From: Steve Nerem Date: 08 Dec 1998 07:36:33 Subject: [IGEXMail-0108] MDOA IGEX Site Sender: owner-igexmail@ensg.ign.fr Precedence: bulk ****************************************************************************** IGEX Electronic Mail 08-Dec-1998 07:36:33 Message No 0108 ****************************************************************************** Author: Steve Nerem Subject: MDOA IGEX Site Dear colleagues, The Center for Space Research has installed a Javad Positioning Systems Legacy GPS/GLONASS dual-frequency receiver at an auxiliary site at McDonald Observatory, Fort Davis, TX, USA. The antenna is placed over an existing marker which has a pre-surveyed tie to MDO1. The log sheet is given below and will be posted at http://lareg.ensg.ign.fr/IGEX. The antenna characteristics of the Javad RegAnt have not been validated and the L1/L2 phase centers are taken from software that was distributed with the receiver. Please read the log file below for more information regarding the JPS RegAnt. (Also, please note that the antenna height given in both the Rinex Obs. files and the log file are to the antenna reference point as shown in the diagram at the bottom of the log file.) The receiver has been operational and collecting data since Nov 19, 1998. The rinex'ed data has been uploaded to the cddis / datain directory under the Rinex naming convention of SSSS = mdoa. Sincerely, Steve Nerem (nerem@csr.utexas.edu) Kevin W. Key (key@csr.utexas.edu) Bob E. Schutz (schutz@csr.utexas.edu) Center for Space Research Univeristy of Texas at Austin 3925 W. Braker Lane, Suite 200 Austin, TX 78759-5321 ------------------------------------------------------------------ MDOA Site Information Form GPS/GLONASS Campaign IGEX98 0. Form Prepared by (full name) : Kevin W. Key Date Prepared : 25-NOV-1998 Report Type : NEW Prepared Using : 1. Site Identification of the GPS/GLONASS Monument Site Name : McDonald Observatory Mobile VLBI and SLR mark Four Character ID : MDOA Monument Inscription : 7850-1988 IERS DOMES Number : 40442M008 CDP Number : Monument Description : BRASS PLATE Date Installed : 19-NOV-1998 19:00 UT Geologic Characteristic : Bedrock Type : Bedrock Condition : Fracture Spacing : Notes : Additional Information : This marker is a local tie to MDO1. See the MDO1.log from the IGS for more information. 2. Site Location Information City or Town : Fort Davis State or Province : Texas Country : USA Tectonic Plate : North American Approximate Position X coordinate (m) : -1330008.191 m Y coordinate (m) : -5328391.593 m Z coordinate (m) : 3236502.715 m Latitude (deg) : 30.6805 N Longitude (deg) : 255.9850 E Elevation (m) : 2004.505 m Additional Information : The position given above is the ITRF96 position at epoch 1997 as derived from the log file of MDO1. The velocity for this site can be taken as equivalent to MDO1. 3. Receiver Information 3.x Receiver Type : Javad Positioning Systems Legacy Satellite System : GPS+GLONASS Serial Number : MZX02363607 Firmware Version : MZX0000022 Date Installed : 19-NOV-1998 19:00 UT Date Removed : Additional Information : 4. Antenna Information 4.x Antenna Type : Javad Positioning Systems RegAnt Serial Number : MZX0000022 Antenna Height (m) : 1.0024 m Antenna Reference Point : ARP Degree Offset from North : Antenna Radome Type : Date Installed : 19-NOV-1998 15:00 UT Date Removed : Additional Information : The antenna type does not have a phase center calibration by Gerry Mader. The "Pinnacle" software included with the receiver/antenna states that the vertical distance from the antenna reference point to both the L1 and L2 phase centers is 0.0730 m. (See below for a diagram of the offset.) The total vertical offset for the station mark, for both L1 and L2 phase centers, is thus, 1.0754 m ( 1.0754m = 1.0024m + 0.0730m). 5. Local Site Ties 5.x Monument Name : McDonald VLBA Site (MDO1) Site Ref CDP Number : Site Ref Domes Number : 40442M012 Differential Components from GPS/GLONASS Marker to Site Reference (ITRS) dx (m) : 9.5212 dy (m) : -1.7953 dz (m) : 1.4841 Accuracy (mm) : Date Measured : 17-MAR-1993 UT Additional Information : This tie is from MDOA to MDO1 and is the negative of the tie given in the MDO1.log file. 6. Frequency Standard 6.1 Standard Type : INTERNAL - QUARTZ ? Frequency : Effective Dates : Notes : 7. Collocation Information 7.1 Instrumentation Type : GPS/GLONASS/SLR/VLBI Status : PERMANENT Effective Dates : Notes : Several local markers surround MDO1. 8. Meteorological Instrumentation 8.1 Humidity Sensor Model : Manufacturer : Data Frequency : Accuracy (% rel h) : Effective Dates : Notes : 8.2 Pressure Sensor Model : Manufacturer : Data Frequency : Accuracy (mbar) : Height Diff to Ant (m) : Effective Dates : Notes : 8.3 Temperature Sensor Model : Manufacturer : Data Frequency : Accuracy (deg C) : Effective Dates : Notes : 8.4 Water Vapor Radiometer : Manufacturer : Distance to Antenna (m): Elev Diff to Ant (m) : Effective Dates : Notes : 8.5 Other Instrumentation : 10. Responsible Agency (if different from 9.) Agency : Center For Space Research Mailing Address : University of Texas at Austin 3925 W. Braker Lane, Suite 200 Austin, TX 78759-5321 Primary Contact Contact Name : Steve Nerem Telephone (primary) : (512) 471 - Telephone (secondary) : (512) 471 - Fax : (512) 471 - 3570 E-mail : nerem@csr.utexas.edu Secondary Contact Contact Name : Kevin W. Key Telephone (primary) : (512) 471 - 7863 Telephone (secondary) : (512) 471 - Fax : (512) 471 - 3570 E-mail : key@csr.utexas.edu Additional Information : 11. More Information URL for More Information : Hardcopy on File Site Map : Y Site Diagram : Y Horizon Mask : Monument Description : Site Pictures : Y Additional Information : Javad Positioning Systems Antenna is encased in a hard plastic shell as shown below. The L1/L2 distances are taken from the JPS software "Pinnacle". This antenna is currently uncalibrated. Antenna Graphics with Dimensions +-------------------------+ <--------------Plastic Housing for / ------------------- \ Antenna/Choke Ring / / \ \ +---------+ | + | +---------+ <-- 0.0730 L1/L2 | +-------------------------------------------------+ | <-- 0.xxxx TCR / | | \ | | | | | | | | | | | | \+-----------------------------------------------------+/ |+-----------------------------------------------------+| <-- 0.xxxx BCR \______________ | | ______________/ \ | | / \+---------x---------+/ <-- 0.0000 ARP 12. Local Events Possibly Affecting Computed Position 12.x Date : (dd-MMM-yyyy hh:mm UT) Event : (multiple lines) ========================================================================= + Dr. R. Steven Nerem + + Dept. of Aerospace Engineering & Center for Space Research + + Engineering Mechanics, WRW313B 3925 W. Braker Lane, Suite 200 + + The University of Texas at Austin Austin, Texas 78759-5321 U.S.A. + + Austin, Texas 78712 U.S.A. Msg (512)471-5573 (CSR main line) + + Fax (512) 471-3788 Fax (512) 471-3570 + + Phone (Campus or CSR) (512) 471-5696 (voice mail) + + Email: nerem@csr.utexas.edu + =========================================================================