Hello again ,

May be you are right . A passive radar can do the job. I saw at
internet , some italian researchers use tv satellite source and single
lnb receiver and they create an radar image of buildings with this
passive radar. Their results are terrible and neither look like 2 d
cheapest camera image nor a most basic radar image.

And I want a few centimeters res dem image.
I think I must satellite transmitters as source.
Where can I learn the satellite routes and their frequencies ?
What kind of receiver and antenna success ?
I found ku band satellite receivers with lnb for 120 usd. Do they work
for me ?
They are the highest frequecy receivers I could find cheap.
Are there higher frequency cheap receivers or schematics at internet.
I could not find.
And they must be compatible with satellites.
Do gunnplexer receivers work ? They are really cheap .
Awaiting your ideas .

Best ,

Mustafa Umut Sarac

Istanbul



**THE-RFI-EMI-GUY** yazdi:
If you think of it, man is illuminating the earth with RF "photons"
continually. It should be possible to image all types of structures in
3D with the proper receivers.

Mike Young wrote:

Not to drag it off topic, but I'm confused about what looks like
ground shadows in Sandia's SAR images. For example, the tower shadow
in http://www.sandia.gov/radar/movies/solar.mov continually points
toward the "viewer". Is this reflected radiation from the tower off
the ground?? Really weird false lighting effect if that's what it is.
Also, ground shadows under trees in other images make them look like
false color satellite photos.

I think if you're going to do it, large synthetic apertures would be
most interesting.

Mike.

"mustafa umut sarac" wrote in message
ups.com...

I want to take high res mountain and city pictures with homebrew radar.
Some use passive radars and produce synthetic aperture radar images.
Passive radars use gsm , vhf , uhf , sw , fm , satellite transmitters .
But I am not sure about the quality of resulting image.
- Some italian researchers did it but I saw the images and I did not
like.-
If it will not not satisfy my need , I will want to build a transmitter
and receiver.
Do I need to use a gunnplexer ? Or is there any new transmitters at
market ?
What is your idea for building a sar ?




--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

"Follow The Money" ;-P