{ "cdp_num": null, "comment": "centre of top of bolt through steel railing,\r\nNE corner of liftshaft roof, Building 2.\r\nNote that the same receiver was previously\r\nused for different monuments as listed here -\r\n20-AUG-1997-07-SEP-1998, used unlabelled\r\nmonument\r\n07-SEP-1998 - 15-AUG-2000, moved to monument\r\nNPLB 13234M002.\r\n15-AUG-2000 - present, moved to monument\r\nNPLD 13234M003.", "conditions": [ { "comments": "Copper dome with 2m radius has centre ~10m\r\nWest of NPLD.", "date_from": "2000-08-15 00:00:00", "date_to": null, "type": "multipath_sources: METAL DOME" } ], "country": "United Kingdom of Great Britain and Northern Ireland", "country_code_ISO": "GBR", "date_from": "2000-08-15 12:00:00", "date_to": "2007-12-15 00:00:00", "description": null, "geological": { "bedrock": { "condition": null, "type": null }, "characteristic": null, "distance_to_fault": null, "fault_zone": "NO", "fracture_spacing": null }, "iers_domes": "13234M003", "instrument_collocation": [ { "comment": "Two-way satellite time and frequency\r\nearth station, NPL1.", "date_from": "1997-08-20 00:00:00", "date_to": null, "status": "PERMANENT", "type": "TWSTFT" }, { "comment": "NPLC\/NPLE IGEX station, 3SNAV R100-40T with\r\nTSA-100 3S CR.", "date_from": "1998-10-21 00:00:00", "date_to": "2001-07-20 00:00:00", "status": "PERMANENT", "type": "GLONASS" } ], "local_ties": [], "location": { "city": "Teddington", "coordinates": { "X": 3985500.414, "Y": -23625.493, "Z": 4962941.695, "altitude": 72.7, "lat": 51.42097988554975, "lon": -0.33963745058043404 }, "country": "United Kingdom of Great Britain and Northern Ireland", "country_iso_code": "GBR", "description": "This location estimate is from Gipsy on\r\nNPLD3400.00O.\r\nThe antenna offset has been added.\r\nPrevious NPLB 13234M002 monument position:\r\n3985502.5969, -23625.5546, 4962941.9106", "state": "Greater London", "tectonic": { "plate_name": "EURASIAN" } }, "logs": { "contact": "Mr. Peter Whibberley", "date": "2007-12-14 00:00:00", "log_type": "UPDATE", "modified": "UNAVAILABLE", "previous": "UNAVAILABLE", "title": "NPLD00GBR.xml" }, "marker": "NPLD", "monument": { "description": "STEEL BOLT", "foundation": "ROOF", "foundation_depth": null, "height": null, "monument_inscription": "NPLD" }, "monument_num": 0, "name": "Teddington", "receiver_num": 0, "station_contacts": [ { "contact": { "agency": { "abbreviation": "NPL", "address": "Hampton Road\nTW11 0LW Teddington\nUnited Kingdom of Great Britain and Northern Ireland (the)", "infos": "", "name": "National Physical Laboratory", "www": "" }, "comment": "", "email": "peter.whibberley@npl.co.uk", "name": "Mr. Peter Whibberley", "phone": "+44 20 8943 6746", "role": "site_owner", "title": "" } }, { "contact": { "agency": { "abbreviation": "NPL", "address": "Hampton Road\nTW11 0LW Teddington\nUnited Kingdom of Great Britain and Northern Ireland (the)", "infos": "", "name": "National Physical Laboratory", "www": "" }, "comment": "", "email": "peter.whibberley@npl.co.uk", "name": "Mr. Peter Whibberley", "phone": "+44 20 8943 6746", "role": "metadata_custodian", "title": "" } } ], "station_items": [ { "item": { "comment": "Prior to March 2004, receiver was listed as\r\nASHTECH Z-XII3 in site logs, but receiver\r\nwas an ASHTECH Z-XII3T", "contact_as_owner": { "agency": { "abbreviation": "NPL", "address": "Hampton