Design And Implementation Of DSP Subsystem In Data Link Integration Terminal

With the modern warfare striding forward towards informatization,the importance of tactical data links in military communications is increasing.At the same time,various countries develope a variety of data link systems in order to meet the changing operational requirements.However,different data link systems can not exchange data with each other,leading to the coexistence of multiple data links.To cope with this problem,data link system integration technology comes into being.In the domestic,with the deepening of tactical data link research,multi-data link integration technology becomes a hot topic.Aiming at this subject,the author's laboratory proposes a set of schemes of designing multi-tactical data link systems integration machine to achieve a high-performance digital communications transceivers.The author involves in the project,and is responsible for the design and implementation of the Link11 data link system based on DSP.Firstly,this paper studies the development of tactical data link at home and abroad,and illustrates the significance of the research.Then,this paper introduces the DSP chips used in the project and explaines the key technologies involved in the project implementation,as well as the difficulties encounterd in the implementation process.Subsequently,this paper describes the design and realization of data link interface,including NDK interface for host and DSP communication,and McBSP interface for DSP and FPGA data exchange.The project realizes the inter-connection communication between host,DSP and FPGA,and provides the communication interface for the function design of the link layer.Finally,according to the design of digital baseband transceiver system,this paper completes the project based on TMS320C6657 DSP chip.The design of DSP uses modular solution to implement the system's underlying link control module,data transmission module and data receiving module.The data transmission module mainly includes synchronization sequence generation,data sequence generation and D8PSK modulation.The data receiving module mainly includes synchronization,demodulation and Viterbi decoding.For each function module test verification,then on this basis also for the whole digital baseband transceiver system connectivity and the stability of the test verification.