Band Width and Transmission Performance

Feldman, C.B.; Bennett, W. R.

doi:10.1002/j.1538-7305.1949.tb03646.x

Cited by 31 publications

(3 citation statements)

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“…The thick solid lines in Fig. 2 represent the minimum sampling frequency required for a bandpass signal [10]. To make the sampling frequency as low as possible, it is hereinafter assumed that (2) in this paper [11], [12].…”

Section: B Relationship Between Input Signal and Sampling Frequencymentioning

confidence: 99%

A fast algorithm for high-accuracy frequency measurement: application to ultrasonic Doppler sonar

Susaki

2002

IEEE J. Oceanic Eng.

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Abstract-In an attempt to investigate the technical feasibility of a CW Doppler sonar, we have examined a method of measuring low velocities with a high-velocity resolution, or frequency resolution, by use of a simple circuit configuration employing digital signal processing technique. The following discussion presents the results of the investigation. In the measuring method described below, the fast Fourier transform (FFT) of undersampled data is calculated and the Doppler shift is obtained by searching for a peak frequency of the power spectrum. To achieve the intended frequency resolution of 1 Hz by FFT operation, measurement of data for a minimum measuring period of 1 s is essential. If the sampling frequency is set to 50 kHz, the number of samples obtained during the minimum measuring period of 1 s would amount to 50 000. This is not practical in light of the time required for the FFT operation. To overcome this problem, our new measuring method employs a decimation technique for reducing the number of samples down to 1024 while maintaining a frequency resolution of about 1 Hz. This paper describes how the processing time can be drastically reduced to about 1/300th compared to the conventional technique by a combination of complex exponential functions, filtering and decimation, and thereby indicates the possibility of real-time CW Doppler data processing.

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Section: B Relationship Between Input Signal and Sampling Frequencymentioning

confidence: 99%

A fast algorithm for high-accuracy frequency measurement: application to ultrasonic Doppler sonar

Susaki

2002

IEEE J. Oceanic Eng.

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“…Bandpass sampling, which has been applied to continuous frequency spectra [17]- [19], was applied to discrete frequency spectra. Different formulas of sampling are used in four cases of M separated by the modulus of 4 [16].…”

Section: Introductionmentioning

confidence: 99%

Novel One-Dimensional Sampling Method to Calculate Two-Dimensional Diamond-Shaped Discrete Frequency Distributions

Hori

2014

IEEE Trans. Circuits Syst. II

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Section: B Relationship Between Input Signal and Sampling Frequencymentioning

confidence: 99%

A fast algorithm for high-accuracy frequency measurement. Application to ultrasonic Doppler sonar

Susaki

Proceedings of the 2000 International Symposium on Underwater Technology (Cat. No.00EX418)

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In an attempt to investigate the technical feasibility of a CW Doppler sonar, we have examined a method of measuring low velocities with a high-velocity resolution, or frequency resolution, by use of a simple circuit configuration employing digital signal processing technique. The following discussion presents the results of the investigation. In the measuring method described below, the fast Fourier transform (FFT) of undersampled data is calculated and the Doppler shift is obtained by searching for a peak frequency of the power spectrum. To achieve the intended frequency resolution of 1 Hz by FFT operation, measurement of data for a minimum measuring period of 1 s is essential. If the sampling frequency is set to 50 kHz, the number of samples obtained during the minimum measuring period of 1 s would amount to 50 000. This is not practical in light of the time required for the FFT operation. To overcome this problem, our new measuring method employs a decima-tion technique for reducing the number of samples down to 1024 while maintaining a frequency resolution of about 1 Hz. This paper describes how the processing time can be drastically reduced to about 1/300th compared to the conventional technique by a combination of complex exponential functions, filtering and decimation, and thereby indicates the possibility of real-time CW Doppler data processing.

show abstract

Band Width and Transmission Performance

Cited by 31 publications

References 0 publications

A fast algorithm for high-accuracy frequency measurement: application to ultrasonic Doppler sonar

A fast algorithm for high-accuracy frequency measurement: application to ultrasonic Doppler sonar

Novel One-Dimensional Sampling Method to Calculate Two-Dimensional Diamond-Shaped Discrete Frequency Distributions

A fast algorithm for high-accuracy frequency measurement. Application to ultrasonic Doppler sonar

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