窗函数在ZPW-2000移频信号频率检测中的应用

Application of window function in frequency detection of ZPW-2000 shift frequency signal

窗函数是数字信号处理中的常用工具,在信号频谱分析中可以用来抑制频谱能量泄露。在ZPW-2000移频信号的频率检测过程中,常常面临着时域截断造成的频谱能量泄露问题,某些情况下甚至会造成频谱混叠,影响频率检测精度,因此需要加窗处理。本文对几种常见窗函数的特性进行了比较,分析了凯泽窗在该信号频率检测中的特点,并给出了凯泽窗的相关设计参数。仿真和实验结果证明,利用本文设计的凯泽窗可以在ZPW-2000所有调制低频的情况下抑制频谱混叠,提高频率检测精度。

Window function is one of the most popular tools in digital signal processing,which can be used to inhibit spectrum leakage in the spectrum analysis. The problem of spectrum leakage is often confronted in the frequency detection of ZPW-2000 frequency-shift keying signal, in some case even leads to spectrum aliasing and influences the accuracy, so the window is needed. This paper compared to several common window function, analyzed the characteristics of the Kaiser window and gived the relevant design parameters. The experimental result shows that the Kaiser window designed in this paper could inhibit spectrum leakage and improve the accuracy of frequency detection on all of the module frequencys of ZPW-2000 signal.