LI Wulin,WANG Tianbao.Double Parallel Acquisition Algorithm in Time-frequency Domain basedon Interpolation Compensation Method[J].Journal of Chengdu University of Information Technology,2024,39(04):404-408.[doi:10.16836/j.cnki.jcuit.2024.04.002]
基于内插补偿法的时域频域双并行捕获算法
- Title:
- Double Parallel Acquisition Algorithm in Time-frequency Domain basedon Interpolation Compensation Method
- 文章编号:
- 2096-1618(2024)04-0404-05
- Keywords:
- matched filter; fast Fourier transform; time-frequency double parallel acquisition; scallop loss; interpolation compensation
- 分类号:
- TN911.72
- 文献标志码:
- A
- 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。
- Abstract:
- 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-sampling the intermediate frequency signal and employing a matched filter for segmentation, the acquisition speed is significantly accelerated. PMF and FFT are windowed and the optimal tuning coefficient is selected. Simultaneously, it employed 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 acquisition algorithm based on the interpolation compensation method balances acquisition speed and hardware resource consumption, improves the acquisition accuracy, basically eliminates the fence effect, and is suitable for the acquisition of spread spectrum signals with large Doppler frequency offset.
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备注/Memo
收稿日期:2023-05-24
基金项目:四川省科技计划资助项目(2021YFS0395)