GODE Site Information Form International GPS Service for Geodynamics 0. Form Prepared by (full name) : Dr. Thomas A. Clark Date Prepared : 20-JUL-1993 Report Type : New Prepared Using : 1. Site Identification of the GPS Monument Site Name : GGAO (Greenbelt) Four Character ID : GODE Monument Inscription : See Item 5. IERS DOMES Number : 40451M123 CDP Number : JPL 4006 Date Installed : 1993 hh:mm UT Geologic Characteristic : (BEDROCK/CLAY/CONGLOMERATE/GRAVEL/SAND/etc) Bedrock Type : (IGNEOUS/METAMORPHIC/SEDIMENTARY) Bedrock Condition : (FRESH/JOINTED/WEATHERED) Fracture Spacing : (1-10 cm/10-50 cm/50-200 cm/over 200 cm) Notes : (multiple lines) Additional Information : See Question #5 2. Site Location Information City or Town : Goddard Space Flight Center, Greenbelt State or Province : Maryland Country : USA Tectonic Plate : NOAM Approximate Position X coordinate (m) : 1130773.9017 Y coordinate (m) : -4831253.5821 Z coordinate (m) : 3994200.3971 Latitude (deg) : 39.0217 Longitude (deg) : -76.8268 Elevation (m) : 15.5272 Additional Information : 3. GPS Receiver Information 3.1 Receiver Type : ROGUE SNR-8000 Serial Number : 129 Firmware Version : Date Installed : APR-1993 hh:mm UT Date Removed : (dd-MMM-yyyy hh:mm UT) Additional Information : (multiple lines) 3.x Receiver Type : Serial Number : Firmware Version : Date Installed : (dd-MMM-yyyy hh:mm UT) Date Removed : (dd-MMM-yyyy hh:mm UT) Additional Information : (multiple lines) 4. GPS Antenna Information 4.1 Antenna Type : DORNE MARGOLIN T Serial Number : 129 Antenna Height (m) : See Question #5 Antenna Reference Point : ARP Degree Offset from North : Antenna Radome Type : Date Installed : APR-1993 hh:mm UT Date Removed : (dd-MMM-yyyy hh:mm UT) Additional Information : (multiple lines) 4.x Antenna Type : Serial Number : Antenna Height (m) : (m) Antenna Reference Point : (ARP/BCR/BPA) Degree Offset from North : Antenna Radome Type : Date Installed : (dd-MMM-yyyy hh:mm UT) Date Removed : (dd-MMM-yyyy hh:mm UT) Additional Information : (multiple lines) 5. Local Site Ties 5.x Monument Name : Site Ref CDP Number : (XXXX) Site Ref Domes Number : (XXXXXXXXX) Differential Components from GPS Mark to Site Reference (ITRS) dx (m) : (m) dy (m) : (m) dz (m) : (m) Accuracy (mm) : (mm) Date Measured : (dd-MMM-yyyy hh:mm UT) Additional Information : (multiple lines) The following is extracted from IGSMAIL #233: *********************************************************************** IGS Electronic Mail 3-APR-1993 17:00:57 Message Number 233 *********************************************************************** From: T. Clark Subj: Goddard FLINN GPS on the air ------------------------------------- Today, April 2, 1993 we began GPS observations from the NASA/Goddard FLINN site using a TURBOROGUE (s/n 129). The site is still being developed and we have no telephone yet, so data will be hand-carried on floppy disks for posting to the community. The Goddard site is at GGAO, the Goddard Geophysical and Astronomical Observatory. Many of you know the site under its old name GORF (Goddard Optical Research Facility) -- we changed the name to reflect the multi- disciplinary nature of the site. But old habits die slowly and the GORF name is still frequently used. Data should start appearing early next week on CDDIS. We solicit comments and feedback on its quality. --------------------------------------------- SITE INFORMATION: Over the past several months, we have been developing new capabilities at GORF=GGAO. A previously unused area at the site has been earmarked for the radio geodetic activities. The MV-3 VLBI system will be moved to a new location (SGP 7108) in a couple of weeks, and two GPS monuments (JPL 4006 = GODE and JPL 4005 = GODW ) have been fabricated (GOD stands for GODdard and E/W stands for East/West). The