Video and papers available for on-demand viewing.

8:30 a.m. - 10:00 a.m. PST

Tutorial

GNSS (for Time Transfers)

Registration fee:
$400 if registered and paid by January 4
$450 if payment is received after January 4

For many decades, GPS has provided the fundamental synchronizing timing service supporting much of the world’s critical infrastructure. New GNSS services are emerging that will augment and enhance the robustness of the world’s timing services. This tutorial will provide an overview of how GNSS timing services operate and how their underlying timing references support these PTTI services.

Edward Powers Edward Powers works for the Aerospace Corporation as a PNT subject matter expert supporting USSF SSC GPS program and the “new” Space Development Agency's Navigation Cell as PNT technical lead. In 2018, Mr. Powers retired from government service after 31 years working at the United States Naval Observatory as Time Transfer Division Chief, and prior to that the Naval Research Lab.

10:15 a.m. - 11:45 a.m. PST

Tutorial

Introduction to Atomic Clocks

Registration fee:
$400 if registered and paid by January 4
$450 if payment is received after January 4

The tutorial introduces atomic clock technology with a focus on the mature technologies of industrial atomic clocks, which can be designed into deployable systems and applications.

Dr. Robert Lutwak Dr. Robert Lutwak is a Technical Fellow in Microchip’s Frequency and Time Systems business unit, supporting research and development of atomic oscillators and frequency standards.

12:45 p.m. - 2:15 p.m. PST

Tutorial

Optical Clocks

Registration fee:
$400 if registered and paid by January 4
$450 if payment is received after January 4

The fundamental principles that led to the development of modern optical clocks will be presented. Optical clocks based on trapped neutral atoms in optical lattices or single ions in rf traps currently realize the most accurate frequency standards. An overview of these optical clocks and a comparison of their respective performances will be given. Additional topics may include the basic operation of our standard to a discussion of key systematic shifts that must be well-understood and controlled to achieve high accuracy.

Dr. Susannah Dickerson Dr. Susannah Dickerson is a staff scientist at Draper where she is involved in the design, fabrication, and testing of compact optical atomic clocks and quantum gravimeters. Prior to joining Draper in 2017, she completed a postdoc at Harvard and her doctorate at Stanford.

2:30 p.m. - 4:00 p.m. PST

Tutorial

Optical Transfers

Registration fee:
$400 if registered and paid by January 4
$450 if payment is received after January 4

Any TF transmission in optical fibers will ultimately be limited by the physics of the fiber and optoelectronics. The tutorial will present the basics, such as attenuation, dispersion, polarization and other sources of perturbations, and how these effects are harnessed to perform ultra-high-performance TF transfer.

Dr. Per Olof Hedekvist Dr. Per Olof Hedekvist has a PhD in Photonics on fiber nonlinearities. He has been with RISE (Swedish NMI) since 2005, working on TF transfer techniques and as teacher in metrology.

 

4:15 p.m. - 5:45 p.m. PST

Tutorial

Optical Combs

Registration fee:
$400 if registered and paid by January 4
$450 if payment is received after January 4

Optical frequency combs are highly versatile tools for precision measurements. Providing phase coherent frequency references across the entire optical spectrum, they offer users a unique combination of broad spectral coverage, high spectral resolution, and a calibrated frequency scale. As a result, they have found numerous applications in frequency metrology and beyond. This tutorial will explain how optical frequency combs work, covering the fundamental principles, some practical details, and modern developments.

Dr. Ryan Gelly Dr. Ryan Gelly is a staff scientist at Draper in the photonics systems group. He is responsible for the design, microfabrication, and characterization of integrated photonic devices. Before coming to Draper, Ryan completed his PhD in physics at Harvard University in 2022.

9:00 a.m. - 12:15 p.m. PDT

Plenary
Welcome

KEYNOTE: Advanced Air Mobility: Future of Aviation?

This talk will present the potential of Advanced Air Mobility, and the design space and challenges of building a battery electric Urban Air Mobility vehicle. It will also discuss some of the important enabling technologies and gaps including batteries, compute, navigation, communications, AI/ML, and manufacturing.

Dr. Han Park, Deputy CTO and Head of R&D, Supernal
Dr. Han Park is currently the Deputy CTO of Supernal, an Urban Air Mobility division of Hyundai Motor Group. Prior to Supernal, he was a Vice President of Engineering at Samsung Electronics where he led autonomous driving and robotics programs. He received his BS in Mechanical Engineering from the University of California, Berkeley, an MBA from UCLA Anderson School of Management, an SM in Mechanical Engineering from Massachusetts Institute of Technology, and a Ph.D. in Aeronautical Engineering with a Minor in Electrical Engineering from California Institute of Technology.

KEYNOTE: The Future of Industrial Atomic Clocks

Over the past several decades, laboratory atomic clocks have been improving far faster than their industrial counterparts. We discuss the expected improvements in industrial clock products in the near future.

Dr. Elizabeth Donley, Chief of the Time and Frequency Division, NIST
Dr. Elizabeth Donley is Chief of the NIST Time and Frequency Division and has served as Working Group Chair for the revisions of IEEE Standards 1139 and 1193. She is an experimental physicist by training, with research experience in Bose-Einstein condensation, the maintenance and development of NIST’s atomic fountain clocks, NMR gyroscopes, and the development of compact cold-atom clocks and inertial sensors. She has authored or co-authored close to 100 papers in technical journals. She has been serving as Chief of the Time and Frequency Division since November of 2018.

Her service to the time and frequency community includes organizing symposia and training at national and international conferences, serving as VP for Frequency Control for the IEEE UFFC Society, and advising graduate students from the University of Colorado. She has also served as the Working Group Chair for the revision of two IEEE standards on the topic of frequency control. She received her B.Sc. in Physics from the University of Nevada, M.Sc. in Physics from the University of Colorado and a Ph.D. in Natural Sciences from the Swiss Federal Institute of Technology, Zürich.


EXHIBITOR PRESENTATIONS, 11:45 a.m. - 12:15 p.m.

Moderated and Organized by: Francine Vannicola, Naval Research Laboratory

Exhibitors will have 3-minutes each to describe new commercial applications available for viewing in their exhibit booth.

ITM Sessions

On-Demand sessions will remain available for 30 days.

