深井地震综合观测系统授时方法设计与实现

doi:10.12196/j.issn.1000-3274.2024.01.003

Abstract

Abstract: It is very important to realize accurate and reliable transmission of Pulse Per Second (PPS) in borehole seismic comprehensive observation. Aiming at this requirement, a Orthogonal Frequency Division Multiplexing (OFDM) symbol is designed, and some frequency points are selected to mark the second pulse (PPS) for transmission, avoiding the transmission of second pulse (PPS) with a separate wire. It saves hardware resources and improves transmission reliability. In addition, due to the frequency band limitation of the transmission channel and the influence of the filter in the receiving process, the delay of the direct transmission second pulse (PPS) is difficult to judge, and the phase-frequency characteristics of the channel and filter are determined and measurable. When the transmission second pulse (PPS) is marked by sine wave, the delay deviation caused by the filter can be calculated based on the phase-frequency characteristics of the filter. Therefore, it is possible to correct the influence of the channel and filter. The calculation error of the time shift based on the sine wave marked transmission second pulse (PPS) can reach the microsecond level, which can fully meet the requirements of the current seismic observation.

Key words: Borehole observation, Deliver the time, Pulse per second

CLC Number:

P315.7

WU Xu, XUE Bing, LI Jiang, ZHU Xiao-yi, ZHANG Bing, HUANG Shi. Design and Implementation of Borehole Comprehensive Observation Timing System[J]. EARTHQUAKE, 2024, 44(1): 37-49.

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Design and Implementation of Borehole Comprehensive Observation Timing System

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