Publications

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Satellite Navigation, GPS (Global Positioning System) and GNSS (Global Navigation Satellite System)

2019

Enhancement of Augmentation Signal Availability by SBAS Implementation with the QZSS Constellation
T. Sakai, M. Kitamura, and T. Aso, ION Pacific PNT, Honolulu, HI, April 2019 PDF

2018

The IGSO SBAS: Signal Availability in the Polar Regions
T. Sakai, M. Kitamura, and T. Aso, European Navigation Conference (ENC), Gotenburg, Sweden, May 2018 PPT

DFMC SBAS: Augmentation Service from the Zenith
T. Sakai, Munich Satellite Navigation Summit, Munich, Germany, March 2018 PPT

DFMC SBAS: Experiments and Potential Applications
T. Sakai, International Committee on GNSS (ICG) APP-SG, Munich, Germany, March 2018 PPT

Development of DFMC SBAS Prototype System using L1 and L5 Band Signals of GPS, Galileo, and QZSS
M. Kitamura, T. Aso, T. Sakai, and K. Hoshinoo, Proc. ION 2018 International Technical Meeting, pp.353-364 Reston, VA, Jan. 2018

Avoiding Improper Modeling in SBAS Ionospheric Correction with Shrunk Observations
T. Sakai, M. Kitamura, T. Aso, and K. Hoshinoo, Proc. ION 2018 International Technical Meeting, pp.393-401, Reston, VA, Jan. 2018 PPT

2017

The Status of Dual-Frequency Multi-Constellation SBAS Trial by Japan
T. Sakai, International Symposium on GNSS, Hong Kong, China, Dec. 2017 PPT PDF

SBAS Ionospheric Correction with Minimalization of the Ionospheric Threat
T. Sakai, M. Kitamura, T. Aso, and K. Hoshinoo, Proc. ION 2017 International Technical Meeting, pp.1049-1056, Monterey, CA, Jan. 2017 PPT

2016

Japanese SBAS Program: Current Status and Dual-Frequency Trial
T. Sakai, International Symposium on GNSS, Tainan, Taiwan, Dec. 2016 PPT PDF

Expanding the Coverage of Local Area Differential Correction
T. Sakai, T. Aso, M. Kitamura, K. Hoshinoo, and K. Ito, Proc. ION 2016 International Technical Meeting, pp.624-630, Monterey, CA, Jan. 2016 PPT

2015

Quality Control of Ionospheric Corrections for Adoption of Wide Area Augmentation at the Low Latitude Regions
T. Sakai, T. Aso, K. Hoshinoo, and K. Ito, Proc. ION 2015 International Technical Meeting, Dana Point, CA, Jan. 2015 PPT

2014

East Asia - The Region with the Densest SBAS Augmentation
T. Sakai, International Committee on GNSS (ICG) APP-SG, Jeju, South Korea, Oct. 2014 PPT

MSAS Status
T. Sakai, International Symposium on GNSS 2014, Jeju, South Korea, Oct. 2014 PPT

SBAS Satellite Selection and Performance Monitoring at the Region Where Multiple SBAS are Available
T. Sakai, K. Hoshinoo, and K. Ito, Proc. ION GNSS+ 2014, Tampa, FL, Sept. 2014 PPT

2013

Dual Frequency SBAS Trial and Preliminary Results for East-Asia Region
T. Sakai and K. Hoshinoo, Proc. ION GNSS+ 2013, Nashville, TN, Sept. 2013 PPT

2012

Expanding SBAS Service Area Toward the Southern Hemisphere
T. Sakai, K. Hoshinoo, and K. Ito, Proc. ION GNSS 2012, Nashville, TN, Sept. 2012

GPS/GLONASS Multi-Constellation SBAS Trial and Preliminary Results for East-Asia Region
T. Sakai, H. Yamada, and K. Hoshinoo, Proc. ION GNSS 2012, Nashville, TN, Sept. 2012 PPT

2011

Validity of RAIM Prediction
T. Sakai, Proc. ION 2011 International Technical Meeting, pp. 258-270, San Diego, CA, Jan. 2011 PPT