Tuesday Sessions

ITM Session A1
 

Session Chairs:

Dr. Okuary Osechas
German Aerospace Centre (DLR) 
Dr. Michael O'Connor
Satelles

2. Protection Level Formulations for Distance Measuring Equipment (DME)
       
Brandon Weaver, Gianluca Zampieri, Okuary Osechas, German Aerospace Center
Peer Reviewed
3. LDACS APNT Protocol and Measurement Signal Processing Architecture
       
Gary McGraw, Consultant - Genova Technologies; Gianluca Zampieri, German Aerospace Center (DLR) and RWTH Aachen University; Okuary Osechas, DLR; Michael Meurer, DLR and RWTH Aachen University; Sai Kalyanaraman, Collins Aerospace
Peer Reviewed
4. The use of the Frequency Difference of Arrival of 1090 MHz ADS-B Signals for Wide Area Multilateration
       
Shang-Ping Weng and Shau-Shiun Jan, Department of Aeronautics and Astronautics, National Cheng Kung University
Peer Reviewed
5. Timekeeping with a Chip Scale Atomic Clock in GPS Denied Environments
       
Jade Babcock-Chi, Lucca Trapani, University of Colorado at Boulder; Dennis Akos, University of Colorado Boulder, Stanford University
Peer Reviewed
6. Apparatus, Systems, and Methods for Determining a Geo-Location
       
Qirfiraz Siddiqui, noGPS Technologies Inc.
7. Low Earth Orbit Navigation System (LEONS): Scalable GNSS-Independent Time Transfer and Positioning for Space Users
       
Paul Anderson, George Schmitt, Patrick Shannon (TrustPoint, Inc.)
Peer Reviewed
8. The Need for GBaaS as GPS/GNSS is no Longer a Reliable Source for Critical PNT Infrastructure
   
Nino De Falcis, Oscilloquartz
Virtual Presentations
Efficient Fingerprint-Map Generating Method for IEEE 802.11 Indoor Positioning Using SRGAN
       
Hwang Jun Gyu, Kyungpook National University; Cui Shuyu, Kyungpook National University; Lee Chang-ho, Mobile Testing & Compliance Certification Lab.; Park Joon Goo, Kyungpook National University
Peer Reviewed
Fusing Vehicle Trajectories and GNSS Measurements to Improve GNSS Positioning Correction Based on Actor-Critic Learning
       
Haoli Zhao, Zhenni Li, Ci Chen, Guangdong University of Technology; Lujia Wang, Hong Kong University of Science and Technology; Kan Xie, Shengli Xie, Guangdong Key Laboratory of IoT Information Technology
Peer Reviewed
Positioning Capability Characterization of 5G NR for GNSS Auxiliary Navigation
       
Lili Cao, Yuan Sun, Zhongliang Deng, School of Electronics Engineering, Beijing University of Posts and Telecommunications
Peer Reviewed
ITM Session B1
 

Session Chairs:

Dr. Edward LeMaster
Lockheed Martin
Dr. Grace Gao
Stanford University

1. Performance Analysis of Lunar Radio Navigation ODTS System
       
Cosimo Stallo, Carmine Di Lauro, Mattia Carosi, Enrico Edoardo Zini, Daniele Musacchio, Laura De Leo, Daniele Cretoni, Thales Alenia Space Italy TAS-I; Marco Laurenti, Thales Alenia Space France TAS-F; Henno Boomkamp, Telespazio Germany TPZ
Peer Reviewed
2. Ensemble Kalman Filter for Moon Transfer Orbit GPS Navigation
       
Masaya Murata, Japan Aerospace Exploration Agency
Peer Reviewed
3. Precise Positioning and Timekeeping in Lunar Orbit via Terrestrial GPS Time-Differenced Carrier-Phase Measurements
       
Keidai Iiyama, Sriramya Bhamidipati and Grace Gao, Stanford University
Peer Reviewed
4. Lunar Navigation Satellite System Design for In-Space Rescue Applications
   
Benjamin Johnis, Sanjeev Gunawardena, Air Force Institute of Technology; Avinash Agrawal, Draper
6. Precise Clock Estimation on Moon Surface Using Lunar Navigation Satellite System
       
Masaya Murata, Kyohei Akiyama, Naoki Satoh, Japan Aerospace Exploration Agency
Peer Reviewed
7. Exploiting Terrestrial Signals of Opportunity for LEO Smallsat Individual and Swarm Precision Navigation and Timing
       
James Schatzman, Augustus Aerospace Company
8. Verification of Space GPS Receiver Navigation Performance Based on Full-Orbit Navigation Solutions of CubeSat
       
Jaeuk Park, Hanjoon Shim, Yonghwan Bae, Changdon Kee, Department of Aerospace Engineering and SNU-IAMD, Seoul National University; Sunkyoung Yu, Samsung Electronics System LSI

Wednesday Sessions

ITM Session A2
 

Session Chairs:

Dr. Santiago Perea
European Space Agency
Elisa Gallon
Illinois Institute of Technology

1. Experimental Results of Integrity Monitoring for UAV Flights in Urban Environment Leveraging Image Based Masking
       
Heiko Engwerda, Merle Snijders, Juliette Casals Sadlier, Royal Netherlands Aerospace Centre (NLR)
Peer Reviewed
2. Integrity Monitoring for Urban Air Mobility Using Time-Differenced Carrier Phase
       
HoJoon Jeong, Changdon Kee, Department of Aerospace Engineering and SNU-IAMD, Seoul National University; Junesol Song, Division of Mechanical Engineering, The University of Suwon; Jungbeom Kim, Samsung Electronics system LSI
3. Network-Based Augmentation System (NBAS) Architectures Optimized to Support Urban Air Mobility (UAM)
       
Jiyun Lee, Gihun Nam, Dongchan Min, Andrew Sun, Korea Advanced Institute of Science and Technology (KAIST), and Sam Pullen, Stanford University
Peer Reviewed
4. On the Performance of a Cascade of Barriers of Multipath Feared Events for High Accuracy High Integrity Train Positioning
       
Michele Brizzi, Roma Tre University; Sandro Chiocchio, Arianna Persia, Radiolabs; Alessandro Neri, Roma Tre University & Radiolabs
Peer Reviewed
5. Analysis of Contributions to the ARAIM Continuity Budget
       
Joseph E. Dennis, Peter Gardner, Tetra Tech
Peer Reviewed
6. Satellite Clock and Ephemeris Error Bounding Characterization for Galileo and Estimated CNAV
       
Xinwei Liu, Rebecca Wang, Juan Blanch, Todd Walter, Stanford University
Peer Reviewed
7. Solution Separation-Based Integrity Monitoring for Integer Ambiguity Resolution-Enabled GNSS Positioning
       
Shizhuang Wang, Xingqun Zhan, Yawei Zhai, and Zhen Gao, School of Aeronautics and Astronautics, Shanghai Jiao Tong University
Peer Reviewed
8. AI-based GNSS Spoofing Attack Detection for Autonomous Vehicles using Satellite Characteristics Data
       
Sagar Dasgupta, Mizanur Rahman, Thejesh N. Bandi, University of Alabama
Alternate
1. Carrier Phase Residual Modeling and Fault Monitoring using Short-Baseline Double Difference and Machine Learning
   
Yebin Lee, Dong-Kyeong Lee, Byungwoon Park, Sejong University
Virtual Presentations
A Novel Integrity Monitoring Algorithm for FGO-Based GNSS Positioning System
       
