Analysis of ground transmitter interference range for GPS L1 signals in the ground test-bed environment of a navigation satellite system

To minimise the problems associated with the development of navigation satellite systems, the authors need to verify the suitability of the system and operation technology by constructing a ground test-bed in advance. When operating a ground test-bed, they must take extra care to prevent the ground transmission signal from interfering with very-low-power satellite signals received within the service area. Therefore, in this study, they first explain the concepts necessary to analyse the interference level between ground transmission signals and satellite signals, and then discuss the simulation results of the analysis of the interrelation between the ground transmitter power output and the interference range for Global Positioning System (GPS) L1 signals in the ground test-bed environment. The results confirmed that, as the ground transmitter power output increases, the maximum interference range for GPS L1 signals increases. Moreover, considering a ground test-bed environment where six transmitters with the same transmit power were arranged at equal distances, they conclude that, as the altitudes and distances of the transmitters increase, the service area becomes wider under certain conditions.