Application of Chirp-z Transform in Doppler Weather Radar

2014 ◽  
Vol 513-517 ◽  
pp. 4265-4268
Author(s):  
Jun Zhu ◽  
Xiao Jia Lu ◽  
Xiang Liu
Keyword(s):  
Signal Processing ◽  
Fourier Transform ◽  
Fast Fourier Transform ◽  
Measurement Accuracy ◽  
Weather Radar ◽  
Doppler Weather Radar ◽  
Transform Method ◽  
Fast Fourier Transform Method ◽  
Sampling Points ◽  
Signal Processing Methods

Among the signal processing methods of Doppler weather radar, the FFT (Fast Fourier Transform) method is widely used. If the measurement accuracy needs to be improved, the number of FFT points also needs to be increased. As a result, the amount of computation increases exponentially. Chirp-z transform can directly refine certain spectrum in the spectrum of weather echoes. In the case that the sampling points and the amount of computation increase fewer, the measurement accuracy can be greatly advanced.

Discussion of Short-Wavelength Laser Beam Focus Using Fast Fourier Transform Method

2011 ◽  
Vol 31 (5) ◽  
pp. 0507001
Author(s):  
杨美霞 Yang Meixia ◽  
钟鸣 Zhong Ming ◽  
任钢 Ren Gang ◽  
何衡湘 He Hengxiang ◽  
刘文兵 Liu Wenbing ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Laser Beam ◽  
Fast Fourier Transform ◽  
Short Wavelength ◽  
Transform Method ◽  
Fourier Transform Method ◽  
Fast Fourier Transform Method

Impact tensile behavior analysis of Twaron fiber tows from fast Fourier transform

2018 ◽  
Vol 89 (8) ◽  
pp. 1363-1370
Author(s):  
Lvtao Zhu ◽  
Guocheng Zhu ◽  
Jianyong Feng ◽  
Limin Jin ◽  
Pibo Ma
Keyword(s):  
Fourier Transform ◽  
Strain Rate ◽  
Fast Fourier Transform ◽  
Failure Strain ◽  
Amplitude Spectrum ◽  
Strain Rates ◽  
Transform Method ◽  
Fast Fourier Transform Method ◽  
Split Hopkinson ◽  
Specific Frequency

In this study, tensile experiments of Twaron fiber tows under different strain rates (quasi-static: 0.001 s−1, dynamic: 800–2400 s−1) were tested with an MTS materials tester (MTS 810.23) and a split Hopkinson tension bar, respectively. The results showed that the mechanical properties of the Twaron fiber tows were sensitive to strain rate: the stiffness and failure stress of the fiber tows increased distinctly as the strain rate increased, while the failure strain decreased. From scanning electron microscope photographs of the fracture surface, it is evident that the Twaron fiber tows failed in a tougher mode and the axial split became more severe as the strain rate increased. The tensile behaviors of the Twaron fiber tows were analyzed in the frequency domain using the fast Fourier transform method. The amplitude spectrum and power of energy absorption of the Twaron tows were concentrated in a specific frequency range and increased with strain rate.

Sign in / Sign up

Export Citation Format

Share Document