Fankun Meng, Yuan Sun, Zhongliang Deng, School of Electronics Engineering, Beijing University of Posts and Telecommunications
Peer Reviewed
Integrity Monitoring for Extreme Indoor Environment Positioning Based on Ultrawideband
       
Jianing Li, Yuan Sun, Zhongliang Deng, School of Electronics Engineering, Beijing University of Posts and Telecommunications
Peer Reviewed
Integrity Monitoring for Real-time Orbit Corrections based on Prior Statistic Parameters
       
Jie Zhang, Fuxin Yang, Liang Li, Guoze Dong, Lin Zhao, College of Intelligent Systems Science and Engineering, Harbin Engineering University
Peer Reviewed
Integrity Monitoring of Cycle Slip Detection in Observation Domain for Carrier Phase-Based Differenced Positioning
       
Zhao Lin, Li Yang, Jia Chun, Li Liang, Yang Shufan, Jiang Jiachang, College of Intelligent Systems Science and Engineering, Harbin Engineering University
Peer Reviewed
Measurements-Assisted ARAIM Based on Sparse Estimation of Pseudorange Deviations
       
Hangtian Qi, Xiaowei Cui, Mingquan Lu, Tsinghua University
Peer Reviewed
ITM Session B2
 

Session Chairs:

Dr. Brian Breitsch
University of Colorado, Boulder
Dr. Anthea Coster
MIT Haystack Observatory

1. Evaluation of Tropospheric and Mixed Single - Dual Frequency Error Models in Advanced RAIM
       
Juan Blanch, Todd Walter, Frank Lai, Stanford University
Peer Reviewed
2. Troposphere Delay Model Error Analysis With Application to Vertical Protection Level Calculation
       
Yu-Fang Lai, Juan Blanch, Todd Walter, Stanford University
Peer Reviewed
3. Real-time Capable Tropospheric Modeling for SBAS-PPP
   
Shrivathsan Narayanan, Okuary Osechas, Mohammed Mainul Hoque, German Aerospace Center (DLR), Germany; Authie Thierry, Thales Alenia Space; Carlos Lopez, European Space Agency (ESA)
Peer Reviewed
4. Availability Assessment of Dual-Frequency GNSS-Based Augmentation Systems Under Equatorial Ionospheric Scintillations
       
K. Andrew Sun, Jaehee Chang, Jiyun Lee, Korea Advanced Institute of Science and Technology (KAIST); Brian Breitsch, Y. Jade Morton, University of Colorado Boulder
Peer Reviewed
5. Machine Learning-Based Ionospheric Modelling Performance During High Ionospheric Activity
       
Shishir Priyadarshi, Wahyudin Syam, Andrés Abelardo García Roqué, Alejandro Pérez Conesa, GMV; Guillaume Buscarlet, Raül Orús Pérez, Mickael Dall’ Orso, European Space Agency (ESA)
Peer Reviewed
6. Results of One-Year Observation of a Jamming Interferer Degrading Amplitude Scintillation Indices in GISTM Receiver
       
Alex Minetto, Department of Electronics and Telecommunications, Politecnico di Torino; Emanuele Pica, Claudio Cesaroni, Istituto Nazionale di Geofisica e vulcanologia (INGV); Fabio Dovis, Department of Electronics and Telecommunications, Politecnico di Torino
Peer Reviewed
7. Initial Carrier Phase Processing for the Haleakala Mountaintop GNSS-R Experiment
   
Brian Breitsch and Jade Morton, University of Colorado, Boulder
Peer Reviewed
8. Impacts of High Rate GNSS Satellite Clock Estimation on Radio Occultation Bending Angle Retrievals: Preliminary Report
       
Jian Yao, Jan-Peter Weiss, Teresa VanHove, University Corporation for Atmospheric Research (UCAR)
ITM Session A3
 

Session Chairs:

Dr. Andriy Konovaltsev
German Aerospace Center (DLR)
Mathew Cosgrove
Northrop Grumman

1. Effects of Interference from Non-Standard C/A Waveforms
       
John W. Betz, Christopher J. Hegarty, Jeffry T. Ross, Gary M. Okerson, The MITRE Corporation
2. Addressing a Critical Vulnerability in Upcoming Broadcast-Only TESLA-Based GNSS-Enabled Systems
       
Jason Anderson, Sherman Lo, Todd Walter, Stanford University
Peer Reviewed
3. Live-Sky GNSS Signal Processing Using a Dual-Polarized Antenna Array for Multipath Mitigation
       
Eric Hahn, Sanjeev Gunawardena, Air Force Institute of Technology; Chris Bartone, Ohio University
Peer Reviewed
4. Comparison of CRPA Direction of Arrival Methods on Post Correlated GNSS Signals for Solution Authentication and Spoofing Detection
       
C. Anderson Givhan, Scott M. Martin, Auburn University
Peer Reviewed
5. Analysis of GNSS disruptions in European Airspace
       
Michael Felux, Benoit Figuet, Manuel Waltert, Patric Fol, Zurich University of Applied Sciences; Martin Strohmeier, Armasuisse; Xavier Olive, ONERA – DTIS, Université de Toulouse
Peer Reviewed
6. Investigation of GPS Interference Events with Refinement on the Localization Algorithm
       
Zixi Liu, Juan Blanch, Sherman Lo, Todd Walter, Stanford University
Peer Reviewed
7. A Graphical Way of Continuous GNSS Spoofing Detection at the Baseband Signal Level
       
Jingxiaotao Fang, Department of Aeronautical and Aviation Engineering, The Hong Kong Polytechnic University, Hong Kong SAR; Jiang Yue, College of Science, Hohai University; Bing Xu, Department of Aeronautical and Aviation Engineering, The Hong Kong Polytechnic University, Hong Kong SAR
Peer Reviewed
8. GPU Computing of GNSS Chipshape
       
Tyler Bransfield, Sanjeev Gunawardena, Air Force Institute of Technology
Peer Reviewed
Alternate
1. GNSS Spoofing Detection for High Integrity and Continuity Applications
       
Cagatay Tanil, Amazon Prime Air
Virtual Presentations
A GNSS Spoofing Detection Method Based on Raw GNSS/IMU/Camera Measurements
       
Xiao Zhou, Hong Li, Mingquan Lu, Department of Electronic Engineering, Beijing National Research Center for Information Science and Technology, Tsinghua University
Evaluation of the Effects of the DME Beacons on BDS B2a Signals in China Hotspots
       
Yiming Wang, School of Electronic Information Engineering, Beihang University; Qiongqiong Jia, Civil Aviation University of China; Kai Guo, Zhipeng Wang, Yanbo Zhu, School of Electronic Information Engineering, Beihang University
Peer Reviewed
Rotating Dual Antennas Based Detection Method For Distributed GNSS Spoofing Attacks
       
