Search results for "software receiver"

showing 3 items of 3 documents

A software receiver phase lock loop analysis and design to implement adaptive phase tracking using a finite impulse response loop filter

2009

In this paper we analyze the design of a digital Phase Lock Loop (PLL) for a Global Navigation Satellite System (GNSS) software receiver. Even if the topic of phase tracking has been widely studied, we found it useful to provide a short walkthrough for the design of a PLL in a real software receiver, avoiding to introduce the common theoretical phase-based model and aiming to the practical implementation of a system that deals with frequencies. Nonetheless, our analysis and design will grow away from the canonical approach, in the way that we will not resort to analog filter theory. The result is a PLL which is more reactive than the ones usually found in literature and that implements a si…

Phase lock loop software receiver trackingSettore ING-INF/03 - TelecomunicazioniGNSS PLL
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A software receiver adaptive phase lock loop method

2009

The aim of this paper is to introduce a new and relatively simple algorithm which is capable to tune the parameters of the loop filter in a phase lock loop, like the one that can be found in a global navigation satellite system receiver. The parameters are chosen while the system is running, in order to make the bandwidth of the filter adaptive with respect to the signal dynamic and strength. A wider bandwidth is obtained to make the filter more reactive when searching the carrier, while the bandwidth gets narrower when the system is in the tracking state, in order to cut off as much noise as possible. The algorithm is based on the observation of the estimated variance of the phase lock loo…

phase lock looploop filterSettore ING-INF/03 - Telecomunicazionisoftware receiversoftware receiver phase lock loop adaptive filter loop filterGNSS PLL; software receiver; phase lock loop; adaptive filter; loop filterGNSS PLLadaptive filter
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Signal Quality Monitoring: Correlation mask based on Ratio Test metrics for multipath detection

2009

In any measurement process, the observation is error affected: calibration and careful measuring procedures can reduce the error components but are unable to completely eliminate them. The capability to monitor and to detect any disturbances on the spreading sequences transmitted by the satellites is then of primary importance. Quality Control techniques based on a modified tracking architecture, which provides a certain number of correlator outputs, are analysed in this paper. Such outputs are used to build a metric used to monitor in real-time the reliability of the signal being tracked. In literature, several definitions of metrics can be found. The mainly used metrics are based on the f…

Quality Control Multipath Software Receiver
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