Hi Mark:
I don't think the SV Messages are related to Over The Air Rekeying (OTAR) since they don't have enough characters. My
guess is that they are a modern form of the Emergency Action Message (EAM).
Here's a screen shot of a DAGR GPS receiver showing the first couple of
messages as of 2 pm pacific time 3/31/2018:
http://www.prc68.com/I/DAGR.shtml#SV_Messages
https://en.wikipedia.org/wiki/Over_the_Air_Rekeying
https://en.wikipedia.org/wiki/Emergency_Action_Message
--
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
-------- Original Message --------
Or on the GPS/GNSS signals... I was verifying Lady Heather's support for the old
SV6/Palisade/Acutime receivers and came across a mention of the "GPS System
Message" command. It is requested by TSIP packet 0x28 and returns packet 0x48.
Newer Trimble receivers (like the Resolution-T don't seem to support the 0x28/0x48
messages. It is only mentioned in the SV6 docs. The system message is a 22 character
ASCII string embedded in the GPS navigation messages.
If you dig into the GPS ICD docs it says it is used like a "bulletin board" for
GPS users and can be a plaintext or encrypted message. They currently seem to be
encrypted... perhaps a way to distribute P-code keys?
I wonder if any of the newer GNSS sats have some hidden goodies in the signals?
When sent to the SV6, you get a single response. When sent to a Thunderbolt,
you get 31 messages (mostly all the same). I think the different messages are
due to delays in the ground control system updating the satellites or the
receiver not tracking particular satellites between updates.
Here a couple of responses from a Thunderbolt:
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:Z9Mx69BOC1 Lx+:LR3X2 Q
# GPS system message:Z9Mx69BOC1 Lx+:LR3X2 Q
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:Z9Mx69BOC1 Lx+:LR3X2 Q
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:X4W-BZXE3/HPU77G49PU1V
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:5FT16X78CN53GVWVF1/8BW
# GPS system message:5FT16X78CN53GVWVF1/8BW
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:5FT16X78CN53GVWVF1/8BW
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
# GPS system message:E:S4.A2'3'A65/C5M8 UQO
----------------
I wonder how many secret services are parasites on the commercial
TV transponders
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