<br><br><div class="gmail_quote">On Thu, Apr 3, 2008 at 8:55 PM, <<a href="mailto:david@lang.hm">david@lang.hm</a>> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="Ih2E3d">On Thu, 3 Apr 2008, Michail Bletsas wrote:<br>
<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Let's not forget that you need some fixed reference points.<br>
In commercial systems, the locations of the access points are well known.<br>
In ad-hoc networks the best that you can hope for is a topological map.<br>
</blockquote>
<br></div>
the assumption was that the measurements are being done from fixed points. either the school server antenna locations, or the known locations of specific assistant laptops.<br>
<br>
without known locations you can't do much.<br>
<br>
David Lang<div><div></div><div class="Wj3C7c"></div></div></blockquote><div><br>Suppose you have your initial fixed points with known locations (server antennas and any standalone repeaters). Wouldn't you be able to identify "temporarily" stationary points that, after deducing their locations, could be deemed additional "listening stations"? Once a node is identified as such, any additional measurements it provides can be deemed credible and then used to determine the locations of less stationary nodes. <br>
<br>As David said, some commercial solutions require calibration by walking a node around the premises. I think this has been shown to be fairly accurate for a single AP's coverage area without having to add additional APs to the network.<br>
</div></div><br>Most of the comments have been along the lines of using single measurements to identify distances of separation. I think a better solution would be to include the mesh's routing table, packet arrival times, etc. along with RSSI measurements. If you generate one or more likely maps from each and then average them out, I suspect you'd get a fairly accurate estimation of where everybody is. Coupled with preloaded measurements from around the premises, a viable solution seems likely. <br>
<br>Is the XS capable of installing/"pushing" applications onto XOs automatically? If so, that allows for a very easy way to let the XOs participate in the process without bothering users, as well as distributing some of the number-crunching to take make things easier for the XS app.<br>
<br>Am I displaying complete naivety here about everything involved or does any of this stuff make sense to you guys? <br><br>-Crawford<br>