CRL Sweden specialists in Mesh networks, routing algorithms/ protocols, and data dissemination.

Ad Hoc Networks with Unattended Ground Sensors

Thesis for Bachelor of Science degree in Telecommunication.

Awarded the highest prize from the Sparbanksstiftelsen Kronan 2002.
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In this report theories concerning unattended ground sensor networks and ad hoc routing is presented. A description about the development of a testbed for this kind of network is also handled in the report.

Abstract

Low cost, unattended sensors can give great tactical benefits in military situations by using them for searching, recognition and surveillance. A wide spectrum of sensors is suitable for these types of unattended applications. To be able to deploy these sensors without precision or planning, they need to be able to determine their own position and establish communication with each other and the surroundings. A requirement for long lasting operations is low energy consumption. This in turn, gives great emphasis to e.g. the communication system. In addition to this, there is a desire of low probability of recognition of these sensors against outsiders. An elegant solution to these problems is so called ad hoc networks, which can realize infrastructure less radio systems in which data can be forwarded through the nodes without planning and without using a centralized administration. Despite that the nodes can be randomly deployed, there is a desire to be able to control the area of coverage, change the parameters of the sensors, check the status of the sensors, change the software of the sensors and order radio silence.

In this final work, performed at EMW (Ericsson Microwave System AB), we have developed an ad hoc network with GPS-equipped unattended ground sensors that shows interactive functionality with each other, which results in the achievement of a local situation picture. The aim and purpose of this is to test and demonstrate the technology of UGS in ad hoc networks. The starting point has been a WLAN-based ad hoc testbed of EMW, and the choice of sensors has been choused based on what is available today. E.g. the UMRA (an acoustic, seismic and magnetic sensor) from Exensor AB and intelligent cameras from the company of WeSpot. To achieve greater range in the ad hoc network, we have also made us of pure communication nodes to forward the information.

The first section of this thesis provides theories of UGS networks, ad hoc routing and ideas for future development. The resuming sections describe the development of a conceptual testbed.

A presentation for customers over this project has also been completed, in which the advantages of the system can be observed in the surveillance of a fork. The testbed can also be seen at as an environment of development in which fundamental building blocks of NBF (Swedish: Network Based Defense) can be tested. These blocks could be for instance: i) data fusion, distributed or central, ii) flexible solutions of communication, internal and to the surroundings iii) different types of sensors iv) management of - and controlling of the system, and v) user availability.

Intelligent Sensor Networks - an Agent-Oriented Approach (Poster)

Poster submitted by CRL to the workshop realWSN arranged by SICS.

See also all Online-proceedings at SICS homepage.

Abstract

A New Routing Strategy for Mobile Ad Hoc Communication

Submitted for the Degree of Master of Science in Electrical Engineering.

Awarded the highest prize from the Sparbanksstiftelsen Kronan 2004.
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The aim of this thesis was to develop a new routing strategy for mobile ad hoc communication with key features such as utilization of as little computational resources as possible thereby consumed power due to the fact that most wireless devices use batteries and therefore have a limited lifetime. Requirements were set that routes should be established as fast as possible to provide almost instant communication. Stability issues such as link connectivity between intermediate systems were also important during the development.

Abstract

Intelligent Sensor Networks - an Agent-Oriented Approach

Submitted for the Degree of Master of Science in Electrical Engineering.

Awarded the highest prize from the Sparbanksstiftelsen Kronan 2004.
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In this report the abstraction level of the agent oriented approach is investigated for distributed systems. Ideas and concepts concerning data and information fusion are presented and discussed. A testbed of an intelligent ground sensor network is implemented with the intention of investigating agent orientated and gain experience of the maturity of the agent oriented paradigm for dynamic and distributed networks in ad hoc environments. Software agents have been used in an intelligent way to get the units in the network to cooperate and only distribute relevant information.

Abstract