LO

Lorenzo Ortega

58
Documents
Affiliations actuelles
  • Institut Polytechnique des Sciences Avancées (IPSA)
  • Laboratoire de recherche coopératif dans les télécommunications spatiales et aéronautiques (TESA)
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Publications

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Robust semiparametric efficient estimator for time delay and Doppler estimation

Lorenzo Ortega , Stefano Fortunati

IEEE Signal Processing Letters, 2025, ⟨10.1109/LSP.2025.3560533⟩

Article dans une revue hal-04805170v2
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On the efficiency of misspecified Gaussian inference in nonlinear regression: application to time-delay and Doppler estimation

Stefano Fortunati , Lorenzo Ortega

Signal Processing, 2024, ⟨10.1016/j.sigpro.2024.109614⟩

Article dans une revue hal-04349291v1
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Bayesian EM Approach for GNSS Parameters of Interest Estimation Under Constant Modulus Interference

Julien Lesouple , Lorenzo Ortega

EURASIP Journal on Advances in Signal Processing, In press, 2024 (1), pp.32. ⟨10.1186/s13634-024-01129-z⟩

Article dans une revue hal-04485071v2
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Emerging trends in signal processing and machine learning for positioning, navigation and timing information: special issue editorial

Pau Closas , Lorenzo Ortega , Julien Lesouple , Petar M. Djuric

EURASIP Journal on Advances in Signal Processing, 2024, 2024 (1), pp.84. ⟨10.1186/s13634-024-01182-8⟩

Article dans une revue hal-04695683v1
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Approximate maximum likelihood time-delay estimation for two closely spaced sources

Corentin Lubeigt , François Vincent , Lorenzo Ortega , Jordi Vilà-Valls , Eric Chaumette

Signal Processing, 2023, 210, pp.109056. ⟨10.1016/j.sigpro.2023.109056⟩

Article dans une revue hal-04541122v1

On GNSS Synchronization Performance Degradation under Interference Scenarios: Bias and Misspecified Cramér-Rao Bounds

Lorenzo Ortega , Corentin Lubeigt , Jordi Vilà-Valls, , Eric Chaumette

Navigation, 2023, 70 (4), pp.navi.606. ⟨10.33012/navi.606⟩

Article dans une revue hal-04541095v1
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GNSS Channel Coding Structures for Fast Acquisition Signals in Harsh Environment Conditions

Lorenzo Ortega , Charly Poulliat

Navigation, 2023, 70 (3), pp.navi.585. ⟨10.33012/navi.585⟩

Article dans une revue hal-04003710v1
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Band-limited impulse response estimation performance

Corentin Lubeigt , Lorenzo Ortega , Jordi Vilà-Valls , Eric Chaumette

Signal Processing, 2023, 208, pp.108998. ⟨10.1016/j.sigpro.2023.108998⟩

Article dans une revue hal-04541129v1

Insights on the Estimation Performance of GNSS-R Coherent and Noncoherent Processing Schemes

Lorenzo Ortega , Jordi Vila-Valls , Eric Chaumette

IEEE Geoscience and Remote Sensing Letters, 2022, 19, pp.1-5. ⟨10.1109/LGRS.2021.3079579⟩

Article dans une revue hal-04541183v1

Clean-to-Composite Bound Ratio: A Multipath Criterion for GNSS Signal Design and Analysis

Corentin Lubeigt , Lorenzo Ortega , Jordi Vila-Valls , Laurent Lestarquit , Eric Chaumette

IEEE Transactions on Aerospace and Electronic Systems, 2022, pp.1-1. ⟨10.1109/TAES.2022.3172023⟩

Article dans une revue hal-03774103v1

Non-Binary PRN-Chirp Modulation: A GNSS Fast Acquisition Signal Waveform

Lorenzo Ortega , Jordi Vila-Valls , Eric Chaumette

IEEE Communications Letters, 2022, pp.1-1. ⟨10.1109/LCOMM.2022.3185319⟩

Article dans une revue hal-03774100v1

Untangling First and Second Order Statistics Contributions in Multipath Scenarios

