A High-Precision Energy-Efficient GPS Time-Sync Method for High-Density Seismic Surveys

Ruyun Tian; Junjie Zhang; Shuai Zhang; Longxu Wang; Hongyuan Yang; Yuda Chen; Yuanjie Jiang; Jun Lin; Linhang Zhang

doi:10.3390/app10113768

Applied Sciences (May 2020)

A High-Precision Energy-Efficient GPS Time-Sync Method for High-Density Seismic Surveys

Ruyun Tian,
Junjie Zhang,
Shuai Zhang,
Longxu Wang,
Hongyuan Yang,
Yuda Chen,
Yuanjie Jiang,
Jun Lin,
Linhang Zhang

Affiliations

Ruyun Tian: College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China
Junjie Zhang: College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China
Shuai Zhang: College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China
Longxu Wang: College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China
Hongyuan Yang: College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China
Yuda Chen: College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China
Yuanjie Jiang: College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China
Jun Lin: College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China
Linhang Zhang: College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China

DOI: https://doi.org/10.3390/app10113768
Journal volume & issue: Vol. 10, no. 11
p. 3768

Abstract

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Large numbers of seismic channels and high-density energy-efficient acquisition systems are the development trend of seismic instruments and have attracted high R&D interests in recent years. The combination of remote sensing and wireless sensor network technology provides superior observation capabilities for high-density seismic exploration. However, large-scale and multi-node acquisition methods place higher requirements on time synchronization performance. Seismic data with poor time synchronization will cause considerable errors in the interpretation of seismic data and even have no practical significance. Thus, the strict time synchronization performance is the prerequisite and basis for the application of cable-less storage seismograph in high-density seismic array applications. The existing time synchronization methods have high power consumption and poor time synchronization accuracy, which is not suitable for the long-time task. In addition, these methods are affected by the number of nodes and the distance. This paper presents an energy-efficient time-sharing indexed interpolation intercept method for the seismic data synchronization. The time synchronization method uses the high-precision TCXO as the main clock and records GPS time in the SD card at intervals to achieve the high-precision time-stamp for the seismic data. Then the seismic data is intercepted intermittently based on precise time stamps, which achieves the strict seismic data synchronization. Performance analysis shows that the time synchronization accuracy of the proposed method is 0.6 μs and saves 73% energy of the time-sync periods compared to the common GPS timing method. The field measurement results indicate that the time synchronization accuracy is not associated with the working time and the distance between nodes so that the proposed synchronization method is suitable for the high-density seismic survey.

Published in Applied Sciences

ISSN: 2076-3417 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Engineering (General). Civil engineering (General); Science: Biology (General); Science: Physics; Science: Chemistry
Website: http://www.mdpi.com/journal/applsci

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