Design And Actualization Of FH-MFSK Modem Based On OMAP

The application background of this thesis is underwater acoustic communication network,and the OMAP-L138processor is the core chip. In this thesis, the main task is implementing anddesigning nodes of underwater acoustic communication network, the FH-MFSK signal is themain signal transfer form of the node, and the pool test has already verified the effectiveness ofthe system.First, in the environmental background of the underwater acoustic communication, thisthesis analyzes the influence of underwater acoustic channel, which helps to achieve reliableunderwater acoustic communication. This thesis introduces the underwater acoustic spreadspectrum communication system including classification, technical characteristics andapplication. Particularly, this thesis analyzes the principles and technical characteristics of FHSSunderwater acoustic communication system, as well as the influence of frequency hoppingsequence.Next, this thesis is designed based on the complement of OMAP-L138of underwateracoustic communication network node digital system; this thesis introduces the core processingsystem and peripheral processing system, including their compositions and workingprinciples;this thesis accomplish selection, circuit design and interface design corresponding tofunction module chip, and so on.This thesis introduces the principle and classification of the embedded operating system,especially embedded Linux operating system, this thesis analyzes the composition and workingprinciple of its start aid UBL and UBoot, and gives method of transplantation and download.Finally, we make the FH-MFSK module in the digital system, and accomplish informationtransfer in the pool test. The conclusion is as follows, based on the OMAP digital system, we canperfectly achieve our task that is underwater information transfer, and the transfer information isaccurate.