基于FPGA的PN码捕获的设计及实现

PN码捕获技术是扩频通信的关键技术之一,针对扩频通信中长伪码序列的快速捕获问题,伪码相位大范围不确定的搜索,串行捕获需要大量的时间,这对实时性要求高的扩频接收机用户是无法忍受的,并行捕获电路结构比较复杂,实现起来有一定的难度,而且占用大量的资源。文中提出了一种基于FPGA的扩频信号快速滑动相关捕获方法,来解决低信噪比条件下长伪码序列的捕获问题。文中着重论述了该系统的FPGA实现原理,并且基于FPGA进行开发,调制出了该系统的仿真波形,达到了理想的效果,实际应用中有效地改善了系统的性能。

Design and Implementation of PN Code Acquisition Based on FPGA

The technique of PN code acquisition is the key technique in spread spectrum communication,Length for the problem of PN code rapid acquisition in spread spectrum communication,code phase search for a wide range of uncertainty.Serial acquisition requires a lot of time,this can not be tolerated for the real-time spread spectrum receiver of high users;the circuit of parallel to capture is more complex,it′s difficult to realize,and occupy much resource.The paper presents a spread spectrum signal acquisition speed sliding correlation method base on FPGA,to address the problem of capture long PN code under low SNR.Focus on discuss the FPGA implement principle of the system,and empolder base on FPGA,modulate the emulate wave of system,attain the ideal result,improve the system capability in practice apply.