| 词条 | RBU (radio station) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 释义 |
RBU is controlled by All-Russian Scientific Research Institute for Physical-Engineering and Radiotechnical Metrology. It is operated by Russian Television and Radio Broadcasting Network.[5] Time codeEvery 100 ms, synchronized to the UTC second, one bit is transmitted:
100 Hz modulation encodes a binary 0, while 312.5 Hz modulation encodes a binary 1. Each UTC second consists of 10 such bits. 6 of them are fixed, two encode minute boundaries, and two provide time code information:
Each minute, the two bits of time code encode the local time of the following minute (like DCF77) and some additional information. Because the time code starts with two 1 bits, the top of the minute is uniquely marked by 5 consecutive 1 bits.[8]
dUT1 is an additional, higher-precision correction to DUT1. UT1 = UTC + DUT1 + dUT1. Bits with a weight of ± are 0 for positive, 1 for negative. The time transmitted is Moscow local time; UTC can be computed by subtracting the value of the ΔUT field. See also
References1. ^1 {{Citation |url=http://www.cl.cam.ac.uk/~mgk25/time/lf-clocks/ |title= Low-frequency radio time signals |author=Markus Kuhn |authorlink=Markus Kuhn (computer scientist) |date=2006-05-10 |access-date=2011-09-20}} {{Time signal stations}}{{Time signal authorities}}2. ^1 {{Citation |url=http://www.itu.int/dms_pub/itu-r/oth/0A/08/R0A080000070001MSWE.doc |author=International Telecommunication Union |date=6 October 2010 |title=Characteristics of standard-frequency and time-signal emissions in allocated bands and characteristics of stations emitting with regular schedules with stabilized frequencies, outside of allocated bands |access-date=2014-10-30}} Supplement to Recommendation ITU-R TF.768 "Standard frequencies and time signals". 3. ^{{Citation |url=http://www.dxinfocentre.com/time-vlf.htm |author=William Hepburn |title=VLF time signal brioadcasts |date=2006-10-29 |access-date=2011-09-20}} 4. ^{{cite web|url=http://vcfm.ru/vc/Cities/moskva.htm |title=Москва |publisher=Vcfm.ru |date= |access-date=2012-10-24}} 5. ^{{cite web|url=http://www.vniiftri.ru/index.php/ru/struct/gsvch|title=Главный Метрологический Центр Государственной Службы Времени и Частоты (ГМЦ ГСВЧ (НИО-7))|publisher=VNIIFTRI|access-date=23 July 2018}} 6. ^1 2 {{Citation |url=http://relax-sdr.3dn.ru/load/0-0-0-66-20 |format=PDF |title=Standard Frequency and Time Signal Stations on Longwave and Shortwave |author=Klaus Betke |date=1 August 2002 |access-date=2011-09-20 |pages=16–17}}. Note that there is a modulation type error in this reference. 7. ^1 2 {{Citation|url=ftp://ftp.vniiftri.ru/BULLETINS/V/bull_b16_2018.pdf|format=PDF|title=Standard Time and Frequency Signals|pages=5-6, 18–20|access-date=2018-07-15}} -- official signal specification, in russian. 8. ^See Nils Schiffhauer's radio monitoring pages. Under "Audio Clips — Medium Wave (& Longwave)" are audio samples of several time signal stations, including both an audio clip and a spectrogram "waterfall diagram" of RBU at the top of the hour. It clearly shows the 0.1 second bits producing sidebands straddling the carrier at ±100 Hz and ±312.5 Hz, and the 5 consecutive 1 bits marking the top of the minute. The carrier has been shifted down by 66.0 kHz, so it shows up on the plot at 666⅔ Hz. 9. ^1 {{Citation |title=PUB 117: Radio Navigation Aids |author=National Geospatial-Intelligence Agency |authorlink=National Geospatial-Intelligence Agency |url=http://msi.nga.mil/NGAPortal/MSI.portal?_nfpb=true&_pageLabel=msi_portal_page_62&pubCode=0009 |year=2005 |pages=2–5 |access-date=2011-09-20}} 3 : Time signal radio stations|Time in Russia|Call signs |
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