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Sylvain AZARIAN sylvain.azarian at gmail.comHi , just one comment : the interrogation is periodic and stable.. the request is transmitted by a rotating antenna turning at constant speed. If you can get the direct path to the interrogation system, you may estimate the round-trip time and then when the interrogation pulse is sent sylvain 2014-02-17 16:46 GMT+01:00 Allan Healy <allan.healy121 at gmail.com>: > Hi Pete > > Thanks for the reply. Yeah I can see the MODE C transmissions with the > rtl_adsb alright but I don't know how to see the interrogation > transmissions from an SSR. Like you said there are many decoders available > for MODE S. Hopefully my supervisor will understand the gravitas of the > project and will accept MODE S as a suitable solution. Still I will try do > some more research. If I am successful I will provide my solution to this > forum. Thanks again. > > Allan > > On 17 Feb 2014, at 15:31, Pete Zaitcev <zaitcev at kotori.zaitcev.us> wrote: > > > On Mon, 17 Feb 2014 14:57:44 +0000 > > Allan Healy <allan.healy121 at gmail.com> wrote: > > > >> My name is Allan an I am currently working on my final year project > >> for college. The idea is to create a radar system that interprets > >> MODE C interrogation signals and replies by aircraft and SSR and > >> with this information determine where these airplanes are in your > vicinity. > > > > I never heard of anyone being able to do that so far. Mode S is easy > > and there's any number of 1090 Extended Squitter receivers and decoders > > out there, but Mode C relies on the illumination by the radar to > > trigger the transmission. Since you cannot know where the radar > > is pointing and when the impulse started (and sometimes not where > > the radar is located), you cannot link Mode C squitter with the > particular > > primary target. > > > > You can receive Mode C with rtl_adsb and have a look at 56-bit packets, > > but they are completely useless for an independent ground station. > > > > Some people nowadays play with a concept of building a something > > like interferometer from 3 or 4 receivers, but nobody has succeeded > > thus far, as far as I know. > > > > -- Pete > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/osmocom-sdr/attachments/20140217/8a4dca7c/attachment.htm>