[SLR-Mail] No.2063: Re: [ilrs] URGENT MAIL - Envisat Major Anomaly
Author:
Pierre F
Content:
Dear all,
At Grasse Meo station, we just successfully tracked Envisat this morning (April 11 - 9h UTC) with a time bias of -6.2 ms(predicts #6021) Hoping useful information
Observatoire de la Côte d´Azur Avenue Nicolas Copernic 06130 Grasse Phone : +33 (0)4 93 40 54 20 Fax : +33 (0)4 93 09 26 14 E-mail : francis.pierron@oca.eu ============================================================================================================================
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Dear all,
At Grasse Meo station, we just successfully tracked Envisat this morning (April 11 - 9h UTC) with a time bias of -6.2 ms(predicts #6021)
Hoping useful information
Best regards
Francis and Grasse Laser Staff
Le 11/04/2012 03:19, Moblas a écrit :
http-equiv=”Content-Type”> Gday All.
I have just seen ENVISAT, and it tracked OK using predicts #6012, with no range or time bias needed. It started to come in when it went through to the S/E of our station.
Since Sunday 8 April 2012, at the Kiruna pass at 12:28UTC, Envisat is not transmitting any telemetry anymore. Only an un-modulated S-Band RF carrier was received on-ground. No X-Band and Ka-Band (via Artemis) data were received as from the same time.
An extended network of ground stations was immediately activated to send commands to the satellite, but all attempts are unsuccessful so far. The S-band carrier which was initially still available disappeared after few hours.
Can you please confirm if the Envisat satellite is visible from the different laser stations?
Thanks for your prompt support.
Kind regards, Pierre Féménias
ESA - European Space Agency
Pierre Féménias EOP-GMQ Sensor Performances, Products and Algorithms Office Earth Observation Ground Segment Department
ESRIN Via Galileo Galilei Casella Postale 64 I-00044 Frascati, Italy Pierre.Femenias@esa.int | www.esa.int T +39 06 941 80674 | F +39 06 941 80612
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-- ============================================================================================================================ Francis Pierron UMR GeoAzur Equipe ASTRO-GEO, Métrologie de l´Univers proche
Observatoire de la Côte d´Azur Avenue Nicolas Copernic 06130 Grasse Phone : +33 (0)4 93 40 54 20 Fax : +33 (0)4 93 09 26 14 E-mail : francis.pierron@oca.eu ============================================================================================================================