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librecube

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open source space and earth exploration: https://librecube.org/29 Servers

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28 Dec 2020
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30 Dec 2020
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4 Jan 2021
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13 Jan 2021
@artur.librecube:matrix.orgArtur ScholzThe linkpredict library has been brushed up a bit: https://gitlab.com/librecube/lib/python-linkpredict09:36:13
@artur.librecube:matrix.orgArtur ScholzHere an example link budget plot for ESA's Cluster-II satellite:09:36:47
@artur.librecube:matrix.orgArtur ScholzScreenshot_2021-01-13_10-34-49.png
Download Screenshot_2021-01-13_10-34-49.png
09:36:52
@artur.librecube:matrix.orgArtur ScholzDownload cluster link budget (two line element).html09:37:30
@azisi:matrix.orgazisi Artur Scholz: this tool in path loss calculation does it calculate Atmospheric Loss and Rainfall Loss? 09:41:53
@artur.librecube:matrix.orgArtur ScholzWe had previously implemented an ITU model for this, but it made the tool really really slow. (Maybe a better way would be to use look up tables). But for Cluster we use a static loss that includes margin.09:56:33
@artur.librecube:matrix.orgArtur ScholzIt is relatively easy to implement such model though. You subclass the MediumLoss ('medium' referring here to the propagation medium, eg. the atmosphere) and implement your method for returning time dependent losses. The tricky thing perhaps is that you may want to know the satellite's position for this. So either implement it there, or in another class that provides those results.10:00:03
17 Jan 2021
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19 Jan 2021
@shayanmajumder:matrix.orgshayanmajumder joined the room.11:42:38
@artur.librecube:matrix.orgArtur Scholz Hello shayanmajumder, welcome to this chat! And great job you did, decoding the Cluster-II frames. Could you please share the GNURadio and Python script? You could for example do a merge request: https://gitlab.com/artur-scholz/decode-cluster-frames 20:47:44
@artur.librecube:matrix.orgArtur ScholzAs GNURadio is quite heavy, do you think you could create a standalone Python script for the decoding?20:48:16
20 Jan 2021
@shayanmajumder:matrix.orgshayanmajumder
In reply to @artur.librecube:matrix.org
Hello shayanmajumder, welcome to this chat! And great job you did, decoding the Cluster-II frames. Could you please share the GNURadio and Python script? You could for example do a merge request: https://gitlab.com/artur-scholz/decode-cluster-frames
Sure I will do that ! I had written the python scripts in a notebook format(https://colab.research.google.com/drive/1jaX7Mr5ZsLQU9vVXb1bakKbnhqiAerxn?usp=sharing)
09:07:51
@shayanmajumder:matrix.orgshayanmajumderDo you want me to convert them into .py files as I had written them in this format for testing purposes.09:08:41
@shayanmajumder:matrix.orgshayanmajumder
In reply to @artur.librecube:matrix.org
As GNURadio is quite heavy, do you think you could create a standalone Python script for the decoding?
I have to look more on this I will let you know.
09:09:17
22 Jan 2021
@shayanmajumder:matrix.orgshayanmajumder Artur Scholz: please check the latest merge request have removed the gnu radio dependency. 03:55:56
@shayanmajumder:matrix.orgshayanmajumder set a profile picture.06:50:55
@artur.librecube:matrix.orgArtur Scholz Hi shayanmajumder , I have not tried it yet, but will try do test it later! 14:34:41
23 Jan 2021
@sawjan:matrix.orgsawjan
In reply to @juanjorojash:matrix.org
that looks good but it is not MPPT is MPPC which means that it doesn't have an algorithm to follow the maximum power point, instead it has a fixed voltage
juanjorojash: Look at this one! 6V to 80V input voltage range makes it interesting for 3U or larger https://www.analog.com/en/products/lt8491.html#product-overview
23:24:04
@sawjan:matrix.orgsawjanHigh Voltage Buck-Boost Battery Charge Controller with Maximum Power Point Tracking (MPPT) and I2C23:24:45
24 Jan 2021
@juanjorojash:matrix.orgjuanjorojashHi Jan, the minimum input of 6V requieres at least 3sXp configuration for the solar panels it seems it will be difficult to use this in a 1U 00:23:34

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