A Hierarchical Planning Method for the Inter-satellite Links Network of Navigation Satellite Constellations

2019 ◽  
pp. 62-70
Author(s):  
Yaoyao Yu ◽  
Yin Hao ◽  
Jianfang Wei ◽  
Hefang Zheng
Keyword(s):  
Planning Method ◽  
Navigation Satellite ◽  
Hierarchical Planning ◽  
Satellite Constellations ◽  
Satellite Links

Lower Bounds on DOP

2017 ◽  
Vol 70 (5) ◽  
pp. 1041-1061 ◽  
Author(s):  
Peter F. Swaszek ◽  
Richard J. Hartnett ◽  
Kelly C. Seals
Keyword(s):  
Lower Bounds ◽  
Global Navigation Satellite System ◽  
Satellite System ◽  
Navigation Satellite ◽  
Satellite Constellations ◽  
Dilution Of Precision ◽  
Gnss Positioning ◽  
Satellite Selection ◽  
Global Navigation ◽  
Global Navigation Satellite

Code phase Global Navigation Satellite System (GNSS) positioning performance is often described by the Geometric or Position Dilution of Precision (GDOP or PDOP), functions of the number of satellites employed in the solution and their geometry. This paper develops lower bounds to both metrics solely as functions of the number of satellites, effectively removing the added complexity caused by their locations in the sky, to allow users to assess how well their receivers are performing with respect to the best possible performance. Such bounds will be useful as receivers sub-select from the plethora of satellites available with multiple GNSS constellations. The bounds are initially developed for one constellation assuming that the satellites are at or above the horizon. Satellite constellations that essentially achieve the bounds are discussed, again with value toward the problem of satellite selection. The bounds are then extended to a non-zero mask angle and to multiple constellations.

scholarly journals Ubiquitous Robotic Technology for Smart Manufacturing System

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
Wenshan Wang ◽  
Xiaoxiao Zhu ◽  
Liyu Wang ◽  
Qiang Qiu ◽  
Qixin Cao
Keyword(s):  
Manufacturing Systems ◽  
Planning Method ◽  
Smart Factory ◽  
Smart Manufacturing ◽  
Hierarchical Planning ◽  
Test Bed ◽  
Robotic Technology ◽  
Robotic Devices ◽  
Smart Manufacturing Systems ◽  
First Time

As the manufacturing tasks become more individualized and more flexible, the machines in smart factory are required to do variable tasks collaboratively without reprogramming. This paper for the first time discusses the similarity between smart manufacturing systems and the ubiquitous robotic systems and makes an effort on deploying ubiquitous robotic technology to the smart factory. Specifically, a component based framework is proposed in order to enable the communication and cooperation of the heterogeneous robotic devices. Further, compared to the service robotic domain, the smart manufacturing systems are often in larger size. So a hierarchical planning method was implemented to improve the planning efficiency. A test bed of smart factory is developed. It demonstrates that the proposed framework is suitable for industrial domain, and the hierarchical planning method is able to solve large problems intractable with flat methods.

Doppler characterization of laser inter-satellite links for optical LEO satellite constellations

2009 ◽  
Vol 282 (17) ◽  
pp. 3547-3552 ◽  
Author(s):  
Qinglong Yang ◽  
Liying Tan ◽  
Jing Ma
Keyword(s):  
Satellite Constellations ◽  
Satellite Links ◽  
Leo Satellite
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