| Date: | 2001-03-08 23:20:00 | |
| Sender: | Scott Wetzel <Mike Pearlman <mpearlman@cfa.harvard.edu>> | |
| Subject: | [SLR-Mail] No. 749: Implementation of New Prediction Exploder - Action Required | |
| Author: | Scott Wetzel | |
| Content: | ******************************************************************************** SLR Electronic Mail 2001-03-08 23:20:00 UTC Message No. 749 ******************************************************************************** Author: Scott Wetzel Subject: Implementation of New Prediction Exploder - Action Required Attention Stations, Implementation of New Prediction Exploder Dear Colleagues, In following with discussions that occurred at the SLR meetings in Nice and Matera in 2000, the ILRS CB is preparing to formally initiate the SLR prediction exploder services. In order to begin this new process several changes need to occur by both the prediction providers and by users of the predictions. For those who were not in attendance in the Matera meeting last fall, the ILRS CB stated that a prediction exploder service had been developed and tested so that all predictions would be provided by a central method. This service includes a built-in backup system in the case of problems with the primary service. This exploder and its backup system were successfully tested prior to the Matera meeting but because of unforeseen delays, it has yet to be implemented. There are, of course some minor modifications that are required of each organization prior to changing over to the new system. Stations need to make minor software modifications to accept a format change in the subject of each prediction. Once those hurdles have been crossed, we can go operational. 1. Standard Prediction Data Products: a. CURRENT The current subject line that is used when delivering standard prediction data products appeared differently dependent on the provider. For HTSI predictions we send Subject: tuned AJISAI irvs For the CHAMP predictions the subject is as follows; Subject: CHAMP orbit predictions And so on... b. NEW For the new prediction exploder all prediction providers will incorporate the new subject line. Each provider will provide the same format for the Subject line as follows...(for example of Ajisai)... Subject: satellite_name update_frequency IRVS irv_provider An example for a daily Ajisai prediction provided by HTSI would be sent as follows: Subject: AJISAI DAILY IRVS HTSI Specific key words are to be used for each satellite, provider, and frequency of the prediction. The following are the list of satellite names to be used in the Subject line: AJISAI LAGEOS-1 BE-C LAGEOS-2 CHAMP ETALON-1 ERS-2 ETALON-2 GFO-1 GPS-35 TOPEX GPS-36 WESTPAC GLONASS-78 STARLETTE GLONASS-80 STELLA GLONASS-84 The new satellite identifiers will be provided as part of the mission planning activities and will be provided by the Missions Working Group prior to the mission start. Next is the list of update frequency terms to use: HOURLY WEEKLY SUBDAILY BIWEEKLY DAILY MONTHLY Finally, is the list of providers which currently include: HTSI RGO GFZ and including the following groups that currently do not provide predictions but either have or are planning on providing predictions in the future. They include: NSD (National Space Development Agency of Japan) MCC (Mission Control Center) CSR (Center for Space Research) Graham, if you are so inclined to formally change your identifier from RGO to NERC, now would probably be the time to do so. Please include a notification to the systems that this will occur. 2. For Drag Functions For those who provide drag functions please use the following format in your message subject Subject: satellite_name FR drag function Example: Subject: CHAMP FR drag function Please use the above reference for the satellite names. Also, for further information on the maneuver message, please see the ILRS web site for the revised maneuver message format and procedure at http://ilrs.gsfc.nasa.gov/drag_function.html 3. For Maneuver Messages Subject: satellite_name man preds yyyy/mm/dd,hh:mm:ss Example: Subject: GFO-1 man preds 2000/02/24,12:25:02 Again, please use the above reference for the satellite names. Also, for further information on the maneuver message, please see the ILRS web site for the revised maneuver message format and procedure at http://ilrs.gsfc.nasa.gov/manoeuver.html 4. For Standard Time Bias Functions Subject: Standard Time Bias Function Example: Subject: Standard Time Bias Function Again, please use the above reference for the satellite names. Also, for further information on the maneuver message, please see the ILRS web site for the revised maneuver message format and procedure at http://ilrs.gsfc.nasa.gov/tb_format_intro.html 5. Delivery of Messages You should still receive your predictions as before by mail so the change in the delivery of predictions, maneuvers, drag functions and time bias messages will be transparent to each of you with the exception of the subject line for each product. For users of the CHAMP and ERS-2 predictions, drag functions or other messages, for a certain period, GFZ will maintain their complete distribution list and use it for dissemination of their products in addition to the Prediction Exploder System at ILRS as an extra backup. The mail subjects would follow the adopted new conventions and thus be identical. Hence the stations would only need to maintain the new mail subject standard. As a consequence, those stations already implemented at of identical IRVS during this period. Therefore GFZ asks those stations receiving multiple copies from ILRS and GFZ to send an email to them at prd@gfz-potsdam.de will delete you from their exploder distribution list. The ILRS CB is looking to implement these changes by March 15th. In order to meet with this implementation date you will need to make any necessary changes to your software to accommodate for the new format. Please let me know of any issues that may cause a delay in this process and we can discuss our options. I would appreciate any efforts to get this implemented by the March 15th date. Thanks and very best regards. Scott Wetzel - ILRS CB Scott L. Wetzel, SLR Mission Operations Manager NASA Satellite Laser Ranging Program Honeywell Technology Solutions Inc. Phone: 301-805-3987 Fax: 301-805-3974 E-mail: scott.wetzel@honeywell-tsi.com Dr. Michael R. Pearlman Harvard-Smithsonian Center for Astrophysics 60 Garden St. Cambridge MA 02138 tel. (617) 495-7481 fax. (617) 495-7105 e-mail. mpearlman@cfa.harvard.edu From: ”Mike Pearlman” ******************************************************************************** |