scholarly journals Development of a Robotic Wireless Network for Underground Mine Rescue

2021 ◽  
Author(s):  
◽  
Jeffrey Wu
Keyword(s):  
Wireless Network ◽  
Video Compression ◽  
Communication Systems ◽  
Ad Hoc ◽  
Video Stream ◽  
Base Station ◽  
Video Data ◽  
Sensor Data ◽  
Time Compression ◽  
Post Disaster

<p>HADES is a mine scout robot designed to be deployed by first responders to assess mine conditions post-disaster. HADES requires the capability of wireless communication between HADES and the operators on the surface station. Post-disaster mine conditions pose significant challenges to communication systems. This thesis discusses a wireless solution using 802.11b ad-hoc radios. The system developed in this thesis, named HERMES, comprises of the node system RF electronics, internal firmware, and ROS interface to the endpoints. A node design is developed in conjunction with a 2.4 GHz radio module capable of transmitting basic video data. The wireless HERMES nodes are stacked in the HADES robot and deployed as the robot traverses the mine. These wireless nodes are operable for at least 8 hours and have a range of 80 m. The wireless network formed by HERMES allows both video data and sensor data to return to a base station outside the mine. A bespoke decimation in time compression video compression strategy is implemented which provides a basic monochrome video stream with 320 x 240 resolution. This enables video to be streamed through the HERMES network with an overall through-put of 160 kbps on the application level. This basic compression is investigated and evaluated and a video stream with a peak refresh-rate of 40 frames per second with an 800 millisecond response delay is achieved.</p>

scholarly journals Development of a Robotic Wireless Network for Underground Mine Rescue

2021 ◽  
Author(s):  
◽  
Jeffrey Wu
Keyword(s):  
Wireless Network ◽  
Video Compression ◽  
Communication Systems ◽  
Ad Hoc ◽  
Video Stream ◽  
Base Station ◽  
Video Data ◽  
Sensor Data ◽  
Time Compression ◽  
Post Disaster

<p>HADES is a mine scout robot designed to be deployed by first responders to assess mine conditions post-disaster. HADES requires the capability of wireless communication between HADES and the operators on the surface station. Post-disaster mine conditions pose significant challenges to communication systems. This thesis discusses a wireless solution using 802.11b ad-hoc radios. The system developed in this thesis, named HERMES, comprises of the node system RF electronics, internal firmware, and ROS interface to the endpoints. A node design is developed in conjunction with a 2.4 GHz radio module capable of transmitting basic video data. The wireless HERMES nodes are stacked in the HADES robot and deployed as the robot traverses the mine. These wireless nodes are operable for at least 8 hours and have a range of 80 m. The wireless network formed by HERMES allows both video data and sensor data to return to a base station outside the mine. A bespoke decimation in time compression video compression strategy is implemented which provides a basic monochrome video stream with 320 x 240 resolution. This enables video to be streamed through the HERMES network with an overall through-put of 160 kbps on the application level. This basic compression is investigated and evaluated and a video stream with a peak refresh-rate of 40 frames per second with an 800 millisecond response delay is achieved.</p>

The SWARMs Approach to Integration of Underwater and Overwater Communication Sub-Networks and Integration of Heterogeneous Underwater Communication Systems

2018 ◽  
Author(s):  
Francesco Pacini ◽  
Giacomo Paoli ◽  
Iván Cayón ◽  
Tamara Rivera ◽  
Beatriz Sarmiento ◽  
...  
Keyword(s):  
Communication Network ◽  
Communication Systems ◽  
Ad Hoc ◽  
Data Transfer ◽  
Underwater Vehicles ◽  
Variable Number ◽  
Sensor Data ◽  
Radio Communication ◽  
Transfer Rates ◽  
And Control

