cellular geo location final

8/3/2019 Cellular Geo Location Final

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K.Deepkar Reddy(08x81a0406)


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Contents.

Introduction.

Need for geolocation.

Technologies used for geolocation.

Mobile tracking.

Mobile positioning.

Applications.


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Includes plurality of transmit and receivestations

Tracking stations have GPS receiver, radiodirection finder, two way communication system,a computer.

Major challenge is in creating acceptableperformance when the direct path from thetransmitter is intermittently blocked.

Introduction


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Includes several Base stations T1 to TN, aBase station Controller (BSC).

Service area is divided into several

coverage area having respective basestations-Cells.


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Need For GeoLocation.

Personalize mobile services.

Allow the n/w operators to facilitates new servicesto the mobile users

Services:

y Emergency service for subscriber safety

y Location sensitive billing

y Cellular fraud detection

y Intelligent transport s/m services

y Efficient & effective n/w performance and

management


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Technologies Used For Geolocation.

Handset Based Mobile Positioning And Tracking.

GPS.

Mobile can be located by a mobile itself or through a mobiletelecommunication network.

To locate by itself mobile should be provided with a GPSreceiver .

Demerits.

Increases the price and size.

Load is increased.

Power consumption is high.


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Global Positioning system.


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Distance Based Positioning.

Time Of Arrival [TOA].

Calculates the distance b/w mobile and BS based on TOA.

Ri = C i = sqrt ( (xi X ) 2 + (yi Y) 2 )

Where,

C Propagation speed of electromagnetic wave,

i propagation of time from the mobile telephone

to ith base station,

xi, yi location of ith base

station,

X, Y mobile position.


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Time Difference Of Arrival [TDOA].

Also known as multilateration or hyperbolic positioning.

Process of locating an object by computing the TDOA of asignal emitted from that object to three or more receivers.


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Mobile Tracking

Must emit at least the roaming signal. Do notrequire an active call.

GSM localisation by Multilateration.

Cell tower listen for signal send from phone

Negotiate the best tower which is able tocommunicate with the phone.

Technology is based on measuring power levelsand antenna patterns.

Advanced system determine the sector in which themobile phone resides. And also the distance to the

base stn.


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Mobile Positioning.

Localization and tracking are now stepped over byPositioning. GPS.

Can determine which direction one is travelling.

GPS, only fully functional global navigation satellitesystem.

Location based service that discloses the actual

coordinates of a mobile phone. Location Based Systems.

Network Based.

Handset Based.

Hybrid.


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Network Based.

Utilize the service providers infrastructure toidentify the location of the handset.

Can be implemented non-intrusively.

Accuracy varies, least for cell identification andmost accurate for triangulation.

Accuracy dependent on conc. of base station cells.

Must work closely with service provider.


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Handset Based.

Requires the installation of client software on thehandset.

Determines the location by, cell identification,

signal strength of the home and neighbouring cells.

Requires the active cooperation of the mobilesubscriber as well as software.

Hybrid Based.

Combination of n/w based and handset based technologies.

Best accuracy of the three.


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Applications.

Multilateration is commonly used in civil andmilitary surveillance to accurately locate an aircraft,vehicle or stationary emitter by measuring the timedifference of arrival of a signal from the emitter atthree or more receiver sites.

Mobile positioning technology has become animportant area of research for emergency as wellas for commercial services.

Provides several services such as locating stolenmobiles, emergency calls, different billing tariffsdepending on where the call is originated.


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Conclusion.

Proposal is advantageous in that the location of amobile telephone can be accurately tracked even inthe multi-path fading and the NLOS environment, byusing more accurate tracking curves connecting the

intersection points among circles with the radii beingthe distances between corresponding BSs and themobile telephone in a cellular mobile communicationsystem. We have described about accuratepositioning of mobile telephones, which can be usedfor several applications. The importantconsiderations to be undertaken while selecting alocation based technology are location accuracy,implementation cost, reliability, increasingfunctionality.


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Reference

www.ieeexplore.ieee.org

gp.espacenet.com

wikipedia.com


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cellular geo location final

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