This routine calculates the maximum acceptable e.i.r.p. of terrestrial transmitters that must be respected to protect the Radio Astronomy Service using Recommendations ITU-R P.620 and P.525 while for atmospheric attenuation Recommendation ITU-R P.676 is used. This routine can also be used to estimate the separation distance between the transmitter and the radio astronomy station for an aggregate of transmitting devices. In this calculations are done for different minimum distance values until the maximum tolerable e.i.r.p. is reached.
The calculation uses the geographic summation methodology. Since a generic solution is anticipated: no terrain model is included.
The protection criteria for Radio Astronomy are given in Recommendation ITU-R RA.769. The tolerable date loss to radio astronomy observations and percentage-of-time criteria resulting from degradation by interference for frequency bands allocated to the radio astronomy on a primary basis is given in Recommendation ITU-R RA.1513.