Road\nTW11 0LW Teddington\nUnited Kingdom of Great Britain and Northern Ireland (the)", "infos": "", "name": "National Physical Laboratory", "www": "" }, "comment": "", "email": "peter.whibberley@npl.co.uk", "name": "Mr. Peter Whibberley", "phone": "+44 20 8943 6746", "role": "site_owner", "title": "" }, "contact_as_producer": { "agency": { "abbreviation": "NPL", "address": "Hampton Road\nTW11 0LW Teddington\nUnited Kingdom of Great Britain and Northern Ireland (the)", "infos": "", "name": "National Physical Laboratory", "www": "" }, "comment": "", "email": "peter.whibberley@npl.co.uk", "name": "Mr. Peter Whibberley", "phone": "+44 20 8943 6746", "role": "metadata_custodian", "title": "" }, "date_from": "1997-08-20 12:00:00", "date_to": "2003-07-03 12:00:00", "item_attributes": [ { "attribute": { "name": "receiver_type" }, "date_from": "1997-08-20 12:00:00", "date_to": "2003-07-03 12:00:00", "value_date": null, "value_numeric": null, "value_varchar": "ASHTECH Z-XII3T" }, { "attribute": { "name": "serial_number" }, "date_from": "1997-08-20 12:00:00", "date_to": "2003-07-03 12:00:00", "value_date": null, "value_numeric": null, "value_varchar": "LP0Z962" }, { "attribute": { "name": "satellite_system" }, "date_from": "1997-08-20 12:00:00", "date_to": "2003-07-03 12:00:00", "value_date": null, "value_numeric": null, "value_varchar": "GPS" }, { "attribute": { "name": "firmware_version" }, "date_from": "1997-08-20 12:00:00", "date_to": "2003-07-03 12:00:00", "value_date": null, "value_numeric": null, "value_varchar": "1I08" }, { "attribute": { "name": "elevation_cutoff_setting" }, "date_from": "1997-08-20 12:00:00", "date_to": "2003-07-03 12:00:00", "value_date": null, "value_numeric": 0, "value_varchar": null }, { "attribute": { "name": "temperature_stabilization" }, "date_from": "1997-08-20 12:00:00", "date_to": "2003-07-03 12:00:00", "value_date": null, "value_numeric": 2, "value_varchar": null } ], "item_type": { "name": "receiver" } } }, { "item": { "comment": "Prior to March 2004, receiver was listed as\r\nASHTECH Z-XII3 in site logs, but receiver\r\nwas an ASHTECH Z-XII3T", "contact_as_owner": { "agency": { "abbreviation": "NPL", "address": "Hampton Road\nTW11 0LW Teddington\nUnited Kingdom of Great Britain and Northern Ireland (the)", "infos": "", "name": "National Physical Laboratory", "www": "" }, "comment": "", "email": "peter.whibberley@npl.co.uk", "name": "Mr. Peter Whibberley", "phone": "+44 20 8943 6746", "role": "site_owner", "title": "" }, "contact_as_producer": { "agency": { "abbreviation": "NPL", "address": "Hampton Road\nTW11 0LW Teddington\nUnited Kingdom of Great Britain and Northern Ireland (the)", "infos": "", "name": "National Physical Laboratory", "www": "" }, "comment": "", "email": "peter.whibberley@npl.co.uk", "name": "Mr. Peter Whibberley", "phone": "+44 20 8943 6746", "role": "metadata_custodian", "title": "" }, "date_from": "2003-07-03 12:00:00", "date_to": "2007-12-15 00:00:00", "item_attributes": [ { "attribute": { "name": "receiver_type" }, "date_from": "2003-07-03 12:00:00", "date_to": "2007-12-15 00:00:00", "value_date": null, "value_numeric": null, "value_varchar": "ASHTECH Z-XII3T" }, { "attribute": { "name": "serial_number" }, "date_from": "2003-07-03 12:00:00", "date_to": "2007-12-15 