Subject: [IGEXMail-0108] MDOA IGEX Site
From: Steve Nerem <[email-masked]>
Date: 08 Dec 1998 07:36:33

Sender: [email-masked]
Precedence: bulk

******************************************************************************
IGEX Electronic Mail    08-Dec-1998 07:36:33                   Message No 0108
******************************************************************************

Author: Steve Nerem <[email-masked]>
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   ([email-masked])
Kevin W. Key  ([email-masked])
Bob E. Schutz ([email-masked])

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                 : [email-masked]
     Secondary Contact
       Contact Name           : Kevin W. Key
       Telephone (primary)    : (512) 471 - 7863
       Telephone (secondary)  : (512) 471 -
       Fax                    : (512) 471 - 3570
       E-mail                 : [email-masked]
     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: [email-masked]                       +
=========================================================================