Abstract
This letter addresses the design and implementation of a monitoring station for Global Navigation Satellite Systems signals based on the software-defined radio paradigm. The monitoring platform exploits a digital data grabber based on the use of Universal Software Radio Peripheral devices and a satellite navigation fully software receiver; with respect to a traditional commercial receiver, this implementation solution grants a higher level of flexibility for the processing strategy, enabling the possibility of a deeper analysis of the signals in case of meaningful events, such as ionospheric scintillations or radio frequency interference, through the storage of raw samples. Such an implementation approach yields valuable advantages in critical and remote areas, such as polar regions, where resources are limited and installation, maintenance, and replacement of hardware may be critical.
Highlights
I N recent times, the increased use of Global Navigation Satellite System (GNSS) for a widespread of applications and services has clearly highlighted how one of the essential performance metric to take into account is the reliability of the estimation of the user position
GNSS raw Intermediate Frequency (IF) data affected by scintillation events have been post-processed by means of software receiver to compute the scintillation indices
This paper described the design and implementation of a monitoring station for satellite navigation signals based on the Software Defined Radio (SDR) technology as an alternative to commercial hardware receivers
Summary
I N recent times, the increased use of Global Navigation Satellite System (GNSS) for a widespread of applications and services has clearly highlighted how one of the essential performance metric to take into account is the reliability of the estimation of the user position It is well know, that the signals that are currently broadcast for civil use by the GNSSs are not granted. Autonomous integrity monitoring algorithms at receiver level, such as the Receiver Autonomous Integrity Monitoring (RAIM), have been designed since a long time [1] These algorithms monitor the pseudorange quality, to detect anomalies in the measurement and possibly exclude them from the positioning procedure. The use of Software Defined Radio (SDR) approach allows the development of low-cost sensors, that can be used to collect raw samples of the received signals, and tailored architectures of GNSS processors, in
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