Corentin Lubeigt , Lorenzo Ortega , Jordi Vilà-Valls , Eric Chaumette

Signal Processing, 2022, pp.108868. ⟨10.1016/j.sigpro.2022.108868⟩

Article dans une revue hal-03878879v1

Accounting for Acceleration – Signal Parameters Estimation Performance Limits in High Dynamics Applications

Hamish Mcphee , Lorenzo Ortega , Jordi Vila-Valls , Eric Chaumette

IEEE Transactions on Aerospace and Electronic Systems, 2022, pp.1-13. ⟨10.1109/TAES.2022.3189611⟩

Article dans une revue hal-03769981v1

On the Accuracy Limits of Misspecified Delay-Doppler Estimation

Hamish Mcphee , Lorenzo Ortega , Jordi Vilà-Valls , Eric Chaumette

Signal Processing, 2022, pp.108872. ⟨10.1016/j.sigpro.2022.108872⟩

Article dans une revue hal-03878878v1

On the Impact and Mitigation of Signal Crosstalk in Ground-Based and Low Altitude Airborne GNSS-R

Corentin Lubeigt , Lorenzo Ortega , Jordi Vilà-Valls , Laurent Lestarquit , Eric Chaumette

Remote Sensing, 2021, 13 (6), pp.1085. ⟨10.3390/rs13061085⟩

Article dans une revue hal-04541237v1
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Low Complexity Robust Data Demodulation for GNSS

Lorenzo Ortega , Charly Poulliat , Marie-Laure Boucheret , Marion Aubault Roudier , Hanaa Al-Bitar et al.

Sensors, 2021, 21 (4), pp.1341. ⟨10.3390/s21041341⟩

Article dans une revue hal-03341451v1

GNSS data demodulation over fading environments: Antipodal and M ‐ary CSK modulations

Lorenzo Ortega Espluga , Jordi Vilà‐valls , Charly Poulliat , Pau Closas

IET Radar Sonar and Navigation, 2021, 15 (2), pp.113-127. ⟨10.1049/rsn2.12017⟩

Article dans une revue hal-03245922v1

On Nested Property of Root-LDPC Codes

Lorenzo Ortega Espluga , Charly Poulliat

IEEE Wireless Communications Letters, 2021, 10 (5), pp.1005-1009. ⟨10.1109/LWC.2021.3054414⟩

Article dans une revue hal-03245925v1
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Optimizing the Co-Design of Message Structure and Channel Coding to Reduce the TTD for a Galileo 2nd Generation Signal

Lorenzo Ortega , Charly Poulliat , Marie-Laure Boucheret , Marion Aubault-Roudier , Hanaa Al Bitar-El Natour

Navigation, 2020, 67 (3), pp.471-492. ⟨10.1002/navi.382⟩

Article dans une revue hal-02941370v1

New multiplexing method to add a new signal in the Galileo E1 band

Lorenzo Ortega Espluga , Charly Poulliat , Marie-Laure Boucheret , Marion Aubault‐roudier , Hanaa Al‐bitar

IET Radar Sonar and Navigation, 2020, 14 (11), pp.1735-1746. ⟨10.1049/iet-rsn.2020.0197⟩

Article dans une revue hal-03245938v1
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LLR Approximation for Fading Channels Using a Bayesian Approach

Lorenzo Ortega Espluga , Marion Aubault-Roudier , Charly Poulliat , Marie-Laure Boucheret , Hanaa Al-Bitar et al.

IEEE Communications Letters, 2020, 24 (6), pp.1244-1248. ⟨10.1109/LCOMM.2020.2978832⟩

Article dans une revue hal-03246009v1
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Joint Delay-Doppler Estimation Performance in a Dual Source Context

Corentin Lubeigt , Lorenzo Ortega , Jordi Vilà-Valls , Laurent Lestarquit , Eric Chaumette

Remote Sensing, 2020, 12 (23), pp.3894. ⟨10.3390/rs12233894⟩

Article dans une revue hal-03108747v1
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Performance Limits of GNSS Code-Based Precise Positioning: GPS, Galileo & Meta-Signals

Priyanka Das , Lorenzo Ortega , Jordi Vilà-Valls , François Vincent , Eric Chaumette et al.