2010

Computing SBAS Protection Levels with Consideration of All Active Messages
T. Sakai, K. Matsunaga, K. Hoshinoo, and T. Walter, Proc. ION GNSS 2010, pp. 2042-2050, Portland, OR, Sept. 2010 PPT

2009

Modeling Vertical Structure of Ionosphere for SBAS
T. Sakai, T. Yoshihara, S. Saito, K. Matsunaga, K. Hoshinoo, and T. Walter, Proc. ION GNSS 2009, pp. 1257-1267, Savannah, GA, Sept. 2009 PPT

2008

Modeling Ionospheric Spatial Threat Based on Dense Observation Datasets for MSAS
T. Sakai, K. Matsunaga, K. Hoshinoo, and T. Walter, Proc. ION GNSS 2008, Savannah, GA, Sept. 2008 PPT

2007

Mitigating Ionospheric Threat Using a Dense Monitoring Network
T. Sakai, K. Matsunaga, K. Hoshinoo, K. Ito, and T. Walter, Proc. ION GNSS 2007, pp. 927-938, Fort Worth, TX, Sept. 2007 PPT

2006

Performance Requirement of Velocity Estimation for Airborne-based Downward-looking GPS Occultation
T. Yoshihara, N. Fujii, S. Saitoh, T. Sakai, K. Hoshinoo, K. Matsunaga, T. Tsuda, and Y. Aoyama, Proc. ION GNSS 2006, pp. 653-661, Fort Worth, TX, Sept. 2006

Implementation of Prototype Satellite-Based Augmentation System (SBAS)
T. Sakai, S. Fukushima, N. Arai, and K. Ito, IGNSS 2006, Gold Coast, Australia, July 2006

Prototype of Satellite-Based Augmentation System and Evaluation of the Ionospheric Correction Algorithms
T. Sakai, K. Matsunaga, K. Hoshinoo, and T. Walter, Proc. ION 2006 National Technical Meeting, pp. 368-379, Monterey, CA, Jan. 2006 PDF PPT

A Study on Detection of Sea Level Variation Using GPS Signal Reflected by Sea Surface
T. Yoshihara, S. Saito, N. Fujii, and T. Sakai, Proc. ION 2006 National Technical Meeting, pp. 217-223, Monterey, CA, Jan. 2006

2005

Measurement System of Airborne-Based GPS Down-Looking Occultation and Experimental Results
T. Yoshihara, N. Fujii, K. Hoshinoo, K. Matsunaga, S. Saitoh, T. Sakai, T. Tsuda, Y. Aoyama, and S. Danno, URSI 28th General Assembly, India, Oct. 2005

Relationship between Barometric Altitude and GPS-Based Height
T. Sakai, ICAO SCRSP/WG-B, Paris, France, WP/B/9-30, Oct. 2005 PDF

Modified Ionospheric Correction Algorithm for the SBAS Based on Geometry Monitor Concept
T. Sakai, K. Matsunaga, K. Hoshinoo, and T. Walter, Proc. ION GNSS 2005, pp. 735-747, Long Beach, CA, Sept. 2005 PDF

Measurement System and Experimental Results of Airborne-based Downward-looking GPS Occultation
T. Yoshihara, N. Fujii, K. Hoshinoo, K. Matsunaga, S. Saitoh, T. Sakai, T. Tsuda, Y. Aoyama, and S. Danno, Proc. ION GNSS 2005, pp. 290-297, Long Beach, CA, Sept. 2005

Improving Availability of Ionospheric Corrections in the Low Magnetic Latitude Region
T. Sakai, K. Matsunaga, K. Hoshinoo, and T. Walter, Proc. ION 2005 National Technical Meeting, pp. 569-579, San Diego, CA, Jan. 2005 PDF

An Investigation of Local-Scale Spatial Gradient of Ionospheric Delay Using the Nation-Wide GPS Network Data in Japan
T. Yoshihara, T. Sakai, N. Fujii, and A. Saitoh, Proc. ION 2005 National Technical Meeting, pp. 725-734, San Diego, CA, Jan. 2005

