ROM SAF - NRT Notification Detail

NRT Notification Detail

Scheduled Outage of GRAS Level 1 b Data

DATE: 2010-07-19 10:16
TYPE: NRT-GTS

Description

Dear GRAS SAF GTS User Issued 2010-07-19 10:15 UTC Due to maintenance of the GRAS Ground Support Network there is a risk of a brief outage of GRAS SAF products tomorrow ( 2010-07-20 ). Please see detailed message from EUMETSAT below. Kind regards The GRAS SAF Team Forwarded message: Subject: Upgrade of GPS orbit processing for GRAS From: Christian Marquardt Date: 2010-07-19 08:07 UTC Dear all, tomorrow, the GRAS Ground Support Network (GSN) will finally switch its operational software for estimating GPS satellite positions and clock biases for the GRAS processing to the state-of-the-art NAPEOS suite. NAPEOS has been running in ESOC's IGS processing for some time now, and delivered significantly improved results; it has, in fact, turned ESOC to one of the leading IGS processing centres;-) In our parallel testing of the GRAS processing with the new data products from GSN, we have seen improved orbit quality and a better stability of the operational GRAS Precise Orbit Determination (POD). These tests have been carried out over a few months, and no major problems were discovered (and only one very minor, actually). We are thus confident that the change will have very little (negative) impact on the GRAS processing. The change in the GSN product will take place during the (local) morning of tomorrow, 20 July 2010. Because one of the many changes introduced by the new software is a different handling of the time offset to GPS time, our operational processing will most likely produce a reset of the GRAS POD. We will try to minimize the impacted period by reusing state vectors from our test ground segment. In the best case, data should only be degraded for a few minutes; in the worst case, we will experience a conventional POD reset and convergence over about four hours, during which the level 1b data will be flagged as degraded accordingly. I'll inform you about how the change went during tomorrow. With kind regards, Christian. -- Dr. Christian Marquardt, Polar System Product Expert EUMETSAT, Am Kavalleriesand 31, D-64295 Darmstadt, Germany

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