Hao Wang, Hong Li, Mingquan Lu, Department of Electronic Engineering, Beijing National Research Center for Information Science and Technology (BNRist), Tsinghua University
Peer Reviewed
ITM Session B3
 

Session Chairs:

Dr. Nikolay Mikhaylov
Robert Bosch Corp.
Laura Norman
Hexagon

1. Localization & Mapping Requirements for Level 2+ Autonomous Vehicles
       
Tyler G.R. Reid, Andrew Neish, Brian Manning, Xona Space Systems
Peer Reviewed
2. Non-Line-of-Sight GNSS Ray Tracing and Rectification in Urban Canyons by LiDAR-Based Surface Reconstruction
       
Roland Pugliese, Di Hai, and Dirk Abel, RWTH Aachen University
Peer Reviewed
3. Adaptive Robust-Statistics GNSS Navigation Based on Environmental Context Detection
       
Yi Ding, Airbus SAS and ISAE-SUPAERO, University of Toulouse; Florent Feriol, ISAE-SUPAERO, University of Toulouse; Yoko Watanabe, ONERA (DTIS); Philippe Asseman, Airbus SAS; Gaël Pages, ISAE-SUPAERO, University of Toulouse; Damien Vivet, ISAE-SUPAERO, University of Toulouse
Peer Reviewed
Virtual Presentations
Integration of Vehicle Dynamic Model and System Identified Model for Navigation in Autonomous Mobile Robots
       
Penggao Yan, Li-Ta Hsu, and Weisong Wen, Department of Aeronautical and Aviation Engineering, The Hong Kong Polytechnic University
Peer Reviewed
Semi-Supervised Learning Technique For Multipath-Classification in NavIC System
Ashish K Shukla, Space and Applications Centre, Ahmedabad, India Utsav Mehta, Pandit Deendayal Energy University
Peer Reviewed

Thursday Sessions

ITM Session A4
 

Session Chairs:

Ryan Dixon
Hexagon
Dr. Naser El-Sheimy
University of Calgary

1. Adaptive Fusion of Navigation Solutions from Measurement Subsets
       
Chun Yang and Andrey Soloviev, QuNav
Peer Reviewed
2. Interacting Multiple Model Particle Filter for Indoor Positioning Applications
       
Toni Fetzer, Markus Bullmann, Markus Ebner, Steffen Kastner, and Frank Deinzer, Faculty of Computer Science and Business Information Systems, University of Applied Sciences Würzburg-Schweinfurt; Marcin Grzegorzek. Institute of Medical Informatics, University of Lübeck
Peer Reviewed
3. Performance Analysis of Deep Learning Supported Kalman Filter
       
Shuo Li, Nikolay Mikhaylov, Robert Bosch GmbH; Thomas Pany, Bundeswehr University Munich
Peer Reviewed
4. Intersection of Error Ellipsoids from at Least Two Positioning Sensors for Improved Sensor Fusion
   
Patrick Henkel, Medeea Horvat and Luka Sachße, ANavS GmbH
Peer Reviewed
5. A Study on Improving Smartphone Precise Positioning Performance Through Antenna Calibration According to Smartphone Attitude
       
Jong-Heon Kim, Bogeun Cho, Bu-Gyeom Kim, Changdon Kee, Sunkyoung Yu, JungBeom Kim, Department of Aerospace Engineering, and the Institute of Advanced Machines and Design, Seoul National University - Samsung Electronics System LSI
6. A Novel GNSS Positioning Method for Urban Canyons in Measurement Domain
       
Huan Luo, Wu Chen, Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University
Peer Reviewed
7. Rail Digital Map Construction on GNSS Denied Areas
       
Michele Brizzi, Roma Tre University; Francesca D'Orazio, Radiolabs; Alessandro Neri, Roma Tre University & Radiolabs
8. Evaluating Navigation Augmentation with LTE in the Urban Signal Environment
       
Andrew Brevick, Kirsten Strandjord, University of Minnesota - Twin Cities; Pai Wang, Shanghai Jiao Tong University
Virtual Presentations
Data-Driven Inertial Navigation assisted by 5G UL-TDoA Positioning
       
Hossein Shoushtari, HafenCity University, Geodesy and Geoinformatics; Dorian Harder, HafenCity University, Geodesy and Geoinformatics; Maximilian Kasparek, Fraunhofer IIS; Matthias Schäfer Fraunhofer IIS; Jörg Müller-Lietzkow, HafenCity University, Economy and Digitization; Harald Sternberg, HafenCity University, Geodesy and Geoinformatics.
Peer Reviewed
L2VCali: A Dataset for LiDAR and Vision-Based Sensor Calibration in Structural Indoor Environments
       
Mengchi Ai, Ilyar Asl Sabbaghian Hokm Abadi, Naser El-Sheimy, Mobile Multi-Sensor Systems Research Group Department of Geomatics Engineering, The University of Calgary
Peer Reviewed
Ocean Real-Time PPP/INS Tight Coupled Integration Method with the BeiDou ShortMessage Communication
       
Xiaosong Liu, Lin Zhao, Fuxin Yang, Jie Zhang, Luehan Gao, College of Intelligent Systems Science and Engineering, Harbin Engineering University
Peer Reviewed
ITM Session B4
 

Session Chairs:

Dr. Sanjeev Gunawardena
Air Force Institute of Technology
Dr. Yu-Hsuan Chen
Stanford University

1. A 3-Features Assessment of the On-Orbit Performance of GNSS Satellite Antennas: The Case of GLONASS R719 and R720
       
Gerardo Allende-Alba, Peter Steigenberger, Institute of Communications and Navigation, German Aerospace Center (DLR); Steffen Thoelert, DLR - RWTH Aachen University
Peer Reviewed
2. In-Situ Calibration of GPS Antenna Array with Ambient Signals
       
Chun Yang and Andrey Soloviev, QuNav
Peer Reviewed
3. Accelerating a Software Defined Satnav Receiver using Multiple Parallel Processing Schemes
       
Logan Reich, Sanjeev Gunawardena, Air Force Institute of Technology; Michael Braasch, Ohio University
Peer Reviewed
4. Examining Cross Frequency Interference Effects in Multi-Frequency GNSS Receivers
       
Sherman Lo, Yu Hsuan Chen, Nicolas San Miguel, Todd Walter, Stanford University; Dennis Akos, University of Colorado Boulder
Peer Reviewed
5. Characterizing GNSS Multipath in Challenging Installation Scenario Using Combined Simulation -Measurements of Dual-Polarization Antennas
       
Ernest Ofosu Addo, Stefano Caizzone Institute of Communications and Navigation, German Aerospace Center (DLR)
6. Multipath Parameters Estimation in Physically Based Synthetic Environment Using Robust Deep Neural Regression
       
