Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would
be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate
that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views.
It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if
you would like to post something on RF Cafe's
page, please do.
Below are all of the forum threads, including all
the responses to the original posts.
Post subject: Radar Pulse Stream
Posted: Wed Mar 16, 2011 5:40 am
Joined: Tue Mar 15,
2011 2:32 pm
I am currently working on a
project with the aim to write a Matlab program
to be able to analyse ESM received data.
have both synthetic and real data to play with,
which has been de-interleavered and has the
1. Time of arrival
3. Pulse Width
6. Stream ID
7. Confidence (1
So I am basically number crunching
in software, with no consideration to hardware.
The tricky part comes in the form of missing
pulses or gaps in the stream.
I can assume
the PRI of pulses by looking at one stream and
calculating the median between TOA.
I have to find a
way to compare fragments of streams together to
determine whether they are in fact from the same
I know of ways to fill the
gaps with null data then use various techniques
such as Discrete Fourier to 'estimate', but my
objective is to compare fragments.
already written code to filter the data down and
provide a user interface for streams/certain
emitters to be analysed.
wondered if any one had any ideas for comparison
methods - I've been told that a similar
technique is used in DNA matching?!?
Post subject: Re: Radar Pulse Stream
Posted: Thu Apr 28, 2011 4:38 pm
Joined: Mon Feb 25,
2008 4:53 pm
It's been a while since I worked on a radar
project, but at the time (1990s) we were doing
encoded pulse spreading specifically to prevent
signature ID. It was sort of a mixture of DSSS
and FHSS. It would be statistically impossible
to relate successive pulses more than a few PRTs
apart (in the case of long range interrogation)
unless you had the emitter's vector identified.
At that point, why do you need any more