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

Scott Stobbe scott.j.stobbe at gmail.com
Thu Jul 28 22:03:52 EDT 2016

Taking a look for it also turned up a recent time-nuts thread


On Thursday, 28 July 2016, Scott Stobbe <scott.j.stobbe at gmail.com> wrote:

> There was a pic app note on alternate uses for the cap sense block a while
> back, not sure it that it will push you into the ps.
> On Thursday, 28 July 2016, Jerome Blaha <jblaha at polariswireless.com
> <javascript:_e(%7B%7D,'cvml','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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