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�������պ����ѧѧ�� 2007, Vol. 33 Issue (06) :672-676    DOI:
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Fast PN code acquisition for DSSS receiver in high dynamic situation
Xu Feng, Shao Dingrong, Li Shujian*
School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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Abstract�� For direct sequence spectrum system(DSSS) receiver in high dynamic situation, a fast PN code acquisition method was proposed. The acquisition method based on high-folded digital matched filter(DMF) and FFT is able to convert the traditional two-dimensional search method to one-dimensional search. The realization frame of 32-folder DMF in FPGA was put forward. The simulation focused on the folder multiple and system resource shows that the larger the folder multiple is, the lesser the system resource costs. When the input signal SNR is -20 dB, the acquisition speed of this method is much faster than the traditional methods. This method has good characteristics of fast acquisition and system resource expended lower. Practical engineering verification shows that it can be used in high dynamic situation.
Keywords�� receiver   fast Fourier transforms(FFT)   field programmable gate arrays(FPGA)     
Received 2006-08-10;
About author: �� ��(1975-),��,����������,��ʿ��,xufeng.ee@gmail.com.
���, �۶���, �����.һ�ָ߶�ֱ̬�����ջ������벶�񷽷�[J]  �������պ����ѧѧ��, 2007,V33(06): 672-676
Xu Feng, Shao Dingrong, Li Shujian.Fast PN code acquisition for DSSS receiver in high dynamic situation[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2007,V33(06): 672-676
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