Design and Development of Redeployable Underwater Data Communication Link for Defence Application

2017 ◽  
Vol 68 (1) ◽  
pp. 111
Author(s):  
Arun Kumar ◽  
L. Anjaneyulu
Keyword(s):  
High Speed ◽  
Data Communication ◽  
Video Camera ◽  
Physical Parameters ◽  
Communication Link ◽  
Fibre Optic ◽  
Time Data ◽  
Design And Development ◽  
Design Data ◽  
Fibre Optic Cable

<p class="p1">Testing of underwater system for defence application is carried out from submersible platform at specified depth. The underwater platform houses the article under test, equipment and instruments required to conduct the test and to control the platform. During development phase of defence systems, large numbers of sensors are mounted on the test article and data is collected to validate the design. Data acquisition system, video camera and high speed video cameras are positioned on the platform to record physical parameters and observe visually the performance of the article under evaluation. Since the data and video signals are parallely recorded on ship, the bandwidth demand for real-time data communication from underwater platform to control station is very high. The existing technology presently used for underwater communication has limitation of bandwidth and not suitable for defence application. This paper describes in detail the design and development of a re-deployable data communication link by laying a specially designed negatively buoyant fibre optic cable in high-sea from ship to underwater platform to provide higher bandwidth required for defence application. The link has been successfully used for sea state less than one during evaluation of underwater defence system. The availability of bandwidth from underwater platform to control system can be increased significantly by laying fibre optic cable in high sea. It also provides unlimited bandwidth for the above requirement.<span class="Apple-converted-space"> </span></p>

Broadband Communications for Aircraft in Oceanic and Other Remote Areas

2014 ◽  
Vol 1 (1) ◽  
pp. 51-59
Author(s):  
Stephen John Curran
Keyword(s):  
Video Streaming ◽  
High Speed ◽  
Data Communication ◽  
Data Service ◽  
Fibre Optic ◽  
Technical Challenge ◽  
Data Services ◽  
Remote Areas ◽  
Broadband Communications ◽  
High Speed Data

Data communication with aircraft presents unique technical challenges and these challenges are more pronounced when the aircraft are travelling over oceanic or other remote areas. When in populated areas, systems are available that can support high speed data services, one Gigabit per second (Gbps) and beyond via, terrestrial ground stations. However no such systems exist to provide airborne communications with high bandwidths among aircraft and between aircraft and the ground in more remote regions. Passengers will expect data service on the aircraft similar to what they typically experience on the ground. Multimedia activities, such as video streaming, are very bandwidth intensive and the provision of these services presents a serious technical challenge. On the ground, fibre optic cables are the method of choice for the provision of high speed data service, and in contrast, an airborne high speed data communications solution will need to be a wireless one.

Study and Application of DPRAM Communication Technology in Engraving CNC System

2012 ◽  
Vol 482-484 ◽  
pp. 788-791
Author(s):  
Jian Feng Pan ◽  
Jian Fan ◽  
Jian Feng Xu ◽  
Ying Fang
Keyword(s):  
Real Time ◽  
Communication Technology ◽  
High Speed ◽  
Data Communication ◽  
Pci Bus ◽  
Motion Controller ◽  
Cnc System ◽  
Time Data ◽  
Embedded Pc ◽  
Speed And Accuracy

The motion control system of CNC engraving machine，structured as NC embedded PC , is consists of the NC, a motion controller working as the lower computer, and the IPC, working as the supervisory computer. Both of them perform real time data communication through the PCI bus using DPRAM communication technology. It has many advantages such as consuming less response time, high speed and accuracy and so on. The experiment proves that the CNC system equipped with this technology has sensitive response and good real-time performance and stability.

