Abstract
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.
Highlights
An expendable current profiler (XCP) is a type of marineenvironment measuring device that can rapidly obtain information about current profiles (Liu and He, 2010)
After varnished wire had been selected as the data transmission medium, the transmission system physical layer was determined
After finishing the marine test of the data transmission over the varnished wire, the varnished wire was applied to our developed XCP when we implemented our marine test in October 2009
Summary
An expendable current profiler (XCP) is a type of marineenvironment measuring device that can rapidly obtain information about current profiles (Liu and He, 2010). The measured data are transmitted back to the carrying platform through wireless communication (Abdullah and Bong, 2014; Wang and Gulliver, 2015) and are processed to determine, in real time, the variation in the dynamic marineenvironment parameters with the water depth. Thanks to these capabilities, XCP is used as an advanced and efficient measuring method for application to scientific marine investigations, environmental investigations for fisheries, and marine environmental observations for the military (Zhang et al, 2013; Liu and Chen, 2011; Liu et al, 2010). As part of our development of XCP, digital signal transmission was employed as a means of solving the data transmission problem associated with varnished wires The issues affecting digital signal dynamic transmission between an XCP probe and buoy are discussed in detail
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