Weather-forecast based RMOP link-budget approach experimentation: data-transfer optimization at Ka-band with Hayabusa-2 satellite mission support

2021 ◽  
Author(s):  
M. Biscarini ◽  
S. Di Fabio ◽  
K. De Sanctis ◽  
M. Montagna ◽  
L. Milani ◽  
...  
Keyword(s):  
Data Transfer ◽  
Weather Forecast ◽  
Satellite Mission ◽  
Ka Band ◽  
Link Budget ◽  
Data Transfer Optimization ◽  
Hayabusa 2

scholarly journals High gain tapered slot antenna design and link budget analysis for inter-satellite link at 60GHz

2017 ◽  
Vol 7 (1.1) ◽  
pp. 627
Author(s):  
Banda Saisandeep ◽  
Venkateshwara Rao Morla ◽  
Shaik Ahmadsaidulu ◽  
Ch S.L. Prasanna ◽  
Venkata Rao Tirumalasetty ◽  
...  
Keyword(s):  
Satellite Communication ◽  
Data Transfer ◽  
Beam Width ◽  
High Gain ◽  
Antenna Design ◽  
Slot Antenna ◽  
60 Ghz ◽  
Budget Analysis ◽  
Efficient Data ◽  
Link Budget

The latest solution for Global Connectivity is Inter-satellite communication. Inter-satellite communication will able to connect two or more satellites directly and hence efficient data transfer is possible with less delay. Choice of frequency is key concern for inter-satellite communication. In this paper, precisely mentioned about importance of millimeter range frequency band for inter-satellite links (ISL) and more focused on the Tapered Slot antenna (TSA) design at 60 GHz. In the design, Substrate Integrated Waveguide SIW feed and corrugation techniques is used to achieve high gain and narrow beam width. Power Divider is used to design two-element TS antenna of 23 dB. For further outlook of antenna design link analysis is also calculated.  

Assessment and Uncertainty Estimation of Weather-Forecast Driven Data Transfer for Space Exploration at Ka- and $X$ -Band

2019 ◽  
Vol 67 (5) ◽  
pp. 3308-3322
Author(s):  
Marianna Biscarini ◽  
Klaide De Sanctis ◽  
Saverio Di Fabio ◽  
Mario Montopoli ◽  
Luca Milani ◽  
...  
Keyword(s):  
Data Transfer ◽  
Space Exploration ◽  
Weather Forecast ◽  
Uncertainty Estimation ◽  
X Band

ON ARCHITECTURE FOR SLA-AWARE WORKFLOWS IN GRID ENVIRONMENTS

2005 ◽  
Vol 06 (03) ◽  
pp. 245-263 ◽  
Author(s):  
Dang Minh Quan ◽  
Odej Kao
Keyword(s):  
Data Transfer ◽  
A Priori ◽  
Research Work ◽  
Service Level ◽  
Explicit Statement ◽  
Grid Environments ◽  
Data Transfer Optimization ◽  
Deadline Constraints ◽  
Grid Resources

Service Level Agreements (SLAs) are currently one of the major research topics in Grid Computing, as they serve as a foundation for reliable and predictable Grids. SLAs define an explicit statement of expectations and obligations in a business relationship between provider and customer. Thus, SLAs should guarantee the desired and a-priori negotiated Quality of Service (QoS), which is a mandatory prerequisite for the Next Generation Grids. This development is proved by a manifold research work about SLAs and architectures for implementing SLAs in Grid environments. However, this work is mostly related to SLAs for standard, monolithic Grid jobs and neglects the dependencies between different steps of operation. The complexity of an SLA-specification for workflows grows significantly, as characteristics of correlated sub-jobs, the data transfer phases, the deadline constraints and possible failures have to be considered. Thus, an architecture for an SLA-aware workflow implementation needs sophisticated mechanisms for specification and management, sub-job mapping, data transfer optimization and fault reaction. Therefore, this paper presents an architecture for SLA-aware Grid workflows. The main contributions are an improved specification language for SLA-aware workflows, a mapping and optimization algorithm for sub-job assignment to Grid resources and a prototype implementation using standard middleware. Experimental measurements prove the quality of the development.

scholarly journals Measuring Winds and Currents with Ka-Band Doppler Scatterometry: An Airborne Implementation and Progress towards a Spaceborne Mission