Thomas Gonzalez, Oktal-Synthetic Environment and ENAC Université de Toulouse; Antoine Blais, ENAC Université de Toulouse; Nicolas Couellan, ENAC Université de Toulouse and Institut Mathématiques de Toulouse; Christian Ruiz, Oktal-Synthetic Environment
7. Comparison of a Neural Network and Viterbi Decoder on Forward Error Corrected CNAV Messages
       
Stefan Orosco, Yu-Hsuan Chen, Todd Walter, Sherman Lo, Stanford University
Peer Reviewed
8. Receiver-Specific GNSS Inter-System Bias in Low Earth Orbit
   
Sabrina Ugazio, Zachary Arnett, Ryan McKnight, and Brian C. Peters, Ohio University
Virtual Presentations
Fuzzy C-Mean Clustering Based NLOS Signal Identification Method and Localization Model in Urban Canyon Environment
       
Yilang Zhang, Yuan Sun, Zhongliang Deng, School of Electronics Engineering, Beijing University of Posts and Telecommunications
Peer Reviewed
NLOS/LOS Classification by Constructing Indirect Environment Interaction from GNSS Receiver Measurements Using a Transformer-Based Deep Learning Model
       
Zhenni Li, Guangdong University of Technology; Kungan Zeng, Sun Yat-sen University; Lujia Wang, Hong Kong University of Science and Technology; Xie Kan, Rong Yuan, Shengli Xie, Guangdong University of Technology
Peer Reviewed
Precise Real-Time Doppler Positioning Using a Stand-Alone GNSS Receiver
       
Ziheng Zhou, Hong Li, Mingquan Lu, Department of Electronic Engineering, Beijing National Research Center for Information Science and Technology (BNRist), Tsinghua University
Rao-Blackwellized Particle Filter for Scintillation Detection and Position/Bias Estimation of Low-Latitude GNSS Receivers
       
Paulo R. P. Silva, Marcelo G. S. Bruno, Instituto Tecnológico de Aeronáutica, and Alison O. Moraes, Instituto de Aeronáutica e Espaço
Peer Reviewed
ITM Session A5a
 

Session Chairs:

Dr. Kazuma Gunning
Xona Space Systems
Dr. Chun Yang
QuNav

1. A Map-Matching Based Positioning Method Using Doppler Tracking and Estimation by a Software-Defined Receiver for Multi-Constellation LEO Satellites
       
Hirotaka Kanamori, Kaito Kobayashi, and Nobuaki Kubo, Tokyo University of Marine Science and Technology, Japan
Peer Reviewed
2. GNSS Constellation Performance Using ARAIM with Inclined Geosynchronous Satellite and Low-Earth-Orbit Satellite Augmentation
       
Sam Pullen, Sherman Lo, Isaiah Colobong, Sukrut Oak, Juan Blanch, Todd Walter Stanford University; Mark Crews, Robert Jackson, Stephen Young, Kevin Huttenhoff
Peer Reviewed
3. Direct Positioning Estimation Beyond the Constellation Using Falcon Gold Data Collected on Highly Elliptical Orbit
   
Kirsten Strandjord, Faith Cornish, Department of Aerospace Engineering and Mechanics, University of Minnesota Twin Cities
4. Performance Analysis of a Cellular LTE and GPS L1 C/A Vector Tracking Receiver, a Simulation Study
       
Samuel Morgan and Scott Martin, Auburn University
Virtual Presentations
GNSS Spoofing Identification with Assistance of LEO Satellite Signal
       
Yiwei Wang, Yanhong Kou, Zhigang Huang, School of Electronics and Information Engineering
Peer Reviewed
On the Very Short and Very Long LEO Satellite Orbit Prediction
       
Kan Wang, National Time Service Center (NTSC), Chinese Academy of Sciences (CAS) & University of Chinese Academy of Sciences; Ahmed El-Mowafy, School of Earth and Planetary Sciences, Curtin University; Hang Su, NTSC; Xuhai Yang, NTSC, CAS & University of Chinese Academy of Sciences
Peer Reviewed
ITM Session A5b
 

Session Chairs:

Dr. Adam Rutkowski
Air Force Research Laboratory
Dr. Kirsten Strandjord
University of Minnesota

1. Performance Evaluation and Hybrid Application of the Greedy and Predictive UAV Trajectory Optimization Methods for Localizing a Target Mobile Device
       
Halim Lee and Jiwon Seo, Yonsei University
Peer Reviewed
2. Environment Context Detection of Wearable GNSS Using Machine Learning Algorithm
Youmin Joung, Sunkyoung Yu, Junbeom Kim, Soyoung Park, Kisoo Yu, Samsung Electronics
Peer Reviewed
3. A Distributed, Collaborative Strategy for In-Situ Monitoring of Multipath Errors
   
Okuary Osechas, Shrivathsan Narayanan, Gianluca Zampieri, Brandon Weaver, German Aerospace Center - DLR
4. TerraPoiNT: A Terrestrial Navigation System
   
Sameet Deshpande, Arun Raghupathy, NextNav Inc
Virtual Presentations
A Node Selection Method for Multi-vehicle Cooperative Positioning Base on CRLB
       
Hanbiao Gong, Hongbo Zhao, Shan Hu, Chen Zhuang, Beihang University
Peer Reviewed
ITM Session B5a
 

Session Chairs:

Dr. Charles Toth
The Ohio State University
Dr. Madeleine Naudeau
Air Force Research Laboratory

1. Experimentation on ARAIM Evolutions for Non-Aviation Applications
       
Javier Fidalgo, Enrique Domínguez, Ginés Moreno, Fulgencio Buendía, Joao Pedro Duque, GMV; Merle Snijders, Heiko Engwerda, Netherlands Aerospace Centre; Ettore Canestri, Daniel Lopour, Marco Porretta, Natalia Castrillo, EU Agency for the Space Programme; Santiago Perea, European Space Agency; Ilaria Martini, Matteo Sgammini, Juan Pablo Boyero, European Commission
Peer Reviewed
2. Assessment of Differential Doppler Navigation with Starlink LEO Satellite Signals of Opportunity
   
Samer Hayek, Joe Saroufim, Mohammad Neinavaie, Sharbel Kozhaya, and Zaher M. Kassas, The Ohio State University
3. A RFI Testbed for Examining GNSS Integrity in the Various Environments
       
Yu-Hsuan Chen, Zixi Liu, Juan Blanch, Sherman Lo, Todd Walter, Stanford University
Peer Reviewed
4. Characterizing Perspective Error in Voxel-Based LIDAR Scan Matching
       
