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Re: [Discuss-gnuradio] Regarding the updating and extending gr-radar ide
From: |
Martin Braun |
Subject: |
Re: [Discuss-gnuradio] Regarding the updating and extending gr-radar idea for GSoc 2018 |
Date: |
Thu, 8 Mar 2018 12:54:16 -0800 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 |
On 03/05/2018 04:10 PM, suraj hanchinal wrote:
> Thanks for the response. I was mainly interested in passive radar and
> also was into the idea of passive WiFi radar. As I said I have been
> reading research papers like this one
> http://ieeexplore.ieee.org/document/6020778/ . This paper has a method
> of using WiFi AP for passive target detection. This could further be
> used for applications as well and the algorithms are also said to work
> for other types of signals as well. I am also looking into WiFi passive
> radar using symbol reconstruction as well for better results. What is
> your opinion on this?
I think I may have read this in past, but I can't access it now
(paywall). That said, it's a fun way to go forward.
-- M
> Thanking you,
> Suraj Hanchinal
>
> On Mon, Mar 5, 2018 at 11:44 PM, Martin Braun <address@hidden
> <mailto:address@hidden>> wrote:
>
> Suraj, (and going back to the ML),
>
> first question is: What are *you* interested in? We have suggested 4
> overarching topics (SAR, Passive Radar, Apps, Multi-antenna). You'd have
> to be *extremely* productive to get more then one or two done during
> GSoC.
>
> You've indicated interest in passive radar and multi-antenna, and
> specifically pointed out the idea of using Wifi signals (great project!)
> for passive radar. Frankly, if you can pull that off, that would cover
> both the passive radar side, and the apps side (because you could build
> something on top of your wifi passive radar to e.g. catch speeding cars,
> or maybe do something completely different.
>
> Thinking outside of the wifi signal topic for a moment, there's plenty
> of people who have done passive radar with GNU Radio, but ironically not
> with gr-radar. A simple cross-correlation approach based on any existing
> broadcast signal would be a good start, too. Plus, you can use wifi
> dongles for such an application. It would be nice to have out-of-the-box
> passive radar experiments ready to run provided in gr-radar.
> Another "downside" of the current codes is that for experiments, you
> need devices that have both native support for timed commands, high
> bandwidth, and Tx capabilities -- basically, USRPs. A passive radar
> example could also work with RTL SDR dongles. That would be a cheaper
> intro to the toolbox.
>
> Cheers,
> Martin
>
> On 03/05/2018 06:50 AM, suraj hanchinal wrote:
> > Thanks a lot for the response. I have read about the passive radar
> > signal processing as well as parts of your thesis on ofdm radar to
> > familiarise myself with the above mentioned technique. I have also
> > studied the entire code of gr- radar to familiarise myself with that. I
> > am also reading up on research papers for the same. I wanted to ask
> > about the scope of the implementation in the sense that what should the
> > extension to the toolbox contain. Please enlighten me on this.
> >
> > Thanking you,
> > Suraj Hanchinal
> >
> > On Mar 1, 2018 1:19 AM, "Martin Braun" <address@hidden
> <mailto:address@hidden>
> > <mailto:address@hidden <mailto:address@hidden>>>
> wrote:
> >
> > On 02/24/2018 05:34 AM, suraj hanchinal wrote:
> > > Hello Everyone,
> > > I am planning to apply for GSoc 2018. I was very interested
> and would
> > > love to work on the gr-radar toolbox. I was interested
> specifically in
> > > implementing passive-radar and multi-antenna support to
> gr-radar.
> > Since
> > > a passive radar system would need a multi-antenna support
> anyways, I
> > > think they could be implemented together. I have been
> reading some
> > > research papers regarding passive radars to get a better
> understanding
> > > and I think implementing a passive radar to use FM
> transmitters nearby
> > > to locate objects as a good starting point and then turn to
> using wifi
> > > access points in an area as the next step. I am currently
> developing a
> > > proper write-up as well for the same. I would kindly request
> you to
> > > point out any things I should know of or just general
> suggestions
> > on the
> > > subject. I would also kindly request the mentors Martin
> Braun and
> > Stefan
> > > Wansch to enlighten me on this.
> >
> > Suraj,
> >
> > thanks for your interest in GSoC and gr-radar! Passive radar would
> > indeed be a pretty nifty addition. It's probably easier to get
> better
> > results using more high-bandwidth signals with better
> cross-correlation
> > properties, such as terrestrial TV stations.
> >
> > Note that I assume that you have some familiarity with the signal
> > processing fundamentals of passive radar. That said, you can
> do a lot
> > better than cross-correlating when doing passive radar with OFDM
> > signals, but that's a little too much to lay out in a short
> email (in a
> > nutshell, you can recreate the original tx'd signal and use
> symbols as
> > samples in the time-frequency domain to generate range/Doppler
> diagrams
> > without having to worry about cross-correlation artefacts).
> >
> > Also go check out Juha Vierinen's work (e.g., this:
> >
>
> https://hackaday.com/2015/06/05/building-your-own-sdr-based-passive-radar-on-a-shoestring/
>
> <https://hackaday.com/2015/06/05/building-your-own-sdr-based-passive-radar-on-a-shoestring/>
> >
>
> <https://hackaday.com/2015/06/05/building-your-own-sdr-based-passive-radar-on-a-shoestring/
>
> <https://hackaday.com/2015/06/05/building-your-own-sdr-based-passive-radar-on-a-shoestring/>>,
> > an old blog post I googled real quick). And of course Jean-Michel's
> work
> > that Phil mentioned.
> >
> > -- M
> >
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