Low Time Drift Technology for Marine CSEM Recorder

Geoscience ›› 2012, Vol. 26 ›› Issue (6): 1312-1316.

• Appilance and Signal Processing • Previous Articles Next Articles

Low Time Drift Technology for Marine CSEM Recorder

CHEN Kai ^-1,2, DENG Ming^-1,2, WU Zhong liang ^-3, JING Jian en^-1,2，LUO Xian Hu^-³, WANG Meng^-1,2

1 Key Laboratory of Geodetection (China University of Geosciences, Beijing), Ministry of Education, Beijing100083, China;
2 School of Geophysics and Information Technology, China University of Geosciences, Beijing100083, China;
3 Guangzhou Marine Geological Survey Bureau, Guangzhou,Guangdong510760, China

Received:2012-06-15 Revised:2012-08-20 Online:2012-10-24 Published:2012-10-31

Abstract

Abstract:

According to the marine CSEM(controlled source electromagnetic method), many controlled source electromagnetic acquisition stations in the bottom of the sea need to observe weak electromagnetic signal synchronously and continuously for long term. To solve the problem that it can‘t receive GPS RF signal in submarine, the high stability OCXO combines with precision GPS clock as the hardware foundation. The low time drift technology is put forward through locking GPS before and after launched deployment, as well as time drift compensation. Many controlled source electromagnetic acquisition stations are realized synchronous observation. Indoor and sea trials indicated that the technology could reduce data synchronization error significantly.

Key words: marine CSEM, low time drift, OCXO

CHEN Kai, DENG Meng, WU Zhong-Liang, JING Jian-En, LUO Xian-Hu, WANG Meng. Low Time Drift Technology for Marine CSEM Recorder[J]. Geoscience, 2012, 26(6): 1312-1316.

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Low Time Drift Technology for Marine CSEM Recorder

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