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PRELIMINARY RESULTS ON HIGH DYNAMICS GIOVE-A SIGNALS
No full textGlobal Navigation Satellite System (GNSS) receivers for space applications need tobe accurately designed considering
the severe constraints forced by the utilization of a localization receiver in space environment. To work in this scenario,
spaceborne receivers must undergo significant constraints, as low weight, reduced power consumption as well as the
capability of processing signals affected by high Doppler shifts and Doppler rates.
The impact of the modernized GNSS signalstructures on spaceborne receiver performances has to be investigated. This
paper describes the High-Dynamics (HD) software signal generator developed at the Navigation Lab at Politecnico di
Torino within the GREHDA project, and presents the first analysis performed on HD simulated GIOVE-A signals,
compared to non HD signals (simulated and real)
Asymptotic distributions of kappa statistics and their differences with many raters, many rating categories and two conditions
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Time-frequency analysis of the endocavitarian signal in paroxysmal atrial fibrillation
No full textWe apply the time-frequency analysis to the endocavitarian signal of patients suffering from paroxysmal atrial fibrillation. The time-frequency spectrum reveals the components of the endocavitarian signal. These components are located in the regions of the time-frequency domain that differ for in-rhythm and in-atrial fibrillation signals. By using experimental data, we perform a statistical study of these regions, and we obtain their average value. The difference in the shape of these regions is caused by the re-entry circuits that characterize atrial fibrillation. We propose a propagation model for atrial fibrillation based on the re-entry circuits, which explains the shape of the time-frequency spectrum
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