Recommendation ITU-R R618 presents propagation data and step-by-step methods for predicting the performance of earth-space radio systems operating in frequency bands between about 1 GHz and 55 GHz and applicable to average annual percentage times in the range 0.001 per cent to 50 per cent. This recommendation deals only with effects relating to the wanted signal. Interference aspects are covered in Recommendations ITU-R P.452, P.619 and P.1412. There is insufficient space within this chapter to present all the details of the prediction methods given in Recommendation ITU-R P.618 and, therefore, a broad description will be given together with references to related ITU documents.

Inspec keywords: radiofrequency interference; ionospheric electromagnetic wave propagation; space communication links

Other keywords: propagation data; earth-space propagation; performance prediction; earth-space radio systems; interference aspects; recommendation ITU-R P.618; average annual percentage times; frequency bands; ITU documents; step-by-step methods

Subjects: Space communication systems; Radiowave propagation