Design of a Configurable Monitoring Station for Scintillations by Means of a GNSS Software Radio Receiver

Cristodaro, Calogero; Dovis, Fabio; Linty, Nicola; Romero, Rodrigo

doi:10.1109/lgrs.2017.2778938

Cited by 26 publications

(25 citation statements)

References 20 publications

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“…Data have been collected in Hanoi, Vietnam (11 • 20' N geo-magnetic latitude on 26 March and 2 April 2015. The measurements have been recorded by means of a Software Defined Radio (SDR) receiver and data grabber, as detailed in [28,29]. L1 C/A signals of 20 Global Positioning System (GPS) satellites were considered, corresponding to 169955 entries, recorded over a time interval of approximately 6 h, with a scintillation rate of 1:4.…”

Section: The Data Collectionsmentioning

confidence: 99%

Semi-Supervised GNSS Scintillations Detection Based on DeepInfomax

2020

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This work focuses on a machine learning based detection of ionospheric scintillation events affecting Global Navigation Satellite System (GNSS) signals. We here extend the recent detection results based on Decision Trees, designing a semi-supervised detection system based on the DeepInfomax approach recently proposed. The paper shows that it is possible to achieve good classification accuracy while reducing the amount of time that human experts must spend manually labelling the datasets for the training of supervised algorithms. The proposed method is scalable and reduces the required percentage of annotated samples to achieve a given performance, making it a viable candidate for a realistic deployment of scintillation detection in software defined GNSS receivers.

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Section: The Data Collectionsmentioning

confidence: 99%

Semi-Supervised GNSS Scintillations Detection Based on DeepInfomax

2020

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“…An SDR GNSS data grabber and receiver, similar to the one described by Cristodaro et al (), was installed in Adventdalen and was exploited for this work. Raw baseband samples of the GNSS signal were captured and digitalized through of a Universal Software Radio Peripheral (USRP) device and then postprocessed by means of a fully software non‐real‐time GNSS receiver, developed by the NavSAS group at Politecnico di Torino.…”

Section: Measurement Campaign Setup and Installationmentioning

confidence: 99%

“…Raw baseband samples of the GNSS signal were captured and digitalized through of a Universal Software Radio Peripheral (USRP) device and then postprocessed by means of a fully software non‐real‐time GNSS receiver, developed by the NavSAS group at Politecnico di Torino. GPS signals in the L1 band (1575.42 MHz) were captured and stored, as digital raw samples at 5·10 6 samples per second and at 8 bit per sample resolution, suitable for later postprocessing and analysis (Cristodaro et al, ). Working with self‐made data grabbers and receivers granted the complete access to each stage of the system architecture and enabled higher levels of flexibility and reconfigurability.…”

Section: Measurement Campaign Setup and Installationmentioning

confidence: 99%

“…Scintillation is declared present if σ ϕ exceeds a predefined thresholds, typically set to 0.25 rad (Dubey et al, ). Scintillation indexes are provided by professional Ionospheric Scintillation Monitoring Receivers (ISMRs); alternatively, customized software‐defined radio (SDR) GNSS data grabbers and fully software receivers can be used (Cristodaro et al, ; Linty et al, ). In this study an SDR‐based GNSS receiver is used to process the signals to compute the positioning solution and to estimate the phase index exploited for the scintillation analysis.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Phase Scintillation on the GNSS Positioning Error During the September 2017 Storm at Svalbard

et al. 2018

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In early September 2017, several space weather events triggered disturbed conditions of the near‐Earth space. The combination of two coronal mass ejection arrivals, associated with an X‐class flare, caused a strong geomagnetic storm on 7 and 8 September, thus inducing diffuse ionospheric phase scintillations on Global Navigation Satellite System (GNSS) signals. This work analyzes the effects and the actual impact of such phase scintillations on transionospheric Global Positioning System (GPS) signals and on related positioning accuracy. The research focuses in particular on high‐latitude GPS L1 data, recorded during a test campaign in Svalbard, Norway. The joint effect of satellites at low elevation and the exposure of ionosphere to the geospace forcing make navigation a critical task for such a challenging environment. Data analysis shows that the performance of carrier smoothing algorithms was affected by the presence of moderate and strong phase scintillation. It is shown in this study that positioning errors double when GPS signals affected by scintillation are used. This work shows that scintillations induce a considerable clustering effect on the smoothed positioning solutions; therefore, a methodology to automatically and autonomously detect the boundaries of the scintillation event is suggested according to such an high‐level effect. The use of software‐defined radio receivers for automatically capturing and processing GNSS data affected by scintillation is an added value to the analysis, as it offers the possibility to implement advanced signal processing techniques and a deeper observation of the impact of scintillations on the signals.

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“…One of the parameters which affect the fidelity of the recorded signal to the physical one is the quantization level. One or two bits are enough for the computation of scintillation indexes using a-software receiver (Cristodaro et al 2018). However, a strong reduction of the number of quantization bits reduces the fidelity of the re-played test case to the original one.…”

Section: Rf Re-playmentioning

confidence: 99%

Software-defined radio technology for GNSS scintillation analysis: bring Antarctica to the lab

2018

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Global navigation satellite systems (GNSSs) are widely used to support logistics, scientific operations, and to monitor the polar ionosphere indirectly, which is a region characterized by strong phase scintillation events that severely affect the quality and reliability of received signals. Professional commercial GNSS receivers are widely used for scintillation monitoring; on the contrary, custom-designed solutions based on data grabbers and software receivers constitute novelty. The latter enables a higher level of flexibility and configurability, which is important when working in remote and severe environments. We describe the scientific, technological, and logistical challenges of installing an ionospheric monitoring station in Antarctica, based on a multi-constellation and multi-frequency GNSS data grabber and a software-defined radio receiver. Having access to the full receiver chain and to intermediate signal processing stages allows a deep analysis of the impact of scintillation and, in turn, a better understanding of the physical phenomenon. The possibility to process high-resolution raw intermediate frequency samples of the signal enables not only the computation of scintillation indexes with the same quality as professional devices but also the design and test of innovative receiver architectures and algorithms. Furthermore, the record and replay approach offers the possibility to process in the lab the signals captured on site, with high fidelity level. It is like being in Antarctica again, but with an unlimited set of receivers and higher computational, storage, and bandwidth resources. The main advantages and disadvantages of this approach are analyzed. Examples of monitoring results are reported, confirming the monitoring capabilities, showing the good agreement with commercial receiver outputs and confirming the validity of post-processing and replay operations.

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Design of a Configurable Monitoring Station for Scintillations by Means of a GNSS Software Radio Receiver

Cited by 26 publications

References 20 publications

Semi-Supervised GNSS Scintillations Detection Based on DeepInfomax

Semi-Supervised GNSS Scintillations Detection Based on DeepInfomax

Effects of Phase Scintillation on the GNSS Positioning Error During the September 2017 Storm at Svalbard

Software-defined radio technology for GNSS scintillation analysis: bring Antarctica to the lab

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