Interference Analysis of Anti Micro and Small Unmanned Aircraft Systems and Code Division Multiple Access Systems at Frequency Band 835–845 MHz

An anti micro and small unmanned aircraft system (AmsUAS) is a radio technology used for civil micro and small unmanned aircraft systems (msUASs) control. Along with blocking the communication link of the msUAS, the AmsUAS also interferes with other radio communication systems such as civil aviation and mobile communication systems. In this study, an analysis method based on the interference-to-noise ratio (INR) criterion is proposed and interference analysis is performed on AmsUAS and code division multiple access (CDMA) systems. First, to control msUASs, it is necessary to calculate the minimum transmit power of the AmsUAS in the corresponding frequency band according to the uplink and the radio wave propagation distance of the msUAS. Second, to avoid harmful interference to other radio systems (such as CDMA), the frequency and distance separation between the AmsUAS and CDMA radio systems should be calculated according to factors such as application scenarios, radio wave propagation distance, and working frequency band. Finally, a simulation analysis provides the transmit power, off-axis angle, frequency separation, and distance separation of the AmsUAS and CDMA systems in different environments.