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CDDIS Bulletin - August 1995
Volume 10 No. 6
In this issue:
About the cover: The map on the cover of this issue of the CDDIS Bulletin shows the GPS and VLBI sites in Antarctica and vicinity. The O'Higgins site is operated by IfAG, Germany; Casey, Davis, and Macquarie Island sites are part of the AUSLIG, Australia regional network. The McMurdo GPS receiver is operated by NASA/JPL.
As one of the ways to revitalize interest in space geodesy and geodynamics, NASA/GSFC has investigated methods of improving communications within the domestic and international community. Several methods were considered and it was decided that establishing an electronic mail system at the CDDIS in combination with information disseminated through the CDDIS World Wide Web (WWW) Home Page for messages posted to this mail system would be an effective method for improving communication and re-establishing a spirit of togetherness which will benefit the global program.
The proposed Space Geodesy and Geodynamics Mail System will be used for routine reports and special messages which would be immediately forwarded to all addresses on the list. A particular advantage would be the ease with which participants will be able to express their interests and concerns. The content of mail messages could include the following types of inputs:
- regular reports on NASA HQ program status, problems, and issues (submitted by NASA HQ, GSFC, JPL, and others)
- synopsis of the bi-weekly Space Geodesy Project telecons held at GSFC
- summary reports on key meetings (e.g., WEGENER, DOSE, IGP, etc.)
- future activities (including meeting announcements) submitted by NASA staff, other organizations, or investigators
- planned observation programs of research groups including suggestions or invitations to participate in joint programs
- abstracts of papers submitted by investigators
- comments, suggestions, and complaints by program participants
An archive and index of all messages sent via the system will be kept at the CDDIS, with an interface to users provided via anonymous ftp and the WWW.
The initial mailing will consist of colleagues whose e-mail addresses are currently in the CDDIS data base; these persons will soon receive an e-mail message about this new mailing system. Comments, of course, are welcome and encouraged and can be addressed to John Bosworth at GSFC (301-286-7052 or jmb@ltpmail.gsfc.nasa.gov).
The CDDIS World Wide Web (WWW) home page provides access to information about the system as well as several documents of interest, such as the NASA Space Geodesy Program: Catalogue of Site Information, the Space Geodesy Personnel and Networking Directory, and previous issues of the CDDIS Bulletin. The current issue of the bulletin is on-line at the time of publication, therefore interested users can view the latest bulletin through the WWW. It is hoped that this method of publication will eventually augment/replace hardcopy mailings and thus save time and money at the CDDIS.
Two analysis groups have recently sent results to the CDDIS for availability to the user community.
GSFC VLBI 1995 IERS Solution. The GSFC VLBI analysis groups recently submitted their 1995 IERS results to the CDDIS for availability to the user community. This submission includes two solutions, 979f and 979g. The difference is that 979g also includes data acquired by NASA's Deep Space Network and provided by Ojars Sovers of JPL. The purpose of 979g is to use additional data for the celestial reference frame. The format of the files for the terrestrial reference frame is described in the file FORMAT.TRF. Note that some files are quite large because they contain the full covariance matrix. These files were compressed on CDDIS using UNIX compression and should therefore be transferred in binary mode; all other files are in ASCII format. The files for the celestial reference frame and EOP are in IERS format as in previous years although there are additional digits in some fields. The files associated with the two solutions are listed in CONTENTS.979F4 and CONTENTS.979G2. The other files have suffixes FF or GG depending on the solution. The solution, accessible via anonymous FTP on the CDDIS in the directory ANON_DIR:[VLBIGSFC.IERS95], consists of 32 files and is 15 Mbytes in size.
GFZ GPS 1995 IERS Solution. The GPS analysis group at the Geodatishes ForshungsZentrum in Potsdam Germany has deposited their 1995 IERS Annual Solution in the CDDIS. The solution, accessible via anonymous FTP on the CDDIS in the directory ANON_DIR:[GPSGFZ.IERS95], consists of the following four files:
- GFZ95P01.DESCRIPTION -- Description of the analysis
- GFZ95P01.ERP -- Earth rotation parameters
- GFZ95P01.SSC -- Station coordinates
- GFZ95P02.SSC -- Station coordinates and velocities
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.
Tables 1 and 2 on the following pages summarize the full-rate data for 1994 archived in the CDDIS as of July 1995. Table 1 shows the total number of passes by system for each satellite tracked; Table 2 displays the total number of observations. All full-rate Version A data sets have been released; the latest B release of the 1994 full-rate data set is for the month of July.
