ASCENSION DORIS site description form 0. Form Prepared by : SIMB (DORIS installation and maintenance department) Date prepared : 13/07/2005 Report type : UPDATE 1. Site location information Site name : ASCENSION Site DOMES number : 30602 Host agency : ARIANE Tracking Station City : Ascension Island State or province : South Atlantic Ocean Country : UNITED KINGDOM (South Atlantic Ocean) Tectonic plate : Geological information : Geographical coordinates (ITRF) : North Latitude : -7 deg 54' 59'' East Longitude : -14 deg 19' 56'' Ellipsoid height : 39 m Approximate altitude : 2. DORIS antenna and reference point information 2.1 Four character ID : ASDB Antenna model : Starec 52291 type Antenna serial number : 89 IERS DOMES number : 30602S004 CNES/IGN number : 306022 CTDP number : 74 Date installed (dd/mm/yy): 28/02/1997 Date removed (dd/mm/yy) : Antenna support type : Concrete pillar (old STELLA antenna support) Installed on : Concrete pad Height above ground mark : 0.548 m Ground mark type : Domed brass mark 12 mm diameter Ground mark DOMES number : 30602M002 Notes : Starec 52291 type antenna number 58 removed on : 16/03/2003. 3. DORIS beacons information 3.1 Beacon serial number : 98 45 107 Beacon model : 2.0 USO serial number : 2.866 4 Char. ID of the REF point : ASDB Date installed (dd/mm/yy) : 09/04/1999 Date removed (dd/mm/yy) : 12/02/2002 3.2 Beacon serial number : 99 04 130 Beacon model : 2.0 USO serial number : 3.152 4 Char. ID of the REF point : ASDB Date installed (dd/mm/yy) : 09/04/2002 Date removed (dd/mm/yy) : 18/05/2004 3.3 Beacon serial number : 99 04 121 Beacon model : 2.0 USO serial number : 3.130 4 Char. ID of the REF point : ASDB Date installed (dd/mm/yy) : 19/05/2004 Date removed (dd/mm/yy) : 30/03/2005 3.4 Beacon serial number : 28 19 052 Beacon model : 3.0 USO serial number : 3.405 4 Char. ID of the REF point : ASDB Date installed (dd/mm/yy) : 01/04/2005 Date removed (dd/mm/yy) : 4. ITRF coordinates and velocities of the current DORIS ref. point (ASDB) Solution : ITRF2000 Epoch : 1997.0 X = 6121161.551 m Y = -1563943.209 m Z = -872613.095 m Sig X = 0.005 m Sig Y = 0.003 m Sig Z = 0.003 m VX = -0.0025 m/y VY = -0.0048 m/y VZ = 0.0102 m/y Sig VX = 0.0015 m/y Sig VY = 0.0007 m/y Sig VZ = 0.0004 m/y 5. IERS colocation information 5.1 Instrument type : GPS Status : Permanent DOMES number of the instrument ref. point : 30602M001 Notes : Tie measured 03/1997 6. Tide Gauge colocation information 6.1 Name : Ascension Is. Location : English Cove GLOSS number : 263 Distance : 6.5 km Notes : Tie measured 03/1997 7. Local site ties 7.1 Point description : Mark under the DORIS antenna DOMES number : 30602M002 Differential components from the current DORIS ref. point (ASDB) to the above point (in the ITRS) : dX (m) : -0.526 dY (m) : 0.134 dZ (m) : 0.076 Accuracy (m) : 0.001 Date measured : March 1997 & 2003 Additional information : Survey by IGN-F 7.2 Point description : IGS station ASC1 (plate on I-beam) DOMES number : 30602M001 Differential components from the current DORIS ref. point (ASDB) to the above point (in the ITRS) : dX (m) : -2635.486 dY (m) : -8401.480 dZ (m) : -3838.070 Accuracy (m) : 0.002 Date measured : March 1997 & 2003 Additional information : Survey by IGN-F 7.3 Point description : English Bay / tide gauge/POL18 mark (2003 survey) DOMES number : Differential components from the current DORIS ref. point (ASDB) to the above point (in the ITRS) : dX (m) : -1132.194 dY (m) : -5793.768 dZ (m) : 2562.524 Accuracy (m) : 0.005 Date measured : March 1997 Additional information : Survey by IGN-F 7.4 Point description : English Bay / tide gauge/POL18 mark (1997 survey) DOMES number : Differential components from the current DORIS ref. point (ASDB) to the above point (in the ITRS) : dX (m) : -1132.240 dY (m) : -5793.883 dZ (m) : 2562.596 Accuracy (m) : 0.003 Date measured : March 2003 Additional information : Survey by IGN-F 7.5 Point description : English Bay / tide gauge/POL18 mark (1997 survey) DOMES number : Differential components from the current DORIS ref. point (ASDB) to the above point (in the ITRS) : dX (m) : -1783.140 dY (m) : -7483.406 dZ (m) : 920.985 Accuracy (m) : 0.005 Date measured : March 1997 Additional information : Survey by IGN-F 8. Meteorological Instrumentation 8.1 Humidity sensor Model : SMP35D Manufacturer : VAISALA Accuracy : +/- 5 percents Notes : 8.2 Pressure sensor Model : PTB202 Manufacturer : VAISALA Accuracy : +/- 0.5 mb Height : 1.9 m above the current DORIS ref. point (ASDB) Notes : long term stability = +/- 0.2 mb/year 8.3 Temperature sensor Model : SMP35D Manufacturer : VAISALA Accuracy : +/- 0.25 deg C Notes : 9. DORIS network contacts Primary contact: Name : Herve FAGARD Agency : Institut Geographique National Mailing address : Service de Geodesie et de Nivellement : 2 Avenue PASTEUR : 94165 SAINT-MANDE CEDEX FRANCE Telephone : + 33 1 43 98 81 48 Fax : + 33 1 43 98 84 50 E-mail : herve (.) fagard (@) ign.fr Secondary contact: Name : Francois BOLDO Agency : Institut Geographique National Mailing address : CNES (ED/AL/MA) : 18 Avenue Edouard BELIN : 31401 TOULOUSE Cedex FRANCE Telephone : + 33 5 61 27 40 72 Fax : + 33 5 61 28 25 95 E-mail : Simb.Doris@cnes.fr