Normally, I decode telemetry live from the satellite and upload it immediately. I have an RTL-SDR attached to my Android phone and use SDRTouch to demodulate the FM signal feeding the headphone out to my laptop running FoxTelem to decode the frames and upload it through my home's Wi-Fi.
However, with the weather turning and the difficultly of getting everything set up, I was wondering if there are any issues with recording the audio or IQ signal on my phone during the pass and feeding it into FoxTelem from my phone later. Does it use my computer's local time or expected to be the live stream, or does it just rely on the time stamp in the decoded packets for ordering the telemetry data whenever it's received?
And on that, if I can decode later, is there a time limit I should follow for decoding older data? If I captured a satellite pass in the morning before leaving for work, but didn't feed it into FoxTelem for decode until the evening when I get back home?
And lastly, I know it's a different group operating it, but I'm curious if it's a similar policy for AO-73, the first FUNcube sat for decoding packets delayed from their capture time.
Thanks for the info! 73s, Loren AG7NC
Hi
FUNcube packets are accepted up to two days after they were received by the dashboard.
We use the sequence number and frame type to determine the ‘satellite time’ since the epoch.
We can use these packets to back fill any missing ones and ‘score’ them for the user.
73
Dave, G4DPZ
Sent from my iPhone
On 9 Oct 2018, at 06:57, Loren M. Lang penguin359@gmail.com wrote:
Normally, I decode telemetry live from the satellite and upload it immediately. I have an RTL-SDR attached to my Android phone and use SDRTouch to demodulate the FM signal feeding the headphone out to my laptop running FoxTelem to decode the frames and upload it through my home's Wi-Fi.
However, with the weather turning and the difficultly of getting everything set up, I was wondering if there are any issues with recording the audio or IQ signal on my phone during the pass and feeding it into FoxTelem from my phone later. Does it use my computer's local time or expected to be the live stream, or does it just rely on the time stamp in the decoded packets for ordering the telemetry data whenever it's received?
And on that, if I can decode later, is there a time limit I should follow for decoding older data? If I captured a satellite pass in the morning before leaving for work, but didn't feed it into FoxTelem for decode until the evening when I get back home?
And lastly, I know it's a different group operating it, but I'm curious if it's a similar policy for AO-73, the first FUNcube sat for decoding packets delayed from their capture time.
Thanks for the info! 73s, Loren AG7NC _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
You can play back a Fox telemetry recording into FoxTelem at any time. The timestamps are written by the spacecraft into the header of the telemetry frame. We slot the data into the data set filling any holes.
We do also store the time stamp from your computer when it was decoded and another when it was received at the server. We use those timestamps to synchronize the clock on the spacecraft back to UTC, by working out what time the on board computer last reset. But that algorithm uses data from a small number of ground stations. We make sure their clock is accurate and they decoded the data real time.
73 Chris
On Wed, Oct 10, 2018 at 1:00 AM David Johnson dave@g4dpz.me.uk wrote:
Hi
FUNcube packets are accepted up to two days after they were received by the dashboard.
We use the sequence number and frame type to determine the ‘satellite time’ since the epoch.
We can use these packets to back fill any missing ones and ‘score’ them for the user.
73
Dave, G4DPZ
Sent from my iPhone
On 9 Oct 2018, at 06:57, Loren M. Lang penguin359@gmail.com wrote:
Normally, I decode telemetry live from the satellite and upload it immediately. I have an RTL-SDR attached to my Android phone and use SDRTouch to demodulate the FM signal feeding the headphone out to my
laptop
running FoxTelem to decode the frames and upload it through my home's
Wi-Fi.
However, with the weather turning and the difficultly of getting
everything
set up, I was wondering if there are any issues with recording the audio
or
IQ signal on my phone during the pass and feeding it into FoxTelem from
my
phone later. Does it use my computer's local time or expected to be the live stream, or does it just rely on the time stamp in the decoded
packets
for ordering the telemetry data whenever it's received?
And on that, if I can decode later, is there a time limit I should follow for decoding older data? If I captured a satellite pass in the morning before leaving for work, but didn't feed it into FoxTelem for decode
until
the evening when I get back home?
And lastly, I know it's a different group operating it, but I'm curious
if
it's a similar policy for AO-73, the first FUNcube sat for decoding
packets
delayed from their capture time.
Thanks for the info! 73s, Loren AG7NC _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership.
Opinions expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
participants (3)
-
Chris Thompson -
David Johnson -
Loren M. Lang