Jason H. Rife and Matthew McDermott, Tufts University
Peer Reviewed
Alternate
2. Extended Kalman Filter-Based Integrity Monitoring with 3D Map-aided Outlier Rejection for GNSS/SOP/INS Integrated Navigation
Mu Jia and Zak (Zaher) Kassas, The Ohio State University
Virtual Presentations
GNSS Signal Authentication using QZSS Signal and Evaluation of Key Performance Indicators
       
Dinesh Manandhar, Ryosuke Shibasaki, Center for Spatial Information Science, The University of Tokyo
ITM Session B5b
 

Session Chairs:

Dr. Daniel Medina
German Aerospace Center (DLR)
Dr. Patrick Henkel
Technical University Munich

1. RTK Availability Prediction Using a 3D City Model and Machine Learning
       
Kaito Kobayashi and Nobuaki Kubo, Tokyo University of Marine Science and Technology
Peer Reviewed
2. Precision-Aided Partial Ambiguity Resolution Scheme for GNSS Attitude Determination
   
J. Manuel Castro-Arvizu, Trimble Terrasat; Daniel Medina, Institute of Communications and Navigation, German Aerospace Center (DLR); Jordi Vilà-Valls, Institut Supérieur de l’Aéronautique et de l’Espace (ISAE-SUPAERO), University of Toulouse
Peer Reviewed
3. Characterization and Comparison of Galileo and GPS Anomalies
       
Rebecca Wang, Todd Walter, Stanford University
Peer Reviewed
4. Analysis of RTK Positioning Accuracy Using Antenna Calibrated Commercial Samsung Smartphone
       
Bu-Gyeom Kim, Jong-Heon Kim, Changdon Kee, Department of Aerospace Engineering and SNU-IAMD, Seoul National University; Sunkyoung Yu, Jungbeom Kim, Samsung Electronics System LSI
Virtual Presentations
A Multi-GNSS PPP Partial Ambiguity Resolution Method Based on Observations Weight Ranking
       
Zhiguo Sun, Lin Zhao, Fuxin Yang, Jie Zhang, Ruizhe Zhang, College of Intelligent Systems Science and Engineering, Harbin Engineering University
Peer Reviewed
Real-time Kinematic Positioning Algorithm in Graphical State Space
       
Sudan Yan, Shaolin Lü, GraphOptimization Inc.; Gang Liu, Yiding Zhan, Department of Electronic Engineering, Tsinghua University; Jianan Lou, Rong Zhang, Department of Precision Instrument, Tsinghua University

PTTI Sessions

On-Demand sessions will remain available for 30 days.

Tuesday Sessions

PTTI Session P1a
 

Session Chairs:

Dr. Roberto Diener
ONR
Dr. Franklin Ascarrunz
Spectradynamics

1. A Strontium Optical Clock Infrastructure Based on Metasurface Optics and Integrated Photonics
   
Andrew R. Ferdinand, Sindhu Jammi, Zheng Luo, University of Colorado Boulder, Time and Frequency Division NIST; Zach L. Newman, University of Colorado Boulder, Time and Frequency Division NIST, Octave Photonics; Wenqi Zhu, Microsystems and Nanotechnology Division NIST; David R. Carlson, Time and Frequency Division NIST, Octave Photonics; Will Lunden, Dan Sheredy, Parth Patel, Vector Atomic Inc; Grisha Spektor, University of Colorado Boulder, Time and Frequency Division NIST; Martin M. Boyd, Vector Atomic Inc.; Amit Agrawal, Microsystems and Nanotechnology Division NIST; Scott B. Papp, University of Colorado Boulder, Time and Frequency Division NIST
2. Progress on a Tactical Ytterbium Microwave Ion Clock
       
Xianli Zhang, Jay Noble, Jonathan Tallant, Hyunwook Park, Michelle Nguyen, Jackie Ellett, Dan Boschen, Mike Silveira, Cody Dutra, Luan Vo, Anders Herrmann, Kevin Wellwood, Armando Martins, and K. Richard Overstreet, Microchip Technology
3. Compact Frequency Combs for Deployable Optical Atomic Clocks
   
Henry Timmers, Bennett Sodergren, Andrew Attar, Star Fassler, Cole Smith, Jason Pinon, Kurt Vogel, and Kevin Knabe, Vescent Photonics
4. Industrial Optically-Pumped Cesium Beam Clock
   
Patrick Berthoud, Manual Haldimann, Fabiano Kroll, Vladimir Dolgovskiy, Oscilloquartz SA
PTTI Session P1b
 

Session Chairs:

Dr. Jonathan Hoffman
DARPA
Dr. Jenna Chan
Army Research Laboratory

1. Empirical Measurements of Teledyne CSAC TempCo and Drift Performance
       
Nicholas Kotsianas, Katherine Tyler, Robert Borwick III, Teledyne Scientific
2. Tantala Nonlinear Integrated Photonics for Portable Optical Clocks

Travis C. Briles, Time and Frequency Division, National Institute of Standards and Technology; David R. Carlson, Octave Photonics, Louisville; Jennifer Black, Time and Frequency Division, National Institute of Standards and Technology; Jizhao Zang, Grisha Spektor, Yan Jin, Scott Papp, Time and Frequency Division, National Institute of Standards and Technology & University of Colorado
3. High-efficiency Optical Frequency Comb Generation in Microresonators
   
Jizhao Zang, Su-peng Yu, Time and Frequency Division, National Institute of Standards and Technology, University of Colorado; David R. Carlson, Travis C. Briles, Time and Frequency Division, National Institute of Standards and Technology; Yan Jin, Haixin Liu, and Scott B. Papp, Time and Frequency Division, National Institute of Standards and Technology, University of Colorado
4. Developing Low SWaP-C Chip-scale Optical Clock

Weimin Zhou, James Cahill, Jimmy Ni, Andrew DeLoach, Tanvir Mahmood, Sang-Yeon Cho, Jason Sun, and Stephen Anderson, US Army CCDC-ARL; Logan Courtright, Curtis Menyuk, University of Maryland Baltimore County; John Bowers, University of California at Santa Barbara; Lue Wu, and Kerry Vahala, California Institute of Technology

Wednesday Sessions

PTTI Session P2a
 

Session Chairs:

Dr. James Camparo
The Aerospace Corporation
Dr. Thejesh N. Bandi
The University of Alabama

1. Development and Performance of a Digital Rubidium Atomic Frequency Standard (DRAFS) as a Next-Generation Space Clock
       
Christopher Varuolo, Igor Shtaerman, Daniel J. Clark, Jason Napodano, Paul Skibiel, Nicholas Aji, Thomas McClelland - Frequency Electronics, Inc.
2. Demonstration of Micro Mercury Trapped Ion Clock Prototypes
   
Thai M. Hoang, Sang K. Chung, Thanh Le, John D. Prestage and Nan Yu, Jet Propulsion Laboratory, California Institute of Technology,
3. Rack-Mounted Cold Atom Microwave Atomic Clock with Paths to Commercialization for GPS-Denied Environments
Andrew Kortyna, Judith Olson, Gabriel Ycas, Jim Duncan, Evan Salim, Hugo Leon, ColdQuanta
4. Deployable Optical Atomic Clocks
   
