The characteristics and action mechanisms of intentional interference sources were analyzed. Then, a fast detection method of intentional co-channel interference was proposed based on such technologies as real-time spectrum analysis, digital phosphor display, and co-channel signal direction-finding. Next, two classical intentional interference scenarios were reproduced, and interference sources were detected fast through the proposed method.

Due to the interference coexistence between IMT-2020 system and radio locating radar system in the 3 400 ∼3 600 MHz frequency band, based on the coexistence scenario of this frequency band, this paper sorts out the typical frequency parameters of radar and the key parameters of base station, and establishes a propagation model. The interference between IMT-2020 system and radar system in the same frequency band is analyzed by means of system modeling and Monte Carlo simulation. According to the interference threshold of the system, the interval distance required for the coexistence of the two systems is obtained, and the interference avoidance measures are proposed to realize the coexistence of the two systems.

Given the interference between public mobile communication system and S-band radars, an applicable interference analysis model was established, the typical frequency parameters of radar and the key parameters of the base station were sorted out, the radiation parameters of the mobile terminal (MT) were tested practically, and the interferences of the base station and MT to radar were calculated. Further, the Monte Carlo method was taken to simulate the system-level lumped interference of the communication system to radar, and an analysis was made on the influence of the communication system on the frequency of radar. The results revealed that the public mobile communication system had severe lumped interference with radar, which may affect radar frequency. Therefore, it is necessary to take measures to protect radar.