CAJ | 학술논문

为了解决高动态直扩信号捕获速度与资源消耗的矛盾，分析了部分匹配滤波结合快速傅里叶变换( PMF-FFT)的捕获性能。针对PMF-FFT捕获范围有限且占用硬件资源过多的问题，采用递归折叠匹配滤波器代替常规匹配滤波器的方法大大节省了硬件资源，并行FFT保证了其捕获速度，同时采用扫频方法成倍增加了频偏捕获范围。给出了该方法的FPGA设计结构与实现结果，验证了该方法的有效性。与FFT循环卷积方法相比，在频偏捕获范围一定的前提下，所提方法捕获速度快，占用资源较少，非常适合高动态直扩信号的快速捕获。
위료해결고동태직확신호포획속도여자원소모적모순，분석료부분필배려파결합쾌속부리협변환( PMF-FFT)적포획성능。침대PMF-FFT포획범위유한차점용경건자원과다적문제，채용체귀절첩필배려파기대체상규필배려파기적방법대대절성료경건자원，병행FFT보증료기포획속도，동시채용소빈방법성배증가료빈편포획범위。급출료해방법적FPGA설계결구여실현결과，험증료해방법적유효성。여FFT순배권적방법상비，재빈편포획범위일정적전제하，소제방법포획속도쾌，점용자원교소，비상괄합고동태직확신호적쾌속포획。
To solve contradictions between acquisition speed and resource consumption of high dynamic di-rect-sequence spread spectrum( DSSS) signals,this paper analyzes the performance of PMF-FFT( Part of the Matched Filtering combined with Fast Fourier Transform) method. For the disadvantage that this meth-od has limited scope of frequency acquisition and high hardware resource consumption,this paper replaces conventional matched filter by recursive and folded matched filter,resulting in saving hardware resources largely. Parallel FFT is used for ensuring the speed of acquisition. Frequency sweeping to extend scope of the frequency deviation is adopoted. The structure and FPGA implementation are discussed and the result proves the effectiveness of the proposed method. Compared with the FFT circular convolution method in certain capture range offset,the proposed method has faster acquisition speed,less resource consumption, which is well-suited for fast acquisition of high dynamic DSSS signals.