| Titre | Requirement on antenna cross-polarization isolation for the operational use of C-band SAR constellations in maritime surveillance |
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| Auteur | Touzi, R; Vachon, P W; Wolfe, J |
| Source | IEEE Geoscience and Remote Sensing Letters vol. 7, no. 4, 5535116, 2010 p. 861-865, https://doi.org/10.1109/LGRS.2010.2053835 |
| Année | 2010 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20181892 |
| Éditeur | Institute of Electrical and Electronics Engineers (IEEE) |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1109/LGRS.2010.2053835 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Sujets | télédétection; géophysique |
| Programme | Direction du Centre canadien de télédétection |
| Diffusé | 2010 10 01 |
| Résumé | (disponible en anglais seulement)
The issue of antenna cross-polarization isolation has been previously discussed for the design of fully polarimetric synthetic aperture radars (SARs).
Dual-polarized antennas with cross-polarization isolation that is better than -30 dB are desirable for more convenient polarimetric data calibration since measurements of antenna crosstalk (magnitude and phase) variations with incidence angle are not
required. For an antenna with significant polarization crosstalk, it is still possible to retrieve pure polarization measurements of HH, HV, VH, and VV provided that the four corresponding received voltages are measured. However, it is not possible
to recover from cross-polarization contamination for single- or dual-polarization measurements. Therefore, it is important to set up a minimum requirement on dual-polarized antenna isolation so that single- and dual-polarization applications are not
unduly affected. In this letter, the minimum requirement on cross-polarization antenna isolation is investigated for operational use of C-band SARs in maritime surveillance applications. Calibrated polarimetric RADARSAT-2 data are used to simulate
single- and dual-polarization data with cross-polarization contamination for a dual-polarized antenna with cross-polarization isolation ranging from -20 to -35 dB. It is shown that the cross-polarization HV (or VH) channel can be significantly
affected, particularly at steep incidence angles. As a result, key applications that require the use of pure HV, such as ship detection and wind-speed measurements, are significantly affected. A requirement for a minimum of -30-dB antenna isolation
is established. Antennas with cross-polarization isolation better than -35 dB are desirable for reliable exploitation of HV data at steep incidence angles. |
| GEOSCAN ID | 312247 |
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