BPC (time signal)
BPC is the callsign of a time signal broadcasting from the BPC Shangqiu Low-Frequency Time-Code Radio Station, cooperatively constructed by the National Time Service Center of the Chinese Academy of Sciences and Xi’an Gaohua Technology Co., Ltd.[1], since April 25, 2002.
BPC transmits a time signal on 68.5 kHz, which can be used for synchronizing radio controlled clocks. As opposed to other time signal transmitters, the signal format is not published openly; a special license is required. The transmission site is situated near Shangqiu, Henan Province[1] at 34°27′25″N 115°50′13″E / 34.457°N 115.837°E.[2]
BPC broadcasts at 90 kW for 20 hours per day, with a 4-hour break from 05:00–09:00 (China Standard Time) daily (21:00–1:00 UTC).[3] BPC includes both conventional amplitude modulated time code and additional spread-spectrum time code, about which little is known.[4]
References
- ^ "Low-frequency radio time signals". Cl.cam.ac.uk. Retrieved 2011-10-20.
- ^ "::时间服务::". Archived from the original on 2012-06-17. Retrieved 2013-03-16.
- ^ 西安高华科技有限公司 (2020-01-10). "河南商丘BPC电波塔发播时间公布" (in Chinese).
- ^ Feng, Ping; Wu, Guichen; Bai, Yan; Ding, Xiaofeng (August 2010), Tan, Jiubin; Wen, Xianfang (eds.), "Additional spread spectrum modulation timing method in BPC", Sixth International Symposium on Precision Engineering Measurements and Instrumentation. Proceedings of the SPIE, Proceedings of SPIE, 7544: 75441X–75441X–6, Bibcode:2010SPIE.7544E..1XF, doi:10.1117/12.885845, S2CID 110865336
External links
- 低频时码授时, from the National Time Service Center, Chinese Academy of Sciences
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