摘要
高动态扩频测控系统中,基于FFT的伪码捕获算法存在"栅栏效应"影响频偏估计精度。为了解决这个问题,提出了一种新的频率估计算法,采用扩频调制信息消除策略和分段相关FFT频谱分析技术实现频偏精确估计。理论分析和仿真结果表明,改进算法相比于已有的FFT算法可以很好地提高频偏估计精度,改善"栅栏效应",并且具有较低的实现复杂度。
The ＂Picket Fence Effect＂ of the FFT-based code acquisition scheme for high dynamic DS/SS TT＆C signals will degrade the accuracy of the frequency offset estimation. To solve this problem, a new method of frequency offset estimation is proposed. This method adopts modulated data elimination technique and the segmental correlation FFI＇ algorithm. Both analysis and simulation demonstrate that the proposed method can well improve the accuracy of the frequency offset estimation compared with the existing FUF- based code acquisition scheme, with moderate comoutational comolexitv,
出处
《测控技术》
CSCD
2008年第1期85-87,共3页
Measurement & Control Technology
基金
国家自然科学基金(60532070)
清华-Intel联合研究资助项目
关键词
直接序列扩频
多普勒频移
栅栏效应
分段相关
快速傅里叶变换
direct-sequence spread-spectrum （DS/SS）
Doppler frequency shift
picket fence effect
segmental correlation
fast Fou-rier transform （FFT）
