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[IGEXMail-0108] MDOA IGEX Site
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IGEX Electronic Mail 08-Dec-1998 07:36:33 Message No 0108
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Author: Steve Nerem <nerem @ csr.utexas.edu>
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 +
=========================================================================