Hi Jerome, This may or may not be of any help, but have you considered using several RTL-SDR devices running at the same time? You'd need to use a common clock, and probably a number of other enhancements. But, if you could pull it off, you'd have a wideband RDF type of device. You'd probably need to include GPS location as part of your datastream and do a lot of offline post-processing. Rather than using the time domain, though, it would probably be easier to put the antennas in a shadow from each other and use the amplitude domain for your post-processing.
Bob ----------------------------------------------------------------- AE6RV.com GFS GPSDO list: groups.yahoo.com/neo/groups/GFS-GPSDOs/info -------- Original Message -------- > Hi Guys, > > This is a little outside of time-nuts scope, but not by much. I'm interested > in finding the time between two rising edges above a set threshold with > preferably nS or high ps timing accuracy. Can this be simply done with a few > programmed Microchip PICs or with a good short term OCXO clock? The issue I > see is that a 10Mhz timing reference with 1 cycle difference in time yields > 100ns resolution, which is far too large, so maybe a PIC can solve this. > > This weekend project would be a multi-element antenna array, each with a > super-fast response log peak power detector fed into several PICs for time of > arrival. Whenever a nearby high energy RF pulse is detected, the time of > arrival between two antenna elements and hence the direction toward the TX > could be roughly computed. Some typical log peak detectors have an 8ns input > pulse response time, so I'm hoping that rise times are similar between > multiple detectors, negating the delayed response. > > There are time of arrival/AoA systems out there with synthetic doppler, > phased arrays, correlative interferometers, and phase comparators, but it > would be interesting to accomplish super wideband AoA timing on two rising > pulses with relatively cheap parts. > > Thanks, > > -Jerome > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
