Continuous-wave Pseudo-code Phase Modulation Ranging Key Technologies

The pseudo-random code has good autocorrelation function, which is used in thepseudo-random code fuze. The fuze, which has excellent cut-off performance and stronganti-jamming capability, is one of the important directions of the fuse development. Aexperimental system of pseudo-random code system is designed in this paper, which isused for ranging, the realization of pseudo-random code synchronization in the receiver ismainly researched, in the end, a solution is presented.With the fast development of microelectronics and Electronics Design Automation(EDA) techniques, the programmable logic devices such as FPGA and CPLD have beenwidely used in the field of digital signal processing for its high speed, flexible exploitationand fast verifying. The realization of pseudo-random synchronizing method is based onFPGA, a kind of the programmable logic device.Firstly, the paper reviews the history of correlation field, presents the principle of thePN ranging system, pseudo-random sequence, the modulation and demodulation, thenresearches the principle of capture and trace, compares the common way of capture andtrace then confirm the way used in this paper in the end, presents the realization. It isemulated in the Modelsim.The study in this paper solves the key technical problem, the pseudo-randomsynchronization of the whole ranging system. Further more it lies the foundation ofimplementing.