高动态DS/FH混合扩频系统实现长伪码快速捕获的一种方法  

A Method Realizing Rapid Acquisition of Long PN Code in High Dynamic DS/FH Spread Spectrum System

作　　者：张倩[1] 李署坚[1] 丁晓宇[1] 王丹志[1] 

机构地区：[1]北京航空航天大学电子工程学院,北京100083

出　　处：《遥测遥控》2004年第2期28-31,共4页Journal of Telemetry,Tracking and Command

摘　　要：针对长伪码与快速捕获的矛盾 ,设计了一种基于 FPGA技术的数字匹配滤波器 ,用于在高动态、低信噪比的 DS/ FH混合扩频系统中实现快速捕获。考虑多普勒频移的影响采用频率和码相位二维搜索。对将进入数字匹配滤波器的数据进行了降速处理 ,大大节省了硬件资源。仿真结果证明 。Aiming at the contradiction between long PN code and rapid acquisition,a digital matched filter based on FPGA technology is designed in order to rapidly acquire PN code in a DS/FH spread spectrum system of low SNR in high dynamic surrounding.Considering the affection of Doppler,the two dimensions searching in both frequency and code phase is applied.The speed of the data is descended before data entering the DMF,so the hardware is greatly reduced.The simulation testifies that the digital matched filter could realize rapid acquisition of the long PN code in high dynamic environment.

关 键 词：混合扩频系统 快速捕获 FPGA(FieldProgrammableGateArray) 数字匹配滤波器(DMF) 

分 类 号：TN914.42[电子电信—通信与信息系统]