QPSK demodulator not detecting signal #62
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bug
Something isn't working
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That's definitely not supposed to happen. Thanks |
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the gif shows the best signal I can acheive |
expor2t.mp4 |
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jtop system stats seem ok when running satdump |
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Log from this morning Satdump Meteor M2 attempt: |
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Sorry for the late answer. I've had similar reports that lead to this fix a92e595, which I think also affected LRPT as it pretty much always go through the resampler... |
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Hello when I receive the Elektro L3 it seemed to be the same problem. The RS is red and the BER is jumped from green and red VID_20211111152944.mp4 |
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That is definitely not the same issue, the BPSK demod locked just fine. Also, are you running the latest APK from Github CI? |
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@Aang23 I am noticing also during my build stage: So perhaps I will try to build Volk from source and see what happens. Do I need to place volk_config into satdump directory or no? My Jetson Nano device is Arm A57 but I do not see anything in: volk/cmake/Toolchains/ for the Jetson ARM A57 CPU ugh, when compiling volk: |
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About this error when building, that is expected if you are running Volk <=1.3. I do this test to provide a fallback implementation if Volk does not provide it. No, volk_config should be left where it is. That's weird when compiling Volk though... May be an ARM-specific issue, but I'd advise opening up an issue in Volk. Not a SatDump issue by any means. |
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Ah ok :) I compiled #62 (comment) fix - Just waiting for Meteor Pass in hour or so. |
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Good luck with that pass! Actually I may as well do it too, just gotta take the QFH out. |
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No success. Demodulator was still the same as above. |
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Testing this morning again but using Macbook Pro: Still no demodulation of Meteor-M2 satdumpmac1.mp4Differences in the Log between Jetson Nano & Macbook are Macbook has Volk Spiral, perhaps because has volk version 2.4 Log: |
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@Aang23 as an update: So perhaps the satdump live processing demodulator is not successful just yet? |
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@benb0jangles sorry for the late answer. It's possible something is going wrong in the demodulator, but others and I have been unable to reproduce the issue. Are you able to provide a baseband sample? Really the only way I may be able to figure it out with this kind of issue. |
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@Aang23 I have recorded baseband using satdump + these settings: The .i16 file is over 3GB in size so I must wait a couple of hours before I can complete the upload to gdrive Here are screen recordings during baseband recording export1.mp4export.mp4
During Demodulation SNR and Peak SNR are at 0 for too long. |
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Here is the baseband recording: |
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@benb0jangles well, that settles it. |
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So I guess I will try LRPT with 3MSPS on Airspy or use RTL SDR for LRPT, then Airspy for HRPT |
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LRPT works very well on the Airspy-R2 at the 2.5M sample rate & should do well on the Mini at 3M. If the computer can handle the higher sample rates for those devices, 10M or 6M will work great, too! |
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@Aang23 so this morning i tried LRPT using 3M with aIrspy mini and result is improvement. The demodulator is now functioning and SYNC is acheived. Signal is not as strong as using SDR# or GQRX or similar software, but I think still capable. For this morning pass I had to contend with NOAA15 and POCSAG interference. I use a 137mhz Bandpass filter, but I think I will remove it tomorrow because the filter lowers the db by 30%. I am hoping stronger signal will create better image, this mornings image was terrible but it was the first one using Satdump live so also success :) export2.mp4I like that it is working on 5v Jetson Nano 2GB it is amazing now to think that full live LRPT - Signal - Demodulation - Decoding - Processing is functional on cheap ARM device. My future goals will of course to push and see if it can also do Live HRPT at 6M once I finish making my DIY parabolic antenna, and the rain stops. Tomorrow I expect result to be much better. Good luck with development, I think you have powerful software in Satdump, can I suggest future goal of having satdump as a plugin for SDR++? |
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Samples Using Satdump (Pass Sat 4th Dec 2021 07:50) terrible weather, incoming arctic storm: I think using LRPT suite on Windows gives best images, but for Linux Jetson Satdump is good progress especially for a complete Live LRPT processing suite.
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Recorded using SDR++ on JEtson Nano with Meteor Plugin, then SAtdump offline Processing of 100MB .s file, producing RGB-221 image, then brightened because winter early morning is dark. |
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Nice results! I guess I can close this now! |
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Hi Aang I am trying to use Live Decoding on Satdump for Meteor-M2 however I am unable to get good signal for the demodulator to start working. If I use SDR++ Meteor demodulator on the same machine it works just fine. In satdump, the demoduator only gets weak signal when satellite overhead.
Setup:
Airspy mini
QFH
Jetson Nano with Ubuntu 18.04
I try adjusting gain, enabling or disabling DC Lock, Adjusting the scale sliders, etc but I am unable to find success.
Best wishes
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