Multicorrelator signal tracking and signal quality monitoring for GNSS with extended Kalman filter

Iliopoulos, Andreas; Enneking, Christoph; Crespillo, Omar García; Jost, Thomas; Thoelert, Steffen; Antreich, Felix

doi:10.1109/aero.2017.7943579

Cited by 6 publications

(9 citation statements)

References 13 publications

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“…Figure 3 illustrates the adaptations that need to be carried out in order to implement the proposed algorithm in the place of a "traditional" DLL. The proposed algorithm requires a bank with P correlators according to Equation (22), whose number depends on the front-end bandwidth. This requires more computational resources than the regular three "early-prompt-late" correlators in a DLL but it is comparable for small front-end bandwidths the computational effort required for other discriminators such as the double delta discriminators.…”

Section: Algorithm Discussion -Implementation Analysismentioning

confidence: 99%

“…These works include estimation or tracking of multiple signal arrivals, optimality criteria being ML [18], Bayesian mean squared error [19] or mixtures of the two [20,21]. In [22], we presented a novel algorithm based on the EKF, which substitutes traditional DLLs and is able to robustly track the satellite signal code delay and simultaneously estimate the GNSS signal channel, with the help of a multicorrelator bank structure. In this paper, we optimize the aforementioned algorithm and further develop it to also handle and estimate complex amplitudes of the signals contained in the channel seen by a GNSS receiver.…”

Section: State Of the Artmentioning

confidence: 99%

See 1 more Smart Citation

Robust Ranging in the Presence of Repeater Signals

Iliopoulos¹,

Enneking²,

Jost³

et al. 2017

Proceedings of the 30th International Technical Meeting of the Satellite Division of the Institute of Navigation (ION GNSS+ 201

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Section: Algorithm Discussion -Implementation Analysismentioning

confidence: 99%

Section: State Of the Artmentioning

confidence: 99%

Robust Ranging in the Presence of Repeater Signals

Iliopoulos¹,

Enneking²,

Jost³

et al. 2017

Proceedings of the 30th International Technical Meeting of the Satellite Division of the Institute of Navigation (ION GNSS+ 201

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“…Therefore, removing the mean value from CMC Dfree for a single satellite computed over a window of time K in which the signal was tracked continuously would remove all the integer ambiguity dependencies from the signal. In this way, a code multipath estimation for a certain epoch k ( MP k ) can be expressed as in (5). From now on, we express all the formulas for a single satellite s and frequency i = L1 and therefore we omit the subsequent indices in the notation.…”

Section: Estimation Of Multipath and Noisementioning

confidence: 99%

Detection of GNSS Multipath with Time-Differenced Code-Minus-Carrier for Land-Based Applications

Caamano

Crespillo

Gerbeth

et al. 2020

2020 European Navigation Conference (ENC)

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Ground transportation systems demand accurate and robust localization functions. Satellite navigation is considered a key element in those systems, but its position determination can be highly corrupted in urban environments because of the presence of reflected signals (i.e. multipath). This paper deals with the detection of multipath in the code measurements of GNSS receivers for mobile users in urban scenarios. First, we discuss the different alternatives and limitations to properly isolate multipath autonomously at the receiver based on Code-Minus-Carrier (CMC) techniques in challenging GNSS applications. We then propose a practical methodology to design a suitable multipath detector based on the time difference of CMC. All the analysis and evaluations are supported with real measurements collected in Railway scenarios.

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“…Since the code correlator spacings and RF front-end may vary between user and reference receivers, differential corrections cannot remove the range errors induced by this failure type. The signals suffering from this failure should be promptly detected and excluded from positioning [24]. Fig.…”

Section: B Tracking Errors Analysismentioning

confidence: 99%

Detection and Classification of GNSS Signal Distortions Based on Quadratic Discriminant Analysis

et al. 2020

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Satellite signal distortions, or so called ''evil waveforms'' (EWFs), may cause severe distortions of the cross-correlation function in receivers. Undetected EWFs could result in large range errors and threaten the integrity of Global Navigation Satellite System (GNSS). Analog distortion and digital distortion are two classical types of signal distortions. With the advent of modernized GNSS signals, more failure types are considered to cover potential EWFs of Binary offset carrier (BOC) modulated signals, such as codeonly distortion and subcarrier-only distortion. Different failure types affect the correlation functions and the tracking precision in different ways. Therefore, it is useful to identify the failure type of a detected distortion. Conventional multi-correlator method can detect signal distortions; however, it is infeasible to identify the failure types. We developed a novel multi-correlator method based on Quadratic Discriminant Analysis (QDA). The QDA-based method also uses correlation-domain detection metrics but performs distortion type classification by supervised learning algorithm. Experimentally measured results on Beidou B1C data signals are presented, which show the effectiveness and robustness of proposed method. Compared with conventional multi-correlator method, the QDA-based signal quality monitoring (SQM) method shows better performance on detecting EWFs and provides an extra capability to identify the failure types accurately. INDEX TERMS Evil waveforms (EWFs), quadratic discriminant analysis (QDA), signal quality monitoring (SQM), multi-correlator method.

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Multicorrelator signal tracking and signal quality monitoring for GNSS with extended Kalman filter

Cited by 6 publications

References 13 publications

Robust Ranging in the Presence of Repeater Signals

Robust Ranging in the Presence of Repeater Signals

Detection of GNSS Multipath with Time-Differenced Code-Minus-Carrier for Land-Based Applications

Detection and Classification of GNSS Signal Distortions Based on Quadratic Discriminant Analysis

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