Sensors, 2020, 20 (8), pp.2196-2217. ⟨10.3390/s20082196⟩

Article dans une revue hal-02974864v1
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Compact CRB for delay, Doppler, and phase estimation – application to GNSS SPP and RTK performance characterisation

Daniel Medina , Lorenzo Ortega , Jordi Vilà-Valls , Pau Closas , Francois Vincent et al.

IET Radar Sonar and Navigation, 2020, 14 (10), pp.1537-1549. ⟨10.1049/iet-rsn.2020.0168⟩

Article dans une revue hal-02974914v1
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Positioning Performance Limits of GNSS Meta-Signals and HO-BOC Signals

Lorenzo Ortega , Daniel Medina , Jordi Vilà-Valls , François Vincent , Eric Chaumette

Sensors, 2020, 20 (12), pp.3586-3613. ⟨10.3390/s20123586⟩

Article dans une revue hal-02974941v1
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Proposition for the EUSIPCO 2025 Phased Array Signal Processing Student Challenge

Julien Lesouple , Alexandre Brochard , Lorenzo Ortega , Paul Thevenon , Evelyn Lisseth Rojano Fernández

EUSIPCO 2025, Sep 2025, Palermo, Italy

Communication dans un congrès hal-05248681v1
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EM Manifold Estimation of GNSS Synchronization Parameters Under Constant Modulus Interference

Asmae Bendahmane , Alexandre Brochard , Julien Lesouple , Lorenzo Ortega , Jordi Vilà-Valls

EUSIPCO 2025, Sep 2025, Palermo, Italy

Communication dans un congrès hal-05248672v1
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Robust semiparametric time-delay and doppler estimation : analysis of rand M -estimators

Lorenzo Ortega , Stefano Fortunati

The 33rd European Signal Processing Conference (EUSIPCO), Sep 2025, Parlemo, Italy

Communication dans un congrès hal-05266973v1
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Performance Evaluation of GNSS Meta-Signals Under Multipath Environment

Robin Duprat , Emile Ghizzo , Paul Thevenon , Lorenzo Ortega , Sébastien Roche et al.

38th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2025), The Institute of Navigation (ION), Sep 2025, Baltimore, United States. pp.878-898, ⟨10.33012/2025.20404⟩

Communication dans un congrès hal-05293928v1
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On the efficiency of a misspecified contaminated nonlinear regression model : application to time-delay and doppler estimation

Hamish Mcphee , Lorenzo Ortega , Stefano Fortunati , Jean-Yves Tourneret

IEEE International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP 2025), IEEE, Dec 2025, Punta Cana, Dominican Republic

Communication dans un congrès hal-05470350v1

Theoretical Performance Analysis of GNSS Tracking Loops

Samy Labsir , Gaël Pages , Lorenzo Ortega , Jordi Vilà-Valls , Éric Chaumette

2023 IEEE/ION Position, Location and Navigation Symposium (PLANS), Apr 2023, Monterey, France. pp.946-951, ⟨10.1109/PLANS53410.2023.10139980⟩

Communication dans un congrès hal-04541103v1
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An EM Approach for GNSS Parameters of Interest Estimation Under Constant Modulus Interference

Julien Lesouple , Lorenzo Ortega

EUSIPCO 2023, EURASIP, Sep 2023, Helsinki (Aalto University School of Economics), Finland

Communication dans un congrès hal-04144451v1

GNSS L5/E5 Maximum Likelihood Synchronization Performance Degradation under DME Interferences

Lorenzo Ortega , Corentin Lubeigt , Jordi Vilã-Valls , Eric Chaumette

2023 IEEE/ION Position, Location and Navigation Symposium (PLANS), Apr 2023, Monterey, France. pp.553-558, ⟨10.1109/PLANS53410.2023.10140102⟩

Communication dans un congrès hal-04541116v1

Time-Delay and Doppler Estimation with a Carrier Modulated by a Band-Limited Signal

Joan Bernabeu Frias , Lorenzo Ortega , Antoine Blais , Yoan Gregoire , Eric Chaumette

2023 IEEE 9th International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP), Dec 2023, Herradura, France. pp.346-350, ⟨10.1109/CAMSAP58249.2023.10403430⟩

Communication dans un congrès hal-04541082v1
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Close-to-Ground Single Antenna GNSS-R

Corentin Lubeigt , Francois Vincent , Lorenzo Ortega , Jordi Vilà-Valls , Laurent Lestarquit et al.

