부산대학교 도서관

Currently, many radio systems are used for air traffic management (ATM). Secondary surveillance radar (SSR) and associated systems that operate at frequencies 1030/1090 MHz are one of the most important components of ATM. These systems exchange pulse signals between a transponder and an interrogator using random-access methods for channel sharing. Recently, using these 1030/1090 MHz systems in ATM are expected to increase as air traffic increases in density. For efficient and effective 1030/1090 MHz radio operations, the signal environment in this frequency band must be understood and managed. This study aims to report measurements of the 1030/1090 MHz signal environment, recorded during flights over Japan. The relation between the number of aircraft or terminals and the signal environment with multipath propagation and/or interference is discussed.