On Jan 24, 2008, at 1:30 AM, atreau2k wrote:
> > Anyone have an idea about how to mathematically detect the signal > strength to determine approximate distance to the nearest network? > Free Space Loss = 20 * Log10 (frequency in MHz) + 20 * Log10 (Distance in Miles) + 36.6 The problem you have with trying to use signal strength, is that you would need to know the signal strength of the transmitter and antenna gain, you also have loss from other objects, and interference from other devices. Try using a 2.4GHz device behind a fish tank or next to a running microwave. > Senario... > > I walk into a large facility with numerous routers all serving me > Internet. I wish to determine my approximate distance to each > router. Then using math and most likely packet send and receive > times, I want to guesstimate the distance to router 1, router 2 > etc.. Very similar to cpt.. cell phone triangulation. > > oh.. doing this with a web browser rather than an app would be just > awesome. > > so.. any ideas? > The 802.11 protocol was not designed to function with DME capabilities. You would need access to some pretty low level features of the wireless radio and there is no method I know of to send a signal to an access point and have it send a return a packet in an exact known amount of time. Given the small indoor area you are asking about, you would need a high level of accuracy to make the distance measurements meaningful. If you want to do something similar to cell phone triangulation, then your best bet is to do what the cell guys do, map out the signal strengths at various points around the area and use that data to construct a map of where you are. Your map would need updating whenever an object in the area moved. There is definitely no way to do this from the web browser. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "iPhoneWebDev" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/iphonewebdev?hl=en -~----------~----~----~----~------~----~------~--~---