The management of a heterogeneous mix of underwater vehicles needs a robust and reliable communication network, able to connect the remote command and control station (typically ashore or on board of a support ship) with nodes and vehicles in the deep sea. On the basis of this scenario, the infrastructure shall satisfy requirements such as: medium to extremely long distances between the control room and the area of operation; management of a variable number and type of nodes and vehicles (mobile, fixed, underwater, surfaced); a guaranteed bandwidth to send commands and receive platform status and tasks execution information with minimum latency; a high bitrate to transfer sensor data, pictures and videos in “near real time”; etc. Compared to the available solutions used nowadays for radio communication systems, the underwater environment imposes several constraints on the maximum achievable bandwidth and distance, drastically reducing data transfer rates. This means that the full communication network is a trade-off between different requirements and performances. The SWARMs project approach to this problem is to select, combine and integrate different and heterogeneous communication technologies, components and solutions, in order to obtain the best performances for the management and control of underwater vehicles during the execution of different missions and tasks. The network is mainly based on commercial components, but specific adaptations were made in order to fulfil the requirements of ad hoc underwater and overwater sub networks in maritime specific scenarios. Several experiments and sea trials have allowed the verification of the performance of the full network and the optimization of its configuration according to the mission needs.

The AS' Property and Policy of MANET Structure Tourism Network

2013 ◽  
Vol 347-350 ◽  
pp. 2677-2681
Author(s):  
Qin Yuan ◽  
Yong Wang
Keyword(s):  
Wireless Network ◽  
Ad Hoc Network ◽  
Ad Hoc ◽  
Mobile Ad Hoc Network ◽  
Base Station ◽  
Self Organized ◽  
Autonomous Network ◽  
Mobile Ad Hoc ◽  
The Difference

MANET(mobile ad-hoc network) is an independent NET AS SYSTEM, which has much difference with wired network. It does not depend on fixed main network ( but can be cooperated with main network). This article puts forward a kind of ASN structure during the design of MANET Tourism Network. So it solves the inadaptability between the net segmentation and combination in the MANET from wired ASN. It proves this MBGP can guarantee net MANET QQS in a simulated way.MANET is a kind of communication net with no central structure, which is contrary to the traditional wireless network with base station. It is also called self-organized net. The difference between MANET and wired autonomous network is that MANET gateway BGP agreement is very different from BGP agreement of wired autonomous network.

A Framework for High-Speed Passenger Train Wireless Network Radio Evaluations

2019 ◽  
Author(s):  
Subharthi Banerjee ◽  
Michael Hempel ◽  
Naji Albakay ◽  
Pejman Ghasemzadeh ◽  
Hamid Sharif
Keyword(s):  
Wireless Network ◽  
Network Architecture ◽  
Communication Systems ◽  
High Speed ◽  
Network Performance ◽  
The United States ◽  
Base Station ◽  
Simulation Framework ◽  
Passenger Train ◽  
Past Experiences

By 2030, the United States Federal Transit Administration (FTA) plans to have High Speed Train (HST) systems deployed that span over 12,000 miles across the US. Given the rapidly accelerating growth in consumers demand for fast on-board Internet services, there is a need for a robust and dedicated railroad wireless network architecture for their onboard and Train-to-Ground (T2G) communication systems. And while there are several potential candidates for radio access technologies (RAT), a full understanding of the benefits and drawbacks of each is still missing. We therefore have developed and studied a simulation framework that offers railroads the ability to perform an in-depth evaluation of capabilities for different RATs in terms of interoperability, throughput, handover and bit error rate for various user-driven scenarios. The framework is capable of studying and analyzing conditions such as network performance at different train velocities, base station spacing requirements, as well as analyzing US-specific geographical or track-related architectural scenarios. Our Past experiences in researching railroad wireless solutions have shown that wireless network performance varies widely in environments like tunnels, viaducts, bridges, stations, etc. The simulator offers the network designers significant flexibility in terms of defining parameters to create simulation scenarios and obtaining a detailed understanding of network performance. The work has created a novel, flexible and adaptable simulation framework for high-speed passenger train wireless network evaluation. The simulation tool supports 220MHz-100GHz systems for simulating LTE and 5G-New Radio (5G-NR), and it can support other technologies such as 220MHz PTC, in a time-variant channel. In this paper we present the architecture and the capabilities of the simulator with a sample scenario evaluation. The developed framework aims to support HST wireless communication designers to conduct more detailed analyses and to make more informed decisions in optimizing system deployments.

