I worked on a civilian GPS system back in the days when Selective Availability was still enabled. (http://en.wikipedia.org/wiki/ Error_analysis_for_the_Global_Positioning_System#Selective_availability) In order to determine the well-known point from which to broadcast DGPS corrections, a receiver was placed at the DGPS broadcast point for over 24 hours. The well-known point was set as the average of the readings the receiver got over the 24 hours. We were able to achieve approximately one meter accuracy with this approach, but we were using much better antennas than are in the phones. However, the further you got from the DGPS location the worse the accuracy. I assume this was due to the receiver at the DGPS location computing its location from a different constellation of satellites than the receiver in the field.
On Sep 29, 11:38 am, lbendlin <[email protected]> wrote: > Fair enough. But in order to use the DGPS approach you first need to use > something (much) more precise than your Android GPS receiver to measure the > DGPS base station location. A bit of a catch-22. -- You received this message because you are subscribed to the Google Groups "Android Developers" 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-developers?hl=en
