Do you get the GPS location of the air plane? Or do you get it before? If it is not the radio or antenna, maybe the environment matters? I didn't do any experiments in a totally open area, so I don't know whether it works under that scenario. If we can decoding the signal in environment, I think it should be very useful.
Yaxiong 2014-05-03 21:54 GMT+08:00 Silverfox <alan.r.h...@gmail.com>: > I have had the type 24 message for a long time. However, the new reports > seem bogus to me as well. It is not the result of the radio or antenna as > far as I can determine. > > 73, > > Alan - W6ARH > > > > > > *From:* discuss-gnuradio-bounces+alan.r.hill=gmail....@gnu.org [mailto: > discuss-gnuradio-bounces+alan.r.hill=gmail....@gnu.org] *On Behalf Of *YAXIONG > XIE > *Sent:* Saturday, May 3, 2014 6:44 AM > *To:* discuss-gnuradio@gnu.org > *Subject:* [Discuss-gnuradio] About the decoding result of gr-air-modes > > > > Hi all, > > > > I install the gr-air modes. And the hardware I am using is USRP N210 > without GPSDO. The command I am using is the default command of the > modes_rx module. And after I run this module, I got the following Results: > > > > (-47 32.32056722) No handler for message type 24 from 739803 > > (-48 34.25826672) No handler for message type 24 from 207ee9 > > (-48 35.86728697) Type 5 (short surveillance ident reply) from a49b0c > with ident 1264 (SPI ALERT) > > (-48 35.87198622) No handler for message type 24 from a35558 > > (-50 35.95602397) No handler for message type 24 from 8b672a > > (-49 35.97354972) Type 4 (short surveillance altitude reply) from 6e0c4c > at 65200ft (AIRBORNE ALERT) > > (-48 36.32546122) Type 5 (short surveillance ident reply) from 69f33f > with ident 5514 (SPI) > > (-49 37.18337247) Type 0 (short A-A surveillance) from 608e19 at 120900ft > (No TCAS) (aircraft is on the ground) > > (-48 37.21837897) No handler for message type 24 from e80163 > > (-50 38.68267197) No handler for message type 24 from b3e6f2 > > (-48 39.26921197) Type 0 (short A-A surveillance) from 12ff05 at 2250ft > (speed 600-1200kt) (aircraft is on the ground) > > (-49 40.52049497) Type 5 (short surveillance ident reply) from 38e9a8 with > ident 3576 (SPI) > > (-48 40.56394397) Type 0 (short A-A surveillance) from cf63e4 at 8700ft > (Full TCAS resolution) (aircraft is on the ground) > > (-47 40.56904497) No handler for message type 24 from 5353ab > > (-48 41.08549722) No handler for message type 24 from b60846 > > DD(-48 52.18300072) Type 5 (short surveillance ident reply) from da22a7 > with ident 3450 (SPI) > > (-47 53.62936347) Type 5 (short surveillance ident reply) from 8c773 with > ident 3374 (GROUND ALERT) > > D(-49 56.62670697) Type 0 (short A-A surveillance) from fa024d at > 125800ft (speed 1200-2400kt) > > (-47 56.95657397) Type 5 (short surveillance ident reply) from 3b6a76 > with ident 5634 (aircraft is on the ground) > > (-47 57.34665522) No handler for message type 24 from f9ac8a > > D(-50 59.47285847) Type 5 (short surveillance ident reply) from 7d6227 > with ident 3510 (SPI ALERT) > > (-51 59.49907272) Type 0 (short A-A surveillance) from 581dfb at 76200ft > (No TCAS) (aircraft is on the ground) > > D(-48 61.03326422) No handler for message type 24 from a90fee > > (-48 61.18943772) Type 21 link capability report from 18049d: ACS: > 0xd0ccc, BCS: 0xfeae, ECS: 0xa7, continues 4 ident 1810 > > (-49 62.11700572) Type 4 (short surveillance altitude reply) from 62253 at > 17325ft (SPI ALERT) > > (-47 62.44659672) No handler for message type 24 from 27adc7 > > D(-49 64.96764872) No handler for message type 24 from e30901 > > (-50 64.98554547) Type 5 (short surveillance ident reply) from a39eee > with ident 7306 (SPI ALERT) > > (-47 65.04707547) No handler for message type 24 from 0ec82e > > (-49 65.10223472) Type 5 (short surveillance ident reply) from ca6477 with > ident 3034 (AIRBORNE ALERT) > > (-48 66.02713647) No handler for message type 24 from b4567c > > (-48 66.37042047) No handler for message type 24 from 21544d > > (-49 66.49397872) No handler for message type 24 from 759628 > > (-49 66.62760947) No handler for message type 24 from d79b77 > > (-48 67.58220572) Type 5 (short surveillance ident reply) from 98fb94 with > ident 3334 (AIRBORNE ALERT) > > (-49 68.06558797) No handler for message type 24 from 6d93b5 > > (-48 68.86033522) No handler for message type 24 from 4cc3fd > > > > This is not what I want and I don't think it is the correct decoding > result, is it right? > > > > I did this experiments in indoor environment, then I think maybe the > signal is too weak, then I move to the corridor and redo this and get > similar results. I can not get the position of the air plane. > > > > So my question is that, is it all about the environment? Is there any > other possible bugs or something I missed that cause the output I've > received? I am very curious because the corridor is quite close to the out > door environment. > > > > Thanks a lot. > > Yaxiong > > > > -- > > *Yaxiong Xie / **谢亚雄* > > > > School of Computer Engineering > > Nanyang Technological University, Singapore > -- *Yaxiong Xie / **谢亚雄* School of Computer Engineering Nanyang Technological University, Singapore
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