Here's one for thought, if it is used on the amatuer bands, how will the ID
be done  for the station every (I think I remember it as 10 minutes)?  Will
there be a CW station ID every 10minutes?
Mike
----- Original Message -----
From: "Matt Bennett" <mjb@HAZMAT.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, August 06, 2001 1:54 PM
Subject: Re: [EE]: Amateur radar?


> "J.Feldhaar" wrote:
> >
> > Hi all,
> >
> > another tack on the issue: what about the bandwidth required for good
> > distance resolution, assuming a pulse or a chirp is used, considering
the
> > mandatory use of multi kilowatts of peak power needed for the 30 miles
> > range earlier mentioned in this thread...??
> >
> > I personally have considered doing just this and I have not found an
> > amateur frequency range where this would be permitted...even the 5 GHz
> > band
> >
> > Comments?
> >
> > Greets,
> > Jochen Feldhaar DH6FAZ
>
> Ummm... What's "good resolution?"
>
> From _Intoduction to Radar Systems_ by Merrill I. Skolnik- the error in
> the time delay of a pulse (using rising and falling edges of the pulse)
> can be written (Eq. 11.5):
>
> Rise time error=(t/(4BE/No))^(1/2), where B is the bandwidth, E is the
> signal energy, No is the noise power per unit bandwidth and t is the
> pulse width.
>
> The range error would be 1/2*time error*c) (1/2 since radar is 2-way,
> but that also means that your power recieved goes down as a factor of
> 1/r^4)
>
> A chirp would get you a greater effective power on the target-
> increasing E.
>
> As to peak power required and so forth, I direct the curious to chapter
> 2 of the same book, where the radar equation is discussed in some detail
> (50+ pages).
>
> That's your range resolution, but azimuth resolution is a factor of your
> antenna and range.  I'm particularly fascinated by synthetic aperture
> radar- while the range resolution is still a factor of system bandwidth,
> azimuth resolution is *independent* of range with a focused SAR.
> Depends on a moving radar (or target) and you can't make an image in
> "real time" but it is fascinating anyway.
>
> Matt Bennett
>
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