Results 121 to 130 of about 19,851 (292)

Doppler Shift Based Low Earth Orbit Satellite Terminal Positioning Technology

天地一体化信息网络
The integration of communication, navigation and remote sensing is the evolutinary direction for future low earth orbit (LEO) satellite Internet to achieve ubiquitous integrated space-based information service.
WEI Fan, WANG Jikang, ZHAO Yuyan, LIAO Yucheng   +3 more
doaj  

Macrophage‐targeted cerium‐tannic acid metal‐polyphenol framework nanoenzyme promotes in situ heart valves regeneration through adaptive immunomodulation

BMEMat, EarlyView.
A novel nanoenzyme based on cerium ions‐tannic acid metal‐polyphenol framework (FCT) has been developed and loaded onto DHVs for targeting M1 macrophages to reduce their ROS level and reprogram macrophage phenotype, thereby eliminating inflammation, promoting endothelialization and adaptive matrix remodeling of scaffolds, offering a promising strategy ...
Peng Song, Yunlong Wu, Xing Chen, Yafei Liu, Mengna Dong, Jiawei Shi, Xichi Wang, Nianguo Dong, Weihua Qiao, Qin Wang   +9 more
wiley   +1 more source

A Fast Satellite Selection Method Based on the Multi-Strategy Fusion Grey Wolf Optimization Algorithm for Low Earth Orbit Satellites

Remote Sensing
Low Earth Orbit (LEO) satellites utilizing Doppler measurements can be an effective supplementary positioning solution when Global Navigation Satellite System (GNSS) signals are unavailable.
Wei Lv, Mingjian Chen, Xingyu Shi, Yuxing Li, Yang Shen, Wanli Li, Shuai Tong   +6 more
doaj   +1 more source

Frequency Instability Impact of Low-Cost SDRs on Doppler-Based Localization Accuracy

In this paper, we explore several widely available software-defined radio (SDR) platforms that could be used for locating with the signal Doppler frequency (SDF) method.
Krzysztof Różyc, Jan M. Kelner, Kacper Bednarz, Jarosław Wojtuń   +3 more
core   +1 more source

Precise Three-dimensional Positioning of Spacecrafts by Multi-frequency VLBI and Doppler Measurementys [PDF]

, 2002
総合研究大学院大学博士（理学）The study on orbital motion and the interior structure of the Moon and planets is one of the methods to approach for the revolution as a dynamical system and the origin of the solar system.
コウノ, ユウスケ, 河野, 裕介, KONO, Yusuke   +2 more
core  

Doppler Positioning Using Multi-Constellation LEO Satellite Broadband Signals as Signals of Opportunity [PDF]

This paper investigates the potential of signals of opportunity for positioning using broadband low Earth orbit constellations. We developed analytical absolute and differential models based on Doppler-shift observations from multi-constellation ...
El-Mowafy, Ahmed, Wang, K., Allahvirdizadeh, Amir   +2 more
core   +1 more source

Radial capacity and hemodynamics evaluation in vitro and implantable feasibility validation in vivo of thinner bioresorbable polymer vascular stents

BMEMat, EarlyView.
A series of in vitro experiments, numerical simulations and in vivo experiments were conducted to jointly evaluate the effects of different thicknesses of bioabsorbable polymer vascular stents on their radial capacity, hemodynamics and in vivo outcomes.
Chong Chen, Tao Li, Zhongyou Li, Jingyuan Zhou, Zhuo Zhang, Yan Xiong, Rifang Luo, Yu Chen, Yunbing Wang, Ping Fu   +9 more
wiley   +1 more source

LSTM-Assisted Doppler Opportunistic Positioning with Low Earth Orbit Satellites

天地一体化信息网络
Opportunistic positioning using the instantaneous Doppler frequency offset of low earth orbit (LEO) satellite communication signals faces the following problems: significant impact of frequency offset estimation errors on positioning accuracy and ...
Wei Yuming, Cui Gaofeng, Wu Mengjing, Wang Weidong   +3 more
doaj  

Tensions of Sustainability Logics: Performance of a Company Utilizing a Sustainable Business Model

Business Strategy and the Environment, EarlyView.
ABSTRACT In recent years, companies have used sustainable business models to gain a competitive advantage. However, there are tensions due to the inconsistency between social, environmental, and economic logic in sustainable business models, making it difficult for companies to change. To understand the existing tensions and interactions between logics,
Ann‐Kristin Thienemann
wiley   +1 more source

Geodetic positioning using a global positioning system of satellites

, 1980
Prepared for National Aeronautics and Space Administration, Goddard Space Flight Center, Greenbelt, Maryland: Grant No. NSG 5265, OSURF Project 711055Prepared for Defense Mapping Agency, Washington, D.C., Under Contract to the Naval Surface Weapons ...
Fell, Patrick J.
core