High Sensitivity Techniques for GNSS Signal Acquisition

Dovis, Fabio; Ta, Tung Hai

doi:10.5772/29453

Cited by 11 publications

(4 citation statements)

References 18 publications

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“…All these approaches are considered by the methods tested in this study. In order to analyze and compare the performances of different acquisition techniques, as explained in [6], we compare different metrics: the probabilities of detection/false alarm, the peak-to-noise floor ratios for the acquired signals, and the execution time of the signal acquisition. Preliminary results on the acquisition in case of strong scintillations were presented in a recent paper [7].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Performance Analysis of GPS L1 C/A, L5 Acquisition and Tracking Stages Under Polar and Equatorial Scintillations

Savas

Falco

Dovis

2021

IEEE Trans. Aerosp. Electron. Syst.

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This paper provides a comparative performance analysis of different acquisition and tracking methods of GPS L1 C/A and GPS L5 signals testing their robustness to the presence of scintillations in the propagation environment. The paper compares the different acquisition methods in terms of probabilities of detection/false alarm, peak-to-noise floor ratios for the acquired signal and execution time, assessing the performance loss in the presence of scintillations. Moreover, robust tracking architectures that are optimized to operate in a harsh ionospheric environment have been employed. The performance of the carrier tracking methods, namely, traditional Phase-Locked Loop (PLL) and Kalman filter based-PLL, have been compared in terms of the standard deviation of Doppler estimation, phase error, phase lock indicator (PLI) and phase jitter. The study is based on real GNSS signals affected by significant phase and amplitude scintillation effects, collected at the South African Antarctic research base (SANAE IV) and Brazilian Centro de Radioastronomia e Astrofisica Mackenzie (CRAAM) monitoring stations. Performance is assessed exploiting a fully software GNSS receiver which implements the different architectures. The comparative analysis allows to choose the best setting of the acquisition and tracking parameters, in order to allow the operation of signal acquisition and tracking at a required performance level under scintillation conditions. Index Terms-Acquisition, carrier phase tracking, ionospheric scintillation, Kalman filter based tracking.

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Section: Introductionmentioning

confidence: 99%

A Comparative Performance Analysis of GPS L1 C/A, L5 Acquisition and Tracking Stages Under Polar and Equatorial Scintillations

Savas

Falco

Dovis

2021

IEEE Trans. Aerosp. Electron. Syst.

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“…Coherent combining across signal components and coherent integration over time are techniques of high-sensitivity GNSS receivers (Dovis & Ta, 2012;Kong, 2017;Seco-Granados et al, 2012) used to achieve better signal detection, tracking, and measurement. Coherent combining of multiple signals may involve the upper and lower sidebands of a BOC signal (Yang et al, 2020a) and signals on different bands (Deambrogio et al, 2013;Yang & Soloviev, 2016).…”

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confidence: 99%

“…Non-coherent integration including the semi, differential, and generalized coherent variants (Dovis & Ta, 2012;Esteves et al, 2016;Gómez-Casco et al, 2020;Kong, 2017) applies a nonlinear operation (delay-conjugate-multiply) so as to remove data bits and residual Doppler shift. As such, it suffers from an instantaneous signal-to-noise ratio (SNR) degradation due to the squaring loss (Lowe, 1999;Strassle et al, 2007) as the price paid for the benefit of subsequent longer power accumulation.…”

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Coherent Combining and Long Coherent Integration for BOC Signal Acquisition under Strong Interference

Yuan¹,

Soloviev²,

Vadlamani³

et al. 2022

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Binary offset carrier (BOC) modulation was initially developed for GPS modernization, leading to the new military M-code BOC(10,5) at L1 and L2 (Barker et al., 2000;Betz, 1999). It was quickly adopted by other GNSS constellations and is now used in L1C D BOC(1,1), L1C P TMBOC(6,1,1/11), E1 A BOC(15,2.5), E1 B /E1 C CBOC(6,1,1/11), E6 A BOC(10,5), E5 AltBOC(15,10), and B1A BOC(14,2), B1C D BOC(1,1), B1C P QMBOC(6,1,4/33), B2a and B2b AltBOC(15,10), and B3A BOC(15,2.5), among others. The split-spectrum offered by BOC modulation was originally sought for its easy sharing of the crowded spectrum with the legacy binary phase shift keying (BPSK) signals that occupy the respective band centers. It turns out that the split-spectrum possesses a larger Gabor bandwidth, producing better ranging performance in terms of accuracy and multipath (Betz, 2015;Pany, 2010).The acquisition and tracking of a general BOC signal encounter the issue of multiple peak ambiguity (Gusi et al., 2016) even though it is less of a problem for multiplexed BOC (MBOC) signals due to low subcarrier rate (Pany, 2020). Many

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“…PDI techniques overcome the limitations of the coherent integration time duration by using a non-linear function. Although these techniques are less effective in accumulating signal energy than the coherent integration, they can use a longer integration time allowing the receiver to acquire satellites with lower carrier-to-noise ratio [2], [3].…”

mentioning

confidence: 99%

Optimal Post-Detection Integration Techniques for the Reacquisition of Weak GNSS Signals

Gomez-Casco

López-Salcedo

Seco‐Granados

2020

IEEE Trans. Aerosp. Electron. Syst.

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This paper tackles the problem of finding the optimal non-coherent detector for the reacquisition of weak Global Navigation Satellite System (GNSS) signals in the presence of bits and phase uncertainty.Two solutions are derived based on using two detection frameworks: the Bayesian approach and the generalized likelihood ratio test (GLRT). We also derive approximate detectors of reduced computation complexity and without noticeable performance degradation. Simulation results reveal a clear improvement of the detection probability for the proposed techniques with respect to the conventional detectors implemented in high sensitivity GNSS (HS-GNSS) receivers to acquire weak GNSS signals. Finally, we draw conclusions on which is the best technique to reacquire weak GNSS signals in practice considering a trade-off between performance and complexity.

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High Sensitivity Techniques for GNSS Signal Acquisition

Cited by 11 publications

References 18 publications

A Comparative Performance Analysis of GPS L1 C/A, L5 Acquisition and Tracking Stages Under Polar and Equatorial Scintillations

A Comparative Performance Analysis of GPS L1 C/A, L5 Acquisition and Tracking Stages Under Polar and Equatorial Scintillations

Coherent Combining and Long Coherent Integration for BOC Signal Acquisition under Strong Interference

Optimal Post-Detection Integration Techniques for the Reacquisition of Weak GNSS Signals

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