Faraday rotation effects on l-band spaceborne sar data

Wright, Philip; Quegan, S.; Wheadon, N.S.; Hall, Clifton L.

doi:10.1109/tgrs.2003.815399

Cited by 139 publications

(118 citation statements)

References 14 publications

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“…Generally, FR depends on the total electron content and the magnetic field along the path and may be estimated from [5] and [7] as…”

Section: B Frmentioning

confidence: 99%

“…Finally, the parallel magnetic field was obtained at a height of 300 km from the IGRF10 model presented in Section II-A. As the strength of geomagnetic field varies slowly at ionospheric heights, a reference mean value is commonly estimated for a set reference height between 300 and 450 km [7].…”

Section: B Frmentioning

confidence: 99%

“…FR effects have been discussed at length in [1], [5], and [6]. Corrective methods were treated, e.g., in [7]. Distortion effects are laid out in [8]- [10].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Measurement of Ionospheric Faraday Rotation in Simulated and Real Spaceborne SAR Data

Jehle

Ruegg

Zuberbuhler

et al. 2009

IEEE Trans. Geosci. Remote Sensing

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“…Generally, FR depends on the total electron content and the magnetic field along the path and may be estimated from [5] and [7] as…”

Section: B Frmentioning

confidence: 99%

Section: B Frmentioning

confidence: 99%

See 1 more Smart Citation

Measurement of Ionospheric Faraday Rotation in Simulated and Real Spaceborne SAR Data

Jehle

Ruegg

Zuberbuhler

et al. 2009

IEEE Trans. Geosci. Remote Sensing

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“…Though these methods were originally developed for airborne systems, they are also applicable to satellite systems, but encounter problems at long wavelengths because of complications arising from Faraday rotation (FR). This may not be a serious issue even for frequencies as low as L-band, such as the ALOS-PALSAR system [12][13][14][15][16][17][18][19][20][21], but at P-band it becomes a serious issue [22][23][24][25][26]. Fortunately, spaceborne SAR systems are much more stable than airborne systems, and scene-by-scene updates of the system errors are unlikely to be required [26].…”

Section: Introductionmentioning

confidence: 99%

Calibration of Spaceborne Linearly Polarized Low Frequency Sar Using Polarimetric Selective Radar Calibrators

Chen¹,

Quegan²,

Yin³

2011

PIER

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Abstract-Spaceborne synthetic aperture radar (SAR) systems operating at lower frequencies, such as P-band, are significantly affected by Faraday rotation (FR) effects. This paper presents a novel algorithm for measuring system errors (channel imbalance and cross-talk) in the presence of Faraday rotation for spaceborne polarimetric SAR data. It uses four polarimetric selective calibrators (four polarimetric active radar calibrators [PARCs] or possibly two PARCs and two gridded trihedrals).Theoretical analysis and simulations demonstrate that the optimized calibration scheme puts tight constraints on the accuracy of the associated Faraday rotation if the cross-talk is to be accurately measured. There are also strong constraints on the allowable signal-to-noise ratio and average polarimetric noise associated with the calibration devices. The analysis suggests that, unless the calibration sites are at the magnetic equator, independent measurements of total electron content (TEC) from a direct ground-satellite line-of-sight dual-frequency system are also needed.

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“…Corner reflectors (CR) were deployed during the acquisitions for calibration purposes. Faraday rotation is generally low at the Amazonian forests [11], [12]. As a result, conventional Cband calibration methods that are mainly based on the VanZyl algorithm [8] can be used.…”

mentioning

confidence: 99%

Polarimetric PALSAR System Model Assessment and Calibration

Touzi

Nedelcu

Shimada

2008

IGARSS 2008 - 2008 IEEE International Geoscience and Remote Sensing Symposium

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Abstract-Polarimetric PALSAR system parameters are assessed using data sets collected over various calibration sites. The data collected over the Amazonian forest permits validating the zero Faraday rotation hypotheses near the equator. The analysis of the Amazonian forest data and the response of the corner reflectors deployed during the PALSAR acquisitions lead to the conclusion that the antenna is highly isolated (better than -35 dB). Theses results are confirmed using data collected over the Sweden and Ottawa calibration sites. The 5-m height trihedrals deployed in the Sweden calibration site by the Chalmers University of technology permits accurate measurement of antenna parameters, and detection of 2-3 degree Faraday rotation during day acquisition, whereas no Faraday rotation was noted during night acquisition. Small Faraday rotation angles (2-3 degree) have been measured using acquisitions over the DLR Oberpfaffenhofen and the Ottawa calibration sites. The presence of small but still significant Faraday rotation (2-3 degree) induces a CR return at the crosspolarization HV and VH that should not be interpreted as the actual antenna cross-talk. PALSAR antenna is highly isolated (better than -35 dB), and diagonal antenna distortion matrices (with zero cross-talk terms) can be used for accurate calibration of PALSAR polarimetric data.

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Faraday rotation effects on l-band spaceborne sar data

Cited by 139 publications

References 14 publications

Measurement of Ionospheric Faraday Rotation in Simulated and Real Spaceborne SAR Data

Measurement of Ionospheric Faraday Rotation in Simulated and Real Spaceborne SAR Data

Calibration of Spaceborne Linearly Polarized Low Frequency Sar Using Polarimetric Selective Radar Calibrators

Polarimetric PALSAR System Model Assessment and Calibration

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