| dbo:abstract |
Time and frequency transfer is a scheme where multiple sites share a precise reference time or frequency. The technique is commonly used for creating and distributing standard time scales such as International Atomic Time (TAI).Time transfer solves problems such as astronomical observatories correlating observed flashes or other phenomena with each other, as well as cell phone towers coordinating handoffs as a phone moves from one cell to another. Multiple techniques have been developed, often transferring reference clock synchronization from one point to another, often over long distances. Accuracy approaching one nanosecond worldwide is economically practical for many applications. Radio-based navigation systems are frequently used as time transfer systems. In some cases, multiple measurements are made over a period of time, and exact time synchronization is determined retrospectively. In particular, time synchronization has been accomplished by using pairs of radio telescopes to listen to a pulsar, with the time transfer accomplished by comparing time offsets of the received pulsar signal. (en) 時間和頻率轉換敘述如何將時間和頻率從一個地點轉移到另一個地點，並進行比較和量度。這種技術經常用於創建和散佈標準時間的標度，像是國際原子時。 時間和頻率轉換技術的例子包括： * 同時觀測的方法： * 同時載體觀察GPS的信號 * 經由電視傳送的同時觀測轉換時間 * 經由電波天文學訊號的同時觀測轉換時間 * 雙向傳輸方法： * (zh) |
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dbr:Carrier_signal dbr:Precision_Time_Protocol dbr:Propagation_delay dbr:Satellite_navigation dbr:Nanosecond dbc:Synchronization dbr:Time_from_NPL_(MSF) dbr:Time_synchronization_in_North_America dbr:Radio_telescope dbr:GPS dbr:Global_Positioning_System dbr:NIST dbr:Phase_(waves) dbr:Pulsar dbr:Synchronization dbc:Telecommunications_techniques dbr:DCF77 dbr:Cellular_network dbr:International_Atomic_Time dbr:International_Earth_Rotation_and_Reference_Systems_Service dbr:Radio_astronomy dbr:Atomic_clock dbr:LORAN dbr:Television dbr:Network_Time_Protocol dbr:Radio_clock dbr:Cellular_tower dbr:Time_signal dbr:Time_ball dbr:Round-trip_delay dbr:Two-way_satellite_time_and_frequency_transfer dbr:Radio_navigation dbr:GNSS dbr:GNSS_receiver dbr:Time_and_frequency_metrology dbr:Time_synchronization |
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dbt:Reflist dbt:Rp dbt:Short_description dbt:Time_Topics dbt:Time_measurement_and_standards dbt:TimeSig |
| dct:subject |
dbc:Synchronization dbc:Telecommunications_techniques |
| rdfs:comment |
時間和頻率轉換敘述如何將時間和頻率從一個地點轉移到另一個地點，並進行比較和量度。這種技術經常用於創建和散佈標準時間的標度，像是國際原子時。 時間和頻率轉換技術的例子包括： * 同時觀測的方法： * 同時載體觀察GPS的信號 * 經由電視傳送的同時觀測轉換時間 * 經由電波天文學訊號的同時觀測轉換時間 * 雙向傳輸方法： * (zh) Time and frequency transfer is a scheme where multiple sites share a precise reference time or frequency. The technique is commonly used for creating and distributing standard time scales such as International Atomic Time (TAI).Time transfer solves problems such as astronomical observatories correlating observed flashes or other phenomena with each other, as well as cell phone towers coordinating handoffs as a phone moves from one cell to another. (en) |
| rdfs:label |
Time and frequency transfer (en) 時間和頻率轉換 (zh) |
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freebase:Time and frequency transfer wikidata:Time and frequency transfer dbpedia-zh:Time and frequency transfer https://global.dbpedia.org/id/4waqv |
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wikipedia-en:Time_and_frequency_transfer?oldid=1120917536&ns=0 |
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wikipedia-en:Time_and_frequency_transfer |
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dbr:Time_synchronization_in_North_America dbr:Clock_synchronization dbr:Synchronization dbr:International_Atomic_Time dbr:Reference_Broadcast_Synchronization dbr:Time_&_frequency_transfer dbr:Time_signal dbr:Synchronous_Ethernet dbr:Time_transfer dbr:Two-way_satellite_time_and_frequency_transfer dbr:Frequency_transfer dbr:Time_dissemination |
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wikipedia-en:Time_and_frequency_transfer |