First Use of ROV Remote Operations from Shore in the Gulf of Mexico

2021 ◽  
Author(s):  
Simao Silva ◽  
Blake Terrell ◽  
Mark Philip ◽  
Nicholas Rouge ◽  
Diogenes Angelidis ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Real Time ◽  
High Speed ◽  
Offshore Platform ◽  
Worker Safety ◽  
Communication Link ◽  
Time Data ◽  
Real Time Data ◽  
Remote Operations ◽  
Operations Center

Abstract Oil and gas companies across the spectrum are moving toward digitalization. Leveraging technology to access real-time data has allowed companies to streamline activities and gain operational efficiencies while at the same time improving worker safety by reducing the number of personnel required offshore. This evolution optimizes operations by enabling better decision-making by subject matter experts (SMEs) located around the world working as one interconnected team. Functions once performed exclusively by offshore personnel are being carried out today by onshore workers via remote technology. By capitalizing on the ability to communicate offshore via high-speed internet, it is now possible to carry out ROV operations using a team that includes onshore based personnel. A recent project illustrates how ROV activities controlled from an onshore remote operations center in Louisiana were carried out successfully on a production Tension Leg Platform (TLP) in the Gulf of Mexico (GoM). The technology used onboard the TLP is not new; operators have been remotely managing a range of functions on offshore assets for years. However, the project does apply this proven approach to ROV piloting operations for the first time commercially in the GoM. Transferring ROV control from the offshore platform to a facility onshore is possible using a communication link that connect real-time data from the offshore asset to the onshore remote operations center (OROC). The two-way communications link provides a redundant system in which controls can be executed either from the offshore platform or from the remote operations center, allowing specialized roles that historically have been executed offshore, including that of the ROV pilot, subsea engineer, and company representative directing the work, to be transferred to a land-based team. The increase in data required from the offshore asset for the GoM project was managed via a dedicated link that provided data transfer at a minimum speed of 3 Mbps upload/download with a fail-safe system that automatically default control to the offshore ROV team in case of any failures in the communication link. Remotely piloting an ROV from shore and coordinating with an offshore crew not only delivered a reduction in HSE exposure but reduced overall personnel costs on the asset by more than 30% for 24 hours of operations. This approach to ROV operations has the potential to reduce costs by reducing the number of workers required offshore even further if additional staff associated exclusively with the project subsea work scope is directed to work remotely from shore.

scholarly journals Data Analysis and Validation of Acquired Temperature Data on Underwater Platform

2018 ◽  
Vol 68 (6) ◽  
pp. 597
Author(s):  
Arun Kumar ◽  
Lokam Anjaneyulu
Keyword(s):  
Temperature Measurement ◽  
Heat Loss ◽  
Test Data ◽  
Data Communication ◽  
Optical Data ◽  
Critical Parameters ◽  
Physical Parameters ◽  
Communication Link ◽  
Measured Temperature ◽  
Exit Velocity

<p class="western" style="margin-left: -2.25cm; margin-bottom: 0.35cm; line-height: 115%;">Underwater missiles are launched from canister by hot gasses produced by a gas generator. Hot gasses eject the missile out of canister, positioned on an underwater platform in high seas at a depth of 50 m to 70 m. During development phase of submarine launched missile, maximum number of physical parameters related to platform and launching mechanism are acquired on a data acquisition system on-board platform and selected critical parameters are transmitted to control station in real time through an optical data communication link. Missile parameters are recorded on-board and transmitted to the control station by delayed transmission technique once the missile is out of water. Exit velocity of missile is very important parameter for the missile trajectory and range, which depends upon the heat loss in canister and annular gap pressure between missile and canister during the ejection process. Prediction of exit velocity is validated by heat loss calculation by measured temperature at different stations during the test. Temperature measurement is carried out by sensors mounted on the inner wall of canister and also by jumping type of temperature sensor, which measures canister gas temperature. In spite of all efforts, few sensors do not work as expected. It is important to measure various parameters according to instrumentation measurement plan. In case of temperature measurement, sometimes, it is required to predict temperature at location, where sensor was originally not mounted. To validate the recorded test data, another set of data is needed for which one has to wait till next test is conducted that may take years and practically impossible to ensure identical test setup and environmental condition. A mathematical approach to predict temperature at required location and to validate the recorded test data is presented.</p><p class="western" style="margin-left: -2.25cm; margin-bottom: 0.35cm; line-height: 115%;"> </p><p class="western" style="margin-left: -2.25cm; margin-bottom: 0.35cm; line-height: 115%;"> </p>

scholarly journals Experimental Application of the Process Industry Solid Particle�s Displacement in a Vertical air Flow

