CDDIS | Bulletin Volume 14, No. 1

+ NASA Homepage

SEARCH CDDIS

CDDIS Bulletin - October 1998
Volume 14 No. 1

In this issue:

Cover: Proposed IGEX-98 GLONASS Sites
Articles:
Data Bits and Bytes:
- Borowiec Barometer Correction
- Permanent GPS Network Update

About the cover: The map on the cover of this issue of the CDDIS Bulletin shows the network of GLONASS receivers proposed to participate in the IGEX-98 campaign. Over seventy receivers were proposed to participate; as of October 1, seven sites are submitting data routinely to the IGEX data centers.

IGS Network Systems Workshop

NASA Goddard Space Flight Center, through the Crustal Dynamics Data Information (CDDIS), an IGS Global Data Center, in conjunction with the IGS Central Bureau, will host the IGS Network Systems Workshop for three and one half days on November 2-5, 1998 in Annapolis, MD. The goals of this workshop include:

developing a closer community within the IGS infrastructure
strengthening communications within this community
improving the performance of the network
developing a shared vision of the future network
preparing a proceedings targeted along the lines of an "IGS Network Operations Plan" that would document the network operations of the IGS and future plans

The IGS has been an operational service for nearly five years, providing GPS data and products from a globally distributed network of high precision GPS receivers. Since its inception, the IGS has not sponsored a workshop of this type, focusing on the network and infrastructure issues and how future plans for the IGS affect these components. This workshop will provide a venue for the various network components of the IGS to meet and discuss our current configurations, problems and their resolutions, how to incorporate the many future requirements into our existing infrastructure, and what new technologies are available that we should take advantage of.

A web site has been developed to provide the latest information about the IGS Network Systems Workshop. This site also provides registration and hotel information. The URL for the workshop web site is: http://cddisa.gsfc.nasa.gov/igs_netws/netws_home.html.

GLONASS Data and Products Available through the CDDIS

The CDDIS has recently been selected as a Global Data Center to support the 1998 International GLONASS Experiment (IGEX-98). This international campaign, which will operate from October 19, 1998 through January 20, 1999, is sponsored by:

the International Association of Geodesy (IAG) Commission VIII, International Coordination of Space Techniques for Geodesy and Geodynamics (CSTG)
the International GPS Service for Geodynamics (IGS),
the Institute of Navigation (ION), and
the International Earth Rotation Service (IERS)

The main purpose of IGEX-98 is to conduct the first global GLONASS observation campaign for geodetic and geodynamics applications and evaluate the results. Daily GLONASS data files will be available through the data centers as well as products generated from these data. Available data include GLONASS observation files, GPS and GLONASS navigation files, meteorological data (where available), summary files, all in compressed RINEX format. Products include daily and/or weekly precise GLONASS satellite ephemerides and satellite clock information. Table 1 below lists the sites that have supplied data to the CDDIS as of late September 1998.

Table 1. GLONASS Tracking Sites Currently Available through the CDDIS

Mon. Name	Site Name/Location	Data Source	Receiver Type	Start Date	Met Data?
BORG	Borowiec, Poland	IGN	3S Navigation R100	19-Sep-98	No
BRUG	Brussels, Belgium	IGN	3S Navigation R100	16-Sep-98	No
CSIR	Pretoria, South Africa	CDDIS	3S Navigation R100	23-Sep-98	No
DLFT	Delft, The Netherlands	IGN	Ashtech GG24C	09-Sep-98	No
GODZ	GSFC, Greenbelt, MD	CDDIS	Ashtech Z-18	28-Aug-98	Yes*
WTZG	Wettzell, Germany	IGN	3S Navigation R101	06-Sep-98	No
ZIMZ	Zimmerwald, Switzerland	IGN	Ashtech Z-18	10-Sep-98	No

*Note: Meteorological data from Greenbelt is available for the GPS GODE site and is stored with that data set

Users interested in accessing the data and products should contact Carey Noll (noll@cddis.gsfc.nasa.gov) for instructions. More information on the IGEX-98 experiment can be found on the web site at URL http://lareg.ensg.ign.fr/IGEX.

ILRS Update

Mike Pearlman/CfA, Carey Noll/CDDIS

Elections to complete the governing board for the International Laser Ranging Service (ILRS) were held during August and September. The ILRS Governing Board has now been appointed/elected and stands as follows:

IERS Representative	Bob Schutz
CSTG Representative	Gerhard Beutler
Central Bureau Director	John Bosworth
Central Bureau Secretary	Mike Pearlman
EUROLAS Network Representatives	Wolfgang Schlueter
EUROLAS Network Representatives	Werner Gurtner
WPLTN Network Representatives	Hiroo Kunimori
WPLTN Network Representatives	Yang Fu Min
NASA Network Representatives	John Degnan
NASA Network Representatives	David Carter
Lunar Representative	Peter Shelus
Data Center Representative	Wolfgang Seemueller
Analysis Representatives	Richard Eanes
Analysis Representatives	Ron Noomen
At-Large Representatives	Francois Barlier
At-Large Representatives	John Luck

John Degnan was elected chairman of the ILRS Governing Board during its first meeting, held at the International Laser Ranging Workshop in Germany in September 1998.

Through the labors Van Husson, Carey Noll, Mark Torrence and others the first version of the International Laser Ranging Service (ILRS) Web Site is now available for review at the URL http://ilrs.gsfc.nasa.gov/ilrs_home.html. The web site is a dynamic entity, in need of user feedback. Comments, suggestions, corrections, etc. should be forwarded to Carey Noll (noll@cddis.gsfc.nasa.gov) and Van Husson (hussonv@thorin.atsc.allied.com).

