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bistromath / gr-air-modes

Gnuradio Mode-S/ADS-B radio
This project implements a Mode S receiver for the Gnuradio software-defined radio project. It is designed to receive Mode S transmissions from aircraft and decode them to a human-readable format, including ADS-B information messages such as position and a
GNU General Public License v3.0
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all junk message #94

Closed hawkingyy closed 7 years ago

hawkingyy commented 7 years ago

I am using RTL2832U on Kubuntu16.04. When I am running gr-air-modes with gain 25, 2M/s sample rates, I could decode so many message without position, callsign. In the begining, I thought may be I should take more time, however, as time goes on, I could find few useful message. I have tried different gain, sample rates, but resulted the same. MSG,6,0,44,583092,144,2016/11/01,12:42:45.777,2016/11/01,12:42:45.777,,,,,,,,1340,0,0,0,0 MSG,7,0,45,E46C5E,145,2016/11/01,12:42:45.980,2016/11/01,12:42:45.980,,21300,,,,,,,,,,0 MSG,7,0,46,82E5F0,146,2016/11/01,12:42:47.294,2016/11/01,12:42:47.294,,95700,,,,,,,,,,0 MSG,7,0,47,30D269,147,2016/11/01,12:42:47.901,2016/11/01,12:42:47.901,,61400,,,,,,,,,,0 MSG,6,0,48,B02692,148,2016/11/01,12:42:48.206,2016/11/01,12:42:48.206,,,,,,,,0014,0,0,0,0 MSG,5,0,49,0631D0,149,2016/11/01,12:42:51.437,2016/11/01,12:42:51.437,,14800,,,,,,,1,0,0,1 MSG,6,0,50,1CB7A9,150,2016/11/01,12:42:51.841,2016/11/01,12:42:51.841,,,,,,,,2032,0,0,1, MSG,6,0,51,BC8AAE,151,2016/11/01,12:42:51.842,2016/11/01,12:42:51.842,,,,,,,,4056,0,0,0,0 MSG,7,0,52,2CEB2C,152,2016/11/01,12:42:52.348,2016/11/01,12:42:52.348,,15100,,,,,,,,,,1 MSG,7,0,53,CDDC29,153,2016/11/01,12:42:52.450,2016/11/01,12:42:52.450,,-1300,,,,,,,,,,0 MSG,5,0,54,B571A4,154,2016/11/01,12:42:52.853,2016/11/01,12:42:52.853,,31200,,,,,,,0,0,0,1 MSG,5,0,55,66BF2D,155,2016/11/01,12:42:53.258,2016/11/01,12:42:53.258,,29300,,,,,,,0,0,0,1 MSG,6,0,56,0D4003,156,2016/11/01,12:42:53.360,2016/11/01,12:42:53.360,,,,,,,,0300,0,0,0,0 MSG,5,0,57,DCDC33,157,2016/11/01,12:42:54.371,2016/11/01,12:42:54.371,,111100,,,,,,,1,0,1, MSG,7,0,59,4FC65E,159,2016/11/01,12:42:56.190,2016/11/01,12:42:56.190,,-1300,,,,,,,,,,0 MSG,5,0,60,5CD3DF,160,2016/11/01,12:42:56.291,2016/11/01,12:42:56.291,,36600,,,,,,,0,0,0,0 MSG,6,0,62,8AE599,162,2016/11/01,12:43:00.129,2016/11/01,12:43:00.129,,,,,,,,0260,0,0,0,1 MSG,6,0,63,7027A3,163,2016/11/01,12:43:00.836,2016/11/01,12:43:00.836,,,,,,,,1002,1,0,0,0 MSG,5,0,64,E94F71,164,2016/11/01,12:43:00.836,2016/11/01,12:43:00.836,,4700,,,,,,,0,0,0,0 MSG,7,0,65,90608E,165,2016/11/01,12:43:01.047,2016/11/01,12:43:01.047,,15000,,,,,,,,,,1 MSG,5,0,68,5969B7,168,2016/11/01,12:43:03.273,2016/11/01,12:43:03.273,,8900,,,,,,,1,0,1, MSG,7,0,69,6FDDF8,169,2016/11/01,12:43:04.487,2016/11/01,12:43:04.487,,40975,,,,,,,,,,1 MSG,7,0,70,195E4C,170,2016/11/01,12:43:04.487,2016/11/01,12:43:04.487,,57900,,,,,,,,,,1 MSG,7,0,71,DF14F1,171,2016/11/01,12:43:05.393,2016/11/01,12:43:05.393,,4700,,,,,,,,,,0 MSG,7,0,72,A200A2,172,2016/11/01,12:43:05.999,2016/11/01,12:43:05.999,,47800,,,,,,,,,,1