ESA Workshop on Satellite Navigation Technologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC 2022), Apr 2022, Online Event, Netherlands

Communication dans un congrès hal-03758599v1

Theoretical Evaluation of the GNSS Synchronization Performance Degradation under Interferences

Lorenzo Ortega , Jordi Vilà-Valls , Eric Chaumette

35th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2022), Sep 2022, Denver, France. pp.3758-3767, ⟨10.33012/2022.18564⟩

Communication dans un congrès hal-04541136v1

Multipath Estimating Techniques Performance Analysis

Corentin Lubeigt , Lorenzo Ortega , Jordi Vila-Valls , Laurent Lestarquit , Eric Chaumette

2022 IEEE Aerospace Conference (AERO), Mar 2022, Big Sky, France. pp.1-6, ⟨10.1109/AERO53065.2022.9843802⟩

Communication dans un congrès hal-03774107v1

A Multidimensional Scaling Approach for Cooperative GNSS Navigation

Ali Naouri , Lorenzo Ortega , Jordi Vila-Valls , Eric Chaumette

2021 International Conference on Localization and GNSS (ICL-GNSS), Jun 2021, Tampere, France. pp.1-6, ⟨10.1109/ICL-GNSS51451.2021.9452296⟩

Communication dans un congrès hal-04541162v1

On The Accuracy Limit of Joint Time-Delay/Doppler/Acceleration Estimation with a Band-Limited Signal

Hamish Mcphee , Lorenzo Ortega , Jordi Vila-Valls , Eric Chaumette

ICASSP 2021 - 2021 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Jun 2021, Toronto, France. pp.5130-5134, ⟨10.1109/ICASSP39728.2021.9414270⟩

Communication dans un congrès hal-04541153v1

A Compact CRB for the Single Source Conditional Signal Model with Application to Delay-Doppler-Phase Estimation of Band-Limited Signals

Lorenzo Ortega , Daniel Medina , Jordi Vila-Valls , François Vincent , Eric Chaumette

2020 59th IEEE Conference on Decision and Control (CDC), Dec 2020, Jeju, France. pp.2906-2911, ⟨10.1109/CDC42340.2020.9303748⟩

Communication dans un congrès hal-04541190v1

On the Time-Delay Estimation Accuracy Limit of GNSS Meta-Signals

Lorenzo Ortega , Jordi Vila-Valls , Eric Chaumette , Francois Vincent

2020 IEEE 23rd International Conference on Intelligent Transportation Systems (ITSC), Sep 2020, Rhodes, France. pp.1-6, ⟨10.1109/ITSC45102.2020.9294581⟩

Communication dans un congrès hal-04541200v1

On the Time-Delay Estimation Performance Limit of New GNSS Acquisition Codes

Lorenzo Ortega , Jordi Vila-Valls , Eric Chaumette , Francois Vincent

2020 International Conference on Localization and GNSS (ICL-GNSS), Jun 2020, Tampere, France. pp.1-6, ⟨10.1109/ICL-GNSS49876.2020.9115552⟩

Communication dans un congrès hal-04541215v1

Robust Tracking under Measurement Model Mismatch via Linearly Constrained Extended Kalman Filtering

Lorenzo Ortega , Jordi Vila-Valls , Eric Chaumette , Gael Pages , François Vincent

2020 59th IEEE Conference on Decision and Control (CDC), Dec 2020, Jeju, France. pp.2924-2929, ⟨10.1109/CDC42340.2020.9303842⟩

Communication dans un congrès hal-04541173v1

Optimal Channel Coding Structures for Fast Acquisition Signals in Harsh Environment Conditions

Lorenzo Ortega , Charly Poulliat , Marie-Laure Boucheret , Marion Aubault-Roudier , Hanaa Al Bitar-El Natour

32nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2019), Sep 2019, Miami, Florida, United States. pp.4026-4040, ⟨10.33012/2019.17113⟩

Communication dans un congrès hal-02976621v1

Data Decoding Analysis of Next Generation GNSS Signals

Lorenzo Ortega , Pau Closas , Charly Poulliat , Marie-Laure Boucheret , Marion Aubault-Roudier et al.

32nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2019), Sep 2019, Miami, Florida, United States. pp.1090-1105, ⟨10.33012/2019.17046⟩

Communication dans un congrès hal-02976620v1

Binary Root Protograph LDPC Codes for CSK Modulation toIncrease the Data Rate and Reduce the TTD

Lorenzo Ortega , Charly Poulliat , Marie-Laure Boucheret , Marion Aubault-Roudier , Hanaa Al Bitar-El Natour

32nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2019), Sep 2019, Miami, Florida, United States. pp.1020-1038, ⟨10.33012/2019.17040⟩

Communication dans un congrès hal-02976619v1
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Advanced co-design of message structure and channel coding scheme to reduce the time to CED and to improve the resilience for a Galileo 2nd Generation new signal

Lorenzo Ortega Espluga , Charly Poulliat , Marie-Laure Boucheret , Marion Aubault , Hanaa Al Bitar-El Natour

ESA Workshop on Satellite Navigation Technologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC 2018), Dec 2018, Noordwijk, Netherlands. pp.0

Communication dans un congrès hal-02279418v1
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New Solutions to Reduce the Time-To-CED and to Improve the CED Robustness of the Galileo I/NAV Message

Lorenzo Ortega Espluga , Charly Poulliat , Marie-Laure Boucheret , Marion Aubault , Hanaa Al Bitar-El Natour

IEEE/ION Position, Location and Navigation Symposium (PLANS 2018), Apr 2018, Monterey, California, United States. pp.1-10

Communication dans un congrès hal-02603519v1

Joint Design of GNSS Signal and Message Structure for Galileo 2nd Generation

Lorenzo Ortega Espluga , Charly Poulliat , Marie-Laure Boucheret , Marion Aubault , Hanaa Al Bitar-El Natour

ITSNT 2018, 5th International Technical Symposium on Navigation and Timing, CNES; ENAC, Oct 2018, Toulouse, France. ⟨10.31701/itsnt2018.19⟩

Communication dans un congrès hal-01942282v1
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Co-design of message Structure and Channel Coding Scheme to Reduce the Time to CED and to Improve the Resilience for a Galileo 2nd Generation New Signal

Lorenzo Ortega , Charly Poulliat , Marie-Laure Boucheret , Marion Aubault , Hanaa Al Bitar-El Natour

31st International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2018), Sep 2018, Miami, Florida, United States. pp.4064-4078, ⟨10.33012/2018.15878⟩

Communication dans un congrès hal-02295361v1

New Solutions on the Design of a Galileo Acquisition-Aiding Signal to Improve the TTFF and the Sensitivity

Lorenzo Ortega , Charly Poulliat , Marie-Laure Boucheret , Marion Aubault , Hanaa Al Bitar

Cognizant Autonomous Systems for Safety Critical Applications Workshop - International Technical meeting and showcase of GNSS technology, products and services - ION GNSS+ 2018, Institute of Navigation (ION), Jan 2018, Reston (Virginie), United States. pp.(electronic medium)

Communication dans un congrès hal-03023415v1
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Signal optimization for Galileo evolution

Lorenzo Ortega

Networking and Internet Architecture [cs.NI]. Institut National Polytechnique de Toulouse - INPT, 2019. English. ⟨NNT : 2019INPT0118⟩

Thèse tel-04169759v1
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Statistical Signal Processing for the Design of Navigation and Localization Systems

Lorenzo Ortega

Engineering Sciences [physics]. Université toulouse 3 Paul Sabatier, 2025

HDR tel-04978914v1