Results 41 to 50 of about 4,586 (165)

Investigation of Potential of GNSS-R Polarization: Theoretical Simulations

Remote Sensing, 2022
Global navigation satellite system (GNSS) reflectometry (GNSS-R) developed into a promising remote sensing technique. However, few previous related studies considered the potential of its polarization. Owing to lack of sufficient in situ measurement data to support comprehensive investigation of GNSS-R polarization, this study used theoretical models ...
Xuerui Wu, Xiaoyong Du, Feng Yan, Weihua Bai, Shaohui Song   +4 more
openaire   +2 more sources

Remote sensing and its applications using GNSS reflected signals: advances and prospects

Satellite Navigation
The Global Navigation Satellite Systems (GNSS), including the US’s GPS, China’s BDS, the European Union’s Galileo, and Russia’s GLONASS, offer real-time, all-weather, any-time, anywhere and high precision observations by transmitting L band signals ...
Shuanggen Jin, Adriano Camps, Yan Jia, Feng Wang, Manuel Martin-Neira, Feixiong Huang, Qingyun Yan, Shuangcheng Zhang, Zhongyu Li, Komi Edokossi, Dongkai Yang, Zhiyu Xiao, Zhongmin Ma, Weihua Bai   +13 more
doaj   +1 more source

Review of GNSS-R Technology for Soil Moisture Inversion

Remote Sensing
Soil moisture (SM) is an important parameter in water cycle research. Rapid and accurate monitoring of SM is critical for hydrological and agricultural applications, such as flood detection and drought characterization.
Changzhi Yang, Kebiao Mao, Zhonghua Guo, Jiancheng Shi, Sayed M. Bateni, Zijin Yuan   +5 more
doaj   +1 more source

The first polarimetric GNSS-Reflectometer instrument in space improves the SMAP mission’s sensitivity over densely vegetated areas

Scientific Reports, 2023
The Soil Moisture Active Passive (SMAP) mission has dramatically benefited our knowledge of the Earth’s surface processes. The SMAP mission was initially designed to provide complementary L-band measurements from a radiometer and a radar, producing ...
Nereida Rodriguez-Alvarez, Joan Francesc Munoz-Martin, Xavier Bosch-Lluis, Kamal Oudrhiri, Dara Entekhabi, Andreas Colliander   +5 more
doaj   +1 more source

3CAT-3/MOTS, an Experimental Nanosatellite for Multispectral and GNSS-R Earth Observation: Airborne Optical and GNSS-R Campaign

IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium, 2018
The 3 Cat-3/MOTS mission is a joint initiative between the Institut Cartogràfic i Geològic de Catalunya (ICGC) and the Universitat Politècnica de Catalunya-BarcelonaTech (UPC) to foster new and innovative technologies on Earth Observation (EO) based on the data fusion of Global Navigation Satellite Systems Reflectometry (GNSS-R) and optical payloads on
Jordi Castellvi Esturi, Adriano Camps, Jordi Corbera, Raul Onrubia, Ramon Alamus, Daniel Pascual, Jorge Querol, Hyuk Park 0001   +7 more
openaire   +2 more sources

Analysis of GNSS Interference Events Based on TRITON GNSS-R Measurements

Navigation
Although the issue of global navigation satellite system (GNSS) interference has been addressed in the community of satellite navigation, the extent of GNSS interference in the past couple of years has raised serious concerns for air and marine ...
Jyh-Ching Juang, Yung-Fu Tsai
doaj   +1 more source

Analysis of Spaceborne GNSS-R Delay-Doppler Tracking

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2014
For spaceborne Global Navigation Satellite System-Reflectometry (GNSS-R), the delay and Doppler frequency conditions dynamically change, so the compensation of the delay and Doppler errors using tracking is important to the altimetric and scatterometric performances.
Hyuk, Park, Pascual Biosca, Daniel, Camps Carmona, Adriano José, Martínez Mindeguía, Francisco, Alonso Arroyo, Alberto, Carreño Luengo, Hugo   +5 more
openaire   +3 more sources

Derivation of the Cramér-Rao Bound in the GNSS-Reflectometry Context for Static, Ground-Based Receivers in Scenarios with Coherent Reflection

Sensors, 2016
The use of the reflected Global Navigation Satellite Systems’ (GNSS) signals in Earth observation applications, referred to as GNSS reflectometry (GNSS-R), has been already studied for more than two decades.
Miguel Angel Ribot, Cyril Botteron, Pierre-André Farine   +2 more
doaj   +1 more source

GNSS-R Altimeter Based on Doppler Multi-looking

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2014
Measuring ocean mesoscale variability is one of the main objectives of next generation satellite altimeters. Current radar altimeters make observations only at the nadir sub-satellite ground track, which is not sufficient to sample the ocean surface with the required spatial and temporal sampling.
Salvatore D'Addio, Manuel Martín-Neira, Maurizio di Bisceglie, Carmela Galdi, Francisco Martín Alemany   +4 more
openaire   +3 more sources

Potential Applications of GNSS-R Observations over Agricultural Areas: Results from the GLORI Airborne Campaign

Remote Sensing, 2018
The aim of this study is to analyze the sensitivity of airborne Global Navigation Satellite System Reflectometry (GNSS-R) on soil surface and vegetation cover characteristics in agricultural areas.
Mehrez Zribi, Erwan Motte, Nicolas Baghdadi, Frédéric Baup, Sylvia Dayau, Pascal Fanise, Dominique Guyon, Mireille Huc, Jean Pierre Wigneron   +8 more
doaj   +1 more source