[NLRS] Aircraft Scatter

[Ted Gustafson]

I just spoke to Bill about this. I have one of the SDR dongles coming. My
intention is to use it and some software called PDW for a system to verify
to operation of a POCSAG paging system and alert me to system failure.

In my digging I ran across this.

http://www.rtl-sdr.com/adsb-aircraft-radar-with-rtl-sdr/

Something that may be of use in what your guys are talking about.


On Sat, Dec 14, 2013 at 10:54 AM, Dr. Gerald N. Johnson
<geraldj at netins.net>wrote:

>
>
> Some claim that the scatter is less the aircraft than the plume of
> supposed ionized gasses behind it made of combustion products and perhaps
> skin friction electrification.
>
> I just opened DUBUS 4/2013 and it has an article on a European aircraft
> scatter program. I've not yet read it.
>
> I think lots of wind upsets the normal density gradient refraction as do
> layers with different humidities and temperatures. Those winds also mix the
> more normal morning temperature inversions from radiation cooling at the
> surface, and that radiant night time cooling doesn't happen with lots of
> clouds. And when the air is already -20, the radiant cooling probably isn't
> effective at getting the surface cooler.
>
> What we have is the capability of finding more about the boundary layer
> atmosphere than the weather researchers know, just by microwave propagation
> over a collection of paths.
>
> 73, Jerry, K0CQ
>
>
> On 12/14/2013 10:43 AM, Bill Davis wrote:
>
>>
>>
>>     The dongle based aircraft tracking thread is an interesting one,
>> There are a number of aircraft tracking sites on the net, but they have in
>> some cases a time delayed plot of the aircraft's position. I have at times
>> tried to correlate the AC scatter enhancement on Gary W0GHZ's  signals with
>> limited success.
>>
>>     On Gary's skeds it is VERY UNUSUAL to NOT see aircraft "effects" on
>> his signals. It seems to be more common on 1296 and then 902. I wouldn't
>> characterize the effects be enhancement, for often there is as much
>> "nulling" of the signal as anything else.
>>
>>    Recently with the advent of the -20deg temps and low humidity, we have
>> lost our 10GHz path from time to time. My memory may fail me, but I don't
>> recall prior to the last couple of weeks seeing obvious AC enhancement on
>> 10GHz. There has been 3 occasions over the last 2 weeks that Gary has been
>> observed briefly 20db or more above the noise floor via AC scatter. In each
>> case the enhancement did not seem to have obvious doppler. From that I
>> assume the aircraft's path must have been at right angles to path? The
>> enhancement as a result been VERY brief, 5sec or so.
>>
>>    It will be interesting to look for more favorable aircraft position to
>> increase the signal enhancement period. There are a few flights that look
>> promising. Real time tracking would be certainly more helpful than the
>> current services.
>>
>>    After Christmas, I will investigate the real time tracking, looks
>> interesting and CHEAP :-)
>>
>>   Merry Christmas and Happy New Year
>>
>>
>> 73  Bill  K0AWU
>> ______________________________________________________________
>> NLRS mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/nlrs
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:NLRS at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>>
>>
> ______________________________________________________________
> NLRS mailing list
> Home: http://mailman.qth.net/mailman/listinfo/nlrs
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:NLRS at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>