| 基于Chirp-z变换的电波流速仪的测量精度研究 |
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| 引用本文： | 李秀丽,刘纪元,焦学峰,陈飞虎.基于Chirp-z变换的电波流速仪的测量精度研究[J].国外电子元器件,2014(10):188-190. |
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| 作者姓名： | 李秀丽 刘纪元 焦学峰 陈飞虎 |
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| 作者单位： | [1]沈阳航空航天大学电子信息工程学院,辽宁沈阳110136 [2]中国科学院声学研究所综合声纳实验室,北京100080 [3]北京航瑞博泰科技有限公司,北京100102 |
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| 摘 要： | 测速中对回波信号的处理大多采用FFT方法测频。为了提高测量精度,需要增加采样点数,这样使得运算量增大。提出了一种局部细化方法,通过FFT找出感兴趣的某一频率范围,再对该段进行Chirp-z变换,也就是说在不增加采样点数,运算量增加不大的前提下,提高测量精度。实验结果表明,这种细化方法能够有效提高测量精度。
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| 关 键 词： | 测速 多普勒 测量精度 Chirp-z变换 FFT |
Research on measuring accuracy of electromagnetic wave velocity based on Chirp-z |
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| LI Xiu-li,LIU Ji-yuan,JIAO Xue-feng,CHEN Fei-hu.Research on measuring accuracy of electromagnetic wave velocity based on Chirp-z[J].International Electronic Elements,2014(10):188-190. |
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| Authors: | LI Xiu-li LIU Ji-yuan JIAO Xue-feng CHEN Fei-hu |
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| Affiliation: | 1. College of Electronics and Information Engineering, Shenyang A erospaee University , Shenyang 110136, China 2. Institute of Acoustics , Chinese Academy of Science, Beijing 100080, China; 3. Beijing HangRuiBoTai Science＆Technology Co., Ltd, Beijing 100102, China) |
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| Abstract: | FFT is usually used to processing echo signal in velocity measurement system. In order to improve the measuremen~ accuracy, the sample points should be increased, which caused the computation to increase. A method of refining the local spectrum is proposed. Finding our interesting frequency range, then, processing the spectrum in this range by using Chirp-z. In other words, under the situation of not creasing sample points and computation, this method can improve the measurement accuracy. Experimental results show that this method can effectively improve measurement accuracy. |
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| Keywords: | velocity Doppler measuring accuracy Chirp-z turn FFT |
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