Using the same RTL2832U in windows with rtl1090.exe, everything goes alright. I don't know why? MSG,7,111,11111,7807BD,111111,2016/11/01,12:44:57.000,2016/11/01,12:44:57.000,,24175,,,,,,,,,0 ID,,111,11111,7807BD,111111,2016/11/01,12:44:57.000,2016/11/01,12:44:57.000,CSC8295 MSG,1,111,11111,7807BD,111111,2016/11/01,12:44:57.000,2016/11/01,12:44:57.000,CSC8295,,,,,,,,,,, MSG,4,111,11111,780C73,111111,2016/11/01,12:44:57.000,2016/11/01,12:44:57.000,,,440.0,358.0,,,0,,,,, MSG,7,111,11111,780D95,111111,2016/11/01,12:44:57.000,2016/11/01,12:44:57.000,,34100,,,,,,,,,0 MSG,8,111,11111,780D95,111111,2016/11/01,12:44:57.000,2016/11/01,12:44:57.000,,,,,,,,,,,,0 MSG,7,111,11111,780D95,111111,2016/11/01,12:44:57.000,2016/11/01,12:44:57.000,,34100,,,,,,,,,0 MSG,3,111,11111,780D95,111111,2016/11/01,12:44:57.000,2016/11/01,12:44:57.000,,34100,,,30.57546324,104.4208190,,,,,,0 ID,,111,11111,780D95,111111,2016/11/01,12:44:57.000,2016/11/01,12:44:57.000,CES2206 MSG,1,111,11111,780D95,111111,2016/11/01,12:44:57.000,2016/11/01,12:44:57.000,CES2206,,,,,,,,,,, MSG,4,111,11111,780D95,111111,2016/11/01,12:44:57.000,2016/11/01,12:44:57.000,,,461.0,5.0,,,0,,,,, MSG,7,111,11111,7807BD,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,24275,,,,,,,,,0 MSG,5,111,11111,7807BD,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,24250,,,,,,,,,,0 MSG,8,111,11111,7807BD,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,,,,,,,,,,,0 MSG,7,111,11111,7807BD,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,24225,,,,,,,,,0 MSG,3,111,11111,7807BD,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,24275,,,31.43914691,104.4244445,,,,,,0 MSG,4,111,11111,7807BD,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,,411.0,358.0,,,1536,,,,, MSG,5,111,11111,7807BD,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,24250,,,,,,,,,,0 MSG,5,111,11111,780DFA,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,10975,,,,,,,,,,0 MSG,4,111,11111,780DFA,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,,342.0,266.0,,,-576,,,,, MSG,5,111,11111,780DFA,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,10975,,,,,,,,,,0 MSG,7,111,11111,780C73,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,34100,,,,,,,,,0 MSG,5,111,11111,780C73,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,34100,,,,,,,,,,0 MSG,8,111,11111,780C73,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,,,,,,,,,,,0 MSG,7,111,11111,780D95,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,34100,,,,,,,,,0 MSG,5,111,11111,780D95,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,34100,,,,,,,,,,0 MSG,8,111,11111,780D95,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,,,,,,,,,,,0 MSG,3,111,11111,780D95,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,34100,,,30.57760464,104.4210388,,,,,,0 MSG,4,111,11111,780D95,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,,461.0,5.0,,,0,,,,, MSG,5,111,11111,780D95,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,34100,,,,,,,,,,0 MSG,5,111,11111,780D95,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,34100,,,,,,,,,,0

Besides, the select box "Show ADS-B-equipped aircraft" only can not be selected.

hawkingyy commented 7 years ago

you can even see negative height in messages decoded by gr-air-modes

bistromath commented 7 years ago

gr-air-modes uses a relatively sensitive threshold to pick out preambles. Use the -T parameters to set a higher threshold.

