Demonstration of Meta-signal Positioning using LAMBDA Ambiguity Fixing Method within a Bit-true Simulation

Hameed, Muhammad S.; Woerz, T.; Pany, Thomas; Wendel, Jan; Paonni, Matteo; Senni, Tommaso

doi:10.33012/2021.18011

Cited by 7 publications

(3 citation statements)

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“…A single signal composed by synchronous GNSS channels received at different frequencies has been regarded as meta-signal [30], [31], [32], [33]. In recent years, the use of meta-signals processed as a single wideband signal has been investigated as a promising approach to effectively take advantage of multiple channels availability and extract high-quality measurements to improve positioning accuracy [34], [35], [33], [32], [36], [37].…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

Flexible Metasignal Tracking: Architecture Robustness in Challenging PNT Scenarios

Nardin,

Dovis,

Zanier

et al. 2024

IEEE Trans. Aerosp. Electron. Syst.

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show abstract

“…In addition to the techniques already noted, additional solutions for solving the ambiguity problem have been investigated, for example, considering a vector receiver architecture (García-Molina, 2021;García-Molina & Fernández-Rubio, 2019) in which the code ambiguities of all signals in view are solved simultaneously in a vector solution. In Hameed et al (2021), the ambiguity problem is solved using a modified least-squares ambiguity decorrelation (LAMBDA) method.…”

Section: Introductionmentioning

confidence: 99%

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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“…The first operates at the signal-processing and correlation level, whereas the second exploits and combines the side-band measurements. Signal-processing algorithms include the adoption of triple-loop receiver architectures [ 3 , 4 , 5 , 15 , 16 ], the use of the Least-squares AMBiguity Decorrelation Adjustment (LAMBDA) method [ 18 ], and collective unambiguous positioning approaches [ 12 ]. Triple-loop architectures are a direct extension of algorithms originally designed for the processing of Binary Offset Carrier (BOC) signals [ 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Synthetic Meta-Signal Observations: The Beidou Case

Borio,

Gioia

2023

Sensors

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A Global Navigation Satellite System (GNSS) meta-signal is obtained when two or more side-band components from different frequencies are jointly processed as a single entity. This requires advanced signal processing techniques able to cope with the subcarrier, generated by the interaction of the side-band components, and handle possibly multi-peaked ambiguous correlation functions. An alternative approach to meta-signal processing is to reconstruct meta-signal observations using side-band measurements. Meta-signal high-accuracy pseudoranges can be reconstructed from the side-band code and carrier observations. The success of the reconstruction depends on several factors, including the frequency separation of the side-band components and the presence of measurement biases. The Beidou Navigation Satellite System (BDS), with its second- and third-generation signals, provides a wide range of components with various frequency separations. In this paper, we experimentally investigate the performance and limitations of the measurement reconstruction approach using Beidou observations. When the B1I and B1C components are considered, their reduced frequency separation leads to unambiguous measurements fully exploiting the potential of meta-signals. For larger frequency separations, jumps and discontinuities are observed in the position domain, which is a major limiting factor of this type of approach.

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Demonstration of Meta-signal Positioning using LAMBDA Ambiguity Fixing Method within a Bit-true Simulation

Cited by 7 publications

References 0 publications

Flexible Metasignal Tracking: Architecture Robustness in Challenging PNT Scenarios

Flexible Metasignal Tracking: Architecture Robustness in Challenging PNT Scenarios

Reconstructing GNSS Meta-Signal Observations Using Sideband Measurements

Synthetic Meta-Signal Observations: The Beidou Case

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