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Big Brother is watching you



 
 
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  #11  
Old September 29th 04, 02:21 AM
John S.
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Actually most of the time, they should be able to find you with more
accuracy than that. Your distance from the BTS is known to +/- about
500 meters from the timing advance. Bearing is +/- 60 degrees. The
closer you are to the BTS, the more accurate the position estimate is


I have done drive testing for AT&T Wireless and they can tell where you are
withing about 3 meters. Testing would indicate that they can tell you the
address that you are sitting in front of and or the distance from the closest
intersection.

Your above explanation is incorrect.

--
John S.
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  #15  
Old September 30th 04, 02:09 PM
John S.
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AT&T is obviously using signal timing, and i doubt it is +/- 3 meters.
I doubt they know the position of their BTS that well!


Well, they know within 3" where the BTS is. The GPS positioning system is very
good.

--
John S.
e-mail responses to - john at kiana dot net
  #19  
Old October 1st 04, 11:46 PM
Elise05
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If the carrier uses signal timing to determine your position, this
would mean that your phone would have to be pinging the tower on a
periodic basis. Is this correct? If so, how often does the phone
trasmit to the tower when in standby mode?

--Eric
  #20  
Old October 2nd 04, 01:19 AM
John S.
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how often does the phone
trasmit to the tower when in standby mode?


The phone does not send anything unless there are several things that happen.

First, if the phone is moved from one cell site to the other, it will identify
itself to the new cell site so that call delivery is quicker.

Second, if the phone is requested by the system to tell the system where it is.


Finally, if the phone is used, it sends information to the system and is
assigned a cell site to talk to.

Otherwise standby is just that - standby (no transmissions of any kind).

--
John S.
e-mail responses to - john at kiana dot net
 




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