Annex 1  Aggregate protection criterion determination
 1     Definition of epfd
 2     Maximum aggregate epfd (all RNSS systems) to protect the ARNS
        2.1     Comparison between the impact of CW interference type of signal and RNSS type of interference signal on DME/TACAN on-board receivers
                  2.1.1     Susceptibility of DME receivers from interference by RNSS signals (spread spectrum signals)
                  2.1.2     CW RNSS measurement results
        2.2     Circular polarization isolation achieved by the DME antenna
        2.3     Apportionment of the DME maximum allowable aggregate interference level to RNSS