Cascade optimization design of inter-satellite link enhanced with adaptability in future GNSS satellite networks

GPS Solutions ◽  
2018 ◽  
Vol 22 (2) ◽  
Author(s):  
Jinhui Huang ◽  
Wenxiang Liu ◽  
Yingxue Su ◽  
Feixue Wang
Keyword(s):  
Optimization Design ◽  
Satellite Networks ◽  
Satellite Link

scholarly journals LIFT: a Local IPSec-aware Freezing Protocol to improve TCP Performance in Satellite Networks

2017 ◽  
Vol 2 (4) ◽  
pp. 347 ◽  
Author(s):  
Giovanni Ciccarese ◽  
Mario De Blasi ◽  
Sebastiano Elia ◽  
Cosimo Palazzo ◽  
Luigi Patrono
Keyword(s):  
Mobile Host ◽  
Satellite Networks ◽  
Web Page ◽  
Tcp Performance ◽  
Link Layer ◽  
Satellite Link ◽  
Channel Conditions ◽  
Simulation Results ◽  
Link Layer Protocol ◽  
Mean Time

In this paper a protocol, local to the satellite link, is defined in order to boost TCP performance in mobile integrated wired-satellite Internet. It has been conceived to help to overcome the well known retransmissions competition problem that arises when a satellite reliable link layer protocol is used to face satellite link errors. This protocol, called Local IPSec-aware Freezing proTocol (LIFT), has been designed to allow the satellite gateway, even in the presence of communications secured by IPSec, to freeze the TCP sender when it perceives a possible delay due to satellite channel conditions. The effectiveness of LIFT has been evaluated, using the ns-2 tool, in terms of Web page download mean time for a satellite mobile host. Simulation results have shown that the adoption of LIFT protocol provides substantial improvements in TCP performance.

scholarly journals TETRA Backhauling via Satellite: Improving Call Setup Times and Saving Bandwidth

2014 ◽  
Vol 2014 ◽  
pp. 1-16 ◽  
Author(s):  
Anton Donner ◽  
Jawad Ahmed Saleemi ◽  
Javier Mulero Chaves
Keyword(s):  
Disaster Management ◽  
Satellite Communications ◽  
Propagation Delay ◽  
Satellite Networks ◽  
Setup Times ◽  
Signal Delay ◽  
Management Scenarios ◽  
Satellite Link ◽  
Core Networks ◽  
Call Setup

In disaster management scenarios with seriously damaged, not existing, or saturated communication infrastructures satellite communications can be an ideal means to provide connectivity with unaffected remote terrestrial trunked radio (TETRA) core networks. However, the propagation delay imposed by the satellite link affects the signalling protocols. This paper discusses the suitability of using a satellite link for TETRA backhauling, introducing two different architectures. In order to cope with the signal delay of the satellite link, the paper proposes and analyzes a suitable solution based on the use of a performance enhancing proxy (PEP). Additionally, robust header compression (ROHC) is discussed as suitable technology to transmit TETRA voice via IP-based satellite networks.

Optimization design of inter-satellite link (ISL) assignment parameters in GNSS based on genetic algorithm

2017 ◽  
Vol 60 (12) ◽  
pp. 2574-2580 ◽  
Author(s):  
Jinhui Huang ◽  
Yingxue Su ◽  
Wenxiang Liu ◽  
Feixue Wang
Keyword(s):  
Genetic Algorithm ◽  
Optimization Design ◽  
Satellite Link

Optimal design of a high homogeneous and small-size shim coil for atomic spin gyroscope based on 0-1 linear programming

2020 ◽  
Vol 64 (1-4) ◽  
pp. 165-172
Author(s):  
Dongge Deng ◽  
Mingzhi Zhu ◽  
Qiang Shu ◽  
Baoxu Wang ◽  
Fei Yang
Keyword(s):  
Linear Programming ◽  
Power Consumption ◽  
Low Power ◽  
Optimization Design ◽  
Structural Parameters ◽  
Axial Position ◽  
Low Power Consumption ◽  
Optimal Method ◽  
Atomic Spin ◽  
Shim Coil

It is necessary to develop a high homogeneous, low power consumption, high frequency and small-size shim coil for high precision and low-cost atomic spin gyroscope (ASG). To provide the shim coil, a multi-objective optimization design method is proposed. All structural parameters including the wire diameter are optimized. In addition to the homogeneity, the size of optimized coil, especially the axial position and winding number, is restricted to develop the small-size shim coil with low power consumption. The 0-1 linear programming is adopted in the optimal model to conveniently describe winding distributions. The branch and bound algorithm is used to solve this model. Theoretical optimization results show that the homogeneity of the optimized shim coil is several orders of magnitudes better than the same-size solenoid. A simulation experiment is also conducted. Experimental results show that optimization results are verified, and power consumption of the optimized coil is about half of the solenoid when providing the same uniform magnetic field. This indicates that the proposed optimal method is feasible to develop shim coil for ASG.

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