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Gated Quadrature Synchronous Detection (GQSD) is a new signal processing method for pulse signal detection, which combines the principles of “gating” and “synchronous demodulation” that outperforms the existing ones.

For low duty cycle pulse trains, the sensitivity and efficiency of CQSD is greatly reduced because of the increased energy spread across the spectrum, leading to deterioration in the SNR. SMGI is the method of choice for pulsed signals, but does not offer immunity against 1/f noise and, when the latter is overwhelming, CQSD becomes the better choice.

GQSD is efficient against 1/f noise and hence improves the output SNR. It incorporates a gating function to achieve signal conditioning suitable for synchronous detection, while the QSD function ensures maximum suppression of flicker noise. An advantage of applying GQSD with low bandwidth devices, such as a PED, will be that it allows a nominally slow detector to be exploited at higher than usual frequencies. This is possible, since gained reserve in SNR can be traded against sensitivity, e.g. by reducing the electrical time constant.

If you would like more technical information about GQSD, please email Professor Krikor Ozanyan (k.ozanyan@manchester.ac.uk).

GQSD (Gated Quadrature Synchronous Demodulation)

A signal processing method for pulse signal detection

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