Table 1. 1994 SLR Full-Rate Pass Totals (as of July 1995)
Site LAG-I LAG-II TOPEX ERS-1 METEOR-3 STAR STEL AJISAI GPS-35 GPS-36 FIZEAU MSTI-2 ETA-I ETA-II GLONASS
Name System Passes Passes Passes Passes Passes Passes Passes Passes Passes Passes Passes Passes Passes Passes Passes
-------------------- -------- ------ ------ ------ ------ -------- ------ ------ ------ ------ ------ ------ ------ ------ ------ -------
Arequipa TLRS-3 186 232 299 191 181 196 136 323 0 0 7 0 0 0 0
Bar Giyyora MOBLAS-2 30 51 57 66 37 67 57 91 0 0 0 0 0 0 0
Borowiec POLLAS 56 48 69 75 27 24 31 35 0 0 0 0 0 0 0
Cabo San Lucas TLRS-4 16 15 3 6 3 27 0 11 0 0 0 0 0 0 0
Cagliari CAGLAS 21 22 22 21 10 3 14 35 0 0 0 0 0 0 0
Changchun CHALAS 46 54 105 86 75 137 47 184 0 0 0 0 17 14 0
Easter Island TLRS-2 29 33 36 33 21 32 25 34 0 0 0 0 0 0 0
Ensenada TLRS-4 29 26 28 15 2 7 17 51 0 0 0 0 0 0 0
Evpatoria EVPLAS 15 8 0 11 3 0 0 0 1 0 0 0 0 4 0
Grasse GRASSE 166 117 239 351 154 210 112 242 0 0 0 0 0 0 0
Graz AUSLAS 161 124 207 186 75 127 88 199 37 2 0 0 34 39 0
Greenbelt MOBLAS-7 274 229 225 209 200 298 144 359 11 17 19 10 23 35 10
Haleakala HOLLAS 204 205 206 177 138 239 109 274 30 7 0 0 30 34 0
Helwan HELLAS 15 34 55 88 28 56 52 97 0 0 0 0 0 0 0
Herstmonceux RGOLAS 396 303 425 317 211 352 241 277 39 26 0 0 44 58 0
Katzively CRMLAS 5 0 0 0 0 0 0 0 0 0 0 0 3 2 0
Komsomolsk-Na-Amure KOMLAS 20 25 0 51 0 0 0 3 0 0 0 0 0 3 0
La Grande TLRS-4 26 16 16 16 28 2 8 3 0 0 0 0 0 0 0
Maidanak MD2LAS 50 17 0 72 28 0 0 0 6 0 0 0 41 43 0
Makura Saki HTLRS-1 0 0 5 0 0 0 0 20 0 0 0 0 0 0 0
Matera SAO-1 205 185 210 152 98 176 82 280 0 0 0 0 0 0 0
Matera TLRS-1 13 25 1 4 0 11 2 23 0 0 0 0 0 0 0
McDonald MLRS 182 180 281 157 145 167 96 314 21 12 7 0 15 16 0
Mendeleevo MENLAS 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0
Metsahovi FINLAS 20 16 66 61 63 17 33 66 0 0 0 0 0 0 0
Monument Peak MOBLAS-4 389 368 437 283 233 401 195 615 11 13 28 7 83 91 0
Oga HTLRS-1 2 0 1 0 0 0 0 25 0 0 0 0 0 0 0
Orroral NLRS 236 168 215 150 105 225 100 377 5 19 0 0 23 10 0
Punta Sa Menta TLRS-1 31 3 1 0 0 0 0 1 0 0 0 0 0 0 0
Potsdam GFZLAS 131 109 238 231 193 93 93 119 2 0 0 0 0 0 0
Quincy MOBLAS-8 320 255 369 245 191 360 160 386 11 5 5 12 44 25 0
Richmond TLRS-4 10 12 8 6 2 5 7 8 0 0 5 0 0 0 0
Riga RIGLAS 72 61 120 173 87 5 28 13 0 0 0 0 0 0 0
San Fernando SPNLAS 2 2 64 55 53 28 16 171 0 0 0 0 0 0 0
Santiago De Cuba CUBLAS 57 38 49 109 41 60 13 38 0 0 0 0 0 0 0
Sarapul SARLAS 0 0 0 3 5 0 0 0 0 0 0 0 0 0 0
Shanghai CHILAS 45 58 70 28 19 30 4 114 0 0 0 0 1 3 0
Simeiz SIMLAS 5 9 9 40 0 2 7 20 0 0 0 0 0 0 0
Simosato SHOLAS 43 51 66 21 17 33 31 200 0 0 0 0 0 0 0
Xrisokalaria TLRS-1 40 9 9 0 0 1 0 12 0 0 0 0 0 0 0
Wettzell WLRS 412 289 411 196 170 228 90 466 5 4 0 0 43 36 0
Wuhan WUHLAS 35 27 31 20 36 15 8 49 0 0 0 0 0 0 0
Yarragadee MOBLAS-5 556 482 497 394 318 432 304 669 37 16 0 2 98 86 0
Zimmerwald ZIMLAS 134 98 127 120 65 94 69 144 0 0 0 0 0 0 0
-------------------- --------- ------ ------ ------ ------ -------- ------ ------ ------ ------ ------ ------ ------ ------ ------ -------
Totals: 38 systems at 44 sites 4,685 4,004 5,277 4,425 3,062 4,160 2,419 6,348 216 121 71 31 499 499 10 Table 2. 1994 SLR Full-Rate Point Totals (as of July 1995)
Site LAGEOS-I LAGEOS-II TOPEX ERS-1 METEOR-3 STARLETTE STELLA AJISAI GPS-35 GPS-36 MSTI-2 FIZEAU ETALON-I ETALON-II GLONASS
Name System Obs. Obs. Obs. Obs. Obs. Obs. Obs. Obs. Obs. Obs. Obs. Obs. Obs. Obs. Obs.
