On 13 September 2013 14:22, Colin Smale <colin.sm...@xs4all.nl> wrote: > Cm-level GPS accuracy is coming within our grasp... My attention was > recently drawn to this: > > http://www.kickstarter.com/projects/swiftnav/piksi-the-rtk-gps-receiver >
You need to operate in differential mode to get the full accuracy, which means you still need an accurately surveyed datum. I don't see that it will help with reflections. I also wonder if it will prompt the re-introduction of selective availability, as it gives some of the advantages of the higher chipping rates on the, encrypted, find mode GPS signal, and probably doesn't have the velocity and altitude caps normally applied to commercial receivers. I believe the military have the advantage that they can use the second frequency to help do large area ionosphere corrections. _______________________________________________ Talk-GB mailing list Talk-GB@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-gb
