مورد إلكتروني
First Precise Spaceborne Sea Surface Altimetry With GNSS Reflected Signals
| العنوان: | First Precise Spaceborne Sea Surface Altimetry With GNSS Reflected Signals |
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| بيانات النشر: | Institute of Electrical and Electronics Engineers 2020-02-12 |
| تفاصيل مُضافة: | Ministerio de Ciencia, Innovación y Universidades (España) European Commission Cardellach, Estel Li, Weiqiang Rius, Antonio Semmling, Maximilian Wickert, Jens Zus, Florian Ruf, Chris Buontempo, Carlo |
| نوع الوثيقة: | Electronic Resource |
| مستخلص: | The precision of sea surface altimetry using bistatically reflected signals of the Global Navigation Satellite System (GNSS) is typically one to two orders of magnitude worse than dedicated radar altimeters. However, when the scattering is coherent, the electromagnetic phase of the carrier signal can be tracked, providing precise ranging measurements. Under grazing angle (GA) geometries, the conditions for coherent scattering are maximized, enabling carrier phase-delay altimetric techniques over sea waters. This work presents the first implementation of GA carrier phase sea surface altimetry using data acquired from a spaceborne platform (NASA Cyclone GNSS mission) and transmitted from both GPS and Galileo constellations. The altimetric results show that the measurement system precision is 3/4.1 cm (median/mean) at 20 Hz sampling, cm level at 1 Hz, comparable to dedicated radar altimeters. The combined precision, including systematic errors, is 16/20 cm (median/mean) precision at 50 ms integration (a few cm level at 1 Hz). The wind and wave requirements to enable coherent scattering at GA geometries appear to be below 6 m/s wind and 1.5 m significant wave height, although only 33% of tracks under these conditions present sufficient coherence. Given that this technique could be implemented by firmware updates of existing GNSS radio occultation missions, and given the large number of such missions, the study indicates that the resulting precision and spatio¿temporal resolution would contribute to resolving some submesoscale ocean signals. |
| مصطلحات الفهرس: | Carrier phase-delay altimetry, Global Navigation Satellite System (GNSS), Reflectometry, Grazing angle (GA) reflectometry, Sea surface altimetry, Submesocale ocean altimetry, artículo |
| URL: | Publisher's version Sí info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-099008-B-C22 |
| الإتاحة: | Open access content. Open access content https://creativecommons.org/licenses/by/4.0 openAccess |
| أرقام أخرى: | CTK oai:digital.csic.es:10261/236300 IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 13: 8945180 (2020) 10.1109/JSTARS.2019.2952694 1286568707 |
| المصدر المساهم: | CSIC From OAIster®, provided by the OCLC Cooperative. |
| رقم الأكسشن: | edsoai.on1286568707 |
| قاعدة البيانات: | OAIster |
| الوصف غير متاح. |