alternative concepts [5][6][7][8][9][10][11][12]. We then developed high-level designs for each concept, which basically consisted of orbit parameters and antenna size.…”

Section: Potential Configurationsmentioning

confidence: 99%

An architecture trade study for passive 10-km soil moisture measurements from low-Earth orbit

Pellerano

O'Neill²,

Dod³

IGARSS 2001. Scanning the Present and Resolving the Future. Proceedings. IEEE 2001 International Geoscience and Remote Sensing

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In 1999 NASA HQ, as a result of an internal NASA study on potential Earth Science Enterprise Post-2002 Missions, directed the hydrology community to focus on achieving a 10km spatial resolution global soil moisture mission. This type of resolution represents a significant technological challenge for an L-band radiometer in sun-synchronous low-earth orbit. An engineering trade study has been completed to determine alternative system configurations that could achieve the science requirements and to identify the most appropriate technology investments and development path for NASA to pursue in order to bring about such a mission. The results of the study are presented here together with a short discussion of future efforts.

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Evaluation of an inflatable antenna concept for microwave sensing of soil moisture and ocean salinity

Cited by 35 publications

References 33 publications

Retrieving surface soil moisture over a wheat field: Comparison of different methods

Retrieving surface soil moisture over a wheat field: Comparison of different methods

Integral equation analysis of an arbitrary-profile and varying-resistivity cylindrical reflector illuminated by an E-polarized complex-source-point beam

An architecture trade study for passive 10-km soil moisture measurements from low-Earth orbit

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