Abstract: In the direct sequence spread spectrum communication system,in order to unravel the original data accurately and completely,the accuracy and timeliness of the pseudo code synchronization is very important.Therefore,for the synchronization problem of pseudo-code in direct sequence spread spectrum communication,this paper combines the theory of conventional delay-locked tracking loop and sliding correlation method to design the circuit with Xilinx FPGA as the core control unit,and the acquisition and tracking of pseudo code is realized based on delayed phase-locked loop.The test results show that the system method can realize the pseudo-code capture stably and effectively,and can track the pseudo-code in time and accurately.

Key words: PN code, delay phase-locked loop, capture, tracking, FPGA