| 摘要: |
| 为了解决传统的PMF-FFT(Partial Match Filter-Fast Fourier Transform)捕获算法在信号捕获方面的不足，提出了一种新的基于PMF-FFT的时频域双并行捕获方案。对PMF加改进的汉宁窗，通过调整窗系数，选择最优化的参数，减小了捕获系统输出增益的衰减。利用FFT频谱分析的特点，对FFT的输入进行合理补零，输出加改进的汉宁窗，调整窗系数，基本上消除了扇贝损失。理论分析和MATLAB仿真结果证明，该方案在尽量不增加系统复杂度的情况下提高了捕获速度和频率估计精度,能够适应多普勒频偏较大的扩频伪码快速捕获。 |
| 关键词: 高动态扩频信号 时频域双并行捕获 PMF-FFT 多普勒频移 加改进窗 |
| DOI： |
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| 基金项目:陕西省教育厅自然科学研究基金项目(2011JM8038) |
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| Parallel acquisition in time-frequency domain based on PMF-FFT |
| WANG Yan-yan,GE Hai-bo,WANG Wen-ting |
| () |
| Abstract: |
| In order to improve the performance of traditional PMF-FFT(Partial Match Filter-Fast Fourier Transform) acquisition algorithm,this paper presents a new parallel acquisition algorithm in time-frequency domain based on PMF-FFT.The acquisition system output gain attenuation is reduced by adding improved Hanning window to PMF and selecting the optimal parameters.Based on FFT spectrum analysis features,through filling zeros in FFT input and adding the improved window to FFT output and selecting the optimal parameters,the scallops loss is almost eliminated.Theoretical analysis and MATLAB simulation results show that the proposed method not only improves the acquisition speed and frequency estimation accuracy without increasing system complexity as much as possible，but also adapts to large Doppler shift of spreading pseudo-code fast acquisition. |
| Key words: high dynamic spread spectrum signal parallel acquisition in time-frequency domain PMF-FFT Doppler frequency shift adding improved window |
