Interference analysis of navigation satellite signals using the Tianma 65-m radio telescope

This article mainly discusses the compatibility of satellite navigation and radio astronomy services as well as the simulation and measurement analysis based on the Tianma 65-m radio telescope's response to the interference signals from a navigation satellite. First, the frequency division of satellite navigation and radio astronomy services are introduced in the CN frequency band. Then, the sensitivity and interference thresholds of radio astronomy observation are estimated. This paper mainly describes the antenna pattern, interference simulation calculation method, and the performance advantages of the Tianma 65-m radio telescope. The solution methods are introduced in detail. Finally, the measurement results show that the noise temperature generated by the sidelobe response of the Tianma 65-m radio telescope to the interference signals from the navigation satellite is <1/10 of the antenna system noise temperature. Furthermore, the differences between the simulation and measurement are thoroughly examined.