On Mon, Oct 31, 2016, 9:47 PM hawkingyy notifications@github.com wrote:

I am using RTL2832U on Kubuntu16.04. When I am running gr-air-modes with gain 25, 2M/s sample rates, I could decode so many message without position, callsign. In the begining, I thought may be I should take more time, however, as time goes on, I could find few useful message. I have tried different gain, sample rates, but resulted the same. MSG,6,0,44,583092,144,2016/11/01,12:42:45.777,2016/11/01,12:42:45.777,,,,,,,,1340,0,0,0,0 MSG,7,0,45,E46C5E,145,2016/11/01,12:42:45.980,2016/11/01,12:42:45.980,,21300,,,,,,,,,,0 MSG,7,0,46,82E5F0,146,2016/11/01,12:42:47.294,2016/11/01,12:42:47.294,,95700,,,,,,,,,,0 MSG,7,0,47,30D269,147,2016/11/01,12:42:47.901,2016/11/01,12:42:47.901,,61400,,,,,,,,,,0 MSG,6,0,48,B02692,148,2016/11/01,12:42:48.206,2016/11/01,12:42:48.206,,,,,,,,0014,0,0,0,0 MSG,5,0,49,0631D0,149,2016/11/01,12:42:51.437,2016/11/01,12:42:51.437,,14800,,,,,,,1,0,0,1 MSG,6,0,50,1CB7A9,150,2016/11/01,12:42:51.841,2016/11/01,12:42:51.841,,,,,,,,2032,0,0,1, MSG,6,0,51,BC8AAE,151,2016/11/01,12:42:51.842,2016/11/01,12:42:51.842,,,,,,,,4056,0,0,0,0 MSG,7,0,52,2CEB2C,152,2016/11/01,12:42:52.348,2016/11/01,12:42:52.348,,15100,,,,,,,,,,1 MSG,7,0,53,CDDC29,153,2016/11/01,12:42:52.450,2016/11/01,12:42:52.450,,-1300,,,,,,,,,,0 MSG,5,0,54,B571A4,154,2016/11/01,12:42:52.853,2016/11/01,12:42:52.853,,31200,,,,,,,0,0,0,1 MSG,5,0,55,66BF2D,155,2016/11/01,12:42:53.258,2016/11/01,12:42:53.258,,29300,,,,,,,0,0,0,1 MSG,6,0,56,0D4003,156,2016/11/01,12:42:53.360,2016/11/01,12:42:53.360,,,,,,,,0300,0,0,0,0 MSG,5,0,57,DCDC33,157,2016/11/01,12:42:54.371,2016/11/01,12:42:54.371,,111100,,,,,,,1,0,1, MSG,7,0,59,4FC65E,159,2016/11/01,12:42:56.190,2016/11/01,12:42:56.190,,-1300,,,,,,,,,,0 MSG,5,0,60,5CD3DF,160,2016/11/01,12:42:56.291,2016/11/01,12:42:56.291,,36600,,,,,,,0,0,0,0 MSG,6,0,62,8AE599,162,2016/11/01,12:43:00.129,2016/11/01,12:43:00.129,,,,,,,,0260,0,0,0,1 MSG,6,0,63,7027A3,163,2016/11/01,12:43:00.836,2016/11/01,12:43:00.836,,,,,,,,1002,1,0,0,0 MSG,5,0,64,E94F71,164,2016/11/01,12:43:00.836,2016/11/01,12:43:00.836,,4700,,,,,,,0,0,0,0 MSG,7,0,65,90608E,165,2016/11/01,12:43:01.047,2016/11/01,12:43:01.047,,15000,,,,,,,,,,1 MSG,5,0,68,5969B7,168,2016/11/01,12:43:03.273,2016/11/01,12:43:03.273,,8900,,,,,,,1,0,1, MSG,7,0,69,6FDDF8,169,2016/11/01,12:43:04.487,2016/11/01,12:43:04.487,,40975,,,,,,,,,,1 MSG,7,0,70,195E4C,170,2016/11/01,12:43:04.487,2016/11/01,12:43:04.487,,57900,,,,,,,,,,1 MSG,7,0,71,DF14F1,171,2016/11/01,12:43:05.393,2016/11/01,12:43:05.393,,4700,,,,,,,,,,0 MSG,7,0,72,A200A2,172,2016/11/01,12:43:05.999,2016/11/01,12:43:05.999,,47800,,,,,,,,,,1

