CAJ | 학술논문

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。
위료해결전통적PMF-FFT( Partial Match Filter-Fast Fourier Transform)포획산법재신호포획방면적불족，제출료일충신적기우PMF-FFT적시빈역쌍병행포획방안。대PMF가개진적한저창，통과조정창계수，선택최우화적삼수，감소료포획계통수출증익적쇠감。이용FFT빈보분석적특점，대FFT적수입진행합리보령，수출가개진적한저창，조정창계수，기본상소제료선패손실。이론분석화MATLAB방진결과증명，해방안재진량불증가계통복잡도적정황하제고료포획속도화빈솔고계정도，능구괄응다보륵빈편교대적확빈위마쾌속포획。
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-frequen-cy domain based on PMF-FFT. The acquisition system output gain attenuation is reduced by adding im-proved Hanning window to PMF and selecting the optimal parameters. Based on FFT spectrum analysis fea-tures,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 re-sults show that the proposed method not only improves the acquisition speed and frequency estimation accu-racy without increasing system complexity as much as possible, but also adapts to large Doppler shift of spreading pseudo-code fast acquisition.