2020 ◽  
Vol 71 (6) ◽  
pp. 9-21
Author(s):  
Mirela Panainte-Lehadus ◽  
Emilian-Florin Mosnegutu ◽  
Valentin Nedeff ◽  
Narcis Barsan ◽  
Dana Chitimus ◽  
...  
Keyword(s):  
Angular Velocity ◽  
Solid Particle ◽  
High Speed ◽  
Average Velocity ◽  
Air Flow ◽  
Experimental Studies ◽  
Video Camera ◽  
Solid Particles ◽  
Physical Parameters ◽  
Software Methodology

In this article some experimental studies were performed in order to analyze some physical parameters specific for a solid particle during displacement in a vertical air flow. The analyzed parameters were the instantaneous average velocity value and the angular velocity value. To determine the two parameters, a laboratory stand was used for the aerodynamic separation of a mixture of solid particles and a high-speed video camera in order to be able to track the behaviour of the studied particles. At the same time, a working methodology has been designed, implying the use of multiple software, i.e. analysis, video, imagistic and date software, methodology that aims to convert a video file, where we have a 2D view, into a 3D interpretation. Following the analysis of the obtained results, we noticed that both the instantaneous average velocity value and the angular velocity value are closely linked to the sphericity of the solid particle, varying inversely proportional to it, and to the air flow velocity, which directly influences the analyzed parameters.

Analysis of Inter-Satellite Optical Wireless Communication System

2017 ◽  
Vol 7 (10) ◽  
pp. 10
Author(s):  
Rajbir Singh
Keyword(s):  
Wireless Communication ◽  
Optical Networks ◽  
Data Transmission ◽  
High Speed ◽  
Open Space ◽  
Communication Link ◽  
Optical Wireless Communication ◽  
Optical Wireless ◽  
High Speed Data ◽  
Speed Data Transmission

Optical networks are bandwidth efficient networks are used for long haul communication providing seamless data transfer. For high speed data transmission in open space between different satellites, Inter-satellite Optical wireless communication (IsOWC) is widely used .In this paper we have evaluated the performance of IsOWC communication link for high speed data transmission .The performance of the system is evaluated on the basis of qualitative parameters such as Q-factor and BER using optisystem simulator.

A 2 × 20 Gbps hybrid MDM-OFDM–based high-altitude platform-to-satellite FSO transmission system

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Vel Murugan Gomathy ◽  
T. V. Paramasivam Sundararajan ◽  
C. Sengodan Boopathi ◽  
Pandiyan Venkatesh Kumar ◽  
Krishnamoorthy Vinoth Kumar ◽  
...  
Keyword(s):  
High Altitude ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Satellite Communication ◽  
Input Power ◽  
Transmission System ◽  
Communication Link ◽  
Space Optics ◽  
High Altitude Platform ◽  
Mode Division Multiplexing

AbstractIn the present study, the application of free space optics (FSO) transmission system to realize a long-reach high-altitude platform (HAP)-to-satellite communication link has been exploited. High-speed information transmission without interference is accomplished using orthogonal frequency division multiplexing (OFDM). Further, the information capacity of the proposed system is increased by employing mode division multiplexing (MDM). We have investigated the proposed MDM-OFDM-HAP-to-satellite FSO transmission system performance over varying FSO range, diameter of the receiver, pointing errors, and input power. Also, an improved transmission performance of the proposed system using a square root module is reported.

An Efficient Match Search Approach Using Two-Dimensional Hash Function in Hardware-Based Dictionary Compression

2019 ◽  
Vol 28 (06) ◽  
pp. 1950106
Author(s):  
Qian Dong ◽  
Bing Li
Keyword(s):  
Compression Ratio ◽  
Hash Function ◽  
High Speed ◽  
Two Dimensional ◽  
Time Data ◽  
Search Result ◽  
Compression Speed ◽  
Real Time Data ◽  
Real Time Data Processing ◽  
Search Approach

The hardware-based dictionary compression is widely adopted for high speed requirement of real-time data processing. Hash function helps to manage large dictionary to improve compression ratio but is prone to collisions, so some phrases in match search result are not true matches. This paper presents a novel match search approach called dual chaining hash refining, which can improve the efficiency of match search. From the experimental results, our method showed obvious advantage in compression speed compared with other approach that utilizes single hash function described in the previous publications.

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