A Computation of Radar SEP and CEP
R. S. Johnson, Stanley D. Cottrill, Peyton Z. Peebles · IEEE Transactions on Aerospace and Electronic Systems · 1969
Recently the concept of spherical error probable (SEP) has been gaining acceptance as a means of defining the error ellipsoid for radar accuracy in three dimensions. The corresponding quantity for a two-dimensional case is circular error probable (CEP). Both SEP and CEP are defined and a set of curves is given to determine their values for most radar situations.