Articles | Volume 6, issue 2
https://doi.org/10.5194/gi-6-263-2017
https://doi.org/10.5194/gi-6-263-2017
Research article
 | 
14 Jul 2017
Research article |  | 14 Jul 2017

Dynamic data transmission technology for expendable current profiler based on low-voltage differential signaling

Shuhan Li, Qisheng Zhang, Xiao Zhao, Shenghui Liu, Zhenzhong Yuan, and Xinyue Zhang

Abstract. A dynamic data transmission technology for expendable current profilers (XCPs) is proposed in this paper. Two parallel varnished wires are employed as the data transmission medium. By testing the transmission properties of the varnished wires, a baseband transmission system is studied and designed. Modified low-voltage differential signaling (LVDS) is adopted as the physical layer for data transmission. The data transmission protocol is modified and optimized in accordance with the RS-232 protocol, and the Manchester code is superimposed. According to the results of indoor and marine tests, the data transmission distance of the designed system, which employs a 0.1 mm diameter varnished wire, extends to 2 km with high efficiency and accuracy for data transmission, exhibiting excellent performance. Moreover, this data transmission technology could be used for other expendable marine-environment parametric measuring instruments such as an expendable bathythermograph and an expendable conductivity temperature depth profiler.

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Short summary
The main contribution of our paper is the proposal of a dynamic data transmission technology of an expendable current profiler, using varnished wires as the data transmission medium. The results of both indoor and marine tests demonstrate high efficiency and accuracy for transmission distances up to 2 km. We believe that this study will be of interest to the readership because our research is of particular interest and use for scientific marine investigation.