ISSN施工方式时间检核和校准

ISSN技术是可控震源ISS方式激发加无线节点接收的采集模式。由于使用的主要设备DSD、SDR和GSR都需要GPS授时并分别给所记录的数据打上时间标识,数据处理时主要依据这些时间标识对连续记录的数据进行分离、相关等运算,所以时间精度对地震采集的数据质量至关重要。本文介绍了ISSN技术和使用的设备,及对采集的时间精度进行检核和校准的几种方法,并对这些方法在开工审计和施工过程中的灵活使用进行了探讨。

Time precision verification in ISSN operation

ISSN is a kind of technology which combines independent simultaneous sweeping and receiving with node. The main equipment applied in this acquisition method includes DSD, SDR and GSR node. They are all need GPS timing during operation and the data recorded are stamped with GPS time as well. The stamped GPS time will be the key element for the continuous data separation and correlation at processing stage. The timing accuracy affects data quality directly. This paper introduced the related equipment and the method on how the time accuracy is checked and calibrated during ISSN operation. Several different methods for flexible time checking during the acceptance test and operation stages are also discussed.