2020 ◽  
Vol 12 (6) ◽  
pp. 1021 ◽  
Author(s):  
Alexander Wineteer ◽  
Dragana Perkovic-Martin ◽  
Raquel Monje ◽  
Ernesto Rodríguez ◽  
Tamás Gál ◽  
...  
Keyword(s):  
Ocean Surface ◽  
Ocean Dynamics ◽  
Pencil Beam ◽  
Satellite Mission ◽  
Ka Band ◽  
Geophysical Model ◽  
Readiness Level ◽  
Ocean Surface Winds ◽  
Tightly Coupled ◽  
Wide Swath

Ocean surface winds and currents are tightly coupled, essential climate variables, synoptic measurements of which require a remote sensing approach. Global measurements of ocean vector winds have been provided by scatterometers for decades, but a synoptic approach to measuring total vector surface currents has remained elusive. Doppler scatterometry is a coherent burst-scatterometry technique that builds on the long heritage of spinning pencil beam scatterometers to enable the wide-swath, simultaneous measurement of ocean surface vector winds and currents. To prove the measurement concept, NASA funded the DopplerScatt airborne Doppler scatterometer through the Instrument Incubator Program (IIP) and Airborne Instrument Technology Transition (AITT) program. DopplerScatt has successfully shown that pencil beam Doppler scatterometry can be used to form wide swath measurements of ocean winds and currents, and has increased the technology readiness level of key instrument components, including: Ka-band pulsed radar hardware, optimized scatterometer burst-mode operation, calibration techniques, geophysical model functions, and processing algorithms. With the promise and progress shown by DopplerScatt, and the importance of air-sea interactions in mind, the National Academy’s Decadal Survey has targeted simultaneous measurements of winds and currents from a Doppler scatterometer for an Earth Explorer class spaceborne mission. Besides DopplerScatt’s place as a technology stepping stone towards a satellite mission, DopplerScatt provides scientifically important measurements of ocean currents and winds (400 m resolution) and their derivatives (1 km resolution) over a 25 km swath. These measurements are enabling studies of the submesoscales and air-sea interactions that were previously impossible, and are central to the upcoming NASA Earth Ventures Suborbital-3 Submesoscale Ocean Dynamics Experiment (S-MODE). This paper summarizes the development of DopplerScatt hardware, systems, calibration, and operations, and how advances in each relate to progress towards a spaceborne Doppler scatterometer mission.

Channel Attenuation Models over Ka Band Satellite Systems at Venezuelan Amazonian Area

2016 ◽  
Vol 841 ◽  
pp. 260-265
Author(s):  
Gustavo Guedez ◽  
Gao Qiang
Keyword(s):  
Low Frequency ◽  
Amazon Region ◽  
Atmospheric Gases ◽  
Ka Band ◽  
Satellite Systems ◽  
Clear Sky ◽  
Multipath Effects ◽  
Link Budget ◽  
Attenuation Models ◽  
Sky Conditions

The progressive congestion of the spectrum at low frequency bands, has obliged the need to use new systems which operate in higher frequencies, such as the Ka bands. The quality and availability of the signals in Ka band are seriously degraded by various climate phenomena, especially in the Amazon area. To keep the link properties in normal conditions (similar to clear sky conditions), is necessary to know the attenuation losses over the service area or footprint. For the Venezuelan Amazon region only Attenuation by atmospheric gases, Attenuation by rain and Scintillation and multipath effects, could be considered according to the ITU. The attenuation calculation is the first step to estimate the link budget and implement any communication service over Ka Band in the Venezuelan Amazon region. The aim of this research is modeling the channel attenuation for Ka band satellite signals and find a suitable attenuation data.

Data Transmission Optimization Based on Memobus RTU Communication Protocol

2013 ◽  
Vol 443 ◽  
pp. 374-379
Author(s):  
Bing Dong
Keyword(s):  
Data Transmission ◽  
Functional Data ◽  
Data Transfer ◽  
Communication Protocol ◽  
Technical Problem ◽  
Response Speed ◽  
Data Block ◽  
System Response ◽  
Data Transfer Optimization ◽  
Message Format

The article introduces the constitution and message format of Memo bus RTU Communication Protocol, and provides a method for data transfer optimization through by the analysis of the communication protocol format. This method is fit on the inverter and controller which is based on the Memo bus RTU communication protocol and utilized theRS-485 port while the data being transported. By Considering this kind of inverter's distribution, this paper puts forward a method which is based on dividing by functional data block, able to sequence rankly criterion of the function data block, and able to transport date block divided by the function, thereby, this method decreases the redundancy enormously, elevates the system response speed, and solves the technical problem of controller PID output port's real time remote control to multiple inverters.

Sign in / Sign up

Export Citation Format

Share Document