Polarisation and sea echo

Long, Maurice W.

doi:10.1049/el:19670040

Cited by 9 publications

(4 citation statements)

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“…It is important to notice that one of the main objective targeted by Compact builders in the seventieth [1], [2] was the generation of dual CP information (RR-RL or LL-LR) from Compact dual-polarization RH-RV measurements. Dual transmitted-received CP provide more efficient information than dual-Compact measurements (RH-RV or LH-LV) for keys applications such as ship detection [5], soil moisture (LeToan 2008), ice monitoring and forest mapping [10].…”

Section: Compact Sar Calibrationmentioning

confidence: 99%

“…The Hybrid-Compact mode concept firstly introduced in the 1960th [1], [2], has been recently resuscitated [3], [4]. Basically, Hybrid-Compact dual-pol SAR transmits at a polarization that is a combination of equally weighted horizontal and vertical polarizations (with a phase shift of 45 • for the π/4-mode, or 90 • for the Compact mode) and measures the backscattered wave at the horizontal or vertical polarization [3].…”

Section: Introductionmentioning

confidence: 99%

“…More focus was assigned in [4] to the Compact mode with CP transmission. The latter is a simplified architecture of the conventional dual circular polarization adapted to an antenna with horizontal and vertical polarization feds [1], [2]. In contrast to conventional Dual-pol CP (RR-RL), the receiving antenna operates at H and V polarization with the eventual loss of polarization efficiency related to the use of unmatched antenna [5].…”

Section: Introductionmentioning

confidence: 99%

“…The Compact, which is equivalent in terms of information to the conventional Dual-CP, is an attractive option for a dual-polarized SAR that offers complementary information to the conventional dual-polarized HH-HV and VV-VH modes [1], [2]. Like conventional dual-pol SAR, there is no requirement for doubling of the PRF, and as a result, Compact offers the capability of SAR imaging at large swath.…”

Section: Introductionmentioning

confidence: 99%

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Requirements on the calibration of Hybrid-Compact SAR

Touzi¹,

Charbonneau²

2014

2014 IEEE Geoscience and Remote Sensing Symposium

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The state of the art in compact SAR calibration is reconsidered. It is shown that all the existing Compact calibration methods are built on the assumption that the Compact transmits a perfect circular polarization (CP). Unfortunately, the actual technology does not permit the generation of a perfect CP wave. The impact of non circularity of the transmitted polarization on Compact polarization information is assessed. The variations with incidence angles of the helicity and ellipticity of the transmitted polarization are simulated for C-band and L-band Compact SAR using Radarsat-2 and Alos data. This permits quantification of the resulting radiometric error on RH and RV dual-pol measurements. The impact of the non circularity of the transmitted polarization on the degree of polarization (DoP) and Compact polarization synthesis is also quantified. The requirements on the calibration of compact SAR for the extraction of a meaningful polarimetric SAR information from compact, are then setup.

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Section: Compact Sar Calibrationmentioning

confidence: 99%