Results 11 to 20 of about 2,695 (175)
Precise Point Positioning with the BeiDou Navigation Satellite System [PDF]
Sensors, 2014 By the end of 2012, China had launched 16 BeiDou-2 navigation satellites that include six GEOs, five IGSOs and five MEOs. This has provided initial navigation and precise pointing services ability in the Asia-Pacific regions.
Qile Zhao, Jing Guo, Qu Lizhong
exaly +6 more sources
Initial Results of the Precise Orbit Determination for the New-Generation BeiDou Satellites (BeiDou-3) Based on the iGMAS Network [PDF]
ISPRS International Journal of Geo-Information, 2016 By August 2016, 5 new-generation BeiDou satellites (BeiDou-3) have successfully been launched. The observations of a very limited number of 9 International GNSS (Global Navigation Satellite System) Monitoring and Assessment Service (iGMAS) stations and ...
Xifeng Liu, Yafei Ning, Bingfeng Tan
exaly +4 more sources
<i>Leptochilus yangjiangensis</i> (Polypodiaceae), a New Fern Species From Guangdong, China. [PDF]
Ecol EvolWe describe Leptochilus yangjiangensis, a new fern species from Guangdong, China, which was previously misidentified as L. pedunculatus; it differs from morphologically similar congeners by coriaceous laminae and lanceolate fertile fronds. Phylogenetic analyses (using three plastid regions) place it as sister to L.
Zhou HJ +7 more
europepmc +2 more sources
FFAE-UNet: An Efficient Pear Leaf Disease Segmentation Network Based on U-Shaped Architecture [PDF]
SensorsThe accurate pest control of pear tree diseases is an urgent need for the realization of smart agriculture, with one of the key challenges being the precise segmentation of pear leaf diseases.
Wenyu Wang +4 more
doaj +2 more sources
Overcoming the Challenges of BeiDou Receiver Implementation [PDF]
Sensors, 2014 Global Navigation Satellite System (GNSS)-based positioning is experiencing rapid changes. The existing GPS and the GLONASS systems are being modernized to better serve the current challenging applications under harsh signal conditions.
Mohammad Zahidul H. Bhuiyan +4 more
doaj +3 more sources
Sensors, 2018 In 2015, the plan for global coverage by the Chinese BeiDou Navigation Satellite System was launched. Five global BeiDou experimental satellites (BeiDou-3e) are in orbit for testing.
Xiaolong Xu, Liu Jingnan
exaly +3 more sources
Characterization and Performance Assessment of BeiDou-2 and BeiDou-3 Satellite Group Delays [PDF]
NAVIGATION: Journal of the Institute of Navigation, 2022 Based on one year of data, a comprehensive assessment of broadcast group delays and differential code biases (DCBs) from network solutions is presented for all open BeiDou signals. Daily DCB estimates exhibit a precision of 0.1 ns, which also places a limit on long-term variations of the satellite group delays.
Montenbruck, Oliver +3 more
openaire +3 more sources
Agriculture, 2023 Image datasets acquired from orchards are commonly characterized by intricate backgrounds and an imbalanced distribution of disease categories, resulting in suboptimal recognition outcomes when attempting to identify apple leaf diseases.
Jie Ding +6 more
doaj +1 more source
Enhancing BeiDou/GNSS integrity with minmax optimization. [PDF]
PNAS NexusAbstract In navigation scenarios, integrity is a crucial metric for evaluating system availability, with improvements in integrity having implications for transportation, security, and surveillance. This article proposes a novel integrity monitoring strategy, termed the optimal advanced receiver autonomous integrity monitoring ...
Qiu J, Chen C, Lei S, Lyu Y, Xie S.
europepmc +3 more sources
BMC Bioinformatics, 2022 Background Essential Proteins are demonstrated to exert vital functions on cellular processes and are indispensable for the survival and reproduction of the organism.
Yi Yue +7 more
doaj +1 more source