"DARPA is investing in radically new technologies... including chip-scale self-calibrating gyroscopes, accelerometers and clocks" It seems they are trying to

"DARPA is investing in radically new technologies... including chip-scale self-calibrating gyroscopes, accelerometers and clocks" It seems they are trying to eliminate long term bias. More technical description of their approach here: http://scpnt.stanford.edu/pnt/PNT10/presentation_slides/15-PNT_Symposium_Shkel.pdf http://scpnt.stanford.edu/pnt/PNT10/presentation_slides/15-P...