Research On The Realizaion Technology Of Data Link Physical Layer

Data link is the core of the current military information technology. With the development of the new technology, it becomes more and more important in future wars.In this thesis, some research is made in the realization technology of data link physical layer. Firstly, 8PSK, a key modulation technology in link22, is researched and simulated. We analyzed the impact of different filter parameters to the system performance and put forward a waveform storage table searching method to replace the convolution operation in application. At the same time, the storage capacity is reduced to 1/4 by using the symmetry of the table.Secondly, the physical layer of a data link system JTIDS is briefly introduced. A simulation model of a general data link based on JTIDS is set up and the main technology like soft spread spectrum and pulse communication are researched. The basic processing algorithms are simulated in MATLAB and C program. In order to process in real time for the hardware, a new method which uses waveform storage to replace spread spectrum and modulation is put forward. The algorithm is simulated and testified in VHDL language.