00:00:00", "value_date": null, "value_numeric": null, "value_varchar": "LP0Z962" }, { "attribute": { "name": "satellite_system" }, "date_from": "2003-07-03 12:00:00", "date_to": "2007-12-15 00:00:00", "value_date": null, "value_numeric": null, "value_varchar": "GPS" }, { "attribute": { "name": "firmware_version" }, "date_from": "2003-07-03 12:00:00", "date_to": "2007-12-15 00:00:00", "value_date": null, "value_numeric": null, "value_varchar": "1L01" }, { "attribute": { "name": "elevation_cutoff_setting" }, "date_from": "2003-07-03 12:00:00", "date_to": "2007-12-15 00:00:00", "value_date": null, "value_numeric": 0, "value_varchar": null }, { "attribute": { "name": "temperature_stabilization" }, "date_from": "2003-07-03 12:00:00", "date_to": "2007-12-15 00:00:00", "value_date": null, "value_numeric": 2, "value_varchar": null } ], "item_type": { "name": "receiver" } } }, { "item": { "comment": "Moved from monument NPLB to NPLD, for better\r\nmechanical stability.\r\nA levelling mount is used with a 79.63mm tall\r\nspike above the monument point.\r\nAntenna cable is 30m of phase-stabilised\r\nAndrews FSJ1-50A, delay =\r\n(122.15+-0.1)ns (measured, 15-AUG-2000)", "contact_as_owner": { "agency": { "abbreviation": "NPL", "address": "Hampton Road\nTW11 0LW Teddington\nUnited Kingdom of Great Britain and Northern Ireland (the)", "infos": "", "name": "National Physical Laboratory", "www": "" }, "comment": "", "email": "peter.whibberley@npl.co.uk", "name": "Mr. Peter Whibberley", "phone": "+44 20 8943 6746", "role": "site_owner", "title": "" }, "contact_as_producer": { "agency": { "abbreviation": "NPL", "address": "Hampton Road\nTW11 0LW Teddington\nUnited Kingdom of Great Britain and Northern Ireland (the)", "infos": "", "name": "National Physical Laboratory", "www": "" }, "comment": "", "email": "peter.whibberley@npl.co.uk", "name": "Mr. Peter Whibberley", "phone": "+44 20 8943 6746", "role": "metadata_custodian", "title": "" }, "date_from": "2000-08-15 12:00:00", "date_to": "2007-12-15 00:00:00", "item_attributes": [ { "attribute": { "name": "antenna_type" }, "date_from": "2000-08-15 12:00:00", "date_to": "2007-12-15 00:00:00", "value_date": null, "value_numeric": null, "value_varchar": "AOAD\/M_T" }, { "attribute": { "name": "serial_number" }, "date_from": "2000-08-15 12:00:00", "date_to": "2007-12-15 00:00:00", "value_date": null, "value_numeric": null, "value_varchar": "340" }, { "attribute": { "name": "antenna_reference_point" }, "date_from": "2000-08-15 12:00:00", "date_to": "2007-12-15 00:00:00", "value_date": null, "value_numeric": null, "value_varchar": "BPA" }, { "attribute": { "name": "marker_arp_up_ecc" }, "date_from": "2000-08-15 12:00:00", "date_to": "2007-12-15 00:00:00", "value_date": null, "value_numeric": 0.0796, "value_varchar": null }, { "attribute": { "name": "marker_arp_north_ecc" }, "date_from": "2000-08-15 12:00:00", "date_to": "2007-12-15 00:00:00", "value_date": null, "value_numeric": 0, "value_varchar": null }, { "attribute": { "name": "marker_arp_east_ecc" }, "date_from": "2000-08-15 12:00:00", "date_to": "2007-12-15 00:00:00", "value_date": null, "value_numeric": 0, "value_varchar": null }, { "attribute": { "name": "alignment_from_true_n" }, "date_from": "2000-08-15 12:00:00", "date_to": "2007-12-15 00:00:00", "value_date": null, "value_numeric": 0, "value_varchar": null }, { "attribute": { "name": "antenna_cable_type" }, "date_from": "2000-08-15 12:00:00", "date_to": "2007-12-15 00:00:00", "value_date": null, "value_numeric": null, "value_varchar": "Andrews phase-stabilised FSJ1-50A" }, { "attribute": { "name": "antenna_cable_length" }, "date_from": "2000-08-15 12:00:00", "date_to": "2007-12-15 00:00:00", "value_date": null, "value_numeric": 30, "value_varchar": null } ], "item_type": { "name": "antenna" } } }, { "item": { "comment": "Moved from monument NPLB to NPLD, for better\r\nmechanical stability.\r\nA levelling mount is used with a 79.63mm tall\r\nspike above the monument point.\r\nAntenna cable is 30m of phase-stabilised\r\nAndrews FSJ1-50A, delay =\r\n(122.15+-0.1)ns (measured, 15-AUG-2000)", "contact_as_owner": { "agency": { "abbreviation": "NPL", "address": "Hampton Road\nTW11 0LW Teddington\nUnited Kingdom of Great Britain and Northern Ireland (the)", "infos": "", "name": "National Physical Laboratory", "www": "" }, "comment": "", "email": "peter.whibberley@npl.co.uk", "name": "Mr. Peter Whibberley", "phone": "+44 20 8943 6746", "role": "site_owner", "title": "" }, "contact_as_producer": { "agency": { "abbreviation": "NPL", "address": "Hampton Road\nTW11 0LW Teddington\nUnited Kingdom of Great Britain and Northern Ireland (the)", "infos": "", "name": "National Physical Laboratory", "www": "" }, "comment": "", "email": "peter.whibberley@npl.co.uk", "name": "Mr. Peter Whibberley", "phone": "+44 20 8943 6746", "role": "metadata_custodian", "title": "" }, "date_from": "2000-08-15 12:00:00", "date_to": "2007-12-15 00:00:00", "item_attributes": [ { "attribute": { "name": "radome_type" }, "date_from": "2000-08-15 12:00:00", "date_to": "2007-12-15 00:00:00", "value_date": null, "value_numeric": null, "value_varchar": "NONE" }, { "attribute": { "name": "serial_number" }, "date_from": "2000-08-15 12:00:00", "date_to": "2007-12-15 00:00:00", "value_date": null, "value_numeric": null, "value_varchar": "NONE" } ], "item_type": { "name": "radome" } } }, { "item": { "comment": "HM2, a Sigma Tau active H maser.\r\nIt is the source of UTC(NPL)", "contact_as_owner": { "agency": { "abbreviation": "NPL", "address": "Hampton Road\nTW11 0LW Teddington\nUnited Kingdom of Great Britain and Northern Ireland (the)", "infos": "", "name": "National Physical Laboratory", "www": "" }, "comment": "", "email": "peter.whibberley@npl.co.uk", "name": "Mr. Peter Whibberley", "phone": "+44 20 8943 6746", "role": "site_owner", "title": "" }, "contact_as_producer": { "agency": { "abbreviation": "NPL", "address": "Hampton Road\nTW11 0LW Teddington\nUnited Kingdom of Great Britain and Northern Ireland (the)", "infos": "", "name": "National Physical Laboratory", "www": "" }, "comment": "", "email": "peter.whibberley@npl.co.uk", "name": "Mr. Peter Whibberley", "phone": "+44 20 8943 6746", "role": "metadata_custodian", "title": "" }, "date_from": "1997-08-20 00:00:00", "date_to": "1998-07-13 00:00:00", "item_attributes": [ { "attribute": { "name": "standard_type" }, "date_from": "1997-08-20 00:00:00", "date_to": "1998-07-13 00:00:00", "value_date": null, "value_numeric": null, "value_varchar": "EXTERNAL H-MASER" }, { "attribute": { "name": "input_frequency" }, "date_from": "1997-08-20 00:00:00", "date_to": "1998-07-13 00:00:00", "value_date": null, "value_numeric": 5, "value_varchar": null } ], "item_type": { "name": "frequency_standard" } } }, { "item": { "comment": "HM1, a Sigma Tau active H maser.