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ГНСС рефлектометрия

Добавлено: 23 янв 2015, 21:41
Vladislav Kalinnikov
Конференция по ГНСС рефлектометрии пройдет в Потсдаме с 11 по 13 мая 2015 года.

The 8th workshop on GNSS reflectometry (GNSS+R 2015) will take place at the Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences in Potsdam on May 11–13, 2015. The GNSS reflectometry is a new emerging field in geodesy and for the first time the workshop will be held at a famous historical place in Germany. Until today, the GFZ is still one of the most important geodetic institutions worldwide.

The reflectometry workshop will highlight results obtained in a field of microwave remote sensing in which existing signals, transmitted for other purposes, are re-utilized as sources of illumination. This includes some features of active radar scatterometry, passive radiometry, and altimetry.

Information on registration, abstract submission, and accommodation will follow soon.

We hope to see you in May 2015 in Potsdam!

Cordially, the GNSS+R 2015 organizing team

http://www.iag-aig.org/index.php?tpl=te ... 0&id_t=632

Re: ГНСС рефлектометрия

Добавлено: 23 янв 2015, 21:44
Vladislav Kalinnikov
Красноярские ученые разрабатывают космический влажномер


Re: ГНСС рефлектометрия

Добавлено: 17 мар 2015, 22:21
Александр Устинов
Vladislav Kalinnikov писал(а):Конференция по ГНСС рефлектометрии пройдет в Потсдаме с 11 по 13 мая 2015 года.

Re: ГНСС рефлектометрия

Добавлено: 18 мар 2015, 19:23
Vladislav Kalinnikov
Нет, это нереально)

Re: ГНСС рефлектометрия

Добавлено: 09 июл 2015, 22:04
Александр Устинов
Levelling co-located GNSS and tide gauge stations using GNSS reflectometry

Alvaro Santamaría-Gómez, Christopher Watson, Médéric Gravelle, Matt King, Guy Wöppelmann

The GNSS reflectometry technique provides geometric information on the environment surrounding the GNSS antenna including the vertical distance to a reflecting surface. We use sea-surface reflections of GPS signals, recorded as oscillations in signal-to-noise ratio (SNR), to estimate the GNSS to tide gauge (TG) levelling tie, and thus the ellipsoidal heights of the TG. We develop approaches to isolate SNR data dominated by sea-surface reflections and to remove SNR frequency changes caused by the dynamic sea surface. Comparison with in situ levelling at eight sites reveals mean differences at the centimetre level for satellites above 12∘ elevation, with four sites showing differences of 3 cm or smaller. These differences include errors in the in situ levelling, in the antenna calibration model and in the TG measurements, and so represent an upper bound on our technique’s error. Data sampling (1 or 30 s) does not significantly affect the results. We detect systematic errors at the decimetre level related to satellite elevations below 12∘ and to sea-surface height and also differences between results from the L1 and L2 GPS signals larger than 15 cm at two sites. These systematic errors remain unexplained; differences between GPS signals are attributed to receiver-dependent differences in the SNR measurements, while the elevation-dependent error is attributed to unmodelled phase effects such as those caused by tropospheric refraction and sea-surface roughness. Using our approach, we identify a levelling offset of 1.5 cm related to a TG sensor change, illustrating our technique’s value for TG reference monitoring.

http://link.springer.com/article/10.100 ... 014-0784-y