Ionospheric and tropospheric effects on synthetic aperture radar performance

Quegan, S.; Lamont, J.

doi:10.1080/01431168608954707

Cited by 58 publications

(28 citation statements)

References 2 publications

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“…L-band SAR signals are less affected by temporal canopy changes than C-band signals, which could be severely affected by ionospheric heterogeneities occurring during the synthetic aperture calculation (e.g. Quegan and Lamont [1986]; Mattar and Gray [2002]). Due to the dispersive nature of the medium, the refractive index in the ionosphere depends on the inverse of the square of the employed electromagnetic frequency.…”

Section: Atmospheric Correctionsmentioning

confidence: 99%

A comprehensive interferometric process for monitoring land deformation using ASAR and PALSAR satellite interferometric data

Dehghan-Soraki

Sharifikia

Sahebi

2015

GIScience & Remote Sensing

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This study was conducted to apply the enhanced differential interferometric process to interferometric data obtained from C-band Advanced Synthetic Aperture Radar (ASAR) and Phased Array type L-Band Synthetic Aperture Radar (PALSAR) systems, in the Marand plain, Iran. In advance, the capability of each sensor was examined with regard to the signal coherency for sensor-target interactions, which emphasized on the terrific excellency of PALSAR (L-band) to ASAR (C-band) measurements in study area. In the interferometric process, in addition to resolving the topography and baseline related errors (which is conventional in the standard D-InSAR process), subtle quantitative methods were outlined to minimize the secondary, but momentous errors (i.e., orbital and atmospheric) from differential phases. Subsequently, based on the outlined process, the mean deformation as well as three-dimensional displacement maps (using ascending and descending modes) were generated. The deformation maps significantly indicated the downward motion of the surface with the maximum rate of −0.5 millimetre per day for the period, i.e., from 2004 to 2010, with relative dominance in eastern and central to northern parts of the Marand plain. Finally, the results were validated and the source of deformation was inspected using field data such as seismic history; changes in piezometric levels and cross-checking the results from radar measurements itself.

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Section: Atmospheric Correctionsmentioning

confidence: 99%

A comprehensive interferometric process for monitoring land deformation using ASAR and PALSAR satellite interferometric data

Dehghan-Soraki

Sharifikia

Sahebi

2015

GIScience & Remote Sensing

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“…In our simulations, a two-parameter spectrum is used to generate the electron density profile. For a two-way path, the spectral density function in 1D k space can be described as [18] (see (22))…”

Section: Effects Of Ionospheric Turbulencementioning

confidence: 99%

“…In 1986, Quegan and Lamont analysed the effect of the ionosphere on SAR resolution degradation via using the phase screen model to predict the form of the phase fluctuations along the synthetic aperture [18]. Assuming a homogeneous layer of constant electron density for the ionosphere, Ishimaru et al [19] analytically studied the ionospheric irregularity, ionospheric dispersion and Faraday rotation effect for P-band polarisation SAR.…”

Section: Introductionmentioning

confidence: 99%

Ionospheric effects on three‐dimensional imaging of L‐band geosynchronous circular synthetic aperture radar

Kou

Xiang

Wang

2014

IET Radar, Sonar & Navigation

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Circular synthetic aperture radar (SAR) imaging on the geosynchronous orbit has many potential advantages, such as high-resolution three-dimensional (3D) imaging and continuous surveillance of broad area. The mission considered is an L-band geosynchronous circular SAR (GEOCSAR) with full aperture measurement. Since the integration time of GEOCSAR can be as long as 24 h, the orbit altitude is about 36 000 km and the coverage may reach 1/3 of the Earth's surface. The spatial and temporal variation of the ionosphere may impose significant effects on 3D imaging performance of GEOCSAR. The effects of ionospheric spatial variation including vertical and horizontal structure, the ionospheric turbulence and the ionospheric temporal variation are discussed. The analysis shows that the temporal variation of the ionospheric electron content during the synthetic aperture and the ionospheric turbulence may severely affect the GEOCSAR focusing performance on the XY plane. The vertical and horizontal structure of the ionosphere will cause image shift, and the dispersion effect is negligible.

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“…During the past decade, some good theoretical models and the corresponding analysis of the effects of the ionosphere on spaceborne SAR were introduced [3]- [12], in which only the effects of the background ionosphere on range resolution were studied. Liu [9]- [11] considered the effects of ionospheric Manuscript irregularities on the SAR range resolution and believed that they could be neglected.…”

Section: Introductionmentioning

confidence: 99%

SAR Imaging Degradation by Ionospheric Irregularities Based on TFTPCF Analysis

2007

IEEE Trans. Geosci. Remote Sensing

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The effects of ionospheric irregularities on spaceborne synthetic aperture radar (SAR) signal propagation with double path and multilook angle are studied in a model in which a two-frequency and two-position coherence function (TFTPCF) has been adopted for analysis. The TFTPCF is derived from the phase-screen principle. The ambiguity function based on TFTPCF has been used to analyze the effects of ionospheric turbulence on range resolution and cross resolution. The results show that, in some cases, the effects from the irregularities on SAR imaging can be very serious.Index Terms-Cross resolution, ionospheric irregularities, range resolution, synthetic aperture radar (SAR), two-frequency and two-position coherence function (TFTPCF).

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Ionospheric and tropospheric effects on synthetic aperture radar performance

Cited by 58 publications

References 2 publications

A comprehensive interferometric process for monitoring land deformation using ASAR and PALSAR satellite interferometric data

A comprehensive interferometric process for monitoring land deformation using ASAR and PALSAR satellite interferometric data

Ionospheric effects on three‐dimensional imaging of L‐band geosynchronous circular synthetic aperture radar

SAR Imaging Degradation by Ionospheric Irregularities Based on TFTPCF Analysis

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