Order Tray | Contact Us | Home | SIG Lists

[aprssig] Suggestion for APRS over Satellite

Stephen H. Smith wa8lmf2 at aol.com
Tue Apr 22 07:42:42 UTC 2008


Hans Johnson wrote:
> Hi All,
>
> I've been toying around with the idea of building some equipment for 
> extreme remote telemetry stuff to be done over satellite.  (Similar to 
> Bob's project in Mongolia).
>
> Anyhow, one of the things that would be extremely useful is if the 
> satellite could (occasionally) include its current orbital data in the 
> beacon packet, something like a condensed version of the Two Line 
> Element and a CRC.  Using this information, it could then power down 
> the radio until the next useful satellite pass.  This would 
> drastically reduce the power requirements for a remote site.  Also, 
> things like asatlogger and what not could use the information to 
> update their pass predictions automatically.
>

Won't the remote device then need to have fairly hefty computing power 
to crunch the orbital elements into a useful AOS/LOS prediction for the 
particular location the device is located at?  

I would guess that the power consumption of a controller with enough 
horsepower to do this would exceed the total power consumption of just 
having a much simpler dumber device power up the radio for a few seconds 
every 5 or 10 mins if the transmit bursts are really short. 


Not to mention you will also need to power a receiver that won't be 
needed with a "dumber" device, and a real-time clock to wake up the 
controller/transmitter at the appropriate times.    




--

Stephen H. Smith    wa8lmf (at) aol.com
EchoLink Node:      14400    [Think bottom of the 2M band]
Home Page:          http://wa8lmf.com  --OR--   http://wa8lmf.net

NEW!   World Digipeater Map
  http://wa8lmf.net/APRSmaps

JavAPRS Filter Port 14580 Guide
  http://wa8lmf.net/aprs/JAVaprsFilters.htm

"APRS 101"  Explanation of APRS Path Selection & Digipeating
  http://wa8lmf.net/DigiPaths

Updated "Rev H" APRS            http://wa8lmf.net/aprs
Symbols Set for UI-View,
UIpoint and APRSplus:






More information about the aprssig mailing list