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

Vlad time at patoka.org
Fri Jul 29 09:55:08 EDT 2016

May be some more accurate alternative to AD8302 could do that. AD8302 
could measure Gain/Loss and Phase up to 2.7 GHz. I using one in my 
project and its doing its job right (I think).

On 2016-07-28 19:12, Jerome Blaha 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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