Effects of fast Fourier transform window size on the target strength spectra of tungsten carbide spheres

Effects of fast Fourier transform window size on the target strength spectra of tungsten carbide spheres
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快速傅里叶变换窗口大小对碳化钨球目标强度谱的影响

DOI:
10.1007/s12562-022-01653-7
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发表时间:
2023
期刊:
影响因子:
1.9
通讯作者:
Kazuo Amakasu
Kazuo Amakasu
中科院分区:
农林科学4区
文献类型:
--
作者:
Jing Liu;Burak Saygili;Akira Iwasa;Natsuki Yamamoto;Tomohito Imaizumi;Kazuo Amakasu

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快速傅里叶变换(FFT)的窗口大小(WS)是利用宽带回波波形计算目标强度谱的重要参数之一。然而,FFT WS对TS光谱的影响还没有得到充分的研究。因此,在研究鱼类回波之前,我们主要研究了碳化钨(WC)球的回波,碳化钨球通常被用作标定球。采用校准良好的Simrad EK80测深仪,采用55-90和90 - 170 khz线性调频发射信号,对不同直径的WC球进行回波采样。我们计算了每个ping和每个球的脉冲长度确定电平所定义的不同WSs的TS光谱。然后将计算(测量)的TS谱与基于精确模态级数解的预测TS谱进行比较。当FFT WS较窄时,由于实测TS谱上的波纹变大,实测TS谱与预测TS谱之间的差异有增大的趋势,而当FFT WS约为时,实测TS谱与预测TS谱之间的差异变小且趋于稳定。0.5米。我们最终得出结论,0.6 m FFT WS对于本文所研究的所有病例都是合理的。
The window size (WS) of the fast Fourier transform (FFT) is one of the important parameters when calculating target strength (TS) spectra from broadband echo waveforms. However, the effects of the FFT WS on TS spectra have not been thoroughly investigated. Before studying fish echoes, we thus focused on the echoes of tungsten carbide (WC) spheres, which are typically used as calibration spheres. A well-calibrated Simrad EK80 echosounder with 55–90 and 90–170-kHz linear frequency-modulated transmit signals were used for the echo sampling of WC spheres with different diameters. We calculated the TS spectra for different WSs defined by the pulse length determination level for each ping and each sphere. The calculated (measured) TS spectra were then compared with the predicted TS spectra based on the exact modal series solution. When the FFT WS was narrower, the differences between the measured and predicted TS spectra tended to increase because the ripples on the measured TS spectra became large, while the differences became small and stable above the FFT WS of approx. 0.5 m. We finally concluded that a 0.6-m FFT WS was reasonable for all cases examined herein.
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