Users are also asked to ensure their contact information is accurate on the ILRS Web Site; this information can be viewed on the email directory page at URL http://ilrs.gsfc.nasa.gov/ilrsemail.html. Corrections and additions can be sent to Carey Noll. Users who are not ILRS Associates but are interested in ILRS activities and would like to receive ILRS publications and literature, may become ILRS Correspondents. Again, interested users should contact Carey Noll at the email address above.

CDDIS Bulletin, Volume 13 -- Index

Access to GPS Data and Products through the CDDIS

This is a reminder that users of GPS data and products available through the CDDIS should utilize the new computer, cddisa.gsfc.nasa.gov, operational as of June 01, 1998. For more details on this system, users should read the article in the June issue of the CDDIS Bulletin or contact Carey Noll (noll@cddis.gsfc.nasa.gov).

DATA BITS AND BYTES

This section is designed to give brief notices of special events, new data sets, or problems encountered in recent months. The CDDIS staff believes the user community should be informed of these problems in order to ensure that the best results possible are produced from data issued by the archive.

Borowiec Barometer Correction

Stanislaw Schillak/Borowiec Astrogeodynamic Observatory

The Borowiec SLR (station 7811) barometer gave systematic false readings for the period July 21, 1993 through June 30, 1998. The constant difference between the bad and correct values was 3.4+/-0.6 millibars. This difference includes an error of readings as well as the location of the old barometer (about 4 meters below the intersection of the mount axes). A correction of 3.4 millibars should be subtracted from the pressure in the all Borowiec normal point data prior to July 01, 1998. The Borowiec SLR staff regrets any inconvenience this problem has caused the user community.

Permanent GPS Network Update

Since the August 1998 issue of the CDDIS Bulletin, the CDDIS has archived data from the following new GPS tracking sites:

Table 2. New GPS Tracking Sites

Mon. Name	Site Name/Location	Data Source	Receiver Type	Start Date	Met Data?
AMUN	Amundsen-Scott S. Pole Station, Antarctica	USGS	Ashtech Z-XII3	08-Jul-98	No
CEDU	Ceduna, Australia	AUSLIG	Rogue SNR-8100	20-Aug-98	No
GOUG	Gough Island	AWI	Trimble 4000 SSI	14-Aug-98	No
JAB1	Jabiru, Australia	AUSLIG	Ashtech Z-XII3	26-Jul-98	No
PALM	Palmer Station, Antarctica	USGS	Ashtech Z-12R	08-Jul-98	No
VESL	Sanae, Antarctica	AWI	Trimble 4000 SSI	13-Aug-98	No

Furthermore, since the August 1998 issue of the bulletin, the CDDIS has archived near real-time data from the following GPS tracking sites:

Table 3. New GPS Tracking Sites

Mon. Name	Site Name/Location	Data Source	Receiver Type	Start Date
AOA1	AOA, Westlake, CA	JPL	Rogue SNR-8000	10-Aug-98
AUCK	Auckland, New Zealand	JPL	Rogue SNR-8000	10-Aug-98
CICE	Ensenada, Mexico	JPL	Rogue SNR-8000	10-Aug-98
CIT1	CIT, Pasadena, CA	JPL	Rogue SNR-8000	10-Aug-98
EISL	Easter Island, Chile	JPL	Rogue SNR-8000	10-Aug-98
GODE	GSFC, Greenbelt, MD	JPL	Rogue SNR-8000	10-Aug-98
GOL2	Goldstone, CA	JPL	Rogue SNR-12	10-Aug-98
JPLF	JPL, Pasadena, CA	JPL	Rogue SNR-8000	10-Aug-98
KIRU	Kiruna, Sweden	ESA	Rogue SNR-8100	14-Sep-98
KOKB	Kokee Park, HI	JPL	Rogue SNR-8000	10-Aug-98
KOUR	Kourou, French Guiana	ESA	Rogue SNR-8100	21-Sep-98
KWJ1	Kwajalein, Marshall Islands	JPL	Rogue SNR-8000	10-Aug-98
MAD2	Madrid, Spain	JPL	Rogue SNR-12	10-Aug-98
MCM4	McMurdo Base Station, Antarctica	JPL	Rogue SNR-8000	10-Aug-98
MDO1	McDonald Observatory, TX	JPL	Rogue SNR-8000	10-Aug-98
MKEA	Mauna Kea, HI	JPL	Rogue SNR-12	10-Aug-98
NLIB	North Liberty, IO	JPL	Rogue SNR-8000	10-Aug-98
OAT2	Oatt Mountain, CA	JPL	Rogue SNR-8100	10-Aug-98
PERT	Perth, Australia	ESA	Rogue SNR-8100	22-Sep-98
PIE1	Pie Town, NM	JPL	Rogue SNR-8000	10-Aug-98
QUIN	Quincy, CA	JPL	Rogue SNR-8000	10-Aug-98
SANT	Santiago, Chile	JPL	Rogue SNR-12	10-Aug-98
SUTH	Sutherland, South Africa	JPL	Rogue SNR-8000	10-Aug-98
TID2	Tidbinbilla, Australia	JPL	Rogue SNR-12	10-Aug-98
UCLP	UCLA, Los Angeles, CA	JPL	Rogue SNR-8000	10-Aug-98
USUD	Usuda, Japan	JPL	Rogue SNR-8000	10-Aug-98
VILL	Villafranca, Spain	ESA	Rogue SNR-8100	21-Sep-98

+ Privacy Policy and Important Notices

Author: Carey E. Noll
Responsible NASA Official: Ed Grayzeck
Last Updated: May 27, 2005

CDDIS Bulletin - October 1998 Volume 14 No. 1

Table 2. New GPS Tracking Sites

CDDIS Bulletin - October 1998
Volume 14 No. 1