Data Transmission On VHF FH Radio Set

This subject comes from a military development project - Digital VHF FH Radio Set, and it is mainly used for the data communication between navy vessels. A practical plan in File Transfer Layer, Data Link Layer and Physical Layer is designed in this paper. Then the theoretic analysis and computer simulation of it are given. At last, this plan is realized by programming.This paper realizes the GFSK modulation-and-demodulation function of the FH radio set that has a digital IF module, and supports more than one transfer rate and can recognize the rate automatically. Based on the performance and features of half-duplex FH radio sets, the data link layer protocol includes Control frame, Information frame and Acknowledgement frame, carries out the ARQ plan which combines the Select Repeat ARQ and Stop-and-Wait ARQ together. It supports more than one data transfer rate and can self-adapts to the rate change. The data transfer protocol supports single file transfer and has the function of Break Reconnecting.