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Title: Evaluation and deployment of the cricket indoor positioning sensor
Authors: Pathiyil Lakshmi.
Keywords: DRNTU::Engineering::Mechanical engineering
Issue Date: 2009
Abstract: Location aware devices and applications let users view and interact with location dependent resources and information. Over the past decade global positioning system(GPS) enabled applications with access to specialized geographic databases have had a significant impact on military operations, civilian navigation and surveying, supply chain management, aerial photography and in many other outdoor settings. The outdoor location technologies such as GPS have signal structure and signal power levels that are unsuitable for indoor applications. Indoor environments provides opportunities for a rich set of location - aware applications such as navigation tools for robots and humans, interactive virtual games, resource discovery, location - aware sensor networking, asset tracking .Typically indoor applications require better accuracy compared to outdoor location system. This means while using outdoor systems like global positioning system the accuracy in location estimation could be in meters and while using indoor positioning systems the accuracy should be in centimeter range. The main challenge in indoor location systems is environmental factors like humidity, temperature and pressure and noises from other applications inside the laboratory. This project work evaluates and selects suitable deployment topology for Cricket indoor positioning system. "Cricket" is an indoor locationsupport system developed by Massachusetts Institute of Technology. The Cricket system consists of location beacons that are attached to the ceiling of a building, and receivers as called listeners, which are attached to devices that need to be located. Each beacon periodically transmits its location information in an RF message and at the same time it also transmits an ultrasonic signal. Cricket uses time-difference-of-arrival of signal method for distance estimation and the advantage is that different travel times of signals from a target to spatially separated sensor locations.
Description: 107 p.
Rights: Nanyang Technological University
Fulltext Permission: restricted
Fulltext Availability: With Fulltext
Appears in Collections:MAE Theses

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