Satellite Data Radio Modem Research

Sample telemetry length for SNOX missions was ~85 bytes each message. Estimate 72 hours at 2 msgs per hour = 12kb

GlobalStar

Radios

findmeSPOT Tracker

Self-contained GPS, Batteries and one-way sat modem.
Alexei Karpenko's hacking of the SPOT
Radio Cost: $150 Service Cost: $99/yr

  • -No altitude by default
  • -Data rate is low = 20 min periods?
  • +Can encode telemetry into Lat/lon fields with significant hacking

Orbcomm

Radios

Digi m10

Datasheet PDF
Hardware Reference Manual
Tech Overview and Reference Manual
Radio Cost: $140
Antenna Cost: ~$20: Can make our own 130-150mhz Dipole
Service Cost: ?? Maybe up to $70/month?

  • 1.5A @ 12v TX Burst
  • 60mA @ 12v RX
  • -40C rated
  • + ~45 grams weight

Digi m100

Datasheet PDF
User Manual
Antenna Cost: ~$20: Can make our own 130-150mhz Dipole
Service Cost: ?? Maybe up to $70/month?

  • 1.8A @ 12v TX Burst
  • 95 - 150mA @12v RX
  • -40C rated
  • + Includes a GPS!
  • - Heavier than Digi m10

Data Service

Orbcomm will not directly sell service plans for less than $2500/month. Resellers do sell less. - Reports from customers of high latency, data dropouts of up to a day.

Live Orbcomm Satellite Coverage Map

Ground Station Locations

From: http://www.gmsa.gov/TEXAS/briefs/Worldwide%20AIS%20from%20Space%20ORBCOMM%20-%20Texas%20IV%20-%209-28-10.ppt

Elevations from: http://www.gpsvisualizer.com/elevation

Approximate Ground Station Locations:
Georgia,31.503629,-83.056641,75m
New York,42.55308,-78.925781,275m
Arizona,34.379713,-110.390625,1900m
Washington,47.694974,-120.673828,700m
Curacao,12.178965,-68.961182,0m
Morocco,33.211116,-7.998047,200m
Italy,40.178873,16.611328,100m
South Africa,-25.165173,27.421875,1000m
Kazakhstan,43.261206,78.046875,2000m
Malaysia,3.776559,103.359375,0m
Australia,-35.88905,147.568359,500m
Korea,37.020098,127.617188,175m
Japan,35.675147,140.097656,25m
Brazil,-22.998852,-43.945312,0m
Argentina,-34.379713,-64.775391,250m

Time Critical Decisions

Sells service using 6-byte messaging service. Price is based on number of 6-byte messages transferred. http://www.tcdecisions.com/pricing.htm
P7 (150x6bytes = 900bytes): 14.65/month
P14 (2000x6bytes = 12000byes): 75.46/month
$37 one-time account activation fee (not per radio)
$13 Euro Gateway one-time activation fee paid at setup time (not per radio)
$9 Modem swapout charge when one radio is lost and replaced with the next
Billing is month-to-month, no contract. Pay by check or credit card. Email them when ready to start.
Latency: 15 minutes to 1 hour, ~1 hour is usually when only one of their 4 satellite planes is overhead, usually every 12 weeks. Typically closer to 15 minutes.

Airsis

http://www.airsis.com/ram/contact.asp
Contacted, suggested we use Iridium instead for critical reliability concerns.

Iridium

1.6GHz LEO Satellite network - very low latency messaging.

Radios

Q9602

Detailed info
Radio Cost: $395 from Airsis (quote via C.Morton)

Q9612

Detailed info
Radio Cost: $490 ea

Data Service

First 12KB per month = $30-40 each additional 1kb = $1.50. (Rough quote from Airsis C.Morton)
More reliable than Orbcomm. Lower latency than Orbcomm. Messages sent via email. Minimum billable message: 10 bytes. C.Morton will look into possibly waiving the activation fee when each modem is lost and a new one has to be activated for the next flight.

Antennas

hardware/radio/satellite/research.txt · Last modified: 2011/01/06 02:39 by bradluyster
 
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