Assessment of Dual-frequency Signal Quality Monitor to Support CAT II/III GBAS

Song, Junesol; Milner, Carl; Selmi, Ikhlas; Bouterfas, Sara; Julien, Olivier

doi:10.33012/2019.16864

Cited by 5 publications

(5 citation statements)

References 2 publications

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“…Furthermore, as described in [9] there are several different penalty functions, such as the death penalties, the static penalties, dynamic penalties, or adaptive penalties, that can be used. The death penalties are the simplest functions possible as they reject any unfeasible solutions by penalizing them with infinity.…”

Section: Optimization-based Data Collect Planning Penalty Methods Ove...mentioning

confidence: 99%

“…In order to protect a Civil Aviation user from a Hazardous Misleading Information (HMI) created by a non -nominal GNSS signal distortion [1], specific monitors, called Signal Quality Monitors, are implemented in SBAS (Satellite Based Augmentation System) [4], [6] and GBAS (Ground Based Augmentation System) [8], [9] systems. These monitors are based on the combining of different correlator outputs computed by the fixed SBAS/GBAS reference station receiver in order to detect the presence of signal distortions on the correlation function.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Real Multi-Correlator Outputs for SQM Performance Evaluation

Thevenon¹,

Selmi²,

Haouari³

et al. 2022

The International Technical Meeting of the the Institute of Navigation

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Dr Ikhlas Selmi is currently part of the SIGnal processing and NAVigation (SIGNAV) research axis of TELECOM team at ENAC. She graduated as engineer in Telecommunication and Signal Processing from ESIEE. She received her Ph.D. in 2013 from Telecom SudParis on mitigating GNSS interference between indoor and outdoor signals. She is currently working on GNSS signal distortion generated by the satellite payload. Jihanne El Haouari, Nina Marino and Elodie Rames are ENAC students majoring in space and aeronautical telecommunication systems. They are expected to graduate in 2022.Pr Daniel Delahaye is the head of the Optimization and Machine Learning Team of the ENAC research laboratory and he also in charge of the research chair "AI for ATM and Large-Scale Urban Mobility" in the new AI institute ANITI in Toulouse. He obtained his engineer degree from ENAC and did a Master of Science in signal processing from the national polytechnic institute of Toulouse in 1991. His obtained his PhD in automatic control from the aeronautics and space national school in 1995 under the co -supervision of Marc Schoenauer (CMAPX) and did a post-doc at the Department of Aeronautics and Astronautics at MIT in 1996 under the supervision of Pr Amedeo Odoni. He started his career working at the French Civil Aviation Study Center (CENA) and move to ENAC in 2008. He got his tenure in applied mathematics in 2012. He conducts research on mathematical optimization and artificial intelligence for airspace design and aircraft trajectories optimization. He actively collaborates with MIT, Georgia Tech and NASA (USA) on development of Artificial Intelligence algorithms for air traffic management applications.Dr Christophe Macabiau graduated as electronics engineer in 1992 from ENAC in Toulouse, France. Since 1994, he has been working on the application of satellite navigation techniques to civil aviation. He received his Ph.D in 1997 and has been in charge of the signal processing lab of ENAC from 2000 to 2012. He is currently the head of the TELECOM team of ENAC.Mikael Mabilleau is a standardisation engineer on SBAS in the EGNOS exploitation team of the European GNSS Agency (GSA). Since his graduation as engineer from the French civil aviation school (ENAC) in 2006, he has been involved in GNSS standardization activity carried by the main civil aviation standardisation bodies such as the EUROCAE WG 62 on Galileo, RTCA Special Committee 159 on GPS and the ICAO Navigation System Panel in charge of ICAO standard. Mikael is involved in the evolution of GNSS concepts (ARAIM and SBAS L1L5) supporting the development of the associated standards (SARPs and MOPS) for use in aviation.

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Section: Optimization-based Data Collect Planning Penalty Methods Ove...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of Real Multi-Correlator Outputs for SQM Performance Evaluation

Thevenon¹,

Selmi²,

Haouari³

et al. 2022

The International Technical Meeting of the the Institute of Navigation

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“…Since Galileo E1c signal has the same chipping rate as that of GPS L1 C/A signal, the Honeywell monitor can be used without any modification even if the different modulations are used: Binary Phase Shift Keying (BPSK) for GPS L1 C/A and Composite Binary Offset Carrier (CBOC). However, GPS L5 and Galileo E5a signals, which are modulated as BPSK (10), have a 10 times larger chipping rate, therefore, the code offset ranges for taking correlator outputs and its interval are increased to the factor ten of the values used for GPS L1 C/A and Galileo E1c signals. That is, the Honeywell monitor uses the correlator outputs at locations ranged from -0.5 to 1.25 chips in this study.…”

Section: Monitors For Signal Deformation Faultsmentioning

confidence: 99%

“…The TM parameters used in this study is shown in Table 3 and Table 4. The threat models stemmed from [10] for these modernized signals are currently being discussed for standardization. Here, we use x min :Δx: In the second step, the correlation function is computed using the generated code sequence.…”

Section: Fig 8-diagram Of the Fault Generation Processmentioning

confidence: 99%

“…Three types of monitors are used to detect signal deformations in this study: the first is the signal deformation monitor developed by Honeywell in 2006 [8], the second is a variation of the Code-Carrier Divergence (CCD) monitor developed by Ecole Nationale de l'Aviation Civile (ENAC) [9] and the third is a novel Divergence-Free (DF) innovation monitor. This novel DF-Innovation monitor, which was originally introduced in an earlier version of this paper [10], compares a dummy DF pseudorange to the predicted DF pseudorange at the current epoch, which is propagated from the previous epoch using the innovation of the carrier phase. Accordingly, the novel monitor is sensitive to capturing step faults in the pseudorange measurements, yet is not impacted by ionospheric delay which reduces the efficiency of existing step detectors.…”

Section: Introductionmentioning

confidence: 99%

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Signal deformation fault monitors for dual‐frequency GBAS

2020

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This paper proposes a new dual-frequency signal deformation fault monitor which can effectively reduce the time delay at the Ground-Based Augmentation System (GBAS) airborne user from the airborne filter initialization to the time when it incorporates ground corrections and user measurements for navigation, assuring the system integrity at the same time. The new monitor is applied together with the existing Honeywell signal deformation monitor and Code-Carrier Divergence monitors to protect the airborne users against the signal deformation faults. In addition, the probability of missed detection of the monitors are assessed for the GBAS Approach Service Types (GAST) F, which supports the Category (CAT) II and III precision approaches based on the multi-frequency and multi-constellation. As a result, the proposed monitor together with the Honeywell and the CCD monitors is able to assure the system integrity for all fault cases within the threat space. The result also shows that the addition of the proposed monitor can reduce the time delay by 80% and moreover, it can even reduce the recommended time delay below 50 second. Consequently, it can avoid the unnecessary delays for the use of newly available satellites at the airborne.

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