Zobrazeno 1 - 10
of 29
pro vyhledávání: '"Lewen Zhao"'
Publikováno v:
Remote Sensing, Vol 16, Iss 8, p 1434 (2024)
Precise Point Positioning (PPP), coupled with the ambiguity resolution (AR) method, has demonstrated substantial potential in fields like agricultural navigation and airborne mapping. However, there remains a notable deficiency in the comprehensive c
Externí odkaz:
https://doaj.org/article/fa1f59ccbd044c41bf22149123f9b666
Publikováno v:
Atmosphere, Vol 14, Iss 1, p 46 (2022)
The water vapor content in the atmosphere is highly correlated with rainfall events, which can be used as a data source for rainfall prediction or drought monitoring. The GNSS PPP (Precise Point Positioning) technique can be used to estimate the trop
Externí odkaz:
https://doaj.org/article/ad807bc9d32c41b88f16828af7b8e1d5
Publikováno v:
Drones, Vol 6, Iss 5, p 105 (2022)
Recently, multirotor UAVs have been widely used in high-precision terrain mapping, cadastral surveys and other fields due to their low cost, flexibility, and high efficiency. Indirect georeferencing of ground control points (GCPs) is often required t
Externí odkaz:
https://doaj.org/article/4cecb41249aa46c59529903d66af1111
Autor:
Jia Song, Lewen Zhao
Publikováno v:
Applied Sciences, Vol 11, Iss 21, p 10020 (2021)
The Galileo constellations are characterized by transmitting GNSS signals on multi-frequencies, which can benefit the robustness and accuracy of the solutions. However, the dual-frequency E1/E5a combinations are generally used for precise point posit
Externí odkaz:
https://doaj.org/article/9705439bdbf449c2b517909b1aadd7cd
Publikováno v:
ISPRS International Journal of Geo-Information, Vol 10, Iss 8, p 516 (2021)
The Precise Point Positioning (PPP) with fast integer ambiguity resolution (PPP-RTK) is feasible only if the solution is augmented with precise ionospheric parameters. The vertical ionospheric delays together with the receiver hardware biases, are es
Externí odkaz:
https://doaj.org/article/a0f66676819e4beca61d4b99af3bb1e7
Publikováno v:
Remote Sensing, Vol 12, Iss 3, p 373 (2020)
The tropospheric delays estimated from the Global Navigation Satellite System (GNSS) have been proven to be an efficient product for monitoring variations of water vapor, which plays an important role in meteorology applications. The operational GNSS
Externí odkaz:
https://doaj.org/article/cb29c3e9d4cd479f8b87c5212e3cd7b3
Publikováno v:
Remote Sensing, Vol 10, Iss 2, p 232 (2018)
We developed a new strategy for a synchronous generation of real-time (RT) and near real-time (NRT) tropospheric products. It exploits the precise point positioning method with Kalman filtering and backward smoothing, both supported by real-time orbi
Externí odkaz:
https://doaj.org/article/c7dc14315b1043f898f41c0da52af0d6
Autor:
Wentong Zhang, Hongkui Yan, Wenxue Yin, Junhong Li, Ziyu Sun, Yaoyao Sun, Lewen Zhao, Yitong Zhang, Haoru Zheng
Publikováno v:
Third International Conference on Machine Learning and Computer Application (ICMLCA 2022).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::16d695c89dece3a27b7a6d11fdd80d6e
https://doi.org/10.1117/12.2675371
https://doi.org/10.1117/12.2675371
Publikováno v:
NAVIGATION. 67:275-289
To analyze the unmodeled systematic errors in BDS, a filter-assisted Partly Ensemble Empirical Mode Decomposition (PEEMD) method is combined with Hilbert spectrum analysis to extract the feature information from BDS preprocessed orbit determination r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::64cc50398fb23d878f33387ef08f081e
https://doi.org/10.1002/navi.365
https://doi.org/10.1002/navi.365
Publikováno v:
Advances in Space Research. 63:2930-2937
With the recovery of the triple-frequency clocks using satellite time-variant inter-frequency bias (TIFB) corrections, benefits of the third frequency observable on precise point positioning (PPP) have been investigated. But numerical investigations
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2822eee20cae02848318c5d1522b3833
https://doi.org/10.1016/j.asr.2018.03.004
https://doi.org/10.1016/j.asr.2018.03.004