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Radar Pulse Stream Comparison - RF Cafe Forums
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Daniel_T
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Post subject: Radar Pulse Stream Comparison
Posted: Wed Mar 16, 2011 5:40 am
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Joined: Tue Mar 15, 2011
2:32 pm Posts: 1 |
Hi all,
I am currently working on a project
with the aim to write a Matlab program to be able
to analyse ESM received data. I have both synthetic
and real data to play with, which has been de-interleavered
and has the following info: 1. Time of arrival
2. Frequency 3. Pulse Width 4. Bearing
5. Emitter ID 6. Stream ID 7. Confidence (1
or 0)
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
emitter. 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. I have already written
code to filter the data down and provide a user
interface for streams/certain emitters to be analysed.
Just wondered if any one had any ideas for
comparison methods - I've been told that a similar
technique is used in DNA matching?!?
Regards,
Dan.
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troy |
Post subject: Re: Radar Pulse Stream Comparison
Posted: Thu Apr 28, 2011 4:38 pm
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Captain |
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Joined: Mon Feb 25, 2008
4:53 pm Posts: 8 |
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 information?
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Posted 11/12/2012
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