Results 41 to 50 of about 2,070 (251)

PPP models and performances from single- to quad-frequency BDS observations

Satellite Navigation, 2020
Nowadays, China BeiDou Navigation Satellite System (BDS) has been developed well and provided global services with highly precise positioning, navigation and timing (PNT) as well as unique short-message communication, particularly global system (BDS-3 ...
Shuanggen Jin, Ke Su
doaj   +1 more source

The Bias in PPP-B2b Real-Time Clock Offset and the Strategy to Reduce It

Remote Sensing, 2022
Precise point positioning can provide accurate coordinates to users without reference stations, and the high-precision real-time clock offset product is necessary for real-time precise point positioning application.
Jinhuo Liu, Chengpan Tang, Shanshi Zhou, Xiaogong Hu, Yufei Yang, Jianhua Yang, Yuchen Liu   +6 more
doaj   +1 more source

Performance analysis of real-time and post-mission kinematic precise point positioning in marine environments

Geodesy and Geodynamics, 2020
This article focuses on the performance analysis of both real-time and post-mission kinematic precise point positioning (PPP) in challenging marine environments.
Serdar Erol, Reha Metin Alkan, İ. Murat Ozulu, Veli İlçi   +3 more
doaj   +1 more source

Kinematic precise point positioning heights enhancement using static measurements and Voronoi’s corrector surface

International Journal of Digital Earth
Recently, the use of Precise Point Positioning (PPP) has spread widely. Unlike Relative Positioning techniques, PPP uses only a single receiver unit. Although it provides sub-centimeter horizontal accuracy, the vertical accuracy of PPP is a hot topic in ...
Ahmed Al Shouny, Abdullah Kamel, Yehia Miky   +2 more
doaj   +1 more source

Noninvasive tests for nonalcoholic fatty liver disease in a multi‐ethnic population: The HELIUS study

Hepatology Communications, EarlyView., 2022
Abstract Nonalcoholic fatty liver disease (NAFLD) is increasing in prevalence and severity globally, prompting noninvasive testing, yet limited data exist on noninvasive liver tests (NITs) including transient elastography (TE) in ethnically diverse populations.
Anne‐Marieke van Dijk, Yasaman Vali, Anne Linde Mak, Henrike Galenkamp, Max Nieuwdorp, Bert‐Jan van den Born, Adriaan Georgius Holleboom   +6 more
wiley   +1 more source

Cube: An Open-Source Software for Clock Offset Estimation and Precise Point Positioning with Ambiguity Resolution

Remote Sensing
Precise point positioning (PPP) is a prevalent, high-precision spatial absolution positioning method, and its performance can be enhanced by ambiguity resolution (AR).
Shuai Liu, Yunbin Yuan, Xiaosong Guo, Kezhi Wang, Gongwei Xiao   +4 more
doaj   +1 more source

Kinematic Precise Point Positioning Using Multi-Constellation Global Navigation Satellite System (GNSS) Observations

ISPRS International Journal of Geo-Information, 2017
Multi-constellation global navigation satellite systems (GNSSs) are expected to enhance the capability of precise point positioning (PPP) by improving the positioning accuracy and reducing the convergence time because more satellites will be available ...
Xidong Yu, Jingxiang Gao
doaj   +1 more source

Multi-constellation GNSS precise point positioning with multi-frequency raw observations and dual-frequency observations of ionospheric-free linear combination

Satellite Navigation, 2020
Precise point positioning (PPP) is famous for its capability of high-precision positioning with just one station as long as the receiver can receive global navigation satellite system (GNSS) signals.
Xiangdong An, Xiaolin Meng, Weiping Jiang   +2 more
doaj   +1 more source

Application of “Galileo High Accuracy Service” on Single-Point Positioning

Sensors, 2023
Employment of precise positioning techniques will enable low-cost receivers for a variety of applications. The complexity of techniques such as Precise Point Positioning (PPP), or differential techniques that require the use of external sources of ...
Antonio Angrisano, Silvia Ascione, Giovanni Cappello, Ciro Gioia, Salvatore Gaglione   +4 more
doaj   +1 more source

Multi-Scenario Variable-State Robust Fusion Algorithm for Ranging Analysis Framework

Agriculture
Integrating modern information technology with traditional agriculture has made agricultural machinery navigation essential in PA (precision agriculture).
Kaiting Xie, Zhaoguo Zhang, Faan Wang
doaj   +1 more source