Bardzo szybko dostałem odpowiedzi:
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- Can you write something more about these 300 kb of downlink? Will photos be included in this downlink budget or not? The 300 kb estimate (again, I have to stress that it is an estimate) would be just for experiment data. Pictures would be in addition to the 300kb.
- Are you going to use any data compression between sending downlinking the data? If not, perhaps it is an idea for onboard experiment? Yes, there is compression: a lightweight version of LZOP is used.
- How is the data transmission between arduinos and comm subsystem happen onboard ArduSat? All subsystems are on a network stack running the CubeSat Space Protocol (
https://github.com/GomSpace/libcsp) and are addressable, the communication system acts as a router. As a ground-station, you can see all the subsystem nodes through the router transparently, as if you were talking to them directly.
One of these subsystems is the ardusat supervisor node, which in turn communicates with the experiment nodes. The experiment nodes send their data to the supervisor which stores the data on an SD card. These files can then be accessed from a groundstation through the router.
- Will it be possible to re-upload the code if we think that the previously uploaded code does not work?Within reason, yes. We want to do as much testing before hand as possible, since the upload bandwidth is also limited, but the whole point of the satellite is to get you guys working in space, so if the code needs to be replaced, it can be done.
- Will there be access to real-time clock onboard ardusat? Yes, there is a real-time clock that you will have access to.