Results 61 to 70 of about 4,586 (165)

An SDR-Based GNSS-R CubeSat Payload: Hardware Development and Optimization of the Onboard Processing

IEEE Access
Recent developments in high-performance Software Defined Radios (SDRs) and their utilization in CubeSat payloads are transforming Earth Observation (EO), including Microwave Radiometers, Global Navigation and Satellite System – Radio Occultations (
Shah Zahid Khan, Yasir M. O. Abbas, Edwar Edwar, Abdul-Halim Jallad, Adriano Camps   +4 more
doaj   +1 more source

GNSS-R Soil Moisture Retrieval Based on a XGboost Machine Learning Aided Method: Performance and Validation

Remote Sensing, 2019
Global navigation satellite system (GNSS)-reflectometry is a type of remote sensing technology and can be applied to soil moisture retrieval. Until now, various GNSS-R soil moisture retrieval methods have been reported.
Yan Jia, Shuanggen Jin, Patrizia Savi, Yun Gao, Jing Tang, Yixiang Chen, Wenmei Li   +6 more
doaj   +1 more source

Sea Surface Height Measurements Using UAV Altimeters with Nadir LiDAR or Low-Cost GNSS Reflectometry

Remote Sensing
Although UAV height is precisely determined using GNSS, the vertical distance between the UAV and the sea surface should be subtracted to obtain the sea surface height (SSH).
Kaoru Ichikawa, Jyoushiro Noda, Ryosuke Sakemi, Kei Yufu, Akihiko Morimoto, Hidejiro Onishi, Tanuspong Pokavanich   +6 more
doaj   +1 more source

Prototyping a GNSS-Based Passive Radar for UAVs: An Instrument to Classify the Water Content Feature of Lands

Sensors, 2015
Global Navigation Satellite Systems (GNSS) broadcast signals for positioning and navigation, which can be also employed for remote sensing applications.
Micaela Troglia Gamba, Gianluca Marucco, Marco Pini, Sabrina Ugazio, Emanuela Falletti, Letizia Lo Presti   +5 more
doaj   +1 more source

Analysis of GNSS-R delay and Doppler tracking errors

2012 Workshop on Reflectometry Using GNSS and Other Signals of Opportunity (GNSS+R), 2012
The compensation of the delay and Doppler errors using tracking is important to accurately estimate the sea height in spaceborne GNSS-R. This work presents the impacts of the tracking residual errors on the GNSS-R observables, and potential tracking strategies for spaceborne GNSS-R. Tracking error impacts are visually demonstrated by using the P2EPS
Hyuk, Park, Camps Carmona, Adriano José, Valencia Domènech, Enric, Carreño Luengo, Hugo, Martín Alemany, Francisco, Alonso Arroyo, Alberto, Pascual Biosca, Daniel   +6 more
openaire   +2 more sources

Retrieval ocean surface wind speed of Triton meteorological satellite mission

Terrestrial, Atmospheric and Oceanic Sciences
Global Navigation Satellite Systems-Reflectometry (GNSS-R) technique is used to explore the Earth environment by using the Earth surface reflected GNSS signal.
Wen-Hao Yeh, Yung-Fu Tsai, Chen-Tsung Lin, Chun-Chi Cheng, Shih-Hung Lo, Hsu-Hui Ho, Jyun-Ying Huang, Tie-Yue Liu, Chao-Yen Chen   +8 more
doaj   +1 more source

GMF development for GNSS-R

, 2018
GNSS-R Workshop, Advances in Earth Observation with GNSS Reflectometry from space: TechDemoSat-1 User Workshop and ESA TGScatt Presentation, 24 May 2018, Southampton, UK.-- 27 ...
Portabella, Marcos, Lin, Wenming
openaire   +1 more source

PARFAIT: GNSS-R coastal altimetry

, 2003
GNSS-R signals contain a coherent and an incoherent component. A new algorithm for coherent phase altimetry over rough ocean surfaces, called PARFAIT, has been developed and implemented in Starlab's STARLIGHT GNSS-R software package. In this paper we report our extraction and analysis of the coherent component of L1 GPS-R signals collected during the ...
Caparrini, M., Ruffini, L., Ruffini, G.
openaire   +2 more sources

Spaceborne GNSS Reflectometry for Vegetation and Inland Water Monitoring: Progress, Challenges, Opportunities, and Potential

Remote Sensing
Global navigation satellite system reflectometry (GNSS-R) uses the reflection characteristics of navigation satellite signals reflected from the earth’s surface to provide an innovative tool for remote sensing, especially for monitoring surface and ...
Jiaxi Xie, Jinwei Bu, Huan Li, Qiulan Wang   +3 more
doaj   +1 more source

Performance Validation of Sea Surface Wind Speed Retrieval Algorithms and Products From the Chinese Tianmu-1 Constellation GNSS-R: First Results on Comparison With Other Wind Speed Products

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
The Tianmu-1 constellation is mainly based on BeiDou/Global Navigation Satellite System radio occultation (GNSS-RO) and BeiDou/GNSS reflectometry (GNSS-R) remote sensing technology, which can simultaneously achieve integrated stereo detection of GNSS-RO ...
Xinyu Liu, Jinwei Bu, Xiaoqing Zuo, Ziyi Wang, Qiulan Wang, Qihan Wang, Chaoying Ji, Youwen Zhao, Hui Yang, Xin He   +9 more
doaj   +1 more source