Title :
Pulse Detection by Gated Synchronous Demodulation
Author :
Efthymiou, Spyros ; Ozanyan, Krikor B.
Author_Institution :
Sch. of Electr. & Electron. Eng., Univ. of Manchester, Manchester, UK
Abstract :
Synchronous demodulation (SD) is the signal recovery method of choice when the input envelope signal is modulated by either a pure sine wave or a square wave. SD is less efficient for pulsed periodic signals with a low duty factor. For the latter signals, we introduce data processing that applies gating on a part of the signal period to achieve optimum conditions for recovering the pulse amplitude by quadrature SD. The proposed method is evaluated for signal-to-noise performance against Boxcar-type gated integrators in simulated data, as well as data acquired from physical measurements, in the presence of 1/f and Gaussian noise. It is shown that by combining the gating and SD principles, our suggested gated SD outperforms other routine signal processing methods under typical 1/f noise conditions.
Keywords :
1/f noise; Gaussian noise; demodulation; pulse amplitude modulation; quadrature amplitude modulation; signal detection; 1/f noise condition; Gaussian noise; boxcar-type gated integrator; data acquisition; data processing; gated synchronous demodulation; input envelope signal modulation; pulse amplitude; pulsed periodic signal detection; quadrature SD; signal processing method; signal recovery method; signal-to-noise performance; sine wave; square wave; Gated integration; pulse detection; quadrature detection; synchronous demodulation;
Journal_Title :
Sensors Journal, IEEE
DOI :
10.1109/JSEN.2013.2263496