基于LabVIEW的数字变频FFT设计
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摘要
在动目标速度测量的工程应用背景下,针对传统频谱细化技术计算量大和实现困难的缺点,提出一种数字变频FFT的频谱细化算法,并根据其数学原理,进行了基于LabVIEW的两种编程设计方法研究。仿真结果表明,两种设计方法都可满足信号分析中提高频率分辨率的要求,但与选择的细化倍数有关。由于具有编程简便和实用性强的优点,这两种实现方法均可广泛应用于汽车、飞机等运动目标的速度测量。
Under background of the project application of moving target velocity test,a spectrum precision method of digital frequency FFT are presented aiming at the shortcomings of large calculation and hard realization in traditional spectrum precision technology.According to the principle,two realization approaches based on LabVIEW are designed.The results of simulation indicate that both of the methods can meet with requirements of improving frequency resolution in the signal analysis and processing,but it is related to the precision parameter.Because the above methods have less restrictions and higher practicability,they can be widely applied to the velocity measurement of moving target including the automobile,the airplane and so on.
Under background of the project application of moving target velocity test,a spectrum precision method of digital frequency FFT are presented aiming at the shortcomings of large calculation and hard realization in traditional spectrum precision technology.According to the principle,two realization approaches based on LabVIEW are designed.The results of simulation indicate that both of the methods can meet with requirements of improving frequency resolution in the signal analysis and processing,but it is related to the precision parameter.Because the above methods have less restrictions and higher practicability,they can be widely applied to the velocity measurement of moving target including the automobile,the airplane and so on.
引文
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[2]黄采伦,余小华,陈安华,等.基于频谱细化的列车轮对轴承故障在线检测[J].中国工程科学,2007,9(7):61-63.
[3]李开成,曹雪凤.多相滤波器组的ZFFT算法在轨道电路信号检测中的应用[J].北方交通大学学报,2008,32(2):109-112.
[4]王力,张冰,徐伟.基于Matlab复调制ZOOM-FFT算法的分析和实现[J].舰船电子工程,2006,26(4):119-121.
[5]王兰炜,赵家骝,王子影,等.频率细化技术在超低频/极低频电磁信号检测中的应用[J].地震学报,2007,29(1):59-66.
[6]王卫江.改进的自适应Zoom-FFT算法研究[J].电子技术应用,2006(7):83-85.
[7]冯维婷.Chirp-Z变换在CW雷达高精度速度测量中的应用[J].电子科技,2007(9):6-7.
[8]丁康,潘成灏,李巍华.ZFFT与Chirp-Z变换细化选带的频谱分析对比[J].振动与冲击,2005,25(6):9-12.
[9]唐小军.实时信号处理-算法的实时性与算法-硬件映射[D].成都:电子科技大学,2003.
[10]荆双喜,张新红,冷军发.基于LabVIEW的频谱细化分析方法[J].新工艺新技术,2005(5):29-31.
[11]梅海清,冯毅.数字变频FFT在频谱分析中的应用[J].石油化工自动化,2003(1):57-58,64.
[12]杨乐平,李海涛,杨磊,等.LabVIEW程序设计与应用[M].2版.北京:电子工业出版社,2005.
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