2004

Evaluating Ionospheric Effects on SBAS in the Low Magnetic Latitude Region
T. Sakai, K. Matsunaga, K. Hoshinoo, and T. Walter, Proc. ION GNSS 2004, pp. 1318-1328, Long Beach, CA, Sept. 2004 PDF

Airborne GPS Down-Looking Occultation Experiments
T. Yoshihara, N. Fujii, K. Hoshinoo, K. Matsunaga, S. Saitoh, T. Sakai, T. Tsuda, Y. Aoyama, and S. Danno, Proc. ION GNSS 2004, pp. 1713-1723, Long Beach, CA, Sept. 2004

Correlation Structure of the Equatorial Ionosphere
S. Rajagopal, T. Walter, S. Datta-Barua, J. Blanch, and T. Sakai, Proc. ION 2004 National Technical Meeting, pp.542-550, San Diego, CA, Jan. 2004

2003

Experimental GBAS Performance at the Approach Phase
S. Saitoh, S. Fukushima, T. Yoshihara, and N. Fujii, Proc. ION 2003 National Technical Meeting, pp. 317-325, Anaheim, CA, Jan. 2003

2001

Flight Experiment of GBAS in Japan
S. Saitoh, S. Fukusima, and N. Fujii, Proc. ION GPS 2001, pp. 1757-1765, Salt Lake City, UT, Sept. 2001

2000

Extended Availability and Continuity Computation Method to GPS Augmentations for Approach and Landing
T. Sakai and K. Koremura, Proc. 2000 National Technical Meeting, pp. 408-417, Anaheim, CA, Jan. 2000


Quasi-Zenith Satellite System (QZSS)

2019

The latest status of Quasi-Zenith Satellite System (QZSS) and its future expansion
T. Sakai and S. Kogure, Proc. ION GNSS+ 2019, Miami, FL, Sept. 2019 PDF

2018

QZSS Update
T. Sakai and S. Kogure, Proc. ION GNSS+ 2018, Miami, FL, Sept. 2018 PDF

Evaluation of Quasi-Zenith Satellite System L5S Signal
Chiu-Mei Wu, Shau-Shiun Jan, and Takeyasu Sakai, Proc. ION 2018 International Technical Meeting, pp.339-352, Reston, VA, Jan. 2018

2017

The Experiment on DFMC SBAS via QZSS L5S Signal
T. Sakai, International Committee on GNSS (ICG) WG-B, Kyoto, Japan, Dec. 2017 PPT

DFMC SBAS Trial with QZSS L5S Signal
T. Sakai, Multi-GNSS Asia Conference (MGA/9), Jakarta, Indonesia, Oct. 2017 PPT

Japan: The Latest Update on Quasi-Zenith Satellite System (QZSS) Program
S. Kogure, H. Moriyama, A. Matsumoto, S. Sakabe, T. Sato, K. Nakaitani, H. Emura, J. Awano, M. Miyoshi, K. Yoshikawa, and T. Sakai, Proc. ION Pacific PNT Meeting, Honolulu, HI, May 2017 PPT

Status of Japanese QZSS and SBAS Programs
T. Sakai, APEC GNSS Implementation Team (GIT), Chinese Taipei, April 2017 PPT

2016

Test of QZSS L1-SAIF Based on the MADOCA Real-Time Products
T. Sakai, K. Satoh, and Y. Wakabayashi, Multi-GNSS Asia Conference (MGA/8), Manila, Philippines, Nov. 2016 PPT

Status of the Japanese QZSS Program
T. Sakai, Munich Satellite Navigation Summit, Munich, Germany, March 2016 PPT

2015

Generation of the QZSS L1-SAIF Message from the MADOCA Realtime Products
T. Sakai and S. Kogure, Proc. ION Pacific PNT Meeting, Honolulu, HI, April 2015 PPT

2014

Ionospheric Correction at the Southwestern Islands for the QZSS L1-SAIF
T. Sakai, K. Hoshinoo, and K. Ito, Proc. ION 2014 International Technical Meeting, San Diego, CA, Jan. 2014 PPT

