Hello to all,
I am working on what approximates an active RADAR for the interrogation
of a temperature sensitive microwave resonator. For this project, I
will be using GNU Radio libraries and a USRP 1 device. In my research,
I have discovered some issues that might pertain to this project in
On Saturday 30 September 2006 00:04, John Ackermann N8UR wrote:
> But also realize that in addition to preventing physical damage to the
> receiver, you also need to deal with "desense" (as we old repeater
> builders call it) that results when the RX front end is subjected to a
> strong input. It
Lee, I'm not sure what power levels you're running, but if you need more
isolation than a single circulator can provide, you can always stack
'em. Then, you could also put a pair of clamping diodes at the receiver
input to protect it from any system failure.
But also realize that in addition
Jason and Daniel -
Thanks for the feedback. I'll look into PIN diodes. The reason I
wanted to use a circulator was because it doesn't require a switching
signal to be generated from the USRP. And, while generating such a
signal is possible, it is difficult (if not impossible?) to ensure it is
t
> We make MF & VHF systems and for some of our VHF systems we use a single
> set of antennas and a T/R switch (passive and active). However since our
> frequency of operation is 2-3 orders of magnitude lower it's probably all
> different...
The radar I worked on was a ~2.7GHz job. Since the recei
On Friday 29 September 2006 07:30, Jason Hecker wrote:
> > lot more about it, and looking for better parts, but I've learned to ask
> > the experts early ;) Any ideas?
>
> I used to write software for a radar. It used separate antennas for
I still do :)
> transmit and receive for several reasons
Hi
> I have zero experience building a system like this. I'll be thinking a
> lot more about it, and looking for better parts, but I've learned to ask
> the experts early ;) Any ideas?
I used to write software for a radar. It used separate antennas for transmit
and receive for several reasons t
My active radar code has been working for some time, but I'm just now
getting around to thinking about real-world tests. The difficulty I'm
facing at the moment is how to isolate the transmitter and receiver
while still providing decent power on target. I'm looking for
suggestions.
Right now, us
On Thu, 2006-06-15 at 02:12 +0200, Martin Dvh wrote:
> Eric Blossom wrote:
> > On Wed, Jun 14, 2006 at 02:00:27PM -0400, Lee Patton wrote:
> >
> >>Hi, folks -
> >>
> >>I'm trying to build an active pulsed radar using GR/USRP. Right now I am
> >>only concerned with the transmission and reception of
Martin Dvh wrote:
> If I correlate with different doppler shifts my spirals turn around but they
> keep being spirals.
> In this image I change the doppler shift in every frame
> http://www.olifantasia.com/projects/gnuradio/mdvh/passive_radar/passive_radar_time_is_time_x_arc_is_phasediff_length_is
Eric Blossom wrote:
> On Wed, Jun 14, 2006 at 02:00:27PM -0400, Lee Patton wrote:
>
>>Hi, folks -
>>
>>I'm trying to build an active pulsed radar using GR/USRP. Right now I am
>>only concerned with the transmission and reception of pulses. All radar
>>signal processing will happen offline. I kno
On Wed, Jun 14, 2006 at 02:00:27PM -0400, Lee Patton wrote:
> Hi, folks -
>
> I'm trying to build an active pulsed radar using GR/USRP. Right now I am
> only concerned with the transmission and reception of pulses. All radar
> signal processing will happen offline. I know Eric is working on
> pa
Hi, folks -
I'm trying to build an active pulsed radar using GR/USRP. Right now I am
only concerned with the transmission and reception of pulses. All radar
signal processing will happen offline. I know Eric is working on
passive radar. Has anyone tried active yet?
I have a start on the Tx and
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