-------------------- -------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
Arequipa TLRS-3 139,911 231,487 309,915 63,789 91,575 81,725 60,962 338,408 0 0 0 921 0 0 0
Bar Giyyora MOBLAS-2 17,043 53,573 53,676 29,414 15,973 38,714 30,890 68,050 0 0 0 0 0 0 0
Cabo San Lucas TLRS-4 11,751 22,129 4,062 6,111 5,676 27,248 0 17,785 0 0 0 0 0 0 0
Borowiec POLLAS 21,984 19,193 103,327 27,623 11,939 7,457 8,650 41,807 0 0 0 0 0 0 0
Cagliari CAGLAS 986 2,451 6,985 938 1,307 435 859 16,822 0 0 0 0 0 0 0
Changchun CHALAS 4,885 13,437 30,504 7,885 9,819 25,938 5,859 57,501 0 0 0 0 647 540 0
Easter Island TLRS-2 16,798 19,890 38,048 14,071 7,981 15,969 11,337 35,685 0 0 0 0 0 0 0
Ensenada TLRS-4 16,331 29,439 49,428 10,112 2,429 6,475 10,754 82,253 0 0 0 0 0 0 0
Evpatoria EVPLAS 1,072 647 0 824 186 0 0 0 27 0 0 0 0 142 0
Grasse GRASSE 159,902 157,229 297,423 136,914 86,494 137,252 51,445 321,594 0 0 0 0 0 0 0
Graz AUSLAS 774,558 639,172 540,839 223,044 120,388 201,406 158,241 531,832 16,366 360 0 0 54,315 38,735 0
Greenbelt MOBLAS-7 651,339 692,600 313,427 132,732 177,911 246,564 101,366 539,684 8,333 30,688 2,945 6,060 26,850 56,028 12,231
Haleakala HOLLAS 316,999 252,451 282,912 83,220 81,589 152,288 60,833 333,680 2,563 309 0 0 19,155 12,308 0
Helwan HELLAS 1,399 3,304 27,763 16,423 2,972 10,378 15,895 41,384 0 0 0 0 0 0 0
Herstmonceux RGOLAS 249,610 200,164 234,832 128,297 74,874 165,145 104,171 148,410 1,578 1,240 0 0 9,538 9,486 0
Katzively CRMLAS 1,314 0 0 0 0 0 0 0 0 0 0 0 216 82 0
Komsomolsk-Na-Amure KOMLAS 2,135 2,922 0 7,731 0 0 0 751 0 0 0 0 0 127 0
La Grande TLRS-4 37,177 16,715 10,632 8,681 24,730 1,677 6,999 4,750 0 0 0 0 0 0 0
Maidanak MD2LAS 26,533 8,528 0 11,718 5,159 0 0 0 261 0 0 0 8,331 5,635 0
Makura Saki HTLRS-1 0 0 917 0 0 0 0 2,314 0 0 0 0 0 0 0
Matera SAO-1 23,075 26,681 17,140 6,270 5,419 8,350 3,903 25,176 0 0 0 0 0 0 0
Matera TLRS-1 7,219 22,476 383 332 0 2,745 471 15,211 0 0 0 0 0 0 0
McDonald MLRS 159,368 151,259 359,779 51,223 73,778 72,598 35,459 350,983 15,518 7,900 0 1,474 5,117 4,071 0
Mendeleevo MENLAS 0 0 0 599 0 0 0 0 0 0 0 0 0 0 0
Metsahovi FINLAS 1,567 1,651 8,728 2,706 3,706 736 1,424 7,339 0 0 0 0 0 0 0
Monument Peak MOBLAS-4 939,036 1,024,331 679,492 192,297 196,186 314,264 154,518 987,594 655 1,363 1,437 13,268 97,235 69,988 0
Oga HTLRS-1 18 0 214 0 0 0 0 5,033 0 0 0 0 0 0 0
Orroral NLRS 322,540 332,485 343,718 71,692 72,592 162,997 64,293 669,916 10,198 18,485 0 0 24,772 13,401 0
Quincy MOBLAS-8 640,894 688,554 496,179 158,512 157,583 285,310 116,584 549,484 2,152 4,636 4,270 2,053 61,996 29,507 0
Potsdam GFZLAS 93,506 73,930 369,022 107,405 109,208 78,083 67,647 167,886 210 0 0 0 0 0 0
Punta Sa Menta TLRS-1 16,208 818 935 0 0 0 0 46 0 0 0 0 0 0 0
Richmond TLRS-4 14,152 22,938 11,198 4,866 2,234 2,362 5,224 14,167 0 0 0 950 0 0 0