Using the same RTL2832U in windows with rtl1090.exe, everything goes alright. I don't know why? MSG,7,111,11111,7807BD,111111,2016/11/01,12:44:57.000,2016/11/01,12:44:57.000,,24175,,,,,,,,,0 ID,,111,11111,7807BD,111111,2016/11/01,12:44:57.000,2016/11/01,12:44:57.000,CSC8295 MSG,1,111,11111,7807BD,111111,2016/11/01,12:44:57.000,2016/11/01,12:44:57.000,CSC8295,,,,,,,,,,, MSG,4,111,11111,780C73,111111,2016/11/01,12:44:57.000,2016/11/01,12:44:57.000,,,440.0,358.0,,,0,,,,, MSG,7,111,11111,780D95,111111,2016/11/01,12:44:57.000,2016/11/01,12:44:57.000,,34100,,,,,,,,,0 MSG,8,111,11111,780D95,111111,2016/11/01,12:44:57.000,2016/11/01,12:44:57.000,,,,,,,,,,,,0 MSG,7,111,11111,780D95,111111,2016/11/01,12:44:57.000,2016/11/01,12:44:57.000,,34100,,,,,,,,,0 MSG,3,111,11111,780D95,111111,2016/11/01,12:44:57.000,2016/11/01,12:44:57.000,,34100,,,30.57546324,104.4208190,,,,,,0 ID,,111,11111,780D95,111111,2016/11/01,12:44:57.000,2016/11/01,12:44:57.000,CES2206 MSG,1,111,11111,780D95,111111,2016/11/01,12:44:57.000,2016/11/01,12:44:57.000,CES2206,,,,,,,,,,, MSG,4,111,11111,780D95,111111,2016/11/01,12:44:57.000,2016/11/01,12:44:57.000,,,461.0,5.0,,,0,,,,, MSG,7,111,11111,7807BD,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,24275,,,,,,,,,0 MSG,5,111,11111,7807BD,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,24250,,,,,,,,,,0 MSG,8,111,11111,7807BD,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,,,,,,,,,,,0 MSG,7,111,11111,7807BD,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,24225,,,,,,,,,0 MSG,3,111,11111,7807BD,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,24275,,,31.43914691,104.4244445,,,,,,0 MSG,4,111,11111,7807BD,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,,411.0,358.0,,,1536,,,,, MSG,5,111,11111,7807BD,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,24250,,,,,,,,,,0 MSG,5,111,11111,780DFA,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,10975,,,,,,,,,,0 MSG,4,111,11111,780DFA,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,,342.0,266.0,,,-576,,,,, MSG,5,111,11111,780DFA,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,10975,,,,,,,,,,0 MSG,7,111,11111,780C73,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,34100,,,,,,,,,0 MSG,5,111,11111,780C73,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,34100,,,,,,,,,,0 MSG,8,111,11111,780C73,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,,,,,,,,,,,0 MSG,7,111,11111,780D95,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,34100,,,,,,,,,0 MSG,5,111,11111,780D95,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,34100,,,,,,,,,,0 MSG,8,111,11111,780D95,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,,,,,,,,,,,0 MSG,3,111,11111,780D95,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,34100,,,30.57760464,104.4210388,,,,,,0 MSG,4,111,11111,780D95,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,,461.0,5.0,,,0,,,,, MSG,5,111,11111,780D95,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,34100,,,,,,,,,,0 MSG,5,111,11111,780D95,111111,2016/11/01,12:44:59.000,2016/11/01,12:44:59.000,,34100,,,,,,,,,,0 Besides, the select box "Show ADS-B-equipped aircraft" only can not be selected.

