Subject: [ids.analysis.forum] TR : DORIS residuals from Jason 2 cycle 79 for specific stations affected by multipath.
From: "Lemoine, Frank G. (GSFC-6980)" <[email-masked]>
To: "[email-masked]" <[email-masked]>
Date: Sat, 9 Oct 2010 03:52:31 -0500

Dear IDS Analysis Forum:

Please see this message prepared by Luca Cerri (CNES),
concerning DORIS residuals vs elevation from Jason-2 cycle 79, for
specific stations  affected by multipath.

FrankL
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De : Cerri Luca [[email-masked]]
Date d'envoi : vendredi 8 octobre 2010 03:56
À : Zelensky, Nikita P. (GSFC-698.0)[SGT, INC]; Mercier Flavien (contact)
Cc : BERTHIAS JEAN-PAUL; [email-masked]; Le Bail, Karine  (GSFC-698.0)[NVI INC]
Objet : RE: DORIS residuals

Hi,
Flavien made me notice that residuals from several stations are affected by multipath close to the antenna axis.
These plots are residuals from J2 cycle 79, abscissa is elevation in degrees and ordinates are delta-phase residuals in mm (divide by 10 to obtain mm/s).
KOLB shows the typical oscillation above 50, with amplitudes of 1-2 mm/s .
Other stations have similar behaviour, and this may explain the global increase of RMS at high elevation.
However it should be visible also on other satellites.
(see also http://ids-doris.org/documents/report/AWG200903/SOD_PhaseResidualMapsJason2AllStationsCy001_017.pdf for various antenna phase maps)
Luca and Flavien

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