Posted 10/9/2017 11:51 (#6297137 - in reply to #6289231) Subject: RE: Low cost replacement Receiver for yield mapping
Illinois / Wisconsin
A 162 receiver should have the same accuracy as this receiver on WAAS. Since this is just for mapping, there will be no difference in the accuracy of the 162 compared to this receiver. The big differences could be with how weatherproof or shock-resistant each is.
CEP is circular error probability, which is called 'repeatable accuracy'. Basically, if you plot a point one year, there's a 50% chance you will be within 1.55 meters of it at any time in the future. This is because of the accuracy of WAAS (the SBAS system for North America) is at this level. (This is actually a 'bad' number to use, most Agricultural receivers have repeatable accuracy numbers based on much higher 95% or 99.7% intervals (normalized distribution probability, 2 or 3 sigma confidence intervals). This is why repeatable accuracy is claimed to be 3 meters by Trimble)
WAAS, having a 'pass-to-pass' accuracy of 6-8" is basically saying that you can come back to a recorded point after a few minutes (a 'pass') and be within 6-8" of this point. However, if you come back to this point after a much longer period of time, you have a 50% chance of being within 1.55 meters of that point.