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hawkingyy commented 7 years ago

@bistromath I have tried to set threshold to 10, then I got fewer junk messages, but still can not find useful message contain position and callsign. In windows, the threshold of rtl1090.exe is about -75dB. In real ADS-B receiver, the threshold is about -90dB. I don't know why we should take 10dB in gr-air-modes. Besides, when I take off the antenna，and use default threshold, I can still receive lots of messages, but that can not happen when I use rtl1090.exe in windows.

bistromath commented 7 years ago

The threshold is defined as the minimum preamble energy over the noise floor.

On Mon, Oct 31, 2016, 10:30 PM hawkingyy notifications@github.com wrote:

@bistromath https://github.com/bistromath I have tried to set threshold to 10, then I got fewer junk messages, but still can not find useful message contain position and callsign. In windows, the threshold of rtl1090.exe is about -75dB. In real ADS-B receiver, the threshold is about -90dB. I don't know why we should take 10dB in gr-air-modes. Besides, when I take off the antenna，and use default threshold, I can still receive lots of messages, but that can not happen when I use rtl1090.exe in windows.

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hawkingyy commented 7 years ago

@bistromath In these so many messages, I can not find the same HexIdent(Aircraft Mode S hexadecimal code, Field 5). That means no flight report ADS-B message twice or more, but that can not happen.

hawkingyy commented 7 years ago

where is wrong?

hawkingyy commented 7 years ago

without antenna, it can still receive so many message, I think there is something wrong with the drive of RTL2832U.

coolcow commented 7 years ago

I confirm the same problem with my hackrf one !

Some negative altitudes, no coordinates, disabled "Show ADS-B-equipped aircraft" checkbox. I have a strong signal and receive 200/300 messages/s, but it seems that something is going wrong while decoding.

I can reproduce the problem on a pentoo livecd (64bit).

bistromath commented 7 years ago

Try using the DC block option. HackRF has a pretty huge DC offset.

On Mon, Nov 14, 2016, 7:11 AM Jean-Michel Ruiz notifications@github.com wrote:

I confirm the same problem with my hackrf one !

Some negative altitudes, no coordinates, disabled "Show ADS-B-equipped aircraft" checkbox. I have a strong signal and receive 200/300 messages/s, but it seems that something is going wrong while decoding.

I can reproduce the problem on a pentoo livecd (64bit).

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coolcow commented 7 years ago

DC Block option doesn't fix the problem.

bistromath commented 7 years ago

Ok. What you're receiving are spurious replies that happen to pass CRC. It's not a problem in decoding, it's a noise problem. Try increasing the decoder threshold until you don't see anything when the antenna is disconnected. Then back off the threshold a little until you very maybe 5 or 6 false replies per minute. Then try it with the antenna.

If that doesn't do it you might have strong local or internal interference at or near 1090MHz. Take a look at the received spectrum with osmocom_fft. 1090MHz, 8Msps.

On Mon, Nov 14, 2016, 8:01 AM Jean-Michel Ruiz notifications@github.com wrote:

DC Block option doesn't fix the problem.

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hawkingyy commented 7 years ago

@bistromath, When I am using modes_gui, from Live Data, I can also see junk message, but the program goes alright at visible aircraft. How do you filter useful message from large numbers of junk message?