Wireless Networks LS-1 GROUP -40 BY V. RAJIV -2015A7PS131H TILAK M-2015A7PS121H SOHAM M-2015AAPS267H

Wireless? A wireless LAN or WLAN is a wireless local area network that uses radio waves as its carrier. The last link with the users is wireless, to give a network connection to all users in a building or campus. The backbone network usually uses cables

How do wireless LANs work? Wireless LANs operate in almost the same way as wired LANs, using the same networking protocols and supporting the most of the same applications.

How are WLANs Different? They use specialized physical and data link protocols They integrate into existing networks through access points which provide a bridging function They let you stay connected as you roam from one coverage area to another They have unique security considerations They have specific interoperability requirements They require different hardware They offer performance that differs from wired LANs.

Physical and Data Link Layers Physical Layer: The wireless NIC takes frames of data from the link layer, scrambles the data in a predetermined way, then uses the modified data stream to modulate a radio carrier signal. Data Link Layer: Uses Carriers-Sense-Multiple-Access with Collision Avoidance (CSMA/CA).

Integration With Existing Networks Wireless Access Points (APs) - a small device that bridges wireless traffic to your network. Most access points bridge wireless LANs into Ethernet networks, but Token-Ring options are available as well.

Hardware PC Card, either with integral antenna or with external antenna/RF module. ISA Card with external antenna connected by cable. Handheld terminals Access points

Applications 1) GPS based navigation 2) Low earth Orbit satellites 3) Sensor networks 4) Military uses

FIRST PROTOTYPE

AUTONOMOUS SURFACE VEHICLES SOHAM MUKHERJEE ID:2015AAPS267H GROUP 40

INTRODUCTION  Climate change,now more than ever,is hard to ignore.  The increase in temperature has many negative environmental impacts,one of such is increased storm severity.  Such environmental abnormalities are forcing scientists to look at our ocean for explanations and preventive measures.  While there are many ocean monitoring systems currently in place,ASVs is one such widely popular.  Autonomous Surface Vehicles is an oceangoing vessel capable of navigating and performing tasks without control or assistance of human user.

BACKGROUND  ASVs can range in complexity but must include four main elements-a body(hull),a propulsion system,a navigation system and a data collection and transmission system.  ASVs are a relatively new technology,and it was earlier designed for educational purposes by MIT Sea Grant program and the preliminary prototype was named ARTEMIS.  ARTEMIS was designed mainly for testing navigation and control systems for potential future ASVs.

APPLICATIONS OF ASVS Applications can be sorted into two categories: ENVIRONMENTAL MONITORING TASK PERFORMANCE

APPLICATIONS OF ASVs Applications of environmental monitoring:  Wind speed  Fish tracking  Water depth  Photographic observation  Pollution measurements  Oil spill measurements  Wave height  Barometric pressure  Underwater acoustics,etc. Applications of Task Performance:  Defence related tasks  Transportation  Boat traffic markers  Hazard clean up  Oil sample collection  Beacon transmission  Fish tracking

RECOMMENDATIONS (FOR ADVANCEMENT OF ASV APPLICATION)  Devoloping legal standards for ASVs and regulations for their deployment  Investigating and developing system standards.  Exploring a system to share ASV data between organisations.

CONCLUSIONS If some hurdles can be overcome,we believe tremendous oppurtunity exists for modular and customised ASVs. The capacity of ASV to be used for ocean monitoring and task performance will serve to improve our understanding of the oceans,which will in turn benefit the interaction between society and environment.