2013

GPS/GLONASS/QZSS Multi-GNSS Augmentation Trial by L1-SAIF Signal
T. Sakai, 5th Asia Oceania Regional Workshop on GNSS, Hanoi, Vietnam, Dec. 2013 PPT

QZSS L1-SAIF Supporting GPS/GLONASS Multi-Constellation Augmentation
T. Sakai, H. Yamada, K. Hoshinoo, and K. Ito, Proc. ION 2013 International Technical Meeting, San Diego, CA, Jan. 2013 PPT

2012

Multi-GNSS Augmentation by L1-SAIF Signal: Preliminary Results
T. Sakai, 4th Asia Oceania Regional Workshop on GNSS, Kuala Lumpur, Malaysia, Dec. 2012 PPT

The L1-SAIF Signal: How was it designed to be used?
T. Sakai, Proc. ION GNSS 2012, Nashville, TN, Sept. 2012 PPT

Real-time Simulation of QZSS Regional Satellite Navigation
H. Yamada, S. Fujita, S. Saitoh, T. Sakai, and K. Ito, Proc. ION GNSS 2012, Nashville, TN, Sept. 2012

Ranging Quality of QZSS L1-SAIF Signal
T. Sakai, H. Yamada, and K. Ito, Proc. ION 2012 International Technical Meeting, Newport Beach, CA, Jan. 2012 PPT

Regional Satellite Navigation by Using MSAS and QZSS
H. Yamada, T. Sakai, and K. Ito, Proc. ION 2012 International Technical Meeting, Newport Beach, CA, Jan. 2012

2011

QZSS Observation Data Available to the Public
T. Sakai, 3rd Asia-Oceania Regional Workshop on GNSS, Jeju Island, South Korea, Nov. 2011 PPT

Generation and Evaluation of QZSS L1-SAIF Ephemeris Information
T. Sakai, H. Yamada, S. Fukushima, and K. Ito, Proc. ION GNSS 2011, Portland, OR, Sept. 2011 PPT

QZSS L1-SAIF Initial Experiment Results
T. Sakai, S. Fukushima, and K. Ito, Proc. ION 2011 International Technical Meeting, pp. 1133-1142, San Diego, CA, Jan. 2011 PPT

2010

Development of QZSS L1-SAIF Augmentation Signal
T. Sakai, S. Fukushima, and K. Ito, The 2nd ENRI International Workshop on CNS/ATM (EIWAC/2), Tokyo, Nov. 2010 PPT

Recent Development of QZSS L1-SAIF Master Station
T. Sakai, S. Fukushima, and K. Ito, Proc. ION 2010 International Technical Meeting, pp. 354-364, San Diego, CA, Jan. 2010 PPT

2009

Ionospheric and Tropospheric Correction Processors for SBAS and QZSS L1-SAIF
T. Sakai, S. Fukushima, and K. Ito, Proc. ION 2009 International Technical Meeting, pp. 312-323, Anaheim, CA, Jan. 2009 PPT

2008

Implementation of the QZSS L1-SAIF Message Generator
T. Sakai, S. Fukushima, N. Takeichi, and K. Ito, Proc. ION 2008 National Technical Meeting, pp. 464-476, San Diego, CA, Jan. 2008 PPT

2007

Tropospheric Delay Correction for the Augmentation System using Quasi-Zenith Satellite System
N. Takeichi, T. Sakai, S. Fukushima, and K. Ito, IEICE WSANE 2007, Perth, Australia, April 2007

Augmentation Performance of QZSS L1-SAIF Signal
T. Sakai, S. Fukushima, N. Takeichi, and K. Ito, Proc. ION 2007 National Technical Meeting, pp. 411-421, San Diego, CA, Jan. 2007 PDF PPT

2006

Quasi-Real-Time Signal Delay Estimation of Remote Synchronization System for Onboard Crystal Oscillators
N. Takasaki, A. Iwasaki, T. Iwata, M. Imae, T. Suzuyama, F. Tappero, H. Murakami, N. Arai, T. Sakai, S. Fukushima, and K. Ito, International Symposium on Space Technology and Science, Kanazawa, Japan, June 2006


Copyright (C) 2007-2012, ENRI - For comments or suggestion, please contact: sakai@enri.go.jp