Jonathan D. Roslund, Arman Cingoz, Abijith S. Kowligy, William D. Lunden, Guthrie B. Partridge, Franklin R. Roller, Dan Sheredy, Gunnar Skulason, Joe Song, Jamil R. Abo-Shaeer, Martin M. Boyd, Vector Atomic, Inc.
PTTI Session P2b
 

Session Chairs:

Dr. John Janis
L3-Harris
Dr. John Elgin
Air Force Research Laboratory

1. IEEE P1952 – Resilient Positioning, Navigation, and Timing User Equipment Working Group
Doug Arnold, Meinberg USA; Shelby Savage, The MITRE Corporation; Steve Guendert, IBM Corporation
2. Preventing Time from Becoming Obsolete: Supporting the 5071A Cesium Primary Frequency Reference into the Next Decade
       
David Chandler, Christopher Leissner, Peter Cash, Microchip
3. Developing a GNSS Space-Clock: Recent Experiences of a Space-Clock Designer
   
Thejesh N. Bandi, Department of Physics & Astronomy, College of Arts & Sciences, The University of Alabama
4. Advanced Atomic Clock Research at The Aerospace Corporation
   
Zachary Warren, James Camparo, The Aerospace Corporation
PTTI Session P3a
 

Session Chairs:

Greg Weaver
JHU-APL/SDA
Chris Erickson
Space Force

1. Precision Timing with LEO Satellite Time and Location Signals
       
Austin M. Smith and David M. Bevly, Auburn University
2. Measuring the Timing Accuracy of Satellite Time and Location (STL) Receivers
       
Peter B. Johnson, Satelles; Andrew N. Novick, Michael A. Lombardi, National Institute of Standard and Technology (NIST)
3. Integrated Optical Transceivers for Frequency Comb-Based Time Transfer over Free Space
   
A. Cingoz, A. Kowligy, J. Roslund, J. Abo-Shaeer, M. Boyd, W. Lunden, F. Roller, Vector Atomic; E. Caldwell, N. Newbury, L. Sinclair, B. Stuhl, W. Swann, National Institute of Standards and Technology; Jean-Daniel Deschenes, Octosig Consulting
4. Two-Way Time Transfer Over a 10 Gbit/s Optical Link for Synchronization and Distributed Sensing Applications
       
Justin Zobel, Raef Youssef, Stephen Rintoul, Jane Gilligan, Michael Brown, Lindsey Marinello, Elad Siman-Tov, Sean O’Connor, Krunal Patel, Michelle O’Toole, Eric Adles, The Johns Hopkins University Applied Physics Laboratory
Alternate
1. A Multi-Platform Clock Ensemble Testbed
       
Christopher Flood, Justin Pedersen, Penina Axelrad, University of Colorado Boulder
PTTI Session P3b
 

Session Chairs:

Dr. Per Olof Hedekvist
RISE Research Institutes of Sweden

1. Optical Time & Frequency Activities in the GÉANT Project (Past & Future)
       
Josef Vojtech, Vladimir Smotlacha, CESNET; Susanne Naegele-Jackson, Friedrich-Alexander Universität Erlangen- Nürnberg; Nicolas Quintin, RENATER; Krzysztof Turza, Wojbor Bogacki, Poznan Supercomputing and Networking Center; Guy Roberts, GÉANT; Fabian Mauchle, Joel Busch, SWITCH
2. Entirely Terrestrial Time Distribution From Standards Institutes To Industry
   
Richard Hoptroff, Hoptroff London
3. CLONETS-DS – Clock Network Services-Design Study Strategy and Innovation for Clock Services Over Optical-Fibre Networks
   
Wojbor Bogacki, Artur Binczewski, Krzysztof Turza, Poznan Supercomputing and Networking Center; Vincenzo Capone, Tryfon Chiotis, Guy Roberts, Domenico Vicinanza, GÉANT VERENIGING; Harald Schnatz, Tara Cubel Liebisch, Physikalisch-Technische Bundesanstalt; Paul-Eric Pottie, Philip Tuckey, LNE-SYRTE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC; Davide Calonico, Cecilia Clivati, Istituto Nazionale di Ricerca Metrologica; Lada Altmannova, Vladimir Smotlacha, Radek Velc, Rudolf Vohnout, Josef Vojtech, CESNET; Ronald Holzwarth, Benjamin Sprenger, Menlo Systems; Ondrej Cíp, Lenka Pravdová, Simon Rerucha, Institute of Scientific Instruments of the CAS, v.v.i. (ISI); Javier Díaz Alonso, Eduardo Ros Vidal, University of Granada; Benoit Rat, Orolia; Jan Kodet, Ulrich Schreiber, Technical University of Munich; Jürgen Kusche, Dieter Meschede, Stefan Schröder, Simon Stellmer, Rheinische Friedrich-Wilhelms-Universität Bonn; Pawel Nogas, Robert Urbaniak, Piktime Systems sp. z o.o.; Przemyslaw Krehlik, Lukasz Sliwczynski, AGH University of Science and Technology; Anne Amy-Klein, Christian Chardonnet, LPL, Université Sorbonne Paris Nord, CNRS; Nicolas Quintin, Réseau National de Télécommunications pour la Technologie, l'Enseignement et la Recherche; Alwyn Seeds, University College London; Bruno Desruelle, Jean Lautier-Gaud, Vincent Ménoret, Martin Rabault, iXblue
4. Experience with Time Transfer in the Optical Infrastructure CITAF
       
Vladimir Smotlacha, Josef Vojtech, CESNET

Thursday Sessions

PTTI Session P4a
 

Session Chairs:

Dr. Kari Moran
NIWC Pacific
Dr. Zachary Warren
The Aerospace Corporation

1. A Network Time Server Based on FPGA Hardware
   
Felix Vietmeyer, JILA, University of Colorado; Judah Levine, JILA, University of Colorado And Time and Frequency Division, NIST Boulder
2. The NIST Fiber-Based Time Service
   
Judah Levine, Time and Frequency Division NIST Boulder
3. Time Transfer using High-Definition Television (HDTV) Broadcast Transmitters in Common View
       
Konstantin Tarasov, Bethany Bauer, Sebastian Olsen, Eugene Grayver, Howard Feil, Aerospace Corporation; Jeffrey Sherman, Aidan Montare, Matt Deutch, Glenn Nelson, Michael Lombardi, National Institute of Standards & Technology; Timothy Marczewski, David Howe, National Institute of Standards & Technology & University of Colorado, Department of Physics
4. Wireless Precision Time Synchronization Alternatives and Performance
       
