From: Tom Clark (NASA/GSFC) Subject: [IGSMAIL-0468] St. Croix (CRO1) GPS Date: Tue, 1 Feb 1994 10:01:51 PST ****************************************************************************** IGS Electronic Mail Tue Feb 1 10:01:51 PST 1994 Message Number 0468 ****************************************************************************** Author: Tom Clark (NASA/GSFC) Subject: St. Croix (CRO1) GPS Subject: St. Croix (CRO1) GPS In early January, Mark Bryant made the trek to St. Croix, US Virgin Islands (hardship duty to leave the Washington DC area in January!) to install a TurboRogue at the St. Croix VLBI station in support of the January CONT94 VLBI campaign and the February Caribbean and South American DOSE invest- igations. The installation is a "standard" NASA FLINN/IGS concrete pier designed for permanent, long-term use. Site survey ties have not yet been done, but I have attached the standard IGS site information form which Mark prepared for me. Geoff Blewitt and I have an approved DOSE investigation to install permanent FLINN GPS receivers at all ten VLBA sites. The first two such sites (which have been operational for some time) were Pie Town (New Mexico) and North Liberty (Iowa). Unfortunately NASA Headquarters has made the decision that these first two sites will be the only ones so equipped. St. Croix, Mauna Kea (Hawaii) and Brewster (Washington) are the next on the priority list that Geoff and I established. Thus the St. Croix installation must be regarded as only temporary. Ruth Neilan and Steve Dinardo put forth super-human efforts to make a receiver available for a couple of months, but current plans call for St. Croix to leave the air the end of February. If you find it desirable to have St. Croix (or any of the other VLBA sites) implemented with permanent receivers, please let Geoff and me know. It would also be useful for you to make your desires known to John LaBrecque at NASA Headquarters ( jlabrecq@mtpe.hq.nasa.gov ). / o / -------------------- >< -------- cut here ---------------------- o \ \ ********************************** SITE INFORMATION FORM ********************************** 0. Form Prepared by (full name): Dr. Thomas A. Clark Space Geodesy Branch Code 926.9 NASA Goddard Space Flight Center Greenbelt MD 20771 clark@tomcat.gsfc.nasa.gov Date : February 1, 1994 Report type : New (NEW or UPDATE) 1. Site Identification of the GPS monument Site Name : St. Croix VLBA 4 char ID : CRO1 Monument Inscription : St. Croix VLBA RM 1 IERS DOMES Number : none assigned yet CDP Number : JPL 4023 Date : 1994 Additional information : The monument is a 0.457m diameter stainless steel plate set in a 0.762m diameter concrete monolith that projects 0.635m above grade. The monument is located approximately 82m northwest of the 25m VLBA antenna. 2. Site Location City : Christiansted Country : United States Virgin Islands (USA) Tectonic Plate : Caribbean Additional information : The site is located at the NRAO VLBA facility on the northeast tip of St. Croix. 3. GPS Receiver Type : TurboRogue SNR-8000 Serial Number : T-133 Firmware Version : 2.8 Date : 4. GPS Antenna Type : Dorn-Margolin T Serial Number : 133 Date : Vertical Antenna Height: 6.14 cm Antenna Reference Point: bottom of pre-amp Date : January 16, 1994 5. Local Site Ties Monument CDP DOMES Components Accuracy Date Name Number Number dX dY dZ mm yy-mm-dd ............ ....... ........ ........ ........ ........ .. .. .. .. ............ ....... ........ ........ ........ ........ .. .. .. .. ............ ....... ........ ........ ........ ........ .. .. .. .. Differential coordinates from the GPS monument to the reference and other monuments. The components are parallel to the XYZ-axes of the global geocentric reference system ITRF (WGS-84). Site ties currently not available. "Accuracy" is estimated accuracy of local survey (millimeters). 6. Frequency standard H-maser / x / Cesium / / Quartz / / Internal / / Other (specify) : Date : January 12, 1994 (Mark with 'X') 7. Collocation SLR / / VLBI /x / DORIS / / PRARE / / Other GEOPHYSICAL Instrumentation (specify) : Other (specify) : (Mark with 'P' for permanent, 'M' for mobile collocation) 8. On-site, Point of Contact Agency Information Agency : National Radio Astronomy Observatory (NRAO) Contact : John Williams/Ronald Lindsey Address : NRAO St. Croix VLBA Station P.O. Box 24878 Gallows Bay Station, Christiansted St. Croix, USVI 00824-0878 Telephone : (809) 773-4448 E-mail : vlbasc@vlbacc.nrao.edu Fax : 9. Responsible Operations Agency (if different from item 8) Agency : JPL Contact : Steve Dinardo Address : 4800 Oak Grove Drive Pasadena, CA 91109 Telephone : (818) 354-3429 E-mail : sjd@logos.jpl.nasa.gov Fax : (818) 393-4965 10. Please insert here the character graphics corresponding to the antenna type. TurboRogue: DORNE MARGOLIN T ----- / + \ <-- 0.128 L2 | + | <-- 0.110 L1 +--------------------------------------------------+ <-- 0.102 TCR | | | | | | | | +-+--------------------------------------------------+-+ <-- 0.038 +-------------------+-------------+--------------------+ <-- 0.035 BCR | | =| | +------x------+ <-- 0.000 ARP <-- 0.381 --> 11. Hard copy information Please mark 'X' if on file or date expected to be available. Site Map : x Site Diagram : x Horizon Mask : 1994 Monument description : x Site pictures : x ----------------------- END ----------------------------