|
From: | Bruhtesfa Ebrahim |
Subject: | Re: [Discuss-gnuradio] Any tutorials (documentation) about gr-radar-mono |
Date: | Tue, 11 Nov 2008 09:48:06 +0100 |
Just my 2 cents.
On Mon, 2008-11-10 at 20:14 +0100, Bruhtesfa Ebrahim wrote:
> Hi Johnathan,
>
> Thank you so much for the advise that you gave me ! ! !
> Could you also look at the following description and give me your
> comment.? - Thanks
>
> Ya! I am looking to detect human motion at a distance of minimum 1
> meter and maximum 10 meter.
> I have one USRP and two XCVR2450 Trancievers(operating freq. 2.45GHz),
> which I will be using one of them as transmitter and the
> other as reciever. So, I have two possible ways of implemetation.
>
> 1) As pulse doppler radar = here to get a minimum distance of 1
> meter, the usrp should transmit a pulse of width 5 nanosec, then
> should stop and the reciever should start to recieve, then to measure
> a velocity as high as 3m/sec, I can use PRF of 100. Here the problem
> is as you said the USRP can not generate such a short pulse of 5
> nanosec, plus it can not switch between transmitter and reciever so
> fast.
>
> 2) As CW radar = here my idea is to transmit a CW from one shell
> script and recieve the reflected data at the same time in another
> shell script. Here the problem is the isolation between the transmit
> and recieve paths. The data I recieve will not be just a reflected
> data but also signal from the transmitter.
>
> This means both of the implementation ways have problem.
> So, what do you suggest?
I would suggest using sound in stead of radio waves.
The lower speed of soundwaves (around 300 m/sec) means the timings go
down with a factor 1000000 and you could do very precise short-range
radar (actually sonar).
You could still use the USRP. Just use amplifiers and ultrasonic
transducers in stead of antenna's.
Good luck,
Martin
> _______________________________________________
> And which one do you recommend me from your previous experience on the
> USRP?
>
>
> Also Mr. Lee Pathon, the Author of "GNU based Software Defined
> Radar ", I know you worked on such stuff , could you give me some
> comment based on your work? - Thanks
>
> Bruhtesfa
>
>
>
>
>
> On Mon, Nov 10, 2008 at 4:45 PM, Johnathan Corgan
> <address@hidden> wrote:
> On Mon, 2008-11-10 at 16:39 +0100, Bruhtesfa Ebrahim wrote:
>
> > Is there any tutorial (documentation) that explains in
> detail
> > gr_radar_mono and other gnu radio packages?
> > I look on GNU radio 3.0svn documentation but it has no
> details. is
> > there any other that has more details?
>
>
> There is a README inside the directory that explains the
> command-line
> parameters.
>
> But I'll warn you ahead of time that, based on a prior email
> where you
> said you were looking at targets 10 meters away, that this
> software
> won't work for you.
>
> Without going in to detail, the minimum range is about 200m,
> based on
> transmitting a long enough chirp and the time it takes to
> switch from TX
> to RX.
>
> Just FYI, however, this software was able to image targets 1.5
> km away,
> using an RFX2400, a 3W PA, and a horn antenna.
>
> -Johnathan
>
>
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