摘要
针对在高动态环境下PMF-FFT(partial Matched filter-fast fourier transform)伪码捕获算法出现多普勒频偏估计精度不足的问题,提出了PMF-FFT和二次函数函数内插结合的捕获新算法。新算法通过二次函数内插校正PMF-FFT算法的功率谱最大值,提高了多普勒频偏估算值。理论分析和仿真结果表明,所提算法在不改变原系统复杂度的情况下,通过软件算法克服栅栏效应而引起的峰值衰减,多普勒频偏估算精度在原算法的基础上提高了约12 dB左右。
Aiming at low accuracy of the Doppler-shift estimation of PMF-FFT (partial Matched filter-fast fourier transform) algorithm in the high dynamic environment,this paper proposed a new acquisition algorithm that combines PMF-FFT and quadratic function interpolation method according to the analysis of PM F-FFT algorithm. A more accurate Doppler shift was obtained by correcting the maximum power of spectrum after FFT through quadratic function interpolation method. The analysis and simulation show that the proposed method can overcome the peak attenuation caused by the barrier effect through the software algorithms without changing the complexity of original system. The estimation accuracy was increased by about 12 dB than original algorithm.
作者
黄明军
王永民
牛家红
HUANG Mingjun;WANG Yongmin;NIU Jiahong(Information and Navigation College, Air Force Engineering University,Xi'an 710077, China)
出处
《应用科技》
CAS
2016年第4期46-49,56,共5页
Applied Science and Technology
基金
国家自然科学基金项目(61001111)
关键词
高动态
捕获
PMF-FFT
内插函数
估算精度
high dynamic
acquisition
PM F-FFT
interpolation function
estimation accuracy
