Results 11 to 20 of about 23,320,155 (243)

In-flight performance analysis of the navigation augmentation payload on LEO communication satellite: a preliminary study on WT01 mission

Geo-spatial Information Science, 2022
With the development of the Low Earth Orbit (LEO) communication constellations, it has become a hot area of research to provide additional navigation augmentation services.
Ziqian Wu, Baoguo Yu, Chuanzhen Sheng, Jingkui Zhang, Song Xie, Cailun Wu   +5 more
doaj   +1 more source

Research on None-Line-of-Sight/Line-of-Sight Identification Method Based on Convolutional Neural Network-Channel Attention Module

Sensors, 2023
None-Line-of-Sight (NLOS) propagation of Ultra-Wideband (UWB) signals leads to a decrease in the reliability of positioning accuracy. Therefore, it is essential to identify the channel environment prior to localization to preserve the high-accuracy Line ...
Jingjing Zhang, Qingwu Yi, Lu Huang, Zihan Yang, Jianqiang Cheng, Heng Zhang   +5 more
doaj   +1 more source

INITIAL CHECKOUT RESULTS OF THE COMPACT INFRARED CAMERA (CIRC) FOR EARTH OBSERVATION [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2015
Compact Infrared Camera (CIRC) is a technology-demonstration instrument equipped with an uncooled infrared array detector (microbolometer) for space application.
E. Kato, H. Katayama, M. Sakai, Y. Nakajima, T. Kimura, K. Nakau, H. Tonooka   +6 more
doaj   +1 more source

In‐Depth Evaluation of MiRS Total Precipitable Water From NOAA‐20 ATMS Using Multiple Reference Data Sets

Earth and Space Science, 2022
The National Oceanic and Atmospheric Administration (NOAA) Microwave Integrated Retrieval System (MiRS) algorithm has been producing retrieval products from NOAA‐20 Advanced Technology Microwave Sounder (ATMS) data since shortly after launch in late 2017.
Yong‐Keun Lee, Christopher Grassotti, Quanhua (Mark) Liu, Shu‐Yan Liu, Yan Zhou   +4 more
doaj   +1 more source

A Novel Perspective of the Kalman Filter from the Rényi Entropy

Entropy, 2020
Rényi entropy as a generalization of the Shannon entropy allows for different averaging of probabilities of a control parameter α. This paper gives a new perspective of the Kalman filter from the Rényi entropy.
Yarong Luo, Chi Guo, Shengyong You, Jingnan Liu   +3 more
doaj   +1 more source

Characterizing the tropospheric water vapor spatial variation and trend using 2007–2018 COSMIC radio occultation and ECMWF reanalysis data [PDF]

Atmospheric Chemistry and Physics, 2023
Atmospheric water vapor plays a crucial role in the global energy balance, hydrological cycle, and climate system. High-quality and consistent water vapor data from different sources are vital for weather prediction and climate research.
X. Shao, S.-P. Ho, X. Jing, X. Zhou, Y. Chen, T.-C. Liu, B. Zhang, B. Zhang, J. Dong   +8 more
doaj   +1 more source

Basic performance and future developments of BeiDou global navigation satellite system

, 2020
The core performance elements of global navigation satellite system include availability, continuity, integrity and accuracy, all of which are particularly important for the developing BeiDou global navigation satellite system (BDS-3).
Yuanxi Yang, Yue Mao, Bijiao Sun
semanticscholar   +1 more source

Spoofing and Anti-Spoofing Technologies of Global Navigation Satellite System: A Survey

IEEE Access, 2020
A large number of facts prove that Global Navigation Satellite System (GNSS) has certain security risks and is threatened by attacks. In particular, GNSS civilian signal receivers have some vulnerability in responding to spoofing attack and jamming ...
Zhi-jun Wu, Yun Zhang, Yiming Yang, Chen Liang, R. Liu   +4 more
semanticscholar   +1 more source

A Digital Twin-Based Approach for the Fault Diagnosis and Health Monitoring of a Complex Satellite System

Symmetry, 2020
The ever-increasing functional density and complexity of the satellite systems, the harsh space flight environment, as well as the cost reduction measures that require less operator involvement are increasingly driving the need to develop new approaches ...
D. Shangguan, Liping Chen, J. Ding
semanticscholar   +1 more source

End-Cloud Collaboration Navigation Planning Method for Unmanned Aerial Vehicles Used in Small Areas

Sensors, 2023
Unmanned aerial vehicle (UAV) collaboration has become the main means of indoor and outdoor regional search, railway patrol, and other tasks, and navigation planning is one of the key, albeit difficult, technologies.
Huajie Xiong, Baoguo Yu, Qingwu Yi, Chenglong He   +3 more
doaj   +1 more source