tracking police gps

geoff897 · 02-21-2004, 01:30 AM

hi
i wondering cos police have gps's in them if you have gps can you find there frequency and find where they are??

jjh221 · 02-21-2004, 01:33 AM

any reason why you want to know?

tyronepatterson · 02-21-2004, 01:43 AM

This is too freakin funny ;-) heeeeyaaaaa

cproaudio · 02-21-2004, 02:30 AM

Quote: Originally Posted by geoff897

hi
i wondering cos police have gps's in them if you have gps can you find there frequency and find where they are??

GPS receives signal. It doesnt broadcast signal. There's no way to locate a cop car or anything that has GPS onboard. It has to broadcast it's position into the airwave. GPS receivers dont broadcast. Why do you think it's so hard to find ways to locate your vehicle?

CoCa · 02-21-2004, 03:17 AM

I've been wondering the exact same thing for awhile now. I know there are many a site that sell GPS fleet tracking units. It seems one would merely need the software and wahtever codes are assigned to the units. Would be alot o fun if you could do it in real time.

geoff897 · 02-21-2004, 03:45 AM

so how do police cars get found if stolen

droswell · 02-21-2004, 06:04 AM

I'm guessing they use radio to burst their position. The GPS reciever sends the coordinates to some sort of transmitter, and if you can just capture that signal and decode, you could display on your mapping software. May be encrypted, but I've been thinking about this for a few months. If I get get my hands on a scanner and some equipment, I can check the police channels in my area...

storm · 02-21-2004, 06:35 AM

In sweden the policestation knows where the plolicecars are via somekind of gps-tracking system. So there must be a way to track that signal.
I've been thinking about this before, it would be so cool!

hijinks21 · 02-21-2004, 07:33 AM

no he's not all that crazy.. there are a lot of departments that track a cops location via some kind of transfer based off GPS

mmendis · 02-21-2004, 08:03 AM

Quote: Originally Posted by droswell

I'm guessing they use radio to burst their position. The GPS reciever sends the coordinates to some sort of transmitter, and if you can just capture that signal and decode, you could display on your mapping software. May be encrypted, but I've been thinking about this for a few months. If I get get my hands on a scanner and some equipment, I can check the police channels in my area...

I think you might be right about transmitting over the radio, but my guess it that it wouldn't be encrypted. It would cost to encrpyt (hardware/software) would overrate the need (not sensitive data). But I could be wrong.

nadir_s · 02-21-2004, 09:57 AM

they most likely have transponders on them... kinda like planes.

Altimat · 02-21-2004, 10:57 AM

Yup the company I work for wants to track their field service vehicles with the same GPS tracking units. They transmit the GPS coordinates of each vehicle back to a receiver.

jnusaira · 02-21-2004, 11:01 AM

Their used to be this radio/detector called i believe Bearclaw ... or something like that .... and you could input police frequencies into it .... and it would detect if someone was getting close to that area.

My friend bought it ... i odnt think he liked it very much .. but thats the only thing closest to what you want.

jnusaira · 02-21-2004, 11:05 AM

http://cgi.ebay.com/ws/eBayISAPI.dll...category=14935

Here is it ... UNIDEN BEARTRACKER BCT-12 Mobile Scanner
Again i make no claims how well it works

Falken · 02-21-2004, 11:17 AM

Quote: Originally Posted by geoff897

hi
i wondering cos police have gps's in them if you have gps can you find there frequency and find where they are??

Tracker actually consist of two components in the car. GPS is used to get the position. A transmitter of some form or another then sends that position back to the tracking station.
Most commercial systems (including our VTU ) transfer the data by using mobile phone technology. With our system you make a data call to the tracking device from the supplied software. This returns the lat/long and the units position is displayed on street level maps on your pc.