Research On Key Technology Of PDC Based On ARM9

VDR is an intelligently equipment which is used to record and conserve the important information and parameter of vessel during its voyaging. Its function is similar to the "black box" on the airplane. When vessels meet accident, the data play the important role in analyzing the origin of the accident.VDR has many functions including information gathering, information transferring, information recording, information encrypting, information backup, accident analyzing and so on and can record the recent course, speed, information of sonar, temperature, humidity, pressure of the vessel and the order of the commander. Once vessels meet wreck, As long as succors read data from the PDC, they can know the reason of wreck.It describes how to deal with the key technology in detail under the ARM/Linux platform in this paper.At first, the paper introduces the function and structure of VDR and the definition and character of PDC; hardware realization of system that is explained; then analyze technology of embedded operating system; network communication technology to the system used has been realized particularly discussing. It introduces the foundation content of data encryption technology, and emphasizes on the realizing of data encryption on the base of software technology, according to the character of embedded system and the idea of pattern-oriented software architecture it describes design process of host software in detail finally.