Tropospheric effects on L‐band geosynchronous circular SAR imaging

Kou, Leilei; Xiang, Maosheng; Wang, Xiaoqing; Zhu, Meiping

doi:10.1049/iet-rsn.2012.0230

Cited by 17 publications

(12 citation statements)

References 24 publications

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“…On top of this, the APS adds further decorrelation, in the long integration time (minutes), which can be so strong to demand for L-band as a safe choice [3], [4], [10]. The APS decorrelation shown in Fig.…”

Section: Monostatic Geostationary Sar: Design and Performancesmentioning

confidence: 99%

“…Spread losses are compensated by huge antenna and high power, which would require 2020 technologies [2]. It is obtaining growing interest in recent literature [3]- [5].…”

Section: Introductionmentioning

confidence: 99%

“…Nonetheless, geostationary SAR image quality is impaired by both the atmospheric phase screen (APS) [3], [9]- [11] and the backscatter decorrelation in the one-day revisit. The mitigation of decorrelation demands for long wavelengths, and in fact, typically, L-band is proposed for geosynchronous SAR.…”

Section: Introductionmentioning

confidence: 99%

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Advanced Radar Geosynchronous Observation System: ARGOS

Guarnieri

Broquetas

Recchia

et al. 2015

IEEE Geosci. Remote Sensing Lett.

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The Advanced Radar Geosynchronous Observation System is proposed to be a multiple-input-multiple-output synthetic aperture radar (SAR) system hosted on a swarm of minisatellites in quasi-geostationary orbits. The system is made of N iso-frequency sensors, each of them transmitting and receiving the signals. The system would combine the continuous imaging capabilities of a geostationary SAR, gaining a factor N 2 in signalto-noise ratio (SNR). The real aperture would be achievable in ∼40 min, enabling applications so far unseen, such as monitoring fast deformations, landslides, and other applications for emergency and security. Still, the SNR of the long acquisition time would be conserved. The optimal design of the swarm is addressed, in order to trade resolution, coverage, and revisit time. Index Terms-EarthObserving System, multiple-inputmultiple-output (MIMO) radar, radar interferometry, spaceborne radar, synthetic aperture radar (SAR).

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Section: Monostatic Geostationary Sar: Design and Performancesmentioning

confidence: 99%

“…Spread losses are compensated by huge antenna and high power, which would require 2020 technologies [2]. It is obtaining growing interest in recent literature [3]- [5].…”

Section: Introductionmentioning

confidence: 99%

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Advanced Radar Geosynchronous Observation System: ARGOS

Guarnieri

Broquetas

Recchia

et al. 2015

IEEE Geosci. Remote Sensing Lett.

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“…Based on Snell's law n(z)r sin w(z) = n 0 r 0 sin w 0 (12) where n(z) and n 0 represent the refractive index at z and the first layer of the ionosphere, r and r 0 are the range from radar and the target to the geocentre, j(z) and j 0 indicate the grazing angles. The actual range can be calculated using a ray tracing method [25] …”

Section: Ionospheric Effects On Geocsar Imagingmentioning

confidence: 99%

“…The atmospheric effects, including both tropospheric and ionospheric effect, will be one of the most important factors influencing the GEOCSAR performances. In [12], the tropospheric effects on GEOCSAR imaging are fully discussed, and the analysis shows that temporal variation of the tropospheric refractive index will degrade the SAR images. In this paper, we will thoroughly discuss the effects of the spatial and temporal variation of the ionosphere on 3D GEOCSAR imaging.…”

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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