[GRASS-user] LOS, Fresnel Zones, Multi-Line wave propagtion and GHz communications

[Markus Neteler]

On Thu, Apr 17, 2008 at 12:05 PM, Peter Hopfgartner
<peter.hopfgartner at r3-gis.com> wrote:
> Dear GRASS community,
>
>  I would like to simulate the strength of a signal emitted from an antenna
> and received by a receiver.
>
>  As a first approach r.los gives a good start. Anyway, more accurate results
> could be  obtained by  taking obstruction in the first Fresnel Zone into
> account. Finally, having a way to calculate the impact on indirect
> paths/reflections, should lead to a reasonably accurate signal strength map.
>
>  Did anybody work on some of these issues, possibly in combination with
> GRASS? Is there a good starting point for the calculation of the obstruction
> within the first Fresnel Zone. And the reflections?

Hi Peter,

reading
  http://en.wikipedia.org/wiki/Fresnel_zone
I remembered
  Mapping Wi-Fi Network Range with GRASS, Kismet, and python
  http://casoilresource.lawr.ucdavis.edu/drupal/node/470

Could this be helpful?

Markus