new GODE pier is a fairly conventional FLINN monument -- a concrete cylinder going down about 4M in depth -- differing from the standard design (i.e. Santiago) only in the diameter (30 inches vs. 18 inches) of the concrete. The larger diameter was chosen to further suppress the "back-side" antenna radiation to minimize multipath. The GODE pier is about 50 cm above ground level. It has been outfitted with a standard ROGUE DORNE MARGOLIN antenna with the base reference plane 6.14 cm above the marker reference plate, using standard mounting hardware and stainless steel plate supplied by JPL. {note -- the previous sentence changed from IGSMAIL #233 to correct minor error} The GODW monument is not yet in use -- it is intended to test some ideas I have on how to suppress multipath; the reference point and stainless steel plate are only a few cm high. Yet to be installed is an absorber pad made of ordinary asphault surrounding the monument (rather like the situation at Yaragadee). The two new sites were chosen to provide a nearly optimum horizon mask. Both GODE and GODW can observe down to about 10 degrees elevation in most directions. The TURBOROGUE was showing good lock this afternoon on satellites as low as 6 degrees elevation. Detailed site descriptions for the GORF=GGAO site are in the CDP (now SGP = Space Geodesy Project) site catalog. For details, contact Mark Bryant (bryant@cddis.gsfc.nasa.gov). --------------------------------------------- GEODETIC CONTROL INFORMATION: The new GPS and VLBI monuments have been surveyed into the extensive existing GORF=GGAO network of monuments using conventional techniques by Vaughn Nelson and the crew at AlliedSignal (formerly called Bendix). Vaughn then adjusted the entire network using HAVAGO and provided the following data. I have chosen to report on only a subset of the HAVAGO adjustment for sites I deem relevant. I have included the major monuments currently in active geodetic use, including the North and South GEOS piers that at a part of the US FGCC (Federal Geodetic Control Commission) test range. ********** GORF 1993 HAVAGO ADJUSTMENT ************ IERS LAT = W.LONG= "OFFICIAL" 40451 39deg + 76deg + MARKER DOMES Comment 01min + 49min + HEIGHT NAME ## SS.SSSSS SS.SSSSS METERS -------------------- ---- ------- -------- -------- ------ CDP 7102 M123 MV-3 VLBI 14.36504 41.05487 19.206 CDP 7103 M103 14.59254 41.05272 19.198 CDP 7105 M105 MOB-7 SLR 14.14893 39.69092 20.441 CDP 7106 M113 48" SLR 17.32755 42.22103 20.601 CDP 7125 M114 12.94027 38.80242 19.756 CDP 7920 (7125-B) M117 12.89761 38.97513 19.758 CDP 7918 M120 14.55636 40.22590 19.956 NORTH GEOS 1979 M110 GORF FGCC 15.40525 38.95255 20.215 SOUTH GEOS PIER 1976 (none) also FGCC 12.60829 38.93431 20.114 GODDARD 1962 (none) 14.74859 40.57937 19.279 GODDARD 2 (none) 15.78174 39.86318 18.529 GORF 1989 (none) 12.75846 39.67755 19.598 JPL 4006 (GODE GPS) NEW GPS EAST 18.18985 36.57690 15.756 JPL 4005 (GODW GPS) NEW GPS WEST 17.99260 37.50555 15.489 SGP 7108-1993 NEW VLBI MV-3 18.90468 35.54401 14.993 In the following, the columns labeled "NAD 83" HAVAGO represent the data from the HAVAGO adjustment. A quick conversion to ITRF 91 has been made by adjusting the NAD 83 coordinates by the [XYZ] offsets between the HAVAGO output and the ITRF 91 position of the MV-3 VLBI system on marker 7102 as given on page 85 of the ITRF 91 report (IERS Technical note 12 by Boucher, Altamimi and Duhem), X=+1130686.684, Y=-4831353.012 and Z=+3994110.909 meters. --------- NAD 83 HAVAGO -------- -- HAVAGO SHIFTED TO ITRF 91 -- "OFFICIAL" -- RELATIVE TO CDP 7102 VLBI -- MARKER -- X -- -- Y -- -- Z -- -- X -- -- Y -- -- Z -- NAME +1130000+ -4831000+ +3994000+ +1130000+ -4831000+ +3994000+ -------------------- ------- ------- ------- ------- ------- ------- CDP 7102 687.018 -354.478 111.041 686.684 -353.012 110.909 CDP 7103 686.061 -350.159 116.487 685.727 -348.693 116.355 CDP 7105 720.141 -352.021 106.641 719.807 -350.555 106.509 CDP 7106 646.843 -305.920 182.897 646.509 -304.454 182.765 CDP 7125 746.179 -369.482 77.252 745.845 -368.016 77.120 CDP 7920 (7125-B) 742.322 -371.236 76.231 741.988 -369.770 76.099 CDP 7918 705.722 -346.885 116.097 705.388 -345.419 115.965 NORTH GEOS 1979 731.837 -324.052 136.598 731.503 -322.586 136.466 SOUTH GEOS PIER 1976 744.622 -376.751 69.524 744.288 -375.285 69.392 GODDARD 1962 696.472 -344.676 120.277 696.138 -343.210 120.145 GODDARD 2 708.543 -320.651 144.557 708.209 -319.185 144.425 GORF 1989 726.457 -377.596 72.797 726.123 -376.130 72.665 JPL 4006 (GODE GPS) 774.371 -255.013 200.506 774.037 -253.547 200.374 JPL 4005 (GODW GPS) 753.445 -263.631 195.611 753.111 -262.165 195.479 SGP 7108-1993 795.266 -235.260 217.151 794.932 -233.794 217.019 6. Frequency Standard 6.1 Standard Type : H-MASER Frequency : Effective Dates : dd-AUG-1993 - dd-MMM-yyyy Notes : (multiple lines) 6.x Standard Type : (H-MASER/CESIUM/QUARTZ/INTERNAL/RUBIDIUM) Frequency : Effective Dates : (dd-MMM-yyyy - dd-MMM-yyyy) Notes : (multiple lines) 7. Collocation Information 7.x Instrumentation Type : SLR/VLBI Status : PERMANENT Effective Dates : (dd-MMM-yyyy - dd-MMM-yyyy) Notes : (multiple lines) 8. Meteorological Instrumentation 8.1 Humidity Sensor Model : Manufacturer : Data Frequency : Accuracy (% rel h) : (% rel h) Effective Dates : (dd-MMM-yyyy - dd-MMM-yyyy) Notes : (multiple lines) 8.2 Pressure Sensor Model : Manufacturer : Data Frequency : Accuracy (mbar) : (mbar) Height Diff to GPS (m) : (m) Effective Dates : (dd-MMM-yyyy - dd-MMM-yyyy) Notes : (multiple lines) 8.3 Temperature Sensor Model : Manufacturer : Data Frequency : Accuracy (deg C) : (deg C) Effective Dates : (dd-MMM-yyyy - dd-MMM-yyyy) Notes : (multiple lines) 8.4 Water Vapor Radiometer : Manufacturer : Distance to GPS (m) : (m) Elev Diff to GPS (m) : (m) Effective Dates : (dd-MMM-yyyy - dd-MMM-yyyy) Notes : (multiple lines) 8.5 Other Instrumentation : (multiple lines) 9. On-Site, Point of Contact Agency Information Agency : NASA Goddard Space Flight Center Mailing Address : Space Geodesy Branch, Code 926.9 : NASA/GSFC : Greenbelt, MD 20771 Primary Contact Contact Name : Dr. Thomas A. Clark Telephone (primary) : 301-286-5957 Telephone (secondary) : Fax : 301-286-4943 E-mail : clark@tomcat.gsfc.nasa.gov Secondary Contact Contact Name : Telephone (primary) : Telephone (secondary) : Fax : E-mail : Additional Information : (multiple lines) 10. Responsible Agency (if different from 9.) Agency : (multiple lines) Mailing Address : (multiple lines) Primary Contact Contact Name : Telephone (primary) : Telephone (secondary) : Fax : E-mail : Secondary Contact Contact Name : Telephone (primary) : Telephone (secondary) : Fax : E-mail : Additional Information : (multiple lines) 11. More Information URL for More Information : Hardcopy on File Site Map : x Site Diagram : x Horizon Mask : (not sure about GODE) Monument Description : x Site Pictures : x Additional Information : (multiple lines) Antenna Graphics with Dimensions TURBOROGUE: DORNE MARGOLIN T ----- / + \ <-- 0.128 L2 | + | <-- 0.110 L1 +--------------------------------------------------+ <-- 0.102 TCR | | | | | | | | +-+--------------------------------------------------+-+ <-- 0.038 +-------------------+-------------+--------------------+ <-- 0.035 BCR | | | | +----+-x-+----+ ------------ <-- 0.000 ARP | | | | | | | | "Spike" | | 6.14 cm \ / | \ / | V | Stainless-steel =====================X======================== plate in concrete pier. "X" is survey reference point. <-- 0.381 --> ARP: Antenna Reference Point L1 : L1 Phase Center L2 : L2 Phase Center TCR: Top of Chokering BCR: Bottom of Chokering