[time-nuts] GPS 18 behavior

Scott McGrath scmcgrath at gmail.com
Tue Jul 23 07:51:17 EDT 2013

Thanks Jim

Was not aware that <10 Ghz signals could penetrate so deeply.  I work for a enterprise wifi company on the RF side and one of our key challenges is signal attenuation/distortion by building materials

Any pointers to papers on this?

I did know that /tvb was using seismic sensors but moles are small you would need a high resolution seismic grid to accurately place them

 Woodchucks are much larger and they also tunnel and undermine things so easier to find with seismic sensor

Sent from my iPhone

On Jul 23, 2013, at 12:03 AM, Jim Lux <jimlux at earthlink.net> wrote:

> On 7/22/13 10:39 AM, Scott McGrath wrote:
>> Moles are a bit small it would probably work better for woodchucks.  who are in the process of undermining all lawns in neighborhood now.
>> In a more serious vein most ground penetrating radar is low frequency and I was not aware that THz waves could penetrate ground more than a few CM
> I believe tvb was using seismic sensors.
> low microwave (<10 GHz) penetrates just fine to tens of meters. I wouldn't want to run a comm link at any sort of data rate, but for 1 Hz bandwidth and coherent detection, it works just fine.
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