Results 161 to 170 of about 3,149 (183)

The impact of second-order ionospheric delays on the ZWD estimation with GPS and BDS measurements

GPS Solutions, 2020
Since millimeter accuracy is required in many GNSS applications such as real-time zenith wet delay (ZWD) estimation, the higher-order ionospheric delays on GNSS signals are no longer negligible. We calculated the second-order ionospheric delays ($$I_{2}$$) and analyzed the impact on the ZWD estimation with GPS-only and combined GPS/BDS observations ...
Shaocheng Zhang, Lei Fang, Guangxing Wang, Wei Li   +3 more
openaire   +2 more sources

Reducing ZHD–ZWD mutual absorption errors for blind ZTD model users

Acta Geodaetica et Geophysica, 2020
In precise point positioning (PPP), the zenith hydrostatic delay (ZHD) is traditionally treated as a priori value from the ZHD model but the zenith wet delay (ZWD) is treated as an unknown parameter to estimated. For some near real-time PPP tasks, priori ZHD from the blind ZHD models are often used because external meteorological measurement or ...
M. Ding
openaire   +2 more sources

Assimilation of Zenith Wet Delay observations using the ensemble Kalman Filter in a Poly-ZWD empirical model over the USA

Journal of Atmospheric and Solar-Terrestrial Physics
Modeling the spatial and temporal variability of water vapor in the lower atmosphere is crucial for meteorological and geodetic applications, as it directly influences weather prediction and satellite-based positioning. However, traditional empirical models often struggle to capture rapid water vapor fluctuations, limiting their accuracy and practical ...
Masoud Dehvari, Saeed Farzaneh, Ehsan Forootan   +2 more
openaire   +3 more sources

Towards zero waste discharge (ZWD) in agar production: Gracilaria dura byproduct-based activated carbon for sustainable environmental remediation

International Journal of Biological Macromolecules
Gracilaria dura; red seaweed used in agar production; generates substantial processing waste (PWs); including residual seaweed-mass (RSM) and aqueous alkaline waste (AAW). In this study; 1 kg G. dura processed for the production of 250 ± 5 g agar; 350 ± 25 g RSM and 12.5 ± 0.5 kg AAW.
Amit, Gosai, Priyanka, Jhajharia, Mayur, Dhamecha, Rudra, Chand, Subhadip, Neogi, Ramavatar, Meena   +5 more
openaire   +3 more sources

PPP-derived tropospheric ZWD augmentation from local CORS network tested on bridge monitoring points

Advances in Space Research, 2022
Xu Tang, Zhizhao Liu, Gethin Wyn Roberts, Craig Matthew Hancock   +3 more
openaire   +2 more sources

Development of a zero water discharge (ZWD)—Recirculating aquaculture system (RAS) hybrid system for super intensive white shrimp (Litopenaeus vannamei) culture under low salinity conditions and its industrial trial in commercial shrimp urban farming in Gresik, East Java, Indonesia

Aquacultural Engineering, 2018
Abstract This study aims to develop a hybrid zero water discharge (ZWD) - recirculating aquaculture system (RAS) system to improve water quality, as well as the growth, survival, and productivity, of the super-intensive white shrimp culture under low salinity conditions at semi-mass and the industrial level.
Gede Suantika, Magdalena Lenny Situmorang, Jonathan Berlian Kurniawan, Sherly Arista Pratiwi, Pingkan Aditiawati, Dea Indriani Astuti, Fahma Fiqhiyyah Nur Azizah, Yovita Astuti Djohan, Usman Zuhri, Togar Mangihut Simatupang   +9 more
openaire   +2 more sources

The impact of relative and absolute GNSS positioning strategies on estimated coordinates and ZWD in the framework of meteorological applications

Applied Geomatics, 2018
Since many years, the GNSS has been regarded by the meteorological community as one of the systems for atmospheric water vapour remote sensing. Time series of wet delays, estimated as by-products of accurate positioning, have been assimilated into numerical weather prediction models.
FERMI, ALESSANDRO, Eugenio Realini, Giovanna Venuti   +2 more
openaire   +3 more sources

Interrelationships between Satellite Imagery Pollutants and Aerosol Particles in Air Quality Assessment (NO2, SO2, O3, CO, AOD) and GNSS ZWD Data

2023 8th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR), 2023
Air pollution is a critical environmental issue with significant implications for human health and the well-being of ecosystems. In Surabaya, Indonesia, a rapidly growing urban center, the deterioration of air quality due to industrialization ...
Failaqul Haq, Mokhamad Nur Cahyadi, Josaphat Tetuko Sri Sumantyo   +2 more
openaire   +2 more sources

Development of a Tropospheric Delay Estimation Model Based on Observed Atmospheric Pressure and High-precision GNSS Data Processed ZWD Estimation Values

Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, 2023
Yeong-Guk Kim, Hye-In Kim, Kwan-Dong Park   +2 more
openaire   +2 more sources

Optimizing ZWD estimation strategies for enhanced PPP-RTK performance

GPS Solutions
Rui Gao, Fei Ye, Yang Liu, Jiuping Zha, Robert Odolinski, Chalermchon Satirapod, Baocheng Zhang   +6 more
openaire   +2 more sources