On 10/13/11, Steve Obbayi <
steve@sobbayi.com> wrote:
> There are two ways of doing this. Although I am not an expert on GSM and BTS
> etc, The solution here is common to
> that which I would commonly use in 2D/3D graphics programming. Hope you
> understand a bit of linear algebra and geometric transformations.
>
> Nways, here goes
>
> 1. The direction doesn't matter, If you can get readings of three or more
> points as zero vectors then you can compute the resulting vectors of the
> location of the device.
> Using two initial zero vectors wont work as your computed results will
> intersect at two possible vectors.
>
> which brings me to the second method
>
> 2. Using your trigonometry skills, you can calculate the the angle between
> the two fixed known points of the BTS and the two possible third points of
> the resulting two triads based on the distance of at least two BTS stations.
> This should get you good reading.
>
> Steve
>
> ----- "Kinuthia Ngugi" <
kinuthia.ngugi@gmail.com> wrote:
>> Am afraid in GSM, the TA and serving cell is as narrow as it can get. You
>> can not hope to have more than half a kilometer precision. Normaly, timing
>> advance goes in units of 550m, so TA 0 means 550m form the BTS, TA 1 means
>> 1..1KM, so and on. Then there is the issue of how wide a cell's coverage
>> is; you could be having a BTS on a hill with an antenna that has a 90deg
>> beamwidth in the far field....that could mean a span of like 10km across
>> that field, so even if the TA tells you are 3km from the BTS, but in which
>> direction? North or South or East? such are the challenges. All the best
>> though.
>>
>>
>> On Mon, Aug 22, 2011 at 10:11 AM, hellen masita <
hellenmasita@hotmail.com
>> > wrote:
>>
>
>
>
>> Hi skunks/skunkettes,
>>
>> in line with an earlier discussion on this being a technical forum...
>>
>> May i call upon your help without monetary gains taking an upper hand????
>> please :)
>>
>>
>>
>> i want to try and create an application for triangulating a mobile phone.
>> i am at a loss on where to start....really!!! so i throw it to the floor.
>>
>> *******************
>> In a GSM network with than one vendor a proprietary software is normally
>> supplied to handle their equipment including the BTS.
>>
>> Mobile phones however send Measurement reports which are standardized.
>>
>> these reports contain the following,
>>
>>
>
> 1. signal level of 6 best neignbours
>> 2. signal quality\level of serving cell
>> 3. the BTS can determine the Timing Advance of the Mobile(The distance
>> (usually a range) the mobile is from the bts) as well as serving cell
>> (Sector)
>>
>> Now, with just the Timing Advance (TA) and Serving cell , i can tell the
>> general direction of a user. however i would like to use the other
>> measurements to narrow down the location
>>
>> *************************
>>
>> The significance of this is that it a network can track a phone that does
>> not have a GPS. it would make phone thefts less bothersome among things.
>>
>> If guys discuss it for a bit, i'm sure i'll find my footing,
>>
>> regards,
>>
>> Hellen
>>
>>
>>
>>
>>
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