Model for Wireless Base Station Goodput Evaluation in Vehicular Communication Systems

1970 ◽  
Vol 111 (5) ◽  
pp. 19-22
Author(s):  
A. Ipatovs ◽  
E. Petersons ◽  
J. Jansons
Keyword(s):  
Wireless Network ◽  
Mobile Networks ◽  
Communication Systems ◽  
Access Point ◽  
Base Station ◽  
Traffic Model ◽  
Vehicle Speed ◽  
Vehicular Communication ◽  
Point Model ◽  
Wireless Mobile

In this paper we present the model of wireless base station goodput evaluation. There was used access point model as queuing system with different kind of requests and cycling auto traffic model. Wireless mobile networks have different parameters, such as client stations distance to access point, number of clients in wireless network range, vehicle speed and traffic type. These parameters were analyzed and presented in this paper. Ill. 5, bibl. 17 (in English; abstracts in English and Lithuanian).http://dx.doi.org/10.5755/j01.eee.111.5.348

scholarly journals DEVELOPMENT OF AN ADVANCED METHOD OF VIDEO INFORMATION RESOURCE COMPRESSION IN NAVIGATION AND TRAFFIC CONTROL SYSTEMS

2020 ◽  
Vol 5 ◽  
pp. 31-42
Author(s):  
Serhii Yevseiev ◽  
Ahmed Abdalla ◽  
Serhii Osiievskyi ◽  
Volodymyr Larin ◽  
Mykhailo Lytvynenko
Keyword(s):  
Video Compression ◽  
Communication Systems ◽  
Information Technologies ◽  
Video Data ◽  
Information Resource ◽  
Specific Information ◽  
Surveillance Systems ◽  
Information Compression ◽  
Video Information ◽  
Onboard Equipment

The Earth's aerospace monitoring (ASM) systems use state-of-the-art integrated information technologies that include radio-based detection and surveillance systems using telecommunications. One of the main tasks of ASM systems is to increase the efficiency of decision-making necessary for the timely prevention, detection, localization and elimination of crisis situations and their probable consequences. Modern conditions impose stricter requirements for efficiency, reliability and quality of the provided video data. To ensure compliance with the requirements, it is necessary to provide the appropriate capabilities of the onboard equipment. On the basis of the existing information and communication systems it is necessary to carry out: continuous or periodic assessment of a condition of objects of supervision and control; continuous (operational) collection, reception, transmission, processing, analysis and display of information resources. It is proposed to use UAVs (unmanned aerial vehicles) as a means to perform ASM tasks. The time of organizing communication sessions and delivery of information should vary from a few seconds to 2.5 hours. Untimely processing and delivery of a specific information resource in the management process leads to its obsolescence or loss of relevance, which contributes to erroneous decisions. One way to reduce time is to encode the data. To do this, it is proposed to use video compression algorithms. However, based on the analysis of the possibility of modern methods of video information compression, taking into account the specifics of the onboard equipment of the UAV, the coding problem is not completely solved. The research results show the expediency of using an improved method of video information compression to reduce the computing resources of the software and hardware complex of the onboard UAV equipment and to ensure the requirements for efficiency and reliability of data in modern threats to ASM systems as a whole.

scholarly journals Towards Developing a Teleoperation System for a Disaster Response Robot

2021 ◽  
Vol 102 ◽  
pp. 04005
Author(s):  
Udaka A. Manawadu ◽  
Hiroaki Ogawa ◽  
Keito Shishiki ◽  
Yuki Funayama ◽  
Hiroto Sasaki ◽  
...  
Keyword(s):  
Disaster Response ◽  
Video Stream ◽  
Robotic System ◽  
Video Data ◽  
Sensor Data ◽  
Test Field ◽  
Cloud Data ◽  
Depth Data ◽  
Feedback Data ◽  
The University

