基于内插补偿法的时域频域双并行捕获算法  

Double Parallel Acquisition Algorithm in Time-frequency Domain based on Interpolation Compensation Method

作　　者：黎武林 王天宝[1] LI Wulin;WANG Tianbao(College of Communication Engineering,Chengdu University of Information Technology,Chengdu 610225,China)

机构地区：[1]成都信息工程大学通信工程学院,四川成都610225

出　　处：《成都信息工程大学学报》2024年第4期404-408,共5页Journal of Chengdu University of Information Technology

基　　金：四川省科技计划资助项目(2021YFS0395)。

摘　　要：针对传统PMF-FFT(partial matched filter-fast fourier transform)捕获算法在高动态大多普勒频移捕获时扇贝损失严重,多普勒频移估计精度低等问题,提出一种基于内插补偿法与改进PMF-FFT融合双并行捕获算法,通过对中频信号二次采样,利用匹配滤波器进行分段从而加快捕获速度。对PMF和FFT同时进行加窗并选择最优调谐系数,同时利用二次函数内插法,对结果插值补偿,提高频偏估计精度,基本消除栅栏效应。仿真结果表明,该算法兼顾捕获速度和硬件资源消耗的同时,提高了捕获精度,基本消除栅栏效应,适用于大多普勒频偏的扩频信号捕获。Aiming at the problem of serious scallop loss and low Doppler shift accuracy in the traditional partial matched filter-fast Fourier transform acquisition algorithm when capturing high dynamic large Doppler shift,this paper proposed a double parallel acquisition algorithm based on interpolation compensation method and improved PMF-FFT.By re-sam-pling the intermediate frequency signal and employing a matched filter for segmentation,the acquisition speed is signifi-cantly accelerated.PMF and FFT are windowed and the optimal tuning coefficient is selected.Simultaneously,it em-ployed the quadratic function interpolation method compensating the results,which improved the accuracy of frequency offset estimation and eliminated the fence effect.The simulation results reflect that the proposed double parallel acquisi-tion algorithm based on the interpolation compensation method balances acquisition speed and hardware resource con-sumption,improves the acquisition accuracy,basically eliminates the fence effect,and is suitable for the acquisition of spread spectrum signals with large Doppler frequency offset.

关 键 词：匹配滤波器 快速傅里叶变换 时频双并行捕获 扇贝损失 内插补偿 

分 类 号：TN911.72[电子电信—通信与信息系统]