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| Subject: | Re: [gislist] realtime vehicle tracking |
| Date: |
07/07/2005 07:05:02 AM |
| From: |
Tobie |
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Hi, We use normal GSM network to communicate with vehicle GPS and also GPRS.
Tobie
----- Original Message -----
From: "Simmonds, Ashley (DTEI)" <simmonds.ashley@saugov.sa.gov.au>
To: <gislist@lists.thinkburst.com>
Sent: Thursday, July 07, 2005 6:00 AM
Subject: Re: [gislist] realtime vehicle tracking
> thanks for your help with this. basically I don't need all of the crap
> that
> comes with commercial AVL systems... all I want to do is get the X/Y
> coordinates of a vehicle a couple times a day, anywhere in the country
> (australia).
>
> I understand this makes it somewhat difficult as you can basically assume
> (with oz's wide expanses) that this should be trackable planet-wide. as
> long as I can get those X/Y coords ANYWHERE that I can access them, that
> would be sufficient as I have the ability to deal with anything from that
> point on.
>
> downloading the data afterwards is useless to my venture, to clarify this
> is
> for a car fleet of a rental car company, and they don't care where they've
> been, but when one of their cars goes missing for several days they become
> very anxious as to where they ARE. if we could get the coords xmitted a
> couple times a day, they can send 'the boys' out to deal with it.
>
> cheers,
> ash
>
> -----Original Message-----
> From: Bill Diaz [mailto:william.diaz@comcast.net]
> Sent: Tuesday, 5 July 2005 10:26 PM
> To: 'Simmonds, Ashley (DTEI)': gislist@lists.thinkburst.com
> Subject: RE: [gislist] realtime vehicle tracking
>
> Ash,
> See below:
>
>>-----Original Message-----
>>From: gislist-bounces@lists.geocomm.com
>>[mailto:gislist-bounces@lists.geocomm.com] On Behalf Of Simmonds,
>>Ashley (DTEI)
>>Sent: Tuesday, July 05, 2005 03:58
>>To: gislist@lists.thinkburst.com
>>Subject: [gislist] realtime vehicle tracking
>>
>
>>sure this has been discussed before. could someone point some fingers
>>at where some step-by-steps in this arena might be located...
>>
>>i've been researching APRS a bit, and am already good with GIS and
>>stuff, but i need to get a good handle on how to transmit a GPS signal
>>from a fleet of cars, and recieve that signal into my application.
>
> Step by step information for commercial AVL system design is hard to come
> by, since many companies use proprietary systems and methods. Methods of
> transmitting and receiving a signal from a fleet can vary considerably.
> An
> APRS like system may not be suitable for commerical application for a
> variety of reasons.
>
> APRS (Amateur Position Reporting System) is used by Radio Amateurs
> World-Wide to report postions of various mobile and fixed assets.
> However,
> it has some serious drawbacks. Position reports do not require or expect
> an
> ack. There is no way of knowing if the position information reached the
> desired destination. Often, a position report collides with a postion
> report from another station, and both position reports are lost since
> there
> is no retry mechanism for position reports.
>
> Commercial AVL systems generally have robust protocols to ensure
> information
> is delivered to the intended destination or is stored locally for later
> transmission or download.
>
> The key to a successful AVL systems is a dependable communications system
> which covers the intended market area. If the market area is small, a
> single
> base station may suffice and costs can be somewhat reasonable. If the
> market area is larger than can be covered by a single base station, costs
> can quickly escalate. Many AVL systems in the US utilize existing
> cellular
> networks to carry information since the captial costs are mimimal compared
> to a dedicated system. Most networks claim 95% coverage in the US.
> Microburst and Cellemetry offer data services which utilitze the control
> channel of cellular systems to allow subscribers to relay limited amounts
> of
> data. Other commercial services are available as well.
>
> Several AVL systems do not use radio at all. They simply log position
> information into an onboard computer for later download to an AVL system.
> Some are hybrid systems. They store location information until they come
> in
> range of the AVL radio system and then send the stored information.
>
> Asset position information can be sent or stored at regular intervals or
> when specific events occur. If the interval is too short, the amount of
> data can be quite large, especially when traveling long distances. Very
> often the data is somewhat redundant when the vehicle is stationairy.
> Smart
> beaconing or logging can re
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