Results 81 to 90 of about 2,505 (209)

A Gaussian Variogram‐Based Model of Total Electron Content in the Regional Ionosphere of China

Space Weather, Volume 22, Issue 11, November 2024.
Abstract This study utilizes ionospheric total electron contents (TECs) data from China and its surrounding areas to compute the regional ionospheric semi‐variance using the Gaussian variogram. The regional ionospheric model is then constructed by introducing an additional stochastic term, named adjusted Spherical Harmonics Adding KrigING method ...
Ang Liu, Zishen Li, Ningbo Wang, Ang Li, Zhouyu Zhang, Yunlong Zhang   +5 more
wiley   +1 more source

China’s dichotomous BeiDou strategy: led by the party for national deployment, driven by the market for global reach

Journal of Contemporary East Asia Studies, 2022
China’s foremost national goal is to become a major space power by 2030. Consequently, President Xi Jinping has made the launch of the BeiDou navigation satellite system (BDS) and promotion of a “BDS global network” a national priority.BDS represents a ...
Rumi Aoyama
doaj   +1 more source

Single point positioning using GPS, GLONASS and BeiDou satellites [PDF]

, 2014
This paper introduces the Chinese BeiDou satellite system and its comparison with the actual completed American GPS and the Russian GLONASS systems. The actual BeiDou system consists of 14 satellites covering totally the Asia -
Cai, Changsheng, Pan, Lin, Santerre, Rock, Zhu, Jianjun   +3 more
core   +2 more sources

Mainlobe and sidelobe jamming suppression method based on distributed array radar with eigen‐projection matrix processing and null constraints

IET Radar, Sonar &Navigation, Volume 18, Issue 11, Page 2212-2221, November 2024.
A mainlobe and sidelobe jamming suppression method with eigen‐projection matrix processing (EMP) and null constraints is proposed based on the distributed array radar. In the proposed method, EMP beamforming is performed in subarrays for sidelobe jamming suppression, and null constraints are applied to suppress the residual jamming in auxiliary arrays.
Bowen Han, Xiaopeng Yang, Qiang Lv, Wolin Li, Zhengyan Zhang, Shichao Zhong   +5 more
wiley   +1 more source

Revealing Inconsistencies in ROTI Index Using Multi‐GNSS Constellation Measurements: Impact of Sampling Rates and Time Window

Radio Science, Volume 59, Issue 10, October 2024.
Abstract Understanding ionospheric irregularities and their dynamics is crucial, with the rate of change of the total electron content index (ROTI) serving as a significant metric for this purpose. However, inconsistencies in ROTI magnitudes have been noted when sampled at one‐second interval across various Global Navigation Satellite System (GNSS ...
Yi Sui, Zhe Yang, Weijia Zhan
wiley   +1 more source

Architecture design of BeiDou global navigation signals

Geo-spatial Information Science
Navigation signals play a crucial role in determining the performance and user experience of Global Navigation Satellite System (GNSS). In recent years, GNSSs have been actively modernizing their signal architectures to meet the increasing demand for ...
Shuren Guo, Chengeng Su, Feiren Lv
doaj   +1 more source

Availability evaluation and optimisation of advanced receiver autonomous integrity monitoring fault detection and exclusion considering temporal correlations

IET Radar, Sonar &Navigation, Volume 18, Issue 10, Page 1966-1979, October 2024.
An availability optimisation method of ARAIM FDE based on dynamic budget allocation is proposed to achieve strong integrity monitoring performance. The performances of the baseline algorithm and the proposed method are simulated. Abstract The Advanced Receiver Autonomous Integrity Monitoring (ARAIM) provides an Aircraft‐Based Augmentation System ...
Jingtian Du, Kun Fang, Zhipeng Wang, Yanbo Zhu   +3 more
wiley   +1 more source

Sea Surface Height Estimation by Ground-Based BDS GEO Satellite Reflectometry

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2020
Chinese BeiDou Navigation Satellite System (BDS) as a mixed constellation consists of not only medium earth orbit (MEO) satellites but also inclined geosynchronous orbit and geostationary earth orbit (GEO) satellites, of which the GEO satellites remain ...
Jianming Wu, Yanling Chen, Fan Gao, Peng Guo, Xiaoya Wang, Xinliang Niu, Mengjie Wu, Naifeng Fu   +7 more
doaj   +1 more source

Design of vehicle positioning system based on artificial intelligence cloud computing technology

IET Wireless Sensor Systems, Volume 14, Issue 5, Page 209-222, October 2024.
Vehicle positioning is an important part of intelligent transportation system research. In the tunnel environment, the GPS signal is blocked, which leads to the decrease or even failure of the vehicle positioning accuracy. In order to solve the problem of vehicle positioning in this environment, various vehicle positioning technologies emerge as the ...
Jifeng Liang
wiley   +1 more source

Site selection analysis of radio monitoring stations to BDS based on STK orbital prediction data

Dianxin kexue, 2018
BeiDou navigation satellite system (BDS) is a global navigation satellite system constructed and operated by China.At present,BDS is able to provide location,navigation and time service in Asia-Pacific,and will provide global service in 2020 as planned ...
Qi ZHANG, Hui LIN
doaj   +2 more sources