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Low Time Drift Technology for Marine CSEM Recorder

CHEN Kai1,2,DENG Ming1,2,WU Zhong-liang3,JING Jian-en1,2,LUO Xian-Hu3,WANG Meng1,2(1.Key Laboratory of Geo-detection(China University of Geosciences,Beijing),Ministry of Education,Beijing 100083,China; 2.School of Geophysics and Information Technology,China University of Geosciences,Beijing 100083,China; 3.Guangzhou Marine Geological Survey Bureau,Guangzhou,Guangdong 510760,China)  
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.
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