\r\nIt is the source of UTC(NPL).\r\nHM2 replaced by HM1 for UTC(NPL) following\r\nmalfunction on 11-JUL-1998.\r\n1PPS from port C2 of distr. amp. id 182,\r\nUTC(NPL)-NPLD_1PPS_in = +8433.7 ns\r\n(15-AUG-2000 to 15-JAN-2001).\r\nUTC(NPL)-NPLD_1PPS_in = +8426.4 ns\r\n(15-JAN-2001 onwards).\r\n5MHz from port 6 of distr. amp. id 184,\r\nthen quadrupler up to 20MHz.", "contact_as_owner": { "agency": { "abbreviation": "NPL", "address": "Hampton Road\nTW11 0LW Teddington\nUnited Kingdom of Great Britain and Northern Ireland (the)", "infos": "", "name": "National Physical Laboratory", "www": "" }, "comment": "", "email": "peter.whibberley@npl.co.uk", "name": "Mr. Peter Whibberley", "phone": "+44 20 8943 6746", "role": "site_owner", "title": "" }, "contact_as_producer": { "agency": { "abbreviation": "NPL", "address": "Hampton Road\nTW11 0LW Teddington\nUnited Kingdom of Great Britain and Northern Ireland (the)", "infos": "", "name": "National Physical Laboratory", "www": "" }, "comment": "", "email": "peter.whibberley@npl.co.uk", "name": "Mr. Peter Whibberley", "phone": "+44 20 8943 6746", "role": "metadata_custodian", "title": "" }, "date_from": "1998-07-13 00:00:00", "date_to": "2006-10-26 00:00:00", "item_attributes": [ { "attribute": { "name": "standard_type" }, "date_from": "1998-07-13 00:00:00", "date_to": "2006-10-26 00:00:00", "value_date": null, "value_numeric": null, "value_varchar": "EXTERNAL H-MASER" }, { "attribute": { "name": "input_frequency" }, "date_from": "1998-07-13 00:00:00", "date_to": "2006-10-26 00:00:00", "value_date": null, "value_numeric": 5, "value_varchar": null } ], "item_type": { "name": "frequency_standard" } } }, { "item": { "comment": "HM2, a Datum active H maser.\r\nIt is the source of UTC(NPL).\r\nUTC(NPL)-NPLD_1PPS_in = +8382.3 ns\r\n10MHz multiplied up to 20MHz for receiver", "contact_as_owner": { "agency": { "abbreviation": "NPL", "address": "Hampton Road\nTW11 0LW Teddington\nUnited Kingdom of Great Britain and Northern Ireland (the)", "infos": "", "name": "National Physical Laboratory", "www": "" }, "comment": "", "email": "peter.whibberley@npl.co.uk", "name": "Mr. Peter Whibberley", "phone": "+44 20 8943 6746", "role": "site_owner", "title": "" }, "contact_as_producer": { "agency": { "abbreviation": "NPL", "address": "Hampton Road\nTW11 0LW Teddington\nUnited Kingdom of Great Britain and Northern Ireland (the)", "infos": "", "name": "National Physical Laboratory", "www": "" }, "comment": "", "email": "peter.whibberley@npl.co.uk", "name": "Mr. Peter Whibberley", "phone": "+44 20 8943 6746", "role": "metadata_custodian", "title": "" }, "date_from": "2006-10-26 00:00:00", "date_to": null, "item_attributes": [ { "attribute": { "name": "standard_type" }, "date_from": "2006-10-26 00:00:00", "date_to": null, "value_date": null, "value_numeric": null, "value_varchar": "EXTERNAL H-MASER" }, { "attribute": { "name": "input_frequency" }, "date_from": "2006-10-26 00:00:00", "date_to": null, "value_date": null, "value_numeric": 10, "value_varchar": null } ], "item_type": { "name": "frequency_standard" } } } ], "station_networks": [ { "name": "EPN" }, { "name": "EPOS" }, { "name": "IGS" } ], "station_type": "GNSS Continuous" }