Impact of non-idealities on GNSS meta-signals processing

Nardin, Andrea; Dovis, Fabio; Motella, Beatrice

doi:10.23919/enc48637.2020.9317365

Cited by 9 publications

(13 citation statements)

References 5 publications

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“…DPE can also be implemented as a form of coherent sideband processing (Borio, 2017;Feng et al, 2016). This last approach should be adopted for meta-signals because each sideband component is characterized by its own spreading code and, thus, correlation has to be performed separately on the two sideband signals (Nardin et al, 2020;Paonni et al, 2014).…”

Section: Gnss Meta-signals and Dpementioning

confidence: 99%

“…While the potential of meta-signal processing has been demonstrated, for example, through the analysis of the Cramer-Rao lower bound (CRLB; Das et al, 2020;Ortega et al, 2020), meta-signals have a multi-peaked correlation function and a tracking loop can lock on a secondary peak, leading to biased measurements (Nardin et al, 2020;Schwalm et al, 2020). The number of secondary correlation peaks increases with the frequency separation of the sideband components and false locks can significantly degrade meta-signal processing performance (Schwalm et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…The number of secondary correlation peaks increases with the frequency separation of the sideband components and false locks can significantly degrade meta-signal processing performance (Schwalm et al, 2020). Moreover, filtering and other non-idealities can worsen the ambiguity problem that should be addressed with dedicated algorithms (Nardin et al, 2020). In this respect, tracking a meta-signal is a problem similar to that of BOC/Alt-BOC processing.…”

Section: Introductionmentioning

confidence: 99%

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Reconstructing GNSS Meta-Signal Observations Using Sideband Measurements

Borio

Gioia

2023

navi

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Global navigation satellite systems (GNSSs) provide several signals on different frequencies: Two or more components can be processed jointly as a meta-signal. Despite significant effort devoted to developing effective techniques for meta-signal processing, limited research has been conducted to characterize meta-signal measurements. In this work, the observations obtained by processing a GNSS meta-signal are characterized and fundamental relationships between GNSS meta-signal and dual-frequency measurement combinations are derived.We show that subcarrier phase observations can be estimated as the wide-lane linear combination of the carrier phases obtained from the two original sideband components. Moreover, meta-signal code measurements can be reconstructed from the pseudoranges and carrier phases of the original components. Thus, meta-signal pseudoranges are mixed code and carrier observations. The experimental results confirm the validity of the theoretical formulas that can be used to reconstruct meta-signal measurements from dual-frequency observations.

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Section: Gnss Meta-signals and Dpementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reconstructing GNSS Meta-Signal Observations Using Sideband Measurements

Borio

Gioia

2023

navi

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“…Indeed, f s can be arbitrarily chosen as long as the Nyquist limit is observed and possible additional constraints imposed by the hardware are respected. Similarly, the central frequency shift f c with respect to which each f i is defined can be freely set and the signal components can be generated through equation ( 13) by updating f i and f RF in accordance with equations ( 6) and (7). Given a set of signals, we can find the optimal baseband configuration that maximises the multiplexing efficiency.…”

Section: Input Optimisation For Multiplexingmentioning

confidence: 99%

“…Multilevel spreading chips have been proposed to achieve better ranging accuracy [5]. On the other hand, the growing number of services have also been allocated to adjacent carriers, [1] and the combination of these signals into a single composite multicarrier signal has become attractive to limit the number of amplifier chains [6] and to foster innovative receiver processing strategies [7,8]. Nonetheless, the emerging low earth orbit PNT paradigm [8][9][10] is encouraging a flexible PNT signals generation on payloads designed for rapid reconfiguration [9].…”

Section: Introductionmentioning

confidence: 99%

Optimised design of next‐generation multiplexing schemes for Global Navigation Satellite Systems

Nardin

Dovis

Perugia

et al. 2023

IET Radar Sonar & Navi

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Multilevel and multicarrier component signals are now common in many Global Navigation Satellite Systems challenging the employed multiplexing method that needs to be more flexible and powerful. In this work, the authors demonstrate how, by acting on two parameters of the digital baseband representation of component signals (the sampling frequency and the central frequency of the baseband complex envelope), it is possible to optimise the performance of the multiplexer, while still obtaining a composite signal that fulfils the required system constraints.

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Flexible Metasignal Tracking: Architecture Robustness in Challenging PNT Scenarios

Nardin,

Dovis,

Zanier

et al. 2024

IEEE Trans. Aerosp. Electron. Syst.

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The idea of multichannel tracking is generally found in the Global Navigation Satellite System (GNSS) literature with a wideband approach. We further developed the concept to separately process two narrowband channels that are later combined in a dedicated delay-locked loop (DLL) in a virtual wideband fashion. To suit prospect evolution of positioning, navigation, and timing (PNT) technologies and GNSSs, we generalized the so-called meta-signal construction to the combination of components transmitted over the same bandwidth, thus expanding the range of candidate multichannel components and fostering efficient bandwidth exploitation and increased resiliency to harsh Doppler. These improvements are sustained by additional complexity at the receiver, whose robustness must be carefully assessed. The resulting architecture performance in presence of multipath and tracking noise is therefore characterized under the challenging conditions of modern GNSSs, focusing on a low earth orbit (LEO) PNT scenario. The technique can successfully bear the representative Doppler profiles and C/N 0 levels of the addressed scenarios achieving a large estimation noise reduction, even under challenging multipath conditions.

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Impact of non-idealities on GNSS meta-signals processing

Cited by 9 publications

References 5 publications

Reconstructing GNSS Meta-Signal Observations Using Sideband Measurements

Reconstructing GNSS Meta-Signal Observations Using Sideband Measurements

Optimised design of next‐generation multiplexing schemes for Global Navigation Satellite Systems

Flexible Metasignal Tracking: Architecture Robustness in Challenging PNT Scenarios

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