Today i want to post a computer project which is very much used for 3rd and 4th year engineering students. Also used for M.C.A students. This is my collection only through internet not mine.
Horus: A WLAN based Indoor Location Determination System (Computer Project)
As ubiquitous computing becomes
more popular, the need for context-aware applications increases. The
context of an application refers to the information
that is part of its operating environment. Typically this includes
information such as location, activity of people, and the state of other
devices.
Algorithms and techniques that allow an
application to be aware of the location of a device on a map of the
environment are a prerequisite for many of these applications. Many
systems over the years have tackled the problem of determining and
tracking user position. Examples include GPS, wide-area cellular-based
systems, infraredbased systems, magnetic tracking systems, various
computer vision systems, physical contact systems, and radio frequency
(RF) based systems. Of these, the class of RF-based systems that use an
underlying wireless data network, such as the IEEE 802.11 wireless
network, to estimate user location has gained attention recently,
especially for indoor applications.
RF-based techniques provide more
ubiquitous coverage than other indoor location determination systems and
do not require additional hardware for user location determination,
thereby enhancing the value of the wireless data network. However, using
a wireless network for location determination has the challenge of
dealing with the noisy characteristics of the wireless channel. Current
location determination techniques for the 802.11 wireless networks
suffer from these noisy characteristics, leading to coarse grained
accuracy.
A key feature of current techniques is
the dependence on building a radio map for the area of interest and
using this radio map to infer the user location. Using the radio map to
infer the user location is a computationally intensive process and may
consume the scarce energy resource of the mobile units. The Horus system
is concerned with developing accurate methods for determining the user
location with low computation requirements. Our goal is to build a
location determination system that is capable of determining the user
position with high accuracy, is light enough to be implemented on
energy-constrained devices such as handheld computers, and is scalable
to track a large number of users and to be used with large areas.
We identify different causes of the
wireless channel variations and we develop techniques to handle these
variations. The results show that the Horus system is able to achieve
accuracy significantly better than the current WLAN location
determination systems. Moreover, the number of operations required to
run the algorithm is better than the current systems with more than an
order of magnitude.
Source: University of Maryland
Author: Abdel Azim Yousief Abdel Rehim, Moustafa Amin
