3Detlef Helling, Marc Hense, Herman van der Auweraer, et al. Data ttream synchronization of distributed measurements systems using GPS technology[J]. IEEE Workshop on Intelligent Data Acqwisition and Advanced Computing Systems; Technology and Applicutions, 2005: 267-270.
4Lin J, Ma L, Yu S B. Implementation of remote synchronization in electromagnetic surveys by GPS timing signals[R]. Third International Conference on Electric Measurement and Instrumentation, Beijing, 1997.