Regional ionospheric corrections for high accuracy GNSS positioning

T Dao, K Harima, B Carter, J Currie, S McClusky… - Remote Sensing, 2022 - mdpi.com
Centimetre-level accurate ionospheric corrections are required for a high accuracy and rapid
convergence of Precise Point Positioning (PPP) GNSS positioning solutions. This research …

Assessing the performance of multi-frequency GPS, Galileo and BeiDou PPP ambiguity resolution

V Duong, K Harima, S Choy… - Journal of Spatial …, 2020 - Taylor & Francis
The authors investigate the benefits for the precise point positioning (PPP) ambiguity resolution
technique of using the GPS L1, L2 and L5; Galileo E1, E5a, E5b and E6; and BeiDou B1, …

Instantaneous best integer equivariant position estimation using Google Pixel 4 smartphones for single-and dual-frequency, multi-GNSS short-baseline RTK

CZ Yong, K Harima, E Rubinov, S McClusky… - Sensors, 2022 - mdpi.com
High-precision global navigation satellite system (GNSS) positioning and navigation can be
achieved with carrier-phase ambiguity resolution when the integer least squares (ILS) …

GPS precise point positioning with the Japanese Quasi-Zenith Satellite System LEX augmentation corrections

S Choy, K Harima, Y Li, M Choudhury… - The Journal of …, 2015 - cambridge.org
The Japanese Quasi-Zenith Satellite System (QZSS) is a regional satellite navigation system
capable of transmitting navigation signals that are compatible and interoperable with other …

An optimal linear combination model to accelerate PPP convergence using multi-frequency multi-GNSS measurements

V Duong, K Harima, S Choy, D Laurichesse, C Rizos - GPS Solutions, 2019 - Springer
We propose an optimal ionospheric-free linear combination (LC) model for dual- and triple-frequency
PPP which can accelerate carrier phase ambiguity and decrease the position …

The ionospheric effects of the 2022 Hunga Tonga Volcano eruption and the associated impacts on GPS Precise Point Positioning across the Australian region

…, P Wilkinson, P Maher, R Marshall, K Harima… - Space …, 2023 - Wiley Online Library
The Hunga Tonga Volcano eruption launched a myriad of atmospheric waves that have
been observed to travel around the world several times. These waves generated traveling …

An investigation into the performance of real-time GPS+ GLONASS Precise Point Positioning (PPP) in New Zealand

K Harima, S Choy, C Rizos, S Kogure - Journal of Applied Geodesy, 2017 - degruyter.com
This paper presents an investigation into the performance of real-time Global Navigation
Satellite Systems (GNSS) Precise Point Positioning (PPP) in New Zealand. The motivation of …

GNSS best integer equivariant estimation using multivariant t-distribution: a case study for precise point positioning

V Duong, K Harima, S Choy, C Rizos - Journal of Geodesy, 2021 - Springer
A key prerequisite for fast and reliable solution convergence time in precise point positioning
with ambiguity resolution is the successful determination of the initial integer ambiguity …

Navigation message demodulation for GPS receiver on-board spinning rockets

K Harima, H Saito, T Ebinuma - GPS solutions, 2012 - Springer
We describe a demodulation scheme for the navigation message of GPS receivers on spin-stabilized
rockets. Doppler frequencies due to fast and complex dynamics, in particular high-…

Satellite delivery of high-accuracy GNSS precise point positioning service: an overview for Australia

S Choy, K Harima - Journal of Spatial Science, 2019 - Taylor & Francis
We present an overview of satellite delivery of GNSS precise corrections in support of
Australia’s planned National Positioning Infrastructure (NPI) capability. Specifically, we describe …