Riga RIGLAS 88,708 147,157 215,039 95,748 72,151 3,430 17,040 17,669 0 0 0 0 0 0 0
San Fernando SPNLAS 30 436 85,635 19,379 25,721 5,478 3,653 187,042 0 0 0 0 0 0 0
Santiago De Cuba CUBLAS 82,086 51,794 59,181 44,948 12,615 48,065 9,033 34,597 0 0 0 0 0 0 0
Sarapul SARLAS 0 0 0 188 422 0 0 0 0 0 0 0 0 0 0
Shanghai CHILAS 17,208 28,800 29,323 2,874 2,613 4,908 1,203 46,973 0 0 0 0 54 259 0
Simeiz SIMLAS 280 684 686 1,867 0 101 440 2,214 0 0 0 0 0 0 0
Simosato SHOLAS 54,560 84,393 69,109 13,590 6,658 21,585 16,152 236,496 0 0 0 0 0 0 0
Wettzell WLRS 776,266 608,216 787,137 120,348 178,168 221,602 64,492 924,033 2,854 205 0 0 51,957 27,210 0
Wuhan WUHLAS 4,490 3,758 15,972 1,644 10,773 3,037 795 19,870 0 0 0 0 0 0 0
Yarragadee MOBLAS-5 1,215,488 1,613,097 1,003,241 375,913 436,199 516,579 302,753 1,323,132 7,399 3,037 18 0 118,724 75,804 0
Xrisokalaria TLRS-1 14,746 2,312 4,205 0 0 315 0 1,539 0 0 0 0 0 0 0
Zimmerwald ZIMLAS 81,162 65,126 104,557 39,255 20,374 42,628 34,490 110,471 0 0 0 0 0 0 0
-------------------- -------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
Totals: 38 systems at 44 sites 7,004,334 7,316,227 6,965,563 2,221,183 2,107,402 2,913,844 1,527,835 8,279,581 68,114 68,223 8,670 24,726 478,907 343,323 12,231
The latest issue (June 1995) of the Satellite Laser Ranging Newsletter of the SLR Subcommission of the CSTG has been published and is available through the WWW. The newsletter is accessible through the Space Geodesy and Altimetry Projects (SGAPO) WWW home page (URL: http://cddis.gsfc.nasa.gov/920_1/SGAPO.html) or directly using the URL: http://cddis.gsfc.nasa.gov/920_1pubs//slrnews/9506/slrnews_9506.html.
As of August 1, 1995, the SLR on-site (or quick-look) data and directories for the ETALON and GLONASS satellites have been changed. Prior to that date, the data from both ETALON-I and -II were stored in a single daily file, under yearly subdirectories of the SLR_DATA:[SLRQL.ETALON] directory. After August 1, these data are stored in files by satellite, under separate directories (i.e., SLR_DATA:[SLRQL.ETALON1] and SLR_DATA:[SLRQL.ETALON2]. Similarly, all tracked GLONASS satellites are now stored in separate directories and files. This convention will more closely follow the storage structure established for the SLR full-rate data posting system.
Since the June 1995 issue of the CDDIS Bulletin, the CDDIS has archived data from the following new GPS tracking sites:
Table 3. New GPS Tracking Sites
Mon. Data
Name Site Name Source Receiver Type Start Date End Date
CAT1 Catalina Island, CA JPL Rogue SNR-8000 20-Jul-95 --
LHAS Lhasa, Peoples Republic of China IfAG/IGN Rogue SNR-8000 17-May-95 --
LPGS La Plata, Argentina GFZ Rogue SNR-8000 02-Jul-95 --
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