ARISSat 1 & Funcube Telemetry Question: DBPSK vs BPSK
Hi All,
Just a quick clarification needed by me on the Telemetry format that is going to be used by ARISSat-1 and Funcube (& I guess the Funcube boards onboard UKube-1...)
Lots of places are referring to it as BPSK1000, but I have seen references claiming it is DBPSK. Can someone clarify if it is Differential BPSK, or "just" plain old BPSK as used before, but at 1000 BPS, rather than 400 ?
Reason for asking is that I have a USRP, and use gnuradio, along with the gnuradio-companion. That has DBPSK blocks built in, but pure BPSK would take a little more work (possibly just routing the output to a loopback soundcard, and then running decoding software)
73s
Iain
On Sun, Feb 6, 2011 at 12:36 PM, Iain Young, G7III g7iii@g7iii.net wrote:
Hi All,
Just a quick clarification needed by me on the Telemetry format that is going to be used by ARISSat-1 and Funcube (& I guess the Funcube boards onboard UKube-1...)
Lots of places are referring to it as BPSK1000, but I have seen references claiming it is DBPSK. Can someone clarify if it is Differential BPSK, or "just" plain old BPSK as used before, but at 1000 BPS, rather than 400 ?
Reason for asking is that I have a USRP, and use gnuradio, along with the gnuradio-companion. That has DBPSK blocks built in, but pure BPSK would take a little more work (possibly just routing the output to a loopback soundcard, and then running decoding software)
Hi Iain,
It is differentially encoded. You can find the specification on Phil KA9Q's website: http://www.ka9q.net/bpsk1000.html He has also made his reference modem available under GPL: http://www.ka9q.net/demod2.tar.bz2
The package contains functional application that can send and receive BPSK1000. What I am still missing is description of the telemetry format, i.e. how to translate the decoded data stream into engineering values. Is there such a document available?
73 Alex OZ9AEC
participants (2)
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Alexandru Csete -
Iain Young, G7III