Parametric estimation of UWB signals with sub-Nyquist sampling

Pistea, Ana-Maria; Nicolaescu, Ioan; Rădoi, Emanuel; Tuta, Leontin

doi:10.1109/isscs.2015.7204002

Cited by 2 publications

(1 citation statement)

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“…The time-domain waveforms of these four kinds of nonband-limited signals are reconstructed by using signal peak amplitude and time of arrival, estimated by using a spectral analysis algorithm with sparse sampling data. After some years of development, FRI sampling theory has been applied to the fields of ultra-wideband communication [2,3], GPS [4], radar [5], medical ultrasonic imaging [6][7][8][9] and industrial ultrasonic testing [10,11]. However, FRI sampling theory is still at the theoretical discussion stage; the sparse data used by researchers is obtained from Nyquist sampling data-socalled 'second sampling'.…”

Section: Introductionmentioning

confidence: 99%

Quadrature demodulation based circuit implementation of pulse stream for ultrasonic signal FRI sparse sampling

Song

Zhou

2017

Meas. Sci. Technol.

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Converting ultrasonic signal to ultrasonic pulse stream is the key step of finite rate of innovation (FRI) sparse sampling. At present, ultrasonic pulse-stream-forming techniques are mainly based on digital algorithms. No hardware circuit that can achieve it has been reported. This paper proposes a new quadrature demodulation (QD) based circuit implementation method for forming an ultrasonic pulse stream. Elaborating on FRI sparse sampling theory, the process of ultrasonic signal is explained, followed by a discussion and analysis of ultrasonic pulse-stream-forming methods. In contrast to ultrasonic signal envelope extracting techniques, a quadrature demodulation method (QDM) is proposed. Simulation experiments were performed to determine its performance at various signal-to-noise ratios (SNRs). The circuit was then designed, with mixing module, oscillator, low pass filter (LPF), and root of square sum module. Finally, application experiments were carried out on pipeline sample ultrasonic flaw testing. The experimental results indicate that the QDM can accurately convert ultrasonic signal to ultrasonic pulse stream, and reverse the original signal information, such as pulse width, amplitude, and time of arrival. This technique lays the foundation for ultrasonic signal FRI sparse sampling directly with hardware circuitry.

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