[time-nuts] Very Accurate Delta Time RF Pulse Measurements

Didier Juges shalimr9 at gmail.com
Mon Aug 1 08:57:58 EDT 2016


Have you looked at the blitzortung.org system?
There may be some ideas to glean from that


On July 28, 2016 6:12:54 PM CDT, Jerome Blaha <jblaha at polariswireless.com> wrote:
>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
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-- 
Sent from my Moto-X wireless tracker while I do other things.


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