Phase calibration of polarimetric radar images

Sheen, D.R.; Freeman, A.; Kasischke, Eric S.

doi:10.1109/36.35960

Cited by 54 publications

(11 citation statements)

References 10 publications

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“…approximation [Nghiem, 1991]. These zero-scattering coefficients have been assumed to extract equations relating true and measured quantities for use in the calibration of polarimetric scattering data [Yueh et al, 1991;van Zyl, 1990;Sheen et al, 1989] and to study the unpolarized component of the scattering from a forested area [Durden et al, fields of physics [Hamermesh, 1972]. The symmetry of a body is described by a set of transformations which preserve distances.…”

mentioning

confidence: 99%

Symmetry properties in polarimetric remote sensing

Nghiem

Yueh²,

Kwok³

et al. 1992

Radio Science

209

127

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This paper presents the relations among polarimetric backscattering coefficients from the viewpoint of symmetry groups. Symmetry of geophysical media encountered in remote sensing due to reflection, rotation, azimuthal, and centrical symmetry groups is considered for both reciprocal and nonreciprocal cases. On the basis of the invariance under symmetry transformations in the linear polarization basis, the scattering coefficients are related by a set of equations which restrict the number of independent parameters in the polarimetric covariance matrix. The properties derived under these transformations are general and apply to all scattering mechanisms in a given symmetrical configuration. The scattering coefficients calculated from theoretical models for layer random media and rough surfaces are shown to obey the derived symmetry relations. Use of symmetry properties in remote sensing of structural and environmental responses of scattering media is discussed. As a practical application, the results from this paper provide new methods for the external calibration of polarimetric radars without the deployment of man-made calibration targets.

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confidence: 99%

Symmetry properties in polarimetric remote sensing

Nghiem

Yueh²,

Kwok³

et al. 1992

Radio Science

209

127

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“…Our future work will focus on the full development of crosstalk and channel imbalance calibration by combining the helix and DEM POA properties. Table 4 The nominal system accuracy of some of the usual SAR sensors, including SIR-C (Van Zyl, 1990), ALOS (Shimada et al, 2009), RS-2 (RadarSat-2) (Touzi et al, 2013), TRS-X (TerraSAR-X) (Gimeno Martinez et al, 2012), AIRSAR (Sheen et al, 1989;Van Zyl, 1990), CETC38 (Li et al, 2011), and UAVSAR (Scott et al, 2008). …”

Section: Resultsmentioning

confidence: 99%

“…In the early days, Freeman et al (Sheen et al, 1989) tried to solve all of the PDM components by the use of several trihedral and dihedral reflectors. To reduce the cost of deploying corner reflectors (CR), the radar and target reciprocal assumption and the reflection symmetrical property of natural targets were introduced to recover the crosstalk elements (Van Zyl, 1990) with Jet Propulsion Laboratory (JPL) airborne SAR (AIRSAR) data.…”

Section: Introductionmentioning

confidence: 99%

“…The polarimetric radar transmits the horizontal/vertical (H/V) polarization wave and receives the H/V backscattering wave to produce a 2 Â 2 polarimetric scattering matrix. However, the measurement scattering matrix is always influenced by the transmission and reception polarimetric distortion matrices (PDMs) of the radar systems (Sheen et al, 1989). For the quantitative application of PolSAR data, it is critical to recover the observed PolSAR data by rolling back to the non-distorted measurement, which is termed polarimetric calibration (PolCAL).…”

Section: Introductionmentioning

confidence: 99%

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Co-polarization channel imbalance determination by the use of bare soil

Shi¹,

Li²

2014

ISPRS Journal of Photogrammetry and Remote Sensing

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“…2) The effects of errors in the platform altitude estimation on both removal of the antenna patterns and the estimation of the scattering area A as given in (2).…”

Section: Problem Statementmentioning

confidence: 99%

Effect of topography on SAR calibration

Zyl

Shi

1993

SPIE Proceedings

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During normal SAR processing, a flat earth is assumed when performing radiometric corrections such as antenna pattern and scattering element size removal. Here we examine the effects of topographic variations on these corrections. Local slopes will cause the actual scattering element size to be different from that calculated using the flat earth assumption. It is shown that this effect, which is present for both airborne and spaceborne SAR data, may easily cause calibration errors on the order of a dB. In the case of airborne systems, the errors introduced by assuming a flat earth during antenna pattern removal are also significant; errors of several dB can easily result. The effect of topography on antenna pattern removal is expected to be negligible for spaceborne SARS.

show abstract

Phase calibration of polarimetric radar images

Cited by 54 publications

References 10 publications

Symmetry properties in polarimetric remote sensing

Symmetry properties in polarimetric remote sensing

Co-polarization channel imbalance determination by the use of bare soil

Effect of topography on SAR calibration

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