I know one of the engineers, and he told me that they don't try and get a higher accuracy signal, but a lower deviation of the signal. I forget the exact termin

I know one of the engineers, and he told me that they don't try and get a higher accuracy signal, but a lower deviation of the signal. I forget the exact terminology, but the FAA has a circle that is 99% confidence, and coherent was trying to make the circle smaller than the currently available technology.