>I am interested in setting up a TS-7260 for asset tracking using GPS
>and WiFi. I don't need high accuracy for the GPS, a few meters will
>do fine.
If I remember correctly, "a few meters" is high accuracy. If you are in
the US, the WAAS (Wide Area Augmentation System) signal should get you
within 3 meters 95% of the time. WAAS is the same general idea as DGPS,
but the correction data comes from a geostationary satellite instead of
an earth based transmitter.
As far as I know, WAAS only works in the US because that is the only
place where there are ground stations that collect the correction data
and feed it to the WAAS satellites. If you are not close enough to any
of the ground stations, the GPS receiver will not have useful correction
data and so will perform as well as a non-WAAS reciver. I think that
is within 15 meters 95% of the time.
A GPS receiver that is WAAS-capable will collect the correction data
through the same antenna that it receives the GPS satellite data from.
A device that is DGPS-capable will need an additional low frequecy
receiver that passes the DGPS data to your GPS via a serial port.
If you're looking for inexpensive, this is probably not your first
choice.
>What is the easiest/cheapest route to go for adding a GPS? A 'mouse'
>type USB GPS with magnetic mount seems like the way to go as the PC/104
>variety seem a little pricey by comparison.
>
>Does anyone have an out-of-box experience with a GPS and TS-7260?
I used a Garmin GPS-15 with a Rabbit module. It's not exactly a 7260,
but since the interface is a 4800 bps serial port sending printable
text, the difference is pretty insignificant. If you can do serial
communication and string manipulation, you have everything you need.
Garmin makes a bunch of small-module GPS receivers. I chose the
8-24(?) volt version with RS232, but I think there was also a variant
that worked from regulated 3.3 volts and used LVTTL for the serial port.
If you need updates more frequently than once per second, you can get
modules that do that too, but they cost more.
This is not to say that I particularly recommend Garmin -- that's just
the one I chose a few years ago.
I think easiest is to use a GPS that speaks NMEA 0183. This is a
standard, but you can also find modules that speak various proprietary
protocols. Garmin's module has a proprietary protocol, but you get it
by sending and NMEA 0183 sentence asking for it. Some modules default
to the proprietary system and require a command to switch to NMEA mode.
I wouldn't want one of those. As long as you stick with the standard,
you aren't coding to a particular manufacturer or particular model number.
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