Dam monitoring systems use DGPS, one receiver on the wall, the other nearby.
Without a local reference station, atmospheric and ionospheric disturbances would totally overwhelm the effect they are trying to measure.
This [1] covers it quite well.
Without a local reference station, atmospheric and ionospheric disturbances would totally overwhelm the effect they are trying to measure.
This [1] covers it quite well.
It was in mid 90s, but I can guarantee you that I sat next to a math PhD guy who worked exactly on what I described, including the dam deployment. Single receiver, 3mm precison from 3-4 hours of data, no DGPS. This wasn't in the US though.