Thank you for the AGPS link. I agree that Cell ID is the right granularity for a lot of useful solutions. And appreciate the 10cm precision instrument size.
I have a friend with a Garmin wrist watch sized GPS that resolves to about 3 ft by looking at the data from lunch run departures and returns on the same sidewalk. That is good enough to have an item beacon. The accelerometer can theoretically simulate position data as you walk around in a store. If you calibrate your cart on a yellow arrow at the entrance... three radios in the corners of the store ceiling could give you 'particle cell' tower position data. Maybe at a low enough frequency to not get blocked by buildings. So I guess the idea is: An item beacon can be implemented in several ways, 1) an expensive, 2+ dollar, accelerometer that integrates twice to get accumulated displacement (if mounted to a cart that might actually work), and 2) event or location based radio system on the smaller than micro scale that help a market organizer provide guidance to customers at trade shows or other marketplaces. I don’t' know if you have ever struggled to find a booth at SuperComm or NextComm or whatever it is. They could get more money for their back alley booths if folks could choose an itinerary or list of destinations from the web and let micro radios in the corner locate and android phones guide them to booth by booth by presenting merchant beacons in a logical order. The calibration spot would be for promotional purposed mostly. Does anyone have an accelerometer to GPS utility for indoor mapping yet? Is the i-phone accelerometer good enough to do this? On Jul 8, 9:22 am, whitemice <[EMAIL PROTECTED]> wrote: > Android will be restricted by the limitations of the hardware on which > it runs. Right now 10cm is achievable with a device the size of a > toolbox, which can average out multiple input signals over time. > > You are more likely to find an implementation of “Assisted GPS” on an > Android device:http://en.wikipedia.org/wiki/Assisted_GPS > > To get an idea of performance, have a go on a Nokia N95 - You will > find that: > - It doesn’t work indoors (shooting down the in-store use case). > - Cold start times can be excessively long. > - Detrimental to power consumption (if in constant use) > > Performance on handsets is still inferior to dedicated GPS devices. > Don’t expect massive improvements in the near future as Mores law > doesn’t apply to mobile devices. > > I blogged this in more detail here (half way down the > post):http://blog.zedray.com/2008/05/16/android-developer-challenge-critique/ --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Discuss" 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/android-discuss?hl=en -~----------~----~----~----~------~----~------~--~---
