From Jim Mon Apr 20 12:49:17 1998 From: Jim (Jim) Date: Mon, 20 Apr 1998 12:49:17 PDT Subject: [IGSMAIL-1868] new AMCT site at Falcon Air Force Base Message-ID: ****************************************************************************** IGS Electronic Mail Mon Apr 20 12:49:17 PDT 1998 Message Number 1868 ****************************************************************************** Author: Jim Ray Subject: new AMCT site at Falcon Air Force Base A new GPS tracking site has been installed at the Falcon Air Force Base, near Colorado Springs, CO, USA, on the rooftop of Building 400. The geodetic reference point is the ARP rather than a conventional monument. Falcon AFB is the home of the GPS Operations Control Segment. The new station is named `AMCT' to indicate that its frequency standard is a 5 MHz signal from the steered H-maser which serves as the USNO Alternate Master Clock. AMC is kept closely aligned to UTC(USNO) via regular two-way satellite time transfer measurements. We intend to calibrate the clock offset from the H-maser to the GPS antenna in order to provide a direct link to the AMC time. The current antenna installation is not permanent because the mount is not sufficiently stable. However, data from the current installation is being disseminated to support data analysis and comparison efforts related to the IGS/BIPM timing project. The antenna will be moved when a more stable mount is installed. The NOAA GODC group has kindly assisted with the installation of this GPS receiver and will serve as the Regional Data Center for data distribution. We are, once again, very appreciative of the support that the NOAA group has provided. AMCT data will soon be available at CDDIS starting 25 March 1998. A copy of the Site Information Form is attached below. Jim Ray U.S. Naval Observatory ----------------------------------------------------------------------------- AMCT Site Information Form International GPS Service for Geodynamics 0. Form Prepared by (full name) : Bill Bollwerk, Jim Ray (USNO) Date Prepared : 20-APR-1998 Report Type : NEW Prepared Using : 1. Site Identification of the GPS Monument Site Name : Alternate Master Clock (timing test) Four Character ID : AMCT Monument Inscription : no monument, GPS antenna ARP IERS DOMES Number : 40472S003 CDP Number : none Date Installed : 24-MAR-1998 Geologic Characteristic : on roof of 5-story building Bedrock Type : Bedrock Condition : Fracture Spacing : Notes : Additional Information : The antenna is mounted on top of the roof (flat) of Building 400 (5 stories) at Falcon Air Force Base, outside of Colorado Springs, Colorado. There are no nearby geodetic markers or control points. 2. Site Location Information City or Town : Falcon Air Force Base, Colorado Springs State or Province : Colorado Country : U.S.A. Tectonic Plate : North American Approximate Position X coordinate (m) : -1248596.241 Y coordinate (m) : -4819429.589 Z coordinate (m) : 3976506.987 Latitude (deg) : 38.803114 N Longitude (deg) : 255.475405 E Elevation (m) : 1911.087 Additional Information : (multiple lines) 3. GPS Receiver Information 3.1 Receiver Type : TURBOROGUE SNR12 Serial Number : T247 Firmware Version : 3.2.32.1 Date Installed : 24-MAR-1998 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 : 308 Antenna Height (m) : 0.0 Antenna Reference Point : ARP Degree Offset from North : oriented North but not measured Antenna Radome Type : none Date Installed : 24-MAR-1998 Date Removed : (dd-MMM-yyyy hh:mm UT) Additional Information : This antenna is located 28.5 inches nearly directly north of the antenna for a TTR-4P timing receiver. NIMA surveyed the TTR-4P antenna location in August 1996 with the following results: 38 Degrees 48' 11.1860" N ( 38.803107222 N) 104 Degrees 31' 28.5435" W (255.475404583 E) 1911.087 m Ellipsoid Height with a stated accuracy of +/- 30 cm (1 sigma) in each component. The TurboRogue antenna is mounted at the same height level on the same T-bar as the TTR-4P antenna. 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 5.1 Monument Name : none Site Ref CDP Number : none Site Ref Domes Number : none 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) 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) 6. Frequency Standard 6.1 Standard Type : steered H-MASER Frequency : 5 MHz Effective Dates : 24-MAR-1998 Notes : reference signal from USNO Alternate Master Clock #1, the back-up realization of UTC(USNO) via two-way satellite time transfer; calibration of clock offset to be established later 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 7.1 Instrumentation Type : none Status : Effective Dates : Notes : 7.x Instrumentation Type : (DORIS/GLONASS/PRARE/SLR/VLBI) Status : (PERMANENT/MOBILE) 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) : Effective Dates : (dd-MMM-yyyy - dd-MMM-yyyy) Notes : (multiple lines) 8.2 Pressure Sensor Model : Manufacturer : Data Frequency : Accuracy (mbar) : Height Diff to GPS (m) : Effective Dates : (dd-MMM-yyyy - dd-MMM-yyyy) Notes : (multiple lines) 8.3 Temperature Sensor Model : Manufacturer : Data Frequency : Accuracy (deg C) : Effective Dates : (dd-MMM-yyyy - dd-MMM-yyyy) Notes : (multiple lines) 8.4 Water Vapor Radiometer : none 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 : The USNO Alternate Master Clock is located in the same building as this GPS receiver. The differential time offset between the Alternate Master Clock and the GPS antenna will be monitored and may be used to calibrate the receiver clock time directly to UTC(AMC). 9. On-Site, Point of Contact Agency Information Agency : U.S. Naval Observatory, Alternate Master Clock Mailing Address : USNO/AMC : 400 O'Malley Ave, Suite 44 : Falcon AFB, CO 80912-4044 Primary Contact Contact Name : Bill Bollwerk Telephone (primary) : 719-567-6740 Telephone (secondary) : 719-567-6763 Fax : E-mail : bill at tycho.usnogps.navy.mil Secondary Contact Contact Name : Paul Wheeler (USNO) Telephone (primary) : 202-762-1581 Telephone (secondary) : Fax : E-mail : paul at tsee2.usno.navy.mil Additional Information : Regional Data Center is NOAA GODC Regional Data Center Contact Contact Name : Linda Nussear (NOAA) Telephone (primary) : 301-713-2852 Telephone (secondary) : Fax : 301-713-4475 E-mail : linda at gracie.grdl.noaa.gov 10. Responsible Agency (if different from 9.) Agency : (same as above in 9.) 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 : N Site Diagram : N Horizon Mask : N Monument Description : no monument Site Pictures : N 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 <-- 0.381 --> ARP: Antenna Reference Point L1 : L1 Phase Center L2 : L2 Phase Center TCR: Top of Chokering BCR: Bottom of Chokering TGP: Top of Ground Plane BGP: Bottom of Ground Plane TPA: Top of Preamplifier BPA: Bottom of Preamplifier TOP: Top of Pole [Mailed From: Jim Ray (USNO 202-762-1444) ]