Ganesh Basawapatna, Joshua White and Phillip Van Hooser, Riverside Research Institute
Alternate
1. A Novel Method to Transfer Time Using the Terrestrial Timing System
   
Sameet Deshpande, Arun Raghupathy and Payam Dehghani Rahimzadeh, NextNav Inc.
PTTI Session P4b
 

Session Chairs:

Dr. Giancarlo Cerretto
INRIM
Roger Brown
NIST

1. Clock Development Activities at the U.S. Naval Observatory
       
T. G. Akin, Bryan Hemingway, Steven Peil, Precise Time Department, US Naval Observatory; J. D. Whalen, Computational Physics Inc.
2. Consideration of Thermal-Beam Calcium Clocks for Timing Applications

Steven Peil, Thomas G. Akin, Joseph Whalen, United States Naval Observatory
3. NIST-F3, a Cesium Fountain Frequency Reference
       
Gregory W. Hoth, Jeff A. Sherman, National Institute of Standards and Technology; Alexander G. Radnaev, Peter Mitchell, Infleqtion; Vladislav Gerginov, National Institute of Standards and Technology and University of Colorado Boulder
4. Time and Frequency Over Optical Networks, Results from European Metrology Project TiFOON
   
Per Olof Hedekvist, RISE Research Institute of Technology; Josef Vojtech, CESNET; Jochen Kronjäger, Physikalisch-Technische Bundesanstalt; Peter Whibberley, National Physical Laboratory; Davide Calonico, Istituto Nazionale di Ricerca Metrologica; Jacques Morel, Eidgenössisches Institut für Metrologie (METAS); Erik Dierikx, VSL – Nederlands Metrologisch Instituut; Krzysztof Turza, Poznan Supercomputing and Networking Center; Paul-Eric Pottie, LNE-SYRTE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC; Ondejíp, Institute of Scientific Instruments of the CAS, v.v.i. (ISI); Ulrich Schreiber, Technical University of Munich; Przemysaw Krehlik, AGH University of Science and Technology; Anne Amy-Klein, LPL, Université Sorbonne Paris Nord, CNRS; Jean Lautier-Gaud, iXblue; Vittori Curri, Politechnico di Torino
Alternate
1. Common-View Multi-Constellation GNSS Time Transfer, with and Without Time-Interval Counters
   
Aidan Montare, Jeff Sherman, Michael Lombardi, National Institute of Standards and Technology
Virtual Presentations
Incorporation of an Optical Lattice Clock in Steering UTC(NICT)
   
T. Ido, H. Hachisu, N. Nemitz, H. Ito, N. Ohtsubo, Y. Miyauchi, M. Morikawa and K. Matsubara, National Institute of Information and Communications Technology
Progress Reports on the Yb Optical Lattice Clock NMIJ-Yb1 for Contributing to International Atomic Time
   
T. Kobayashi, National Metrology Institute of Japan; D. Akamatsu, National Metrology Institute of Japan & Yokohama National University; K. Hosaka, Yokohama National University; Y. Hisai}, Yokohama National University; A. Nishiyama, A. Kawasaki, M. Wada, H. Inaba, T. Tanabe, National Metrology Institute of Japan; F.-L. Hong, Yokohama National University; M. Yasuda, National Metrology Institute of Japan
PTTI Session P5a
 

Session Chairs:

Dr. Daphna Enzer
Jet Propulsion Laboratory

1. Measurement of Transient Environmental Effects in GPS-Disciplined Clocks
       
Andrew Novick, Michael A. Lombardi, Time and Frequency Division, National Institute of Standards and Technology; Demetrios Matsakis, and John Clark, Masterclock, Inc.
2. Development of Laser-Optical Clocks for Future QZSS and Experimental Evaluation of a Seven-Satellite Constellation
       
Saya Matsushita, Hiroshi Takiguchi, Toshitaka Sasaki, Aru Suemasa, Hideki Narita, Hideki Yamada, Kyohei Akiyama, Isao Kawano, Satoshi Kogure, Japan Aerospace Exploration Agency; Takashi Tsuruta, Space Engineering Development Co., Ltd,; Yuichi Takeuchi, Mitsuru Musha, The University of Electro-Communications
3. On Error Modeling in GNSS-based Frequency Transfer: Effects of Temperature Variations and Satellite Orbit Repeat Times
       
Ahmed Elmaghraby, Thomas Krawinkel, Steffen Schön, Leibniz University Hannover, Institut für Erdmessung; Dirk Piester, Andreas Bauch, Physikalisch-Technische Bundesanstalt
4. Sub-Microsecond Holdover Timing Capabilities of the Miniature Atomic Clock (MAC) Rubidium Oscillator
       
Will Krzewick, John Bollettiero, Jay Noble, Peter Cash, Igor Kosvin, Microchip Technologies
Virtual Presentations
Effects of Solar Flare Activity on GPS Satellite Timing Sources
       
Edith Szarkowski, Johns Hopkins University
PPP Time and Frequency Transfer Independent of Time-varying Receiver Biases
   
Xiaolong Mi, Ahmed El-Mowafy, School of Earth and Planetary Sciences, Curtin University, Perth, Australia; Baocheng Zhang, State Key Laboratory of Geodesy and Earth’s Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences (CAS); Kan Wang: National Time Service Center, CAS, University of Chinese Academy of Sciences; Teng Liu, Yunbin Yuan: State Key Laboratory of Geodesy and Earth’s Dynamics, Innovation Academy for Precision Measurement Science and Technology, CAS
PTTI Session P5b
 

Session Chairs:

Dr. Michael Coleman
Naval Research Laboratory

1. An Analysis of the Steering Procedure Applied to Calculate TAI/UTC
   
Giulio Tagliaferro, Gianna Panfilo, BIPM Time Department
2. A Robust Time Scale Based on Maximum Likelihood Estimation
       
Hamish McPhee, Jean-Yves Tourneret, University of Toulouse, ENSEEIHT-IRIT-TéSA; David Valat, CNES; Philippe Paimblanc, TéSA; David Valat, Jérome Delporte, Yoan Grégoire, CNES
3. Fast and Reliable Forecasting for Satellite Clock Bias Correction with Transformer Deep Learning
       
Wahyudin P. Syam, Shishir Priyadarshi, Andrés Abelardo García Roqué, Alejandro Pérez Conesa, GMV; Guillaume Buscarlet, Mickael Dall’ Orso, European Space Agency (ESA)
4. Jitterbug: Portable COTS Timing Measurement System for Clock Analysis and Timing Applications
   
Wil Myrick and Charlie Vines, ENSCO
Alternate
1. Common Calendar Timestamp System
       
Brooks Harris, EdlMax LLC
Virtual Presentations
Detecting Manipulated Spaceborne Positioning and Timing Using Ground-Based Commercial-Off-The-Shelf Assets and Services
       
Son VoBa, Sync-n-Scale