Synchronization sampling method based on delta-sigma analog-digital converter for underwater towed array system

Synchronization sampling is very important in underwater towed array system where every acquisition node (AN) samples analog signals by its own analog-digital converter (ADC). In this paper, a simple and effective synchronization sampling method is proposed to ensure synchronized operation among dif...

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Bibliographic Details
Published in:Review of scientific instruments 2014-03, Vol.85 (3), p.034701-034701
Main Authors: Jiang, Jia-Jia, Duan, Fa-Jie, Li, Yan-Chao, Hua, Xiang-Ning
Format: Article
Language:English
Subjects:
Arrays
Clocks
Converters
Messages
Model accuracy
Phase locked loops
Sampling
Sampling error
Scientific apparatus & instruments
Synchronism
Underwater
Vibration
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Summary:Synchronization sampling is very important in underwater towed array system where every acquisition node (AN) samples analog signals by its own analog-digital converter (ADC). In this paper, a simple and effective synchronization sampling method is proposed to ensure synchronized operation among different ANs of the underwater towed array system. We first present a master-slave synchronization sampling model, and then design a high accuracy phase-locked loop to synchronize all delta-sigma ADCs to a reference clock. However, when the master-slave synchronization sampling model is used, both the time-delay (TD) of messages traveling along the wired transmission medium and the jitter of the clocks will bring out synchronization sampling error (SSE). Therefore, a simple method is proposed to estimate and compensate the TD of the messages transmission, and then another effective method is presented to overcome the SSE caused by the jitter of the clocks. An experimental system with three ANs is set up, and the related experimental results verify the validity of the synchronization sampling method proposed in this paper.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4868440