| Voyage Data Recorder (VDR) is an equipment which can record ship navigation status and manipulation information and take an important role on navigation safety at sea and accident analysis. The massive data of VDR needs to be saved rapidly and reliably , because it is the key basis for analyzing the accident. Therefore, the Protective Data Container (PDC) becomes an important constituent of VDR. Simultaneously, as the present mainstream of embedded operating system, VxWorks has the superior technical performance, the rich application software support, the good technical service and the reliable system stability. Linking the saved demand of our VDR project, this article conducts the research and the realization to the main software technologies of the PDC under the PC 104/VxWorks platform.This article firstly introduces the background and the significance of topic research, then taking VDR as the background puts forward that the main research of this article, including rapid and reliable data transmission method of the PDC, the local data files management and the realization of good man-machine interface. Followly introduces software platform VxWorks and integrated development environment Tornado.This article expatiats on the realization of ethernet data transmission method, establishing the clienrt / server system construction model through the socket programming, as the server, PDC receives data according to user-defined data tranfering protocol and saves it in local file system, then puts forward the scheme to manage these files, and carrys the realization on under VxWorks. This article also analyzes the application of network reliability and the network exception process in PDC detailedly. Then achieves an embedded Web Server in PDC, with in-depth studies of dynamic technologies of the migrated GoAhead Webserver, applys them in PDC, finally provides a convenient tool to manage and configure PDC through the man-machine interface in the form of web, the scheme... |
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