Results 21 to 30 of about 46,869 (239)

The GNSS-R Eddy Experiment II: L-band and Optical Speculometry for Directional Sea-Roughness Retrieval from Low Altitude Aircraft [PDF]

, 2003
We report on the retrieval of directional sea-roughness (the full directional mean square slope, including MSS, direction and isotropy) through inversion of Global Navigation Satellite System Reflections (GNSS-R) and SOlar REflectance Speculometry (SORES)
B. Chapron, Barrick, Cardellach, Chelton, Elfouhaily, Elfouhaily, F. Soulat, G. Ruffini, Garrison, Garrison, Gourrion, Komjathy, Komjathy, Lowe, M. Caparrini, O. Germain, P. Silvestrin, Ruffini, Soulat, Zavorotny, Zuffada   +20 more
core   +6 more sources

The Current Status of Research on GNSS-R Remote Sensing Technology in China and Future Development

Leida xuebao, 2013
Global Navigation Satellite System (GNSS), has a significant impact on all areas of human activity, not only can provide users with shared global navigation, position and timing information, but also can provide a L-band microwave signal source of long ...
Li Huang, Xia Qing, Yin Cong, Wan Wei
doaj   +1 more source

A Feasibility Analysis of Land-Based SINS/GNSS Gravimetry for Groundwater Resource Detection in Taiwan

Sensors, 2015
The integration of the Strapdown Inertial Navigation System and Global Navigation Satellite System (SINS/GNSS) has been implemented for land-based gravimetry and has been proven to perform well in estimating gravity.
Kai-Wei Chiang, Cheng-An Lin, Chung-Yen Kuo   +2 more
doaj   +1 more source

Spatiotemporal Evaluation of GNSS-R Based on Future Fully Operational Global Multi-GNSS and Eight-LEO Constellations

Remote Sensing, 2018
Spaceborne GNSS-R (global navigation satellite system reflectometry) is an innovative and powerful bistatic radar remote sensing technique that uses specialized GNSS-R instruments on LEO (low Earth orbit) satellites to receive GNSS L-band signals ...
Fan Gao, Tianhe Xu, Nazi Wang, Chunhua Jiang, Yujun Du, Wenfeng Nie, Guochang Xu   +6 more
doaj   +1 more source

Preliminary Design of Monitoring and Control Subsystem for GNSS Ground Station [PDF]

Journal of Astronomy and Space Sciences, 2008
GNSS (Global Navigation Satellite System) Ground Station monitors navigation satellite signal, analyzes navigation result, and uploads correction information to satellite.
Seongkyun Jeong, Jae-Eun Lee, Hanearl Park, Sanguk Lee, Jaehoon Kim   +4 more
doaj   +1 more source

Analysis of differential code biases and inter-system biases for GPS and NavIC satellite constellations

AIMS Electronics and Electrical Engineering, 2021
Multi Global Navigation Satellite System (GNSS) plays an essential role in navigation and geodesy fields for positioning, Navigation, and Timing (PNT) services.
K. Siva Krishna , D. Venkata Ratnam
doaj   +1 more source

Safety arguments for next generation location aware computing [PDF]

, 2010
Concerns over the accuracy, availability, integrity and continuity of Global Navigation Satellite Systems (GNSS) have limited the integration of GPS and GLONASS for safety-critical applications.
Holloway, C.M., Johnson, C.W.
core   +2 more sources

Study on LOS to Vertical Deformation Conversion Model on Embankment Slopes Using Multi-Satellite SAR Interferometry

ISPRS International Journal of Geo-Information
Slant range geometry plays a crucial role in interpreting synthetic aperture radar (SAR) observations, especially in converting line-of-sight (LOS) surface deformations to actual vertical subsidence. This paper proposes a new conversion model to retrieve
Jie Liu, Tao Li, Sijie Ma, Qiang Shan, Weiping Jiang   +4 more
doaj   +1 more source

A Minimal Solution for Binocular Camera Relative Pose Estimation Based on the Gravity Prior

Remote Sensing
High-precision positioning is the foundation for the functionality of various intelligent agents. In complex environments, such as urban canyons, relative pose estimation using cameras is a crucial step in high-precision positioning. To take advantage of
Dezhong Chen, Kang Yan, Hongping Zhang, Zhenbao Yu   +3 more
doaj   +1 more source

A Minimal Solution Estimating the Position of Cameras with Unknown Focal Length with IMU Assistance

Drones
Drones are typically built with integrated cameras and inertial measurement units (IMUs). It is crucial to achieve drone attitude control through relative pose estimation using cameras. IMU drift can be ignored over short periods.
Kang Yan, Zhenbao Yu, Chengfang Song, Hongping Zhang, Dezhong Chen   +4 more
doaj   +1 more source