Standard Disaster Robotics Challenge of World Robot Summit (WRS) aims to test the ability of robots that can be used as disaster response robots. Robot Engineering Lab of the University of Aizu is developing a robotic system to address challenges in the WRS. The competition has five stages, and the teleoperation robotic system had to be developed to satisfy the requirements of each challenge. REL uses a disaster-response robot called Giraffe, which has the capability of traveling in hard terrain. Open Robot Technology Middleware uses to integrate all of the subsystems inside the robot. Each subsystem has different tasks that process video data, RGB depth data, Point Cloud Data, sensor data and, feedback data. The Robotic system includes 6 cameras and NDI Software Developer Kit used to transmit and view video streams remotely. The video stream from each camera can be viewed separately, and it gives wider control over the robot for the operator. The teleoperation robotic system was tested during a robot demonstration held in Fukushima Robot Test Field, and results were analyzed according to the WRS 2018 competition guidelines. The results were at an acceptable level.

Performance Comparison of MANET, VANET and FANET

2018 ◽  
Vol 8 (5) ◽  
pp. 132
Author(s):  
Aarti Sahu ◽  
Laxmi Shrivastava
Keyword(s):  
Fuzzy Logic ◽  
Wireless Network ◽  
Packet Loss ◽  
Ad Hoc Network ◽  
Fuzzy Logic Controller ◽  
Ad Hoc ◽  
Mobile Ad Hoc Network ◽  
Performance Comparison ◽  
Fuzzy Rules ◽  
Mobile Ad Hoc

A wireless ad hoc network is a decentralized kind of wireless network. It is a kind of temporary Computer-to-Computer connection. It is a spontaneous network which includes mobile ad-hoc network (MANET), vehicular ad-hoc network (VANET) and Flying ad-hoc network (FANET). Mobile Ad Hoc Network (MANET) is a temporary network that can be dynamically formed to exchange information by wireless nodes or routers which may be mobile. A VANET is a sub form of MANET. It is an technology that uses vehicles as nodes in a network to make a mobile network. FANET is an ad-hoc network of flying nodes. They can fly independently or can be operated distantly. In this research paper Fuzzy based control approaches in wireless network detects & avoids congestion by developing the ad-hoc fuzzy rules as well as membership functions.In this concept, two parameters have been used as: a) Channel load b) The size of queue within intermediate nodes. These parameters constitute the input to Fuzzy logic controller. The output of Fuzzy logic control (sending rate) derives from the conjunction with Fuzzy Rules Base. The parameter used input channel load, queue length which are produce the sending rate output in fuzzy logic. This fuzzy value has been used to compare the MANET, FANET and VANET in terms of the parameters Throughput, packet loss ratio, end to end delay. The simulation results reveal that usage of Qual Net 6.1 simulator has reduced packet-loss in MANET with comparing of VANET and FANET.

Comparison of Packet Delivery Fraction of On-demand Routing Protocol based on different Terrain-Area in MANET

2017 ◽  
Vol MCSP2017 (01) ◽  
pp. 38-41
Author(s):  
Hari Shankar Sahu ◽  
Rupanita Das
Keyword(s):  
Wireless Network ◽  
Routing Protocol ◽  
Rapid Growth ◽  
Ad Hoc Network ◽  
Ad Hoc ◽  
Wireless Ad Hoc Network ◽  
Packet Delivery ◽  
On Demand ◽  
Telecommunication Technology ◽  
Demand Routing

Now a days telecommunication technology leads to a rapid growth of number of users, these number of users nothing but number of nodes in MANET.A wireless ad hoc network is a decentralized type of wireless network. The mobility of nodes effect on the performance of the network. Due to mobility of nodes the link breaks number of times which effect on the packet delivery. Therefore to analyze the performance, packet delivery fraction (PDF)can be used. This paper describe the packet delivery fraction of on demand routing protocol AODV and DSR on different terrain areas using GLOMOSIM.

Sign in / Sign up

Export Citation Format

Share Document