Results 11 to 20 of about 1,293 (182)

Estimation and Evaluation of Zenith Tropospheric Delay from Single and Multiple GNSS Observations

Remote Sensing, 2023
Multi-Global Navigation Satellite Systems (multi-GNSS) (including GPS, BDS, Galileo, and GLONASS) provide a significant opportunity for high-quality zenith tropospheric delay estimation and its applications in meteorology.
Sai Xia, Shuanggen Jin, Xuzhan Jin
doaj   +1 more source

Impact analysis of processing strategies for long-term GPS zenith tropospheric delay (ZTD)

Atmospheric Measurement Techniques, 2023
Abstract. Homogenized atmospheric water vapour data are an important prerequisite for climate analysis. Compared with other techniques, GPS has an inherent homogeneity advantage, but it still requires reprocessing and homogenization to eliminate impacts of applied strategy and observation environmental changes where a selection of proper processing ...
Jingna Bai, Yidong Lou, Weixing Zhang, Yaozong Zhou, Zhenyi Zhang, Chuang Shi, Jingnan Liu   +6 more
openaire   +3 more sources

4D Tropospheric Tomography using GPS Estimated Slant Delays [PDF]

, 1999
Tomographic techniques are successfully applied to obtain 4D images of the tropospheric refractivity in a local dense network. In the lower atmosphere both the small height and time scales and the non-dispersive nature of tropospheric delays require a ...
A. Flores, A. Flores, A. Flores, A. Rius, A. Rius, A. Rius, G. Ruffini, G. Ruffini, G. Ruffini   +8 more
core   +8 more sources

A Tropospheric Zenith Delay Forecasting Model Based on a Long Short-Term Memory Neural Network and Its Impact on Precise Point Positioning

Remote Sensing, 2022
Global navigation satellite system (GNSS) signals are affected by refraction when traveling through the troposphere, which result in tropospheric delay. Generally, the tropospheric delay is estimated as an unknown parameter in GNSS data processing.
Huan Zhang, Yibin Yao, Mingxian Hu, Chaoqian Xu, Xiaoning Su, Defu Che, Wenjie Peng   +6 more
doaj   +1 more source

Improving tropospheric corrections on large-scale Sentinel-1 interferograms using a machine learning approach for integration with GNSS-derived zenith total delay (ZTD) [PDF]

Remote Sensing of Environment, 2020
Abstract Sentinel-1 mission with its wide spatial coverage (250 km), short revisit time (6 days), and rapid data dissemination opened new perspectives for large-scale interferometric synthetic aperture radar (InSAR) analysis. However, the spatiotemporal changes in troposphere limits the accuracy of InSAR measurements for operational deformation ...
Roghayeh Shamshiri, Mahdi Motagh, Hossein Nahavandchi, Mahmud Haghshenas Haghighi, Mostafa Hoseini   +4 more
openaire   +2 more sources

Assessment of GNSS zenith tropospheric delay responses to atmospheric variables derived from ERA5 data over Nigeria

Satellite Navigation, 2023
Tropospheric delay is a major error caused by atmospheric refraction in Global Navigation Satellite System (GNSS) positioning. The study evaluates the potential of the European Centre for Medium-range Weather Forecast (ECMWF) Reanalysis 5 (ERA5 ...
Ifechukwu Ugochukwu Nzelibe, Herbert Tata, Timothy Oluwadare Idowu   +2 more
doaj   +1 more source

Using GNSS Observations for Tropospheric Delay Prediction Using Artificial Intelligence [PDF]

Port Said Engineering Research Journal, 2023
GNSS technology holds significant importance across wide applications, ranging from mapping, surveying, and precise timekeeping to ship navigation. Its operational principle hinges on the accurate measurement of signal travel time, which is crucial for ...
Ahmed Sedeek
doaj   +1 more source

Refining the ERA5-based global model for vertical adjustment of zenith tropospheric delay

Satellite Navigation, 2022
Tropospheric delay is an important factor affecting high precision Global Navigation Satellite System (GNSS) positioning and also the basic data for GNSS atmospheric research.
Ge Zhu, Liangke Huang, Yunzhen Yang, Junyu Li, Lv Zhou, Lilong Liu   +5 more
doaj   +1 more source

RESEARCH ON ZENITH TROPOSPHERIC DELAY MODELING OF REGIONAL CORS NETWORK [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2020
By calculating the zenith troposphere information from 11 reference stations of the CORS network in Guilin City, Guangxi Province in 2018 by GAMIT10.6 as the reference values, analyzing the relationship between the zenith troposphere and the elevation ...
Y. F. Yang, X. P. Chen, M. H. Yao, C. L. Zhou, C. M. Liao   +4 more
doaj   +1 more source

A Comprehensive Evaluation of Key Tropospheric Parameters from ERA5 and MERRA-2 Reanalysis Products Using Radiosonde Data and GNSS Measurements

Remote Sensing, 2021
Tropospheric delay is a major error source in the Global Navigation Satellite System (GNSS), and the weighted mean temperature (Tm) is a key parameter in precipitable water vapor (PWV) retrieval. Although reanalysis products like the National Centers for
Lijie Guo, Liangke Huang, Junyu Li, Lilong Liu, Ling Huang, Bolin Fu, Shaofeng Xie, Hongchang He, Chao Ren   +8 more
doaj   +1 more source