A NEW measurement and calibration method of the synchronization sampling error of sensor array

All seismic signal acquisition nodes must be synchronized so that they have the same sampling time for seismic signal acquisition in a distributed chained system with a large number of acquisition nodes. However, the propagation delay generated by the long-distance transmission link causes a synchronization acquisition error. In order to correct accurately the synchronization acquisition error, getting the accurate propagation delay size is a necessary condition. With regards to these, based on the detailed analysis of the propagation delay, a model and method for accurately measuring the propagation delay are proposed. Based on the model and method, the propagation delay can be measured accurately and then the delay calibration size can be transmitted to the corresponding acquisition node only through one transmission line. Then, an easy calibration method is proposed, and through it, the synchronization error can be completely eliminated. Simulation results show the effectiveness of the model and method proposed in the paper.