高动态单频干扰环境下的FFT直扩捕获方案  

An FFT-based DSSS acquisition strategy in high dynamic and CW jamming environment

作　　者：张一[1] 张中兆[1] 沙学军[1] 

机构地区：[1]哈尔滨工业大学通信技术研究所,哈尔滨150001

出　　处：《哈尔滨工业大学学报》2007年第9期1431-1435,共5页Journal of Harbin Institute of Technology

摘　　要：在FFT直扩捕获算法的基础上,利用FFT频域分析的优势,增加频域干扰消除单元和频率扫描单元,提高系统的抗单频干扰能力,增加对多普勒频率变化搜索的范围,将传统的频-码二维搜索捕获降低到一维捕获,成倍地缩短了捕获时间,对长周期或无周期伪码捕获有较高的优势,并更适合于高动态有单频干扰环境.最后以GPS系统为例进行了算法仿真验证,其结论对发展我国自己的卫星导航定位系统有着重要的指导意义.An approach to improve anti-cw-jam capability and extend doppler frequency scan range was proposed. The strategy took the advantage of the FFT frequency-domain analysis and added a frequency-domain jam-remove unit and a frequency-scan unit to the traditional FFT DSSS acquisition. Then the traditional frequency-code two-dimension search was reduced to one-dimension search, which is much helpful to the acquisition of long period and aperiod code, and is more suitable for high dynamic and CW jamming environment. At last, simulations confirm the analysis results by GPS system, which are valuable to satellite navigation system.

关 键 词：FFT 循环相关 高动态 抗干扰 

分 类 号：TN914.42[电子电信—通信与信息系统]