海底可控源电磁采集站的低时漂技术研究  

Low Time Drift Technology for Marine CSEM Recorder

作　　者：陈凯[1,2] 邓明[1,2] 伍忠良[3] 景建恩[1,2] 罗贤虎[3] 王猛[1,2] 

机构地区：[1]地下信息探测技术与仪器教育部重点实验室(中国地质大学,北京),北京100083 [2]中国地质大学地球物理与信息技术学院,北京100083 [3]国土资源部广州海洋地质调查局,广东广州510760

出　　处：《现代地质》2012年第6期1312-1316,共5页Geoscience

基　　金：中央高校基本科研业务费专项资金资助项目;国家高技术研究发展计划项目(2006AA09A201)

摘　　要：海洋可控源电磁方法要求位于海底的多台可控源电磁采集站对微弱的电磁信号进行长期同步连续观测,对各台采集站的时间一致性严格要求。为解决海底无法进行GPS授时这一技术难题,提出了以高稳OCXO(恒温晶体振荡器)与精确授时GPS结合为硬件基础,形成通过下水前对钟、出水后对钟以及时漂补偿等组成的低时漂技术。通过室内及海洋试验,实现了多台海底可控源电磁采集站同步观测,显著降低数据同步误差。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.

关 键 词：海洋可控源电磁法 低时漂 OCXO 

分 类 号：P631.2[天文地球—地质矿产勘探]