The object of RF technology in aerospace

Two aspects of radio frequency technology in aviation and space systems engineering are considered, i.e., interference phenomena and antenna design. Multipath problems and the dimensioning of a seeking antenna for an antiaircraft missile are cited as examples. Multipath effects cause fading in communication channels and angle errors in tracking radars. Measured results of fading in a satellite communication link and of the image effect observed with a radar tracking a target flying over water are presented. Computation of possible angle errors in a monopulse radar is demonstrated. The design of a seeking antenna with respect to system requirements for an antiaircraft missile is illustrated. Relations between antenna parameters and missile flight parameters are derived from proportional navigation conditions.