[aprssig] APRS vs. SPOT
jgorkos at gmail.com
Thu Sep 8 07:35:42 CDT 2011
On 09/07/2011 05:35 PM, jjesson at voyager.net wrote:
> From my ~10 years of designing-in commercial satellite/cellular
> tracking and telematics systems:
> SPOT technology originally was designed by Axonn's then CTO and this
> technology is based on simplex protocol talking to Globalstar....
> protocol is interesting as it chips between Globalstar's native CDMA
> duplex protocol (native to Globalstar). Their form of simplex is also
> known as send-and-pray as not an ARQ protocol with Simplex... but a
> form of repeat packet transmissions improve the odds of correctly
> receiving packets and this is a setting in their engineering
> configuration tool.
Just out of off-list curiosity, who was Axxon's CTO? There were a slew
of super smart guys working there.
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