Realization of FM Pulse Counting Discrimination System Based on FPGA in XCP
JIA Zhi-cheng1,GUO Li-juan1,LI Yong-jun2,CHEN Lei3 (1. School of Information Engineering, Hebei University of Technology,Tianjin 300401,China;2. National Ocean Technology Center,Tianjin 300112,China;3. School of Information Engineering,Tianjin University of Commerce,Tianjin 300134,China) Abstract:Three XCP FM signals are taken pulse counting discrimination to improve the anti-interference performance in frequency discrimination, while frequency multiplier technology are used to enhance the sensitivity of the frequency. The reference signal generator produce two-phase reference signal CQR and CIR which corresponding to orthogonal and in-phase, then these two simultaneous orthogonal signals are used to control the frequency discrimination implementation of multi-channel pulse counter collaterally. The hardware designation of frequency discrimination based on FPGA may reduce system complexity and improve system stability performance. The actual tests results show that the system completely meets the accuracy and reliability requirements and so on. Key words:expendable current profiler(XCP);frequency discrimination;pulse counting;modulation signal;field programmable gate arrays(FPGA) |