Results 41 to 50 of about 32,348,343 (303)
Research on the pricing of PPP project ABS products based on the right of income of heating
Frontiers in Energy Research, 2023 Introduction: The Public-Private Partnership (PPP) model has the advantages of enhancing the efficiency of social infrastructure construction and reducing the risk of government liabilities, and has been widely used and developed in China. In the current
Zheng Duan, Yifan Zhang
doaj +1 more source
, 2016 In recent years, due to the increase in providers of orbit and clock corrections of satellites for data evaluation in real-time and post-processing the method of Precise Point Positioning (PPP) using measurements of Global Navigation Satellite System ...
T. Öcalan +3 more
semanticscholar +1 more source
Introduction of the Double-Differenced Ambiguity Resolution into Precise Point Positioning
Remote Sensing, 2018 According to the advantages of the precise point positioning (PPP) and the double-differenced (DD) model based algorithm, a new method for the integration of DD integer ambiguity resolution into PPP is presented.
Haojun Li +4 more
doaj +1 more source
Remote Sensing, 2020 The determination of slant total electron content (STEC) between satellites and receivers is the first step for establishing an ionospheric model. However, the leveling errors, caused by the smoothed ambiguity solutions in the carrier-to-code leveling ...
Jin Wang +5 more
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Precise Point Positioning with Partial Ambiguity Fixing
Sensors, 2015 Reliable and rapid ambiguity resolution (AR) is the key to fast precise point positioning (PPP). We propose a modified partial ambiguity resolution (PAR) method, in which an elevation and standard deviation criterion are first used to remove the low ...
Pan Li, Xiaohong Zhang
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Time-Domain Evaluation Method for Clock Frequency Stability Based on Precise Point Positioning
IEEE Access, 2019 The Global Navigation Satellite System (GNSS) and GNSS receivers can be used to measure the time-frequency errors of receiver clocks so as to evaluate their frequency stability. The calculation of receiver clock error by single point positioning (SPP) is
Yang Lei +4 more
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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 +6 more
wiley +1 more source
, 2016 The results of development and testing of new PPP-method realization (Precise Point Positioning) for high-precision determination of Low Earth Orbit satellites (LEOS) trajectory parameters using the results of on-board GPS-observations and kinematic ...
Alexey Zhalilo, A. Yakovchenko
semanticscholar +1 more source
Remote Sensing, 2018 Integer ambiguity resolution (IAR) is important for rapid initialization of precise point positioning (PPP). Whereas many studies have been limited to Global Positioning System (GPS) alone, there is a strong need to add Globalnaya Navigatsionnaya ...
Yanyan Liu, Shengfeng Gu, Qingquan Li
doaj +1 more source
Understanding the Decisive Causes of PPP Project Disputes in China
Buildings, 2021 Disputes are inevitable in public-private partnership (PPP) projects and generate great losses of time and money in practice. If an in-depth understanding of dispute sources can be obtained beforehand, the process of PPP may become more smooth.
Xiaoxiao Zheng +4 more
doaj +1 more source