Results 121 to 130 of about 3,196 (215)

The impact of tropospheric delay towards the accuracy of GPS height determination [PDF]

, 2007
When Global Positioning System (GPS) satellite signals propagates through the earth’s neutral atmosphere, the radio signals are affected significantly by the variability of its refractive index, which causes primarily in the delay of the arrival, usually
Kamaruddin, Md. Nor, Yahya, Mohd. Hafiz
core  

Estimation of residual tropospheric delay for high-altitude vehicles: towards precise positioning of a stratospheric airship

, 2000
GPS can play an important role in high-altitude vehicle positioning. In such GPS applications, the residual tropospheric delay in GPS measurements is a major error source. Several strategies for estimating the residual zenith tropospheric delay have been
Tsujii, T, Wang, J ; https://orcid.org/, Inagaki, T, Harigae, M, Rizos, C ; https://orcid.org/   +4 more
core   +1 more source

Optimized GNSS tropospheric delay model for high-precision dam deformation monitoring in large height difference environments

Array
Tropospheric delay is a critical error in Global Navigation Satellite System (GNSS) high-precision positioning, particularly in dam deformation monitoring requiring millimeter-level accuracy.
Yan Chen, Xingyu Zhou, Xiaowu Hu, Xuexi Liu, Zhuoni Jin, Jiayan Shen, Mingyuan Zhang, Jie Wang   +7 more
doaj   +1 more source

Zenith Tropospheric Delay Forecasting in the European Region Using the Informer–Long Short-Term Memory Networks Hybrid Prediction Model

Atmosphere
Zenith tropospheric delay (ZTD) is a significant atmospheric error that impacts the Global Navigation Satellite System (GNSS). Developing a high-precision, long-term forecasting model for ZTD can provide valuable insights into the overall trends of ...
Zhengdao Yuan, Xu Lin, Yashi Xu, Jie Zhao, Nage Du, Xiaolong Cai, Mengkui Li   +6 more
doaj   +1 more source

Comparison of tropospheric delay modeling approaches in VLBI analysis [PDF]

In VLBI analysis, the tropospheric signal delay is modeled using so-called mapping functions and gradients. They relate a delay in zenith direction to the delay at the elevation and azimuth at which an observation takes place.
Baldreich, Leo
core   +1 more source

An optimized BP neural network for modeling zenith tropospheric delay in the Chinese mainland using coupled particle swarm and genetic algorithm

Geo-spatial Information Science
Tropospheric delay influences high-precision navigation positioning and precipitable water vapor retrieval with the Global Navigation Satellite System (GNSS).
Liangke Huang, Haohang Bi, Hongxing Zhang, Shitai Wang, Fasheng Liao, Lilong Liu, Weiping Jiang   +6 more
doaj   +1 more source

Propagation Effects for Satellite Mounted Radars and Remote Sensing by Active Microwave SAR Sensors for Frequencies of X-band up to Ka-band

, 2011
Since the development of microwave sensors using higher frequency bands is topical and on the agenda of several space agencies, there is an actual demand to further investigate tropospheric propagation effects and related issues in more detail.
Chandra, Madhu, Danklmayer, Andreas
core  

A Study on Wet Tropospheric Delay Error Estimation for the Navigation Signals over Indian Region

656-669The present work deals with the wet tropospheric delay estimation using the different models for navigation signals over the Indian region. Results from various mathematical models are analysed for saturation vapour pressure, partial vapour ...
Srivastava, Ashutosh
core   +1 more source

Tropospheric delay corrections to differential InSAR results from GPS observations

, 2003
Differential Interferometric Synthetic Aperture Radar (DInSAR) techniques have been recognised as well-suited for ground deformation monitoring applications. However, the spatially and temporally variable delay of the radar signal propagating through the
Ge, L (15499082), Rizos, C (15475967), Janssen, V (15499079)   +2 more
core  

Simplification of Mapping Function For Global Positioning System (GPS)Tropospheric Delay [PDF]

, 2010
The mathematical modeling on the mapping function models should be revised and also simplified to improve the calculation of the GPS tropospheric delay.
